There are a lot of things to look at besides the octane of a fuel. Its possible to have a fast burn rate and high octane. Most on this board are so far off on their tune they are just better off using the highest octane they can get to avoid detonation. I read at least on thread a week where the underlying problem was too little octane and or poor tune. Never seen proof in a thread that too much octane hurt performance. Its possible on certain types of engines that are at the limit of their performance due to the restrictions they have like in roundy round racing. Having the highest BTU possible and not having detonation will be an advantage since BSFC will be less. They dont allow a lot of oxygenation either. Whenever someone asks me how much octane i tell them as much as possible. If they had to ask that question then they are no where near skilled enough to even try running an engine on the edge. Not worth scrimping on octane.
meth with 89 or below octane?
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There are a lot of things to look at besides the octane of a fuel. Its possible to have a fast burn rate and high octane. Most on this board are so far off on their tune they are just better off using the highest octane they can get to avoid detonation. I read at least on thread a week where the underlying problem was too little octane and or poor tune. Never seen proof in a thread that too much octane hurt performance. Its possible on certain types of engines that are at the limit of their performance due to the restrictions they have like in roundy round racing. Having the highest BTU possible and not having detonation will be an advantage since BSFC will be less. They dont allow a lot of oxygenation either. Whenever someone asks me how much octane i tell them as much as possible. If they had to ask that question then they are no where near skilled enough to even try running an engine on the edge. Not worth scrimping on octane.
Thats just it. Very low % of members on this forum can even optimize with high octane. Therefore they fail with low octane before they ever optimize.
I have seen cars lose power with C16 and methanol injection. TSM car that lost .2 tenths. He went to 108 and the methanol and the power came back on. So too much octane can be an issue if you dont have the BBQ to cook it
In general terms, if anyone asks me how much octane they need.. I too say as much as possible. Your better off having more than too little and possibly hurt something.
I have seen cars lose power with C16 and methanol injection. TSM car that lost .2 tenths. He went to 108 and the methanol and the power came back on. So too much octane can be an issue if you dont have the BBQ to cook it
In general terms, if anyone asks me how much octane they need.. I too say as much as possible. Your better off having more than too little and possibly hurt something.
He should have ran Q16 with the methanol or turned the timing up 2 degrees and a psi or 2 more and id bet $ he would pick up even with a slightly fat tune. Timing makes a big difference in a TSM combo since the backpressure is so damn high.
this was on Richie's car. he ran 9.5 with 108 and meth, 9.7 on the C16. We dont have access to Q16 here readily. maybe could of run better, he was experiencing popping/fluttering. The car latter ran 9.3 on C16.. its just what happens on a particular day with a particular tuneup and its circumstances.
What works on one persons car may not on someone else's..
Turbo6Smackdown
Well-Known Member
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Call the tech at VP racing fuels, and you'll see.
I asked this question, and we spoke on it for about 45 minutes straight. It's a match, that...well.... has to be matched! lol. Too much octane won't HURT your engine, but it DEFINITELY will hurt performance. Of course, I know you're right about the majority's tune being way off, thus requiring the huge safety net of pure race fuel... Too much is indeed better than too little.
TURBOPOWERED68
David
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good read
thanks
thanks
Alaskabuick
Member
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- 699
90 octane
I run 90 octane with Razors alky kit on my modded car.
26 lbs of boost at 22 deg timming all day long no knock.
However we do have dry cool air here.
Den
I run 90 octane with Razors alky kit on my modded car.
26 lbs of boost at 22 deg timming all day long no knock.
However we do have dry cool air here.
Den
tested the 87 and alky and the 93 vs alky at the track with no gain in performance.years ago ran many different types of fuels on my 49 car c16 was the slowest,with the 100 unleaded being the fastest,boost range was 22 to 24psi timing ranged 20 to 26 degrees.car ended up going faster on pump gas alky
