[kBrazy]

I was curious to see if I could run full E on my 340i.
Currently running MHD E40, but why don't people run full E85 on 340i's? I know you may need to upgrade low pressure.


Current mods: Downpipe, intake, TU Pump, Newly installed NGK plugs

[illllyas]

This video from kern should answer all your questions: https://m.youtube.com/watch?v=fgEPGdWSW4U

[McBobby Jr]

You can run full E85 on a stock fuel system or with just an upgraded HPFP. You’ll just have to dial back power. But for best results, an E40-E60 blend is best but it will also depend on the HPFP you have. I’ve been running E92 on the MHD OTS Stage 2 HPFP E85 map and it’s worked fine so far. Not as much low-mid range power and torque as the E40 map.

[B58]

Originally Posted by McBobby Jr

You can run full E85 on a stock fuel system or with just an upgraded HPFP. You’ll just have to dial back power. But for best results, an E40-E60 blend is best but it will also depend on the HPFP you have. I’ve been running E92 on the MHD OTS Stage 2 HPFP E85 map and it’s worked fine so far. Not as much low-mid range power and torque as the E40 map.

Do you have a log for the full E and the OTS E85 map?

[McBobby Jr]

Yes, I have quite a few logs. Sometimes I got clean timing, sometimes it was horrific. I think my spark plugs need to be changed. Check out the logs https://datazap.me/u/mcbobby-jr/stag...og=0&data=4-23 , and https://datazap.me/u/mcbobby-jr/stag...og=0&data=4-23 . Let me know what you think, I have more logs if you’d like to see them.

[B58 parts]

I've had a couple crashes even with the dorch stg2 pump with the bm3 stg2+ e50 tune with full e85 in 5th gear. Probably issues with the ots tune. I've been sticking to e50 and it's not happened at all in 5th or 6th. It really doesn't feel good when that happens at 100mph, going to break a wrist pin

If your tune is good, yes

[DieselDuck]

Originally Posted by YuminNuman

I've had a couple crashes even with the dorch stg2 pump with the bm3 stg2+ e50 tune with full e85 in 5th gear. Probably issues with the ots tune. I've been sticking to e50 and it's not happened at all in 5th or 6th. It really doesn't feel good when that happens at 100mph, going to break a wrist pin

If your tune is good, yes

I mean obviously there's a reason it's an "E50" tune 😅

[B58 parts]

It's the multi map with flex fuel though, it's supposed to adjust and not do that, but it's happened twice now. So yeah e50 it's is until I get the port injection

[5w20]

Originally Posted by YuminNuman

I've had a couple crashes even with the dorch stg2 pump with the bm3 stg2+ e50 tune with full e85 in 5th gear. Probably issues with the ots tune. I've been sticking to e50 and it's not happened at all in 5th or 6th. It really doesn't feel good when that happens at 100mph, going to break a wrist pin

If your tune is good, yes

Are you on the dedicated stage 2+ E50 map and pumping straight E from the pump?

Originally Posted by DieselDuck

I mean obviously there's a reason it's an "E50" tune 😅

I don't have any issues with E70-E76 (best that I've had straight from the pump). Then again, I do use the FF sensor. Not sure if YuminNuman does the same or not.

[B58 parts]

No I'm on the stg2+ multi map map 3 e50 with flex fuel sensor. And yes straight e85, the pump around here is about e76. Normally it's fine but twice halfway through 5th gear it's had the hard breakup. Had that quite a few times with stock pump and screwing around e30-e50 in 3rd gear. It's not good to do, someone said something about the wrist pin, it feels like it hurts just about everything.

Now I fill up around 1/4 tank 8.5g e85 (76) and the rest about 3.5g 93, lands right at e55, none of that stuff, it rips.

[5w20]

Originally Posted by YuminNuman

No I'm on the stg2+ multi map map 3 e50 with flex fuel sensor. And yes straight e85, the pump around here is about e76. Normally it's fine but twice halfway through 5th gear it's had the hard breakup. Had that quite a few times with stock pump and screwing around e30-e50 in 3rd gear. It's not good to do, someone said something about the wrist pin, it feels like it hurts just about everything.

Now I fill up around 1/4 tank 8.5g e85 (76) and the rest about 3.5g 93, lands right at e55, none of that stuff, it rips.

That's weird.

I went from stage 1 93 and stock hardware to stage 2+ e50 w/FF sensor with the same LT4 pump without any issues. If I was in your shoes, I'd log it and see what's happening. It shouldn't be doing that, the LT4 HPFPis able to supply more than enough fuel for that map and it's demand.

[WrxToBeamerGuy]

Originally Posted by YuminNuman

It's the multi map with flex fuel though, it's supposed to adjust and not do that, but it's happened twice now. So yeah e50 it's is until I get the port injection

Thats not how the multimap with flex fuel works. If it flexes from pump 93 - e50 then anything above e50 is just using the e50 values.

i.e. e75 in the tank is using the e50 tables since thats the upper limit of the flex fuel map. It's called flex fuel because it will flex between pump 93 - e50.

Someone correct me if I'm wrong but I have failed to see anything in the custom rom tuning tables that suggests otherwise.

[G.Newt]

Originally Posted by kBrazy

I was curious to see if I could run full E on my 340i.
Currently running MHD E40, but why don't people run full E85 on 340i's? I know you may need to upgrade low pressure.


Current mods: Downpipe, intake, TU Pump, Newly installed NGK plugs

You can run whatever mix of E85 you want on any hardware that you have. You'll make less power when going past a certain point, however.

Edit: with a custom tune.

[5w20]

Originally Posted by WrxToBeamerGuy

Thats not how the multimap with flex fuel works. If it flexes from pump 93 - e50 then anything above e50 is just using the e50 values.

i.e. e75 in the tank is using the e50 tables since thats the upper limit of the flex fuel map. It's called flex fuel because it will flex between pump 93 - e50.

Someone correct me if I'm wrong but I have failed to see anything in the custom rom tuning tables that suggests otherwise.

Wrong for BM3 scenario. See below.

Originally Posted by G.Newt

You can run whatever mix of E85 you want on any hardware that you have. You'll make less power when going past a certain point, however.

That’s not entirely true. It certainly seems that way for MHD, but I know for a fact it isn’t that way on the BM3 stage 2+ (F3x B58, F87 M2 N55, F3x N55) maps when equipped with the FF sensor. Boost doesn’t drop with higher ethanol content, instead it remains steady while timing increases.

[G.Newt]

Originally Posted by 5w20

Wrong for BM3 scenario. See below.



That’s not entirely true. It certainly seems that way for MHD, but I know for a fact it isn’t that way on the BM3 stage 2+ (F3x B58, F87 M2 N55, F3x N55) maps when equipped with the FF sensor. Boost doesn’t drop with higher ethanol content, instead it remains steady while timing increases.

*With a custom tune.

[5w20]

Originally Posted by G.Newt

*With a custom tune.

Wrong again. OTS map.

[McBobby Jr]

Here’s a screenshot from one of my logs on the OTS flex fuel map. This is on E92-93 as you can see at the top of the graph. Boost and power is linear, much more linear over the OTS E40 map.

[5w20]

Originally Posted by G.Newt

*With a custom tune.

Both Gen1 F3x vehicles.


E75
https://www.bootmod3.net/log?id=63d2...0b4397bb168b19


E47
https://www.bootmod3.net/log?id=63e4...90c67500d45558

[WrxToBeamerGuy]

Originally Posted by 5w20

Both Gen1 F3x vehicles.


E75
https://www.bootmod3.net/log?id=63d2...0b4397bb168b19


E47
https://www.bootmod3.net/log?id=63e4...90c67500d45558

I don't agree with this. Look at the RPMs that's why the graphs look so different. Compare the values at the same RPMs and you can see it's the same map....

If you're going to come in here and just reply "Wrong" then at least know what you're talking about.

[B58 parts]

The ots tune is pretty much totally fine with e85. (E76). Twice under high load 5th gear 100 mph the dorch stg2 pump crashed. Probably almost 100 other pulls even in 6th it's been fine.

If the tune was totally not able to do e85 it would blow up all the time, I'd be on engine #2 by now for sure. Halfway there probably. It's maybe slightly off under certain conditions or some other issues on my end. A pro tune would be good, I wish I knew enough to diy.

[WrxToBeamerGuy]

Originally Posted by YuminNuman

The ots tune is pretty much totally fine with e85. (E76). Twice under high load 5th gear 100 mph the dorch stg2 pump crashed. Probably almost 100 other pulls even in 6th it's been fine.

If the tune was totally not able to do e85 it would blow up all the time, I'd be on engine #2 by now for sure. Halfway there probably. It's maybe slightly off under certain conditions or some other issues on my end. A pro tune would be good, I wish I knew enough to diy.

The tune can handle full E85 if the pump isn't crashing, what I'm saying is that E50 and E85 are giving you the same amount of boost and timing advance. The only difference is cylinder temperature and knock resistance between E50 and E85.

If you have no timing corrections at E60 - 70 then E85 doesn't offer additional benefit.

[talontdone]

Originally Posted by WrxToBeamerGuy

The tune can handle full E85 if the pump isn't crashing, what I'm saying is that E50 and E85 are giving you the same amount of boost and timing advance. The only difference is cylinder temperature and knock resistance between E50 and E85.

If you have no timing corrections at E60 - 70 then E85 doesn't offer additional benefit.

Well said!