Dilemma

Joy15779 · 09-06-2022, 03:24 PM

Hi dears!

Just wondering why my stock m4 engine cannot handle more than 700 hp (kratos turbo working at 1.8 bar only) while if I switch to E85 same engine handleuch more power safe!

JAI///M3 · 09-06-2022, 10:50 PM

E85 has a higher octane equivalent when compared to pump gas (~105 octane) as well as a cooling effect from the ethanol. Both of these factors will allow you to run a more aggressive tune (ignition timing) while preventing knock, which, if done right, will result in more power output.

TractionControlDelete · 09-06-2022, 11:21 PM

Quote:

Originally Posted by Joy15779

Hi dears!

Just wondering why my stock m4 engine cannot handle more than 700 hp (kratos turbo working at 1.8 bar only) while if I switch to E85 same engine handleuch more power safe!

Check this out for a breakdown of what you can expect: https://www.bimmerpost.com/forums/sh...php?p=26025202

09-06-2022, 03:24 PM	#1
Joy15779 Second Lieutenant 50 Rep 239 Posts Drives: BMW M4 F83 Join Date: Sep 2021 Location: Brescia - Italia iTrader: (0)	Dilemma Hi dears! Just wondering why my stock m4 engine cannot handle more than 700 hp (kratos turbo working at 1.8 bar only) while if I switch to E85 same engine handleuch more power safe!
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09-06-2022, 10:50 PM	#2
JAI///M3 Lieutenant 528 Rep 502 Posts Drives: F80 M3 Join Date: Dec 2021 Location: East Bay iTrader: (0) Garage List 2018 F80 [0.00]	E85 has a higher octane equivalent when compared to pump gas (~105 octane) as well as a cooling effect from the ethanol. Both of these factors will allow you to run a more aggressive tune (ignition timing) while preventing knock, which, if done right, will result in more power output.
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