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      10-26-2021, 11:39 AM   #23
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Quote:
Originally Posted by ZM2 View Post
Thanks johnung

It is confusing. For instance, in the MultiMap Stage 2+ notes that you posted above, why does it have the note that adding more E85 than an E30 mix will not result in more power b/c the OEM fuel pump can't flow enough, when the MultiMap requires an upgraded HPFP?!

What's also confusing to me is if MultiMap Stage 2+ map only contains the Stg 2+ E30 map and the Racegas map, how do I instead set the car up to go between the Stg 2+ E30 map and the Stg 2 93 map, in case I'm somewhere where there's no E85 or Racegas around?

An then of course is the other ultimate question is if you run E40, E50, E60, E85, etc., vs E30, is the map actually providing more boost/timing based on the ethanol sensor? Seems like that's the whole point of this effort, but I haven't seen logs confirming that.

I believe I remember detroitm2 messing with all this before going Ecutek, but I'm not sure.
Lots of good discussion here i will just add a few things. AFAIK, you can't mix stages on the multimap, right? So you cant do a stage 2 tune in one slot and a stage 2+ tune in another slot. That means even if you have the flexfuel sensor to adjust for varying ethanol on the fly, you will always be on the same stage. Whether or not this means the boost target remains the same i want to see in the logs. I am very curious to see if the tune scales boost with E% or just timing and fueling.

Quote:
Originally Posted by johnung View Post
Yeah, I don't know why more guys don't upgrade their TMAP sensors to 3.5bar to avoid any issues with boost spikes above what the 2.5bar TMAP can handle.

Someone I was reading reminded that bar is a fluid measurement that can vary depending on ambient conditions. I vaguely remember this from HS Physics. So when you hear guys quote that a tune's boost target is Xpsi and the 2.5bar TMAP is Ypsi, it's not always that cut and dry.

When you are playing around with tunes that aren't just very basic it doesn't hurt to upgrade the inexpensive TMAP sensor in the charge pipe so you aren't anywhere near its limit. Just take that variable out of the equation.

I also upgraded the TMAP on the intake manifold because I couldn't think of a good reason not to. And it's a configuration choice right in BootMod3.
To expand a little bit on what you were getting at, the thing is that the MAP sensor are absolute pressure sensors, meaning they measure total pressure: atmospheric + pressure in your CP. The DME reports this in the log as gauge pressure, which basically subtracts out atmospheric pressure so its just reporting your boost or vacuum. So the boost pressure at which a 2.5bar MAP sensor maxes out depends on your atmospheric pressure. Unless you have exceptionally low DA your probably not going to have a atmospheric pressure above 1.01 bar or about 14.7 psi, but there are lots of cases when you have lower than that when at altitude. So in reality the max boost the 2.5bar can read is about 1.5bar, but it's always a function of your atmospheric pressure.
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      10-26-2021, 11:47 AM   #24
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Quote:
Originally Posted by thejeremyman9 View Post

Lots of good discussion here i will just add a few things. AFAIK, you can't mix stages on the multimap, right? So you cant do a stage 2 tune in one slot and a stage 2+ tune in another slot. That means even if you have the flexfuel sensor to adjust for varying ethanol on the fly, you will always be on the same stage. Whether or not this means the boost target remains the same i want to see in the logs. I am very curious to see if the tune scales boost with E% or just timing and fueling.

.
I'm curious as well to see if it does adjust boost and timing. (Base map stage 2 and compensates to go up to stage 2+)
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      10-26-2021, 01:15 PM   #25
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the 2+ map will NOT scale boost up at all with more E. it's capped for people who have not upgraded the map sensor.

these maps can only scale timing. would be nice to know if it will scale up the timing or not. however I bet it doesnt.
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      10-26-2021, 01:22 PM   #26
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Quote:
Originally Posted by Phantom10R View Post
the 2+ map will NOT scale boost up at all with more E. it's capped for people who have not upgraded the map sensor.

these maps can only scale timing. would be nice to know if it will scale up the timing or not. however I bet it doesnt.
I dont think the 2+ map will increase boost based on flex fuel because its already maxing stock turbo, MAP sensor aside. They could in theory have logic in the tune that changes how it scales based on whether or not you have the upgraded MAP sensor enabled, but given turbo limits, its unlikely anyways. Although technically the 2+ map is made to work with upgraded turbo anyways. The proof will be in the logs.

The question remains as to whether or not the stage 2 map will scale boost with flex fuel... in theory it should, because a higher E% should be able to run both a higher boost and more timing than ACN 91 map, but since it is a stage 2 map that is technically designed for stock HPFP, it would need some logic in the tune to account for whether or not you have the HPFP box checked.

My guess is that the stage 2 map will not increase boost up to stage 2+ map levels based on having the HPFP box checked and flex fuel enabled. But we will need to see the logs.
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      10-28-2021, 01:31 AM   #27
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Quote:
Originally Posted by johnung View Post
After the FlexFuel required hardware is installed, a BootMod3 MultiMap tune must be flashed. A base map is chosen, I presume that it is supposed to match the base fuel being used in the tank before E85 is added.

So that might be say one of these:
1) Stage2 91
2) Stage2 93
3) E30

Assume that E50 is placed in the tank and the CANBus sensor tells the ECU that it's fuel is E50. Since FlexFuel algorithms automatically scale the tune up to use E50, then are all three of these tunes essentially identical? Or does the fact that the three started as different tunes effect their performance with E50? Thanks!

Car/Mods: F30 335ix N55 EWG FBO with Dorch2, LPFP upgrade, Zeitronix CANBus sensor, 3.5bar TMAPs.
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      10-28-2021, 01:40 AM   #28
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Quote:
Originally Posted by -Eidos View Post
Quote:
Originally Posted by johnung View Post
After the FlexFuel required hardware is installed, a BootMod3 MultiMap tune must be flashed. A base map is chosen, I presume that it is supposed to match the base fuel being used in the tank before E85 is added.

So that might be say one of these:
1) Stage2 91
2) Stage2 93
3) E30

Assume that E50 is placed in the tank and the CANBus sensor tells the ECU that it's fuel is E50. Since FlexFuel algorithms automatically scale the tune up to use E50, then are all three of these tunes essentially identical? Or does the fact that the three started as different tunes effect their performance with E50? Thanks!

Car/Mods: F30 335ix N55 EWG FBO with Dorch2, LPFP upgrade, Zeitronix CANBus sensor, 3.5bar TMAPs.
Welcome to the flex fuel club! It's a very convenient life
Wow, you are running some heavy duty stuff
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      10-28-2021, 10:35 AM   #29
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Quote:
Originally Posted by johnung View Post
Quote:
Originally Posted by -Eidos View Post
Quote:
Originally Posted by johnung View Post
After the FlexFuel required hardware is installed, a BootMod3 MultiMap tune must be flashed. A base map is chosen, I presume that it is supposed to match the base fuel being used in the tank before E85 is added.

So that might be say one of these:
1) Stage2 91
2) Stage2 93
3) E30

Assume that E50 is placed in the tank and the CANBus sensor tells the ECU that it's fuel is E50. Since FlexFuel algorithms automatically scale the tune up to use E50, then are all three of these tunes essentially identical? Or does the fact that the three started as different tunes effect their performance with E50? Thanks!

Car/Mods: F30 335ix N55 EWG FBO with Dorch2, LPFP upgrade, Zeitronix CANBus sensor, 3.5bar TMAPs.
Welcome to the flex fuel club! It's a very convenient life
Wow, you are running some heavy duty stuff
Thanks! I think you're asking the right questions and the community will benefit a lot from it.
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Full E85 DI-Only 717WHP Flex Fuel tuned by BendCalibration (ECUTek) | Built by SD Garage
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      11-03-2021, 05:56 PM   #30
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Hey guys, this post is not pure Multimap related, but it touches on a lot of discussion points we're having in the thread, and is another Stg 2+ E30 OTS data point to compare against once we have more Multimap logs/data.

I got the TTE460 on and logged a few pulls. My car: Stock intake, Wagner Evo3 IC, MST V2 turbo inlet, HJS 300-cell DP, Dorch Stage 1 HPFP, 3.5bar TMAP, Stage 2+ E30 5.9 OTS map, E50 fuel.

Subjective impressions are pretty close to what I thought it'd be: no spool lag, a little quicker than my Dinan turbo down low, but pulls strong to redline instead of falling flat. Exactly what I've been wanting.

As for numbers, I'll hit my local Dynojet in a couple weeks and I'm thinking we'll see 460-470whp? I only did one quick draggy today which was a 7.4s 100-200, but it was just too downhill to be valid (-1.2deg). So, will work on that--the roads around here aren't very flat or straight, so tough to nail one.

As for the log, below are my quick comments. Happy to hear anything you all are seeing, as well: https://www.bootmod3.net/log?id=6182...90c61b8e962967

Engine Temps: Nice cool day. Coolant barely cracked 205F, Oil 230F.
IATs: Typical IAT behavior for the Evo3--temps drop/stay flat in gears 3 & 4, 1-2F increase in gear 5, max 19F above ambient under load, max 24F above ambient under load on back-to-back 3-4-5 pulls.
Boost Target vs Actual: Tracked pretty close thru the RPMs. A couple low RPM deviations from tip in and wheel spin. My Dinan would consistently be 0.5-1.0psi under target throughout the rev range and float pretty erratically. The TTE460 pretty much stays on target until 6.5-7k RPM where it only drops 0.5psi below target.
HPFP Target vs Actual: Getting a little dip to 2500psi when starting the pull but comes back to target and holds thru the rest of the gears/RPMs. No real concern, just started to find the limit of the Dorch Stg 1 HPFP on E50 at this power level.
Timing: Looking pretty good! Just some low end deviations from wheel spin and too quick spool up with DSC being off.
Knock: None. Good octane level.
MAF/RAF: Max'ed out, as usual.
STFT: Look to be in a better range vs when I had the Dinan turbo. Same exact tune...
WGDC: Used to average 90% with the Dinan, now 85% with the TTE.

Anyways, she's pulling strong while still having instant torque and pulling to redline. My build is to be able to hold this power level on a hot summer track day. We shall see!

Last edited by ZM2; 11-03-2021 at 10:27 PM..
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      11-03-2021, 06:43 PM   #31
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Quote:
Originally Posted by ZM2 View Post

As for the log, below are my quick comments. Happy to hear anything you all are seeing, as well: https://www.bootmod3.net/log?id=6182...90c61b8e962967
Link to the log didnt seem to work, its truncated as if it was copied from another post (need to grab full URL or it copies "...")
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      11-03-2021, 06:45 PM   #32
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Originally Posted by thejeremyman9 View Post
Link to the log didnt seem to work, its truncated as if it was copied from another post (need to grab full URL or it copies "...")
My bad, fixing now!
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      11-05-2021, 01:05 PM   #33
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So, I pinged Halim and he was extremely pleased with the log. He kinda doesn't want to throw more at it and I can understand why--good power, clean timing, and we're not stressing the turbo at all which will be handy in the summer and on track.

He did say the Stg 2+ Multimap will increase timing further with E60-85, but he wasn't clear if there's a timing difference b/n the Stg 2+ E30 OTS and the Stg 2+ Multimap in the E30-50 range.

Definitely interested in what you find out johnung !
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      11-05-2021, 04:03 PM   #34
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Quote:
Originally Posted by ZM2 View Post
So, I pinged Halim and he was extremely pleased with the log. He kinda doesn't want to throw more at it and I can understand why--good power, clean timing, and we're not stressing the turbo at all which will be handy in the summer and on track.

He did say the Stg 2+ Multimap will increase timing further with E60-85, but he wasn't clear if there's a timing difference b/n the Stg 2+ E30 OTS and the Stg 2+ Multimap in the E30-50 range.

Definitely interested in what you find out johnung !
That's good news on your log. I just picked up my car from the shop- fixing some PPE issues this week. I'll get some logs this weekend.
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      11-05-2021, 06:51 PM   #35
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Originally Posted by ZM2 View Post
My bad, fixing now!
Finally took a quick look and zoomed in on one multigear pull in the log. Looks very clean indeed and the WGDC number look quite good compared to stock turbo. Are you running any kind of active cooling flash option?
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      11-05-2021, 06:58 PM   #36
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Quote:
Originally Posted by thejeremyman9 View Post
Finally took a quick look and zoomed in on one multigear pull in the log. Looks very clean indeed and the WGDC number look quite good compared to stock turbo. Are you running any kind of active cooling flash option?
The “Max Cool” BM3 feature that has lower coolant and oil temp targets is disabled at the moment. I do turn that on at the track during summer, tho.

I do have a larger CSF main radiator, oil cooler, DCT cooler, do88 larger aux radiator, and the Evo3 IC to try to keep things cool via hardware. Also hoping the TTE460 vs Dinan turbo helps with temps. Lastly, running Motul 300V dropped my oil (and coolant bc of the exchanger) temps 10-15F.

We also tried to install the first M2 N55 turbofold blanket from Heatshield Products last week, but everything is too tight around the turbo on my car for it to fit. Maybe it would fit other N55’s. We did wrap the downpipe with Armor insulation, no idea if it’s doing anything.

You can read about these things and my whole cooling saga here: https://f87.bimmerpost.com/forums/sh....php?t=1525790 I’ll update the thread this weekend about being the alpha tester for the turbofold blanket.

Last edited by ZM2; 11-06-2021 at 09:15 AM..
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      11-06-2021, 11:48 PM   #37
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Quote:
Originally Posted by ZM2 View Post
So, I pinged Halim and he was extremely pleased with the log. He kinda doesn't want to throw more at it and I can understand why--good power, clean timing, and we're not stressing the turbo at all which will be handy in the summer and on track.

He did say the Stg 2+ Multimap will increase timing further with E60-85, but he wasn't clear if there's a timing difference b/n the Stg 2+ E30 OTS and the Stg 2+ Multimap in the E30-50 range.

Definitely interested in what you find out johnung !
I just took a whole bunch of logs with E50 in the fuel tank. I did the MultiMap FlexFuel Stage2 91ACN, 91, and 93 tunes and MultiMap FlexFuel Stage2+ E30 tune and regular Stage2+ E30 tune.

Below are two that you were interested in comparing:

Stage2+ E30 w E50 in tank

https://www.bootmod3.net/log?id=6187...0b430f4af99634


MultiMap FlexFuel Stage2+ E30 w E50 in tank

https://www.bootmod3.net/log?id=6187...90c6283fe0a9a2

Hope this helps!
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      11-07-2021, 08:08 AM   #38
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Quote:
Originally Posted by johnung View Post
I just took a whole bunch of logs with E50 in the fuel tank. I did the MultiMap FlexFuel Stage2 91ACN, 91, and 93 tunes and MultiMap FlexFuel Stage2+ E30 tune and regular Stage2+ E30 tune.

Below are two that you were interested in comparing:

Stage2+ E30 w E50 in tank

https://www.bootmod3.net/log?id=6187...0b430f4af99634


MultiMap FlexFuel Stage2+ E30 w E50 in tank

https://www.bootmod3.net/log?id=6187...90c6283fe0a9a2

Hope this helps!
Awesome, thanks!

First, comparing your Stage 2+ E30 log to mine (our IATs and engine temps are in a similar range), it's interesting that you're hitting 14.0 max timing and I'm 12.5. However, you begin to not meet boost target above 5K RPM and are 5psi below target at redline. That must just be the flow restriction on your F30's turbo & manifold, but it looks like the map is compensating by increasing timing with the lower actual boost levels? IDK.

As for the difference bn Stg 2+ E30 and the Multimap, you hit max timing of 15.5 with a similar deviation in boost target above 5K. With the ethanol sensor and flex blend factor in play with the Multimap, things like STFT's are being managed differently and it looks like you're making more power.

But, how does the Stg 2+ Multimap feel comparing to the Stg 2+ E30 OTS to you?
And, how do both maps feel in general to you above 5k RPM when your actual boost is dropping below target? Quicker to shift at 6K RPM?

Lastly, some guys report that burble settings are lost b/n Map 1 and the other selectable maps, when switching between them. Is that also the case when doing flexfuel, or do burble settings stay intact as ethanol levels and the map scale up and down?

Last edited by ZM2; 11-07-2021 at 08:19 AM..
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      11-07-2021, 10:25 AM   #39
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Quote:
Originally Posted by ZM2 View Post
Quote:
Originally Posted by johnung View Post
I just took a whole bunch of logs with E50 in the fuel tank. I did the MultiMap FlexFuel Stage2 91ACN, 91, and 93 tunes and MultiMap FlexFuel Stage2+ E30 tune and regular Stage2+ E30 tune.

Below are two that you were interested in comparing:

Stage2+ E30 w E50 in tank

https://www.bootmod3.net/log?id=6187...0b430f4af99634


MultiMap FlexFuel Stage2+ E30 w E50 in tank

https://www.bootmod3.net/log?id=6187...90c6283fe0a9a2

Hope this helps!
Awesome, thanks!

First, comparing your Stage 2+ E30 log to mine (our IATs and engine temps are in a similar range), it's interesting that you're hitting 14.0 max timing and I'm 12.5. However, you begin to not meet boost target above 5K RPM and are 5psi below target at redline. That must just be the flow restriction on your F30's turbo & manifold, but it looks like the map is compensating by increasing timing with the lower actual boost levels? IDK.

As for the difference bn Stg 2+ E30 and the Multimap, you hit max timing of 15.5 with a similar deviation in boost target above 5K. With the ethanol sensor and flex blend factor in play with the Multimap, things like STFT's are being managed differently and it looks like you're making more power.

But, how does the Stg 2+ Multimap feel comparing to the Stg 2+ E30 OTS to you?
And, how do both maps feel in general to you above 5k RPM when your actual boost is dropping below target? Quicker to shift at 6K RPM?

Lastly, some guys report that burble settings are lost b/n Map 1 and the other selectable maps, when switching between them. Is that also the case when doing flexfuel, or do burble settings stay intact as ethanol levels and the map scale up and down?
Thanks for your response. I've been collecting logs as much as possible but don't have laptop access right now to dig into what in them. Any log analysis is appreciated. Answers to your questions below:

Obviously my stock N55 EWG turbo flows less air than aftermarket turbo upgrades. But I have taken the time to upgrade the airflow as much as possible. Right now there is an MST Intake with a 15% larger than stock cone airfilter to a Pure Turbos Inlet Pipe (soon to be an MST Inlet Pipe). The less restrictive inlet pipe added last year increased airflow from 5,000 RPMs on up, as shown by MAF values before/after.

The FlexFuel MultiMap definitely feels more powerful with E50 in the tank. I'm hoping to actually do dyno runs with the various tunes next month.

I haven't formulated an opinion on either of the Stage2+ E30 tunes because I only flashed them long enough yesterday to take about 15 different logs. Since I did the hardware upgrades about a week ago I've just been running the FlexFuel MultiMap Stage2 91ACN because my local E85 station was out of stock. After logging I left it flashed to FlexFuel MultiMap Stage2+ E30, so I'll get more experience driving that tune this week.

When I run this tankful of E50 down next week, then I'm going to put E65/E70 in the tank and take some logs. That's about where the stock LPFP maxes out but I now have a Precision Raceworks LPFP 2.5. Later I'll bump it up to E85 in the tank and take logs there.

I can't speculate much about the tunes over 5,000 RPMs because it's just been 1-2 seconds while I'm taking a log. Right now I'm running the BootMod3 Automatic Transmission Tune. I haven't paid attention to how much it's allowing revs over 5,000 RPMs.

I don't like to introduce extra variables when I'm doing testing and collecting data. In a few weeks I'm considering installing the XHP Transmission Tune using either their Stage2 or Stage3 configuration. It's my daily, not a track car, so any opinions are appreciated.

I can't offer any information about burbles. My wife and I grew tired of burbles especially with our close neighbors so I turned burbles off completely in BootMod3. Our car is a sleeper. The exhaust sound really comes alive when we step on it.

Hope this helps!
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      11-07-2021, 10:29 AM   #40
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johnung thanks for your input. And, agreed on the burbles. Mine are practically all the way off already, so they'd get turned off completely if I had issues with them on the Multimap.

Dj_Quik mentioned that PTF is releasing an ethanol sensor setup soon, so I'll probably wait until that comes out before using the Multimap, vs messing with the Live Adjust.

Thanks for the logs, I'm glad we were able to get some data and subjective feedback on the Stg 2+ maps and higher ethanol mix!
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      11-07-2021, 10:35 AM   #41
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Quote:
Originally Posted by ZM2 View Post
Quote:
Originally Posted by johnung View Post
I just took a whole bunch of logs with E50 in the fuel tank. I did the MultiMap FlexFuel Stage2 91ACN, 91, and 93 tunes and MultiMap FlexFuel Stage2+ E30 tune and regular Stage2+ E30 tune.

Below are two that you were interested in comparing:

Stage2+ E30 w E50 in tank

https://www.bootmod3.net/log?id=6187...0b430f4af99634


MultiMap FlexFuel Stage2+ E30 w E50 in tank

https://www.bootmod3.net/log?id=6187...90c6283fe0a9a2

Hope this helps!
Awesome, thanks!

First, comparing your Stage 2+ E30 log to mine (our IATs and engine temps are in a similar range), it's interesting that you're hitting 14.0 max timing and I'm 12.5. However, you begin to not meet boost target above 5K RPM and are 5psi below target at redline. That must just be the flow restriction on your F30's turbo & manifold, but it looks like the map is compensating by increasing timing with the lower actual boost levels? IDK.

As for the difference bn Stg 2+ E30 and the Multimap, you hit max timing of 15.5 with a similar deviation in boost target above 5K. With the ethanol sensor and flex blend factor in play with the Multimap, things like STFT's are being managed differently and it looks like you're making more power.

But, how does the Stg 2+ Multimap feel comparing to the Stg 2+ E30 OTS to you?
And, how do both maps feel in general to you above 5k RPM when your actual boost is dropping below target? Quicker to shift at 6K RPM?

Lastly, some guys report that burble settings are lost b/n Map 1 and the other selectable maps, when switching between them. Is that also the case when doing flexfuel, or do burble settings stay intact as ethanol levels and the map scale up and down?
Below are some additional Stage2+ logs if you wish to compare them for consistency with the first two logs that I posted.

N55 EWG- all logs taken with E50 fuel mix

BootMod3 Stage2+ E30 with E50 in tank

https://www.bootmod3.net/log?id=6187...90c6283fe0a97e

https://www.bootmod3.net/log?id=6187...90c6283fe0a982


FlexFuel MultiMap Stage2+ E30 w E50 fuel

https://www.bootmod3.net/log?id=6187...0b430f4af9966e

https://www.bootmod3.net/log?id=6187...0b430ecab68584

Hope this helps!
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      11-07-2021, 10:38 AM   #42
ZM2
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Quote:
Originally Posted by johnung View Post
Below are some additional Stage2+ logs if you wish to compare them for consistency with the first two logs that I posted.

N55 EWG- all logs taken with E50 fuel mix

BootMod3 Stage2+ E30 with E50 in tank

https://www.bootmod3.net/log?id=6187...90c6283fe0a97e

https://www.bootmod3.net/log?id=6187...90c6283fe0a982


FlexFuel MultiMap Stage2+ E30 w E50 fuel

https://www.bootmod3.net/log?id=6187...0b430f4af9966e

https://www.bootmod3.net/log?id=6187...0b430ecab68584

Hope this helps!
My quick review shows exactly the same behavior and differences bn the Stg 2+ E30 OTS and Stg 2+ Multimap. Thanks for the additional logs, and glad to see everything is staying consistent!

Maybe other folks have input on the logs, as well.

Last edited by ZM2; 11-07-2021 at 10:56 AM..
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      11-07-2021, 11:09 AM   #43
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Quote:
Originally Posted by ZM2 View Post
johnung thanks for your input. And, agreed on the burbles. Mine are practically all the way off already, so they'd get turned off completely if I had issues with them on the Multimap.

Dj_Quik mentioned that PTF is releasing an ethanol sensor setup soon, so I'll probably wait until that comes out before using the Multimap, vs messing with the Live Adjust.

Thanks for the logs, I'm glad we were able to get some data and subjective feedback on the Stg 2+ maps and higher ethanol mix!
I'm really happy with the Zeitronix CANBus ethanol sensor. Pro Tuning Freaks did the MultiMap testing with it and it's recommended right on the BM3 tune notes when you flash.

Rather than being located at the LPFP near the tank, the Zeitronix is placed at roughly the halfway point in the fuel line between the LPFP and the HPFP. Precision Raceworks fuel lines replace the stock fuel lines. I also really like that I have a Zeitronix ethanol gauge on my dash. I always know exactly the ethanol percentage entering the engine. Photos and links are attached.

Zeitronix CANBus Sensor

https://www.kiesmotorsports.com/prod...8;_ss=r?aff=22

Zeitronix Ethanol Sensor

https://www.kiesmotorsports.com/prod...8;_ss=r?aff=22

Precision Raceworks Fuel Line Kit
(Choose FlexFuel connection)

https://www.kiesmotorsports.com/prod...8;_ss=r?aff=22

Hope this helps!
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      11-07-2021, 11:44 AM   #44
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Performance of FlexFuel Tunes with E50?

Quote:
Originally Posted by johnung View Post
After the FlexFuel required hardware is installed, a BootMod3 MultiMap tune must be flashed. A base map is chosen, I presume that it is supposed to match the base fuel being used in the tank before E85 is added.

So that might be say one of these:
1) Stage2 91
2) Stage2 93
3) E30

Assume that E50 is placed in the tank and the CANBus sensor tells the ECU that it's fuel is E50. Since FlexFuel algorithms automatically scale the tune up to use E50, then are all three of these tunes essentially identical? Or does the fact that the three started as different tunes effect their performance with E50? Thanks!

Car/Mods: F30 335ix N55 EWG FBO with Dorch2, LPFP upgrade, Zeitronix CANBus sensor, 3.5bar TMAPs.
My car now has upgraded Dorch2 HPFP and Precision Raceworks 2.5 LPFP, along with a Zeitronix CANBus ethanol sensor and ethanol gauge with Precision Raceworks fuel lines. So I am going to run one of the BootMod3 FlexFuel MultiMap tunes. But which one?

It appears that a MultiMap Stage2 or Stage2+ base tune is supposed to be chosen as a minimum quality of fuel that the tune begins at. So if FlexFuel MultiMap Stage2 91ACN is flashed that should mean that even poor quality 91 Octane could be put in the tank if ethanol fuel is not available.

But if the assumption is made that ethanol fuel will always be available, then the FlexFuel MultiMap Stage2+ E30 might be flashed as the minimum tune.

THE BIG QUESTION IS if both of these tunes are provided with E50 fuel, because they are FlexFuel tunes, do they have identical performance, or not? Below are logs of the two. Any analysis/ opinions are appreciated!

BootMod3 FlexFuel MultiMap Stage2 91ACN with E50 in the tank

https://www.bootmod3.net/log?id=6186...0b430ecab684c4

https://www.bootmod3.net/log?id=6186...0b430f4af9958f

BM3 FlexFuel MultiMap Stage2+ E30 with E50 in the tank

https://www.bootmod3.net/log?id=6187...90c6283fe0a9a2

https://www.bootmod3.net/log?id=6187...0b430f4af9966e

https://www.bootmod3.net/log?id=6187...0b430ecab68584
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