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06-24-2014, 07:07 PM
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#51 | | y'all better put some respeck on my name
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So I've been pouring Shell 91 in my 750i for the past couple of weeks. I usually pour Chevron 94 but wanted to see what happen if I switched to Shell 91 because 91 is the BMW recommended octane.
What I found is with 91 my car has a very rough idle when I come to a full stop at the lights, feels similar to the infamous gas pump issue the early e92's had. With 94 I never encountered a rough idle.
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06-25-2014, 10:31 AM
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#52 | | Ready to be Man handled by RS!
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My car do require 94...  | |
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06-25-2014, 01:18 PM
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#53 | | NOOB, Not Quite a Regular!
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Originally Posted by IMASA  Yup, I agree. Chevron 94 octane lets me run timing similar to what others using Cali 91 gas run. US 92 is far superior than our 94. | Agreed
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06-25-2014, 01:30 PM
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#54 | | To me, there is the Internet and there is RS
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Does anyone have any science to back up this US 92 > CDN 94? I mean an actual fuel analysis comparing multiple brands, not some dyno pulls that leave a shit tonne of variables out of the equation.
Also octane boosters are junk, if you need to bump your octane use Toluene which can actually bump your octane a significant amount, the boosters will only bump you like 0.1
__________________ 1991 Toyota Celica GTFour RC // 2007 Toyota Rav4 V6 // 2000 Jeep Grand Cherokee
1992 Toyota Celica GT-S ["sold"] \\ 2007 Jeep Grand Cherokee CRD [sold] \\ 2000 Jeep Cherokee [sold] \\ 1997 Honda Prelude [sold] \\ 1992 Jeep YJ [sold/crashed] \\ 1987 Mazda RX-7 [sold] \\ 1987 Toyota Celica GT-S [crushed] Quote:
Originally Posted by maksimizer half those dudes are hotter than ,my GF. | Quote:
Originally Posted by RevYouUp reading this thread is like waiting for goku to charge up a spirit bomb in dragon ball z | Quote:
Originally Posted by Good_KarMa OH thank god. I thought u had sex with my wife. :cry: | | 
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06-25-2014, 01:54 PM
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#55 | | To me, there is the Internet and there is RS
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Originally Posted by LemonT I remember RG did a dyno of US Chevron 92 vs CND 94 on a stock wrx with a stock tune, made something like 5% extra HP, My butt dyno seemed to notice the difference as well in my own car, link: http://www.revscene.net/forums/68154...dien-fuel.html
Correction: CND 94 typo | Except the 02 WRX calls for 91, not 94, and it's known that running too high of an octane will lose you power. So they didn't gain anything, they lost power because they used too high of an octane.
Plus you have to factor in how the ECU works, you would need to reset it, completely drain the fuel system, then drive it time to learn, then dyno. Repeat for every other fuel you want to test with.
__________________ 1991 Toyota Celica GTFour RC // 2007 Toyota Rav4 V6 // 2000 Jeep Grand Cherokee
1992 Toyota Celica GT-S ["sold"] \\ 2007 Jeep Grand Cherokee CRD [sold] \\ 2000 Jeep Cherokee [sold] \\ 1997 Honda Prelude [sold] \\ 1992 Jeep YJ [sold/crashed] \\ 1987 Mazda RX-7 [sold] \\ 1987 Toyota Celica GT-S [crushed] Quote:
Originally Posted by maksimizer half those dudes are hotter than ,my GF. | Quote:
Originally Posted by RevYouUp reading this thread is like waiting for goku to charge up a spirit bomb in dragon ball z | Quote:
Originally Posted by Good_KarMa OH thank god. I thought u had sex with my wife. :cry: | | |
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06-25-2014, 02:30 PM
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#56 | | What hasn't Killed me, has made me more tolerant of RS!
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Originally Posted by underscore Does anyone have any science to back up this US 92 > CDN 94? I mean an actual fuel analysis comparing multiple brands, not some dyno pulls that leave a shit tonne of variables out of the equation.
| Disclaimer: I'm not an expert but this is the clearest answer I've pieced together without actually talking to a tuner in person.
From what I understand it's pretty much all down to the "zero" ethanol content of Chevron 94.
In FI applications, ethanol is more "stable" at compression and is wanted to prevent detonation (ethanol changes the RON vs MON ratio of that fuel), but it puts out less energy / burns cooler during combustion. So you typically add a bit more fuel to keep things right, especially as boost pressure increases. A lot of big power turbo builders seem to leap at the chance to run e85, presumably for this reason.
NA motors & tuners prefer fuel with as little ethanol as possible because boost/air density is less variable. They're just focused on spark timing and resultant AFR.
Many fuel maps written by tuners in the US or other regions may be writing in an assumed adjustment for a 10% ethanol content - which usually adds a certain % more fuel. On Chevron 94, this extra fuel will make your car seem bogged down due to a richer mix.
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06-25-2014, 04:41 PM
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#57 | | To me, there is the Internet and there is RS
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Originally Posted by eason_c My car do require 94... | What car?
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06-25-2014, 09:10 PM
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#58 | | My homepage has been set to RS
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i think he drives a CLA
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06-26-2014, 10:23 AM
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#59 | | Ready to be Man handled by RS!
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Originally Posted by Manic! What car? | E63
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06-26-2014, 03:17 PM
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#60 | | To me, there is the Internet and there is RS
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Originally Posted by eason_c E63 | So what do people in Cali do? The highest they can get is 91.
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