What gas are you guys using?
Apr 20, 2012, 09:05 PM
#16
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The sensors will compensate the AFR to 14.7
Most tuners only tune the WOT areas in your map anyways.
So while cruising or driving normally, you're on stock values.
Apr 20, 2012, 09:55 PM
#17
high octane fuel burns slower so you can tune for that by advancing timing, and it is also more compressible so you can run a leaner AFR without knocking...factory tune and stock compression ratio, premium fuel will make your car slower before it makes it faster, and like nj_08_gts said, you'll get incomplete combustion...
since i last posted here, i turbocharged my engine, and i'm still running 91...
since i last posted here, i turbocharged my engine, and i'm still running 91...
Apr 20, 2012, 11:11 PM
#18
most gas stations i see have little stickers on them that say they "may" contain up to 10% ethanol...and everyone should knows alcohols are a high octane, slow burning fuel...but regardless, it's the fact that it's burning slower that it's reducing the likelihood of knock occuring...
Apr 20, 2012, 11:18 PM
#19
Do you have a source for that? Everything I've read so far suggests otherwise, namely that the fuels burn just as fast. It makes sense to me that it would burn slower but who knows. The problem with ethanol is it also reduces the energy content of the fuel.
Apr 20, 2012, 11:24 PM
#20
http://www.stockcarracing.com/techar...l/viewall.html
This would suggest that octane rating has nothing to do with burn speed. It is purely an indication of resistance to knock. If you have no knock, the burn speed is the same. If you get knock though, this speeds up the burn because you get flame fronts from multiple sites.
This would suggest that octane rating has nothing to do with burn speed. It is purely an indication of resistance to knock. If you have no knock, the burn speed is the same. If you get knock though, this speeds up the burn because you get flame fronts from multiple sites.
Last edited by ambystom01; Apr 20, 2012 at 11:30 PM.
Apr 21, 2012, 12:18 AM
#21
i've just always heard that, and not from randoms, like mechanics, and guys that build engines for a living...and even the source you posted doesn't actually say for sure that it doesn't, but that there's no conclusive evidence that it does... they just go one to say that it for sure is more resistant to heat and pressure...i checked a few other sources, inluding this random google search and they say similar things, not that it for sure doesn't burn slower, but there's no solid evidence...they only say what they know for sure, which is quite common knowledge (temperature/pressure resistance)...but then the say stuff like, "burn rate is a function of several variables, and the two are completely independent, although there is generally a correlation between octane ratings and burn rates."
this is confusing, it's like saying "high octane fuel doesn't burn slower, but generally higher octane fuels tend to burn slower"...it's like nobody even knows for sure.
this is confusing, it's like saying "high octane fuel doesn't burn slower, but generally higher octane fuels tend to burn slower"...it's like nobody even knows for sure.
Apr 21, 2012, 10:36 PM
#27
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I use mitsulogger with the tactrix 1.3U.
I've always wanted to log my car when it was stock, but the technology didnt exist back then
It'd be interesting to see
I've always wanted to log my car when it was stock, but the technology didnt exist back then
It'd be interesting to see
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