Jamal302
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Sep 20, 2025
- Join DateAug 2020
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What do you use on the track, and does it perform better for you than pump gas?
I've been using 93 octane pump, and have only noticed it pulling timing when on track temps are 100+. Originally Posted by cujet
Fuel quality and octane play a role in many modern engines. I do get better performance on my Stage 1 V6s with a higher octane fuel. I had a few jugs of VP C9 (non oxygenated, no ethanol, 95-96 octane unleaded) left over from my motorcycle projects, and the car seems to really like it. I did not dyno test it or race it. Just driving my normal route. But SOTP (seat of the pants) tells me it's better.What do you use on the track, and does it perform better for you than pump gas?
I'll check to see if the race fuel they have at the track is leaded or not.
I am running sports cats, but I am thinking leaded would still foul them.
I may see if I can source a jug of 100 octane unleaded to see if that makes a difference when I sign up for my next track day.
If we can get some dry laps in, in the morning I am hoping to hit 150 on the front straight. Current peak speed is 144.
While it may not matter for the Jag, there are very few high octane unleaded fuels (you must use unleaded due to O2 sensor fouling) that are non oxygenated. In general, high octane unleaded fuels contain ever higher ethanol content.
VP C9 96 octane (sometimes listed as 95)
Sunoco Optima 95 octane
SunocoŽ 260 GTX 98 octane, which is a very special "260" as ALL of the other 260's are highly oxygenated.
In general, I tend to like non oxygenated race fuels for the consistent excellent performance and very, very long shelf life.
VP C9 96 octane (sometimes listed as 95)
Sunoco Optima 95 octane
SunocoŽ 260 GTX 98 octane, which is a very special "260" as ALL of the other 260's are highly oxygenated.
In general, I tend to like non oxygenated race fuels for the consistent excellent performance and very, very long shelf life.