my friend just purchased a 97 integra
skunk2 pro 2 cams
gsr block b16 head
w/ ctr pistons block bored 82mm
type R IM
RC 440cc Injectors
ls crank and rods
previous owner he got from said it was tuned on e85 and got 190
is it possible for him to just fuel back up on 91 pump gas?

 

anyone?

 

also i understand e85 burns colder? and it can be inconsistent depending on cold and summer times?

so is it best on hot summer days or cold nights?

 

It takes about 40% more E85 to reach the correct fuel-air ratio than it does straight unleaded.

Going back to straight gas would probably leave you running very rich, and possibly with more advanced timing than you'd like (if they took advantage of the ethanol's higher octane).

Be nice to know what was done for that 'tune' - the larger injectors may be a big part of it. They may have adjusted fuel pressure.. who knows?

Any way to find out more about what was done?

Thing is, they may have found a nice balance with larger injectors, E85, better CAM, etc so that rather than tune the ECM they've managed to juggle the mods to achieve the same effect.

Mark

 

You will need to tune it for gasoline. As Mark said, it will run rich... very rich.

 

so does e85 run better in hotter conditions or colder?

 

E85 runs better with higher compression or forced induction. It has a reported octane rating of 94-96 (R+M)/2.

Discussion for N/A and E85 can be found here:
https://honda-tech.com/forums/all-motor-naturally-aspirated-44/93-octane-vs-e85-dyno-results-naturally-aspirated-engine-2351459/

 

no wonder why it was running with ctr pistons

 

Check this: http://en.wikipedia.org/wiki/E85_in_standard_engines

I think that it would be most helpful in hot / boosted circumstances, but overall would expect it to be no worse except, perhaps, if you experience sub-zero starting temps often.

Mark
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