Quote:
Originally Posted by Astroboy
So what if I'm on a conservative tune for 93oct and only pushing 250whp/200lbs, Is that on the safer side or should I switch to e85?
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Meh unless you are on the track doing hot laps endlessly running on the street with pump gas on a conservative tune is going to be just fine. If the car was tuned to peak power and then a few degree's pulled in the end so that way there is plenty of room for poor quality gas and higher temperature conditions its just fine. E85 has better thermal properties as well as being more stable from the octane rating so you can be more lazy on the timing and not worry when you are being "conservative". Also doing lots of hot sessions ill be better on a race fuel or something with better thermal properties such as E85. If your happy with your power and it is conservative (IAM stays at 0 and knock feedback is minimal after getting the car nice and warm) then you are fine. Pushing more power out of the car with E85 is adding extra stress on the internal components.
When it comes to reliability for long term wear having a clean tune and lower power output is easier on the internals. When it comes to random catastrophic failure having a better quality fuel is a big player. So if you are trying to push the car to 300WHP on 91 octane which is pushing the envelope of the fuel... its pushing you in that catastrophic zone more so than doing a super light tune on E85 for the same horsepower (or pump 100 octane).
I would daily a car on 91 octane @ 250WHP all day every day. I have seen many cars locally run 20k+ miles without any issues at that power level even with iffy tunes showing minor knock feed back.