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08-08-2006, 05:59 PM | #91 |
Here in Denver, CO we have 85,87 and 91 octane. Since we are at a higher altitude it is recommended by the dealer to run the 85. You only need to run higher octane on higher compression engines.
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I am not allowed to put anything here because I do not have any ricey mods on my Yaris.... |
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08-08-2006, 07:02 PM | #92 | |
Podiatrist
Drives: Turbo IS300 Join Date: May 2006
Location: MA
Posts: 83
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08-18-2006, 09:38 PM | #93 |
Evil Kitty
Drives: 07 Yaris Liftback A4 AB/Red Join Date: Aug 2006
Location: Atlanta, GA
Posts: 55
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Dont think you should be running 100 octane, I only use that when going to the dragstrip in my SS or GTO, just less chances of running on the low octane tables and less chance of knock.
I have been running the it on the lowest regular octane at any of the stations. Truthfully not careing as long as it was cheap. Runs great and getting the advertised 32 mph city. I am sure yanking the spare and putting in the CIA will help more then anything else, header and tuning also.
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07 Yaris A4 Absolute Red: No mods "YET" 04 GTO www.purplegto.com 01 Camaro SS Convertible SLP#1331 http://www.2001CamaroSS.com |
08-19-2006, 10:49 PM | #94 |
Drives: icebox Join Date: Apr 2006
Location: CAN
Posts: 1,003
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Just put in the cheap stuff and drive...
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08-22-2006, 07:58 PM | #95 | |
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08-23-2006, 05:53 PM | #96 |
Lower octane gas will fire with less compression, if its misfiring or pinging the gas is lighting up well before TDC, higher octane will bring the flashpoint back up to prevent this. Ive found this really only happens on older vehicles where the timing (among everything else) is old and worn. Carbon buildup can cause this as well. High compression engines (60's-70's and less so 80's and rebuilt hi-po engines) require higher octane to prevent detonation and literal meltdown. What I dont really understand is in the scheme of things the Yaris is a high compression engine - it runs at 10.5:1 and can run on 87 octane... my 70 chev with a built 350 runs 10.25:1 and I cant get away with anything less than 91... it doesnt have aluminum heads but I never understood why one works and the other doesnt....
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