Race fuel anyone?
05-15-07, 11:18 AM
#1
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Race fuel anyone?
I occasionally give the beast 100 octane race fuel from a local source. The difference is amazing. If you are one those who can feel subtle differences in engine performance, suspension dampening, environmental influences i.e. heat, cold ect. Then you will love how clean, healthy and free revving some race fuel will make the high compression 350. Are there any drawbacks to the occasional indulgence? Post away!!!
05-15-07, 02:24 PM
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High compression/performance motors thrive on 100 octane fuel, no dispute or doubt about it. No placebo here. There is a difference between what you want and what you need. If you have put regular in a motor that wants premium octane or more you have might be able to tell the difference depending on how well you know your idle and engine noise, responce ect. (someone with no musical ear can't distinguish pitch) If you usually put regular in your IS350, then try some race fuel and get back to me.
Last edited by IS350PRO; 05-15-07 at 02:35 PM.
05-15-07, 02:41 PM
#6
These are Japanese cars, of course they will perform differently with 100octane, thats what they were made for. In Japan, the lowest octane level they have is 100 (correct me if Im wrong). BTW IS350PRO, got any pics of the whip?? It looks really nice in that teeny pic you got there LOL
05-16-07, 11:40 PM
#7
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You have been corrected. Japanese fuel is rated differently, but performs just like the US mixtures. They do not have 100 R+M/2 fuel at the pump any more than we have it (unless it's race gas.)
PRO - sorry, I disagree. I've run 100 octane in a few things, primarily because they needed it. The difference is not subtle. If the 2GR-FSE wanted more than 91 octane, you'd see really crappy mileage when you run anything less than 91. Those of you running 93 are even better off because you have more margin for error (California doesn't have 93 anywhere.) However, you will not see a measurable performance difference between 93 and 100 octane in the 2GR-FSE as delivered by Lexus. Pure placebo.
PRO - sorry, I disagree. I've run 100 octane in a few things, primarily because they needed it. The difference is not subtle. If the 2GR-FSE wanted more than 91 octane, you'd see really crappy mileage when you run anything less than 91. Those of you running 93 are even better off because you have more margin for error (California doesn't have 93 anywhere.) However, you will not see a measurable performance difference between 93 and 100 octane in the 2GR-FSE as delivered by Lexus. Pure placebo.
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05-17-07, 07:14 AM
#8
You have been corrected. Japanese fuel is rated differently, but performs just like the US mixtures. They do not have 100 R+M/2 fuel at the pump any more than we have it (unless it's race gas.)
PRO - sorry, I disagree. I've run 100 octane in a few things, primarily because they needed it. The difference is not subtle. If the 2GR-FSE wanted more than 91 octane, you'd see really crappy mileage when you run anything less than 91. Those of you running 93 are even better off because you have more margin for error (California doesn't have 93 anywhere.) However, you will not see a measurable performance difference between 93 and 100 octane in the 2GR-FSE as delivered by Lexus. Pure placebo.
PRO - sorry, I disagree. I've run 100 octane in a few things, primarily because they needed it. The difference is not subtle. If the 2GR-FSE wanted more than 91 octane, you'd see really crappy mileage when you run anything less than 91. Those of you running 93 are even better off because you have more margin for error (California doesn't have 93 anywhere.) However, you will not see a measurable performance difference between 93 and 100 octane in the 2GR-FSE as delivered by Lexus. Pure placebo.
Koz
05-19-07, 04:25 AM
#11
LOL!
05-19-07, 10:43 AM
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Although i never used anything over 93 in the lexus, i have used C115 sunoco in street cars before and it does make a slight difference. It not going to break your neck or anything but you get a better throttle response. Just like any other minor mod the HP increases slightly but you dont really feel that much difference. For the most part it is in your mind. For the average driver they are not going to feel the difference from running a 13.3 compared to a 13.5.
05-19-07, 12:12 PM
#13
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Race fuel is great for cars that are tuned for it. If the ECU isn't tuned for it, then it's not going to make one bit of difference. I doubt Lexus spent the time and $ to add another program for the very unlikely event that someone would want to spend $6-7 for a gallon of 100+.
If anything, the race fuel will probably put the ecu on it most aggressive timing (just like 92 octane would.)
If anything, the race fuel will probably put the ecu on it most aggressive timing (just like 92 octane would.)
05-19-07, 03:27 PM
#14
In the very unlikely case that the OEM ECU would continuously "test the waters" with more agressive fuel trims and ignition timing to see if there might be ultra high octane fuel ... it would NOT do it quickly. You would have to run race gas for hundreds of miles before it could possibly figure it out. This would be best case.
Similarly, if you put 87 octane gas in your car for a few hundred miles, the ECU will immediately back off on ignition timing and enrich the fuel mixture due to knocking. It will take quite a bit of miles with premium fuel before the ECU will get back to normal again.
That reminds me that it's time to look for a colder version of our spark plug again...
Similarly, if you put 87 octane gas in your car for a few hundred miles, the ECU will immediately back off on ignition timing and enrich the fuel mixture due to knocking. It will take quite a bit of miles with premium fuel before the ECU will get back to normal again.
That reminds me that it's time to look for a colder version of our spark plug again...
Last edited by Gernby; 05-19-07 at 04:27 PM.