[Munchi435i]

Originally Posted by JaredG_F30

So is the Full E85 map faster than the Stage2+ E30 or 93 octane maps? I'd love to see a log if you have one.

Doubtful!

It limits boost, so the only real benefit is not having to measure E85 mixes.

[rcsup1]

Originally Posted by Munchi435i

Doubtful!

It limits boost, so the only real benefit is not having to measure E85 mixes.

To answer your question the benefit is that you can run much more timing on full E85.

[e46m3to335i]

Originally Posted by rcsup1

To answer your question the benefit is that you can run much more timing on full E85.

True, however, with "more" timing in turn means "less" boost needs to be demanded by the ECU to meet load targets. You can't have more timing and more boost without issues.

More timing and less boost = More boost and less timing. Just two different ways to increase power.

If I'm not mistaken. Anything past E50 has diminishing returns in terms of performance when blending E85.

[Phyrexia]

Next time I fill up, I'll go full E85 report back.

Originally Posted by JaredG_F30

So is the Full E85 map faster than the Stage2+ E30 or 93 octane maps? I'd love to see a log if you have one.

[cesarortiz23]

After reading all these feedbacks and comments seems like very huge hassle to run full e85 lol

I'll rather just occasionally run 2 or 3 gallons of e85

When ever I don't run e85
Bm3 stayed my timing was all over the place and that gas quality is horrible here in cali so idk

[adrien78]

E85 map is not used to be a "performance" map, I don't think it's very usefull for US, maybe more in europe.
In France a SP98 refuel cost $108, E85 refuel cost $43... For me, that why I wanted E85.
I know HPFP is a huge limitation to run E85 with a nice boost, but I'm using it for daily driving so even if I use like 30% more fuel with E85, money saving my friends.

Don't use full E85 map for performances, that's not the goal.

[rcsup1]

Originally Posted by e46m3to335i

True, however, with "more" timing in turn means "less" boost needs to be demanded by the ECU to meet load targets. You can't have more timing and more boost without issues.

More timing and less boost = More boost and less timing. Just two different ways to increase power.

If I'm not mistaken. Anything past E50 has diminishing returns in terms of performance when blending E85.

Full E85 has a higher knock threshold than E50 or E30. So you would not need to reduce boost with increased timing. That is the whole point of running straight E85. The idea is to increase the load targets accordingly to make more power on the higher octane. There is a substantial difference between E50 and E85. This is why some even go as high as E98 over E85 which is significantly harder to obtain.

[ronanz]

Keep in mind you should always have some form of a fuel analyzer as “e” content is more often than not, MUCH lower than stated at pump

.

[jh_f30]

I had a question that is E85 related, and since this seems to be the most current thread on the topic, figured I'd do a little threadjacking. My apologies in advance.

I have a flash tune with stage 2 maps for both 91aki and E30. Pretty much every time I remap from E30 back to 91, my car will stumble a bit on initial startup/idle. ALMOST to the point of stalling out, and it think it has actually stalled once before. This usually goes away after subsequent fills of 91. Any ideas on why this happens? Is it normal? Anyone else have similar experiences?

[adrien78]

Originally Posted by jh_f30

I had a question that is E85 related, and since this seems to be the most current thread on the topic, figured I'd do a little threadjacking. My apologies in advance.

I have a flash tune with stage 2 maps for both 91aki and E30. Pretty much every time I remap from E30 back to 91, my car will stumble a bit on initial startup/idle. ALMOST to the point of stalling out, and it think it has actually stalled once before. This usually goes away after subsequent fills of 91. Any ideas on why this happens? Is it normal? Anyone else have similar experiences?

that's normal, 91 map fuel injection values at starting are not the same than E30 I think.

[rcsup1]

Originally Posted by jh_f30

I had a question that is E85 related, and since this seems to be the most current thread on the topic, figured I'd do a little threadjacking. My apologies in advance.

I have a flash tune with stage 2 maps for both 91aki and E30. Pretty much every time I remap from E30 back to 91, my car will stumble a bit on initial startup/idle. ALMOST to the point of stalling out, and it think it has actually stalled once before. This usually goes away after subsequent fills of 91. Any ideas on why this happens? Is it normal? Anyone else have similar experiences?

Do you reset adaptations after you flash?

[jh_f30]

Originally Posted by rcsup1

Do you reset adaptations after you flash?

Not usually. Maybe I'll give that a shot.

[ChristosD]

I'm going to stick my hand up and admit I did not know the n55 could run full e85 with the stock hpfp even with a 450 walbro lpfp. Is this true?

[adrien78]

Originally Posted by ChristosD

I'm going to stick my hand up and admit I did not know the n55 could run full e85 with the stock hpfp even with a 450 walbro lpfp. Is this true?

i'm running it since 3 months, stock LPFP + HPFP.

[ChristosD]

Originally Posted by adrien78

i'm running it since 3 months, stock LPFP + HPFP.

Awesome what are your boost targets on the e85 map and have you dynoed yet

[adrien78]

Originally Posted by ChristosD

Awesome what are your boost targets on the e85 map and have you dynoed yet

About 13 psi, I'm using modifed map from MHD stg2 (too much psi for the HPFP).
No dyno at this time, I'm using it fore the price compared to gazoline.

[ChristosD]

Originally Posted by adrien78

About 13 psi, I'm using modifed map from MHD stg2 (too much psi for the HPFP).
No dyno at this time, I'm using it fore the price compared to gazoline.

Ah ok that's epic to know. Would I guess the e30 map make more power as it's probably pushing 17psi of boost +?

[adrien78]

Originally Posted by ChristosD

Ah ok that's epic to know. Would I guess the e30 map make more power as it's probably pushing 17psi of boost +?

Yes of course, E30 map is designed for max power.

[thejeremyman9]

Originally Posted by Phyrexia

Next time I fill up, I'll go full E85 report back.

Bump - did you ever do this? I am looking for some logs of people running MHD's full e85 map for N55 EWG.

This is what MHD posted back in June 2019 in the MHD thread. Namely, "And they are the most powerful Stage 1 and 2 maps"

Today's update brings many nice things to the MHD F+G Series users:
--------------------------------------------
- N55 EWG: added full e85 Stager 1 and 2 maps.
- N55 / B58 / N13 : added coolant flash option (Performance and Track).
- N55 / N13 / M2 N55 : added start up roar (noticeable with cold start deactivated).
- B58: allow burble on OPF cars.
- Full M3/M4 CS and M2C support, including OPF delete option
- Added CS / GTS trans flash for M2 N55, M2C, M3, M4
- various fixes for Burble and exhaust flap open on sport.
--------------------------------------------
The Stage 1 and 2 full e85 maps for N55 EWG will produce a relatively flat torque, with max power near redline. With those maps no need to mix every fill up! And they are the most powerful Stage 1 and 2 maps. No 2+ full e85 map is doable due to fueling limitations.
--------------------------------------------
Another nice feature for N55, B58 and N13 cars: We found a way to bring the M switchable coolant feature to non-M cars. With the coolant flash option activated, the coolant target will be 95c in eco / comfort instead of 106c+. If you switch to sport mode (or comfort + transmission in S or M), the coolant target will be 85c with performance or 80c with track option selected. This allows the engine to run cooler and oil temperature will also benefit from that significantly. We also changed many fan settings to further improve how quick the system reacts to the different modes, this also helps to reduce the IAT and under hood temps when staging at a drag strip or slow city driving.
--------------------------------------------
The M3, M4, M2 N55 and M2 Competition owners now have the much anticipated CS & GTS TCU flash available through MHD (M2C only CS) - this is a free update included in the Flasher License.
--------------------------------------------
We also added full support for recent euro spec S55 cars equipped with a OPF / GPF (plus delete option)

[Munchi435i]

Originally Posted by thejeremyman9

Bump - did you ever do this? I am looking for some logs of people running MHD's full e85 map for N55 EWG.

This is what MHD posted back in June 2019 in the MHD thread. Namely, "And they are the most powerful Stage 1 and 2 maps"

I personally have not tried those full E85 tunes but according to the feedback on the whatsup chat group. These maps are intended for those that have access to E85 and the cost is cheaper than 93 octane.

Plus in there statement it doesn't reference these maps being "more powerful" compared anything so it's kind of vague.

[thejeremyman9]

Originally Posted by Munchi435i

I personally have not tried those full E85 tunes but according to the feedback on the whatsup chat group. These maps are intended for those that have access to E85 and the cost is cheaper than 93 octane.

Plus in there statement it doesn't reference these maps being "more powerful" compared anything so it's kind of vague.

MHD's statement of "The Stage 1 and 2 full e85 maps for N55 EWG will produce a relatively flat torque, with max power near redline. With those maps no need to mix every fill up! And they are the most powerful Stage 1 and 2 maps. No 2+ full e85 map is doable due to fueling limitations" to me directly implies that these are the most powerful stage 1 and 2 maps for a N55 EWG OTS tune.

I have read on other threads from users exactly what you stated - the full e85 maps are ran for fuel price/availability reasons, not maximum performance. But this seems to directly contradict what MHD posted.

I am interested to see some full e85 stage 1 logs, would really like to compare to my stage 1 91oct logs.

[adrien78]

Originally Posted by thejeremyman9

I have read on other threads from users exactly what you stated - the full e85 maps are ran for fuel price/availability reasons, not maximum performance. But this seems to directly contradict what MHD posted.

I am interested to see some full e85 stage 1 logs, would really like to compare to my stage 1 91oct logs.

For sure E85 maps is not used for performance. I'm using it since it's available and was a beta tester too. There is better timing but boost is very limited.

It's more related to fuel price (in Europe => France)

I'm using stg1 at this time, I can do some logs if you want.

stg2 is too hard for HPFP, I have some pressure drop and power loss. I think I need to install HDP6 to handle it fine.