Race fuel

Darren05 · 10-02-2009, 09:17 PM

If someone does a tune for it, can we run race fuel in our cars? I'm not sure what the octane level is for race fuel, 104 or 106 octane? Just curious.

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.boB · 10-02-2009, 10:05 PM

Race fuel varies, 100-112 is the general range; although you can find higher if you really need it. Available in leaded and unleaded.

But, do you really need it? With hi9gher octane you can run a bit more timing. THat doesn't always mean more power though. You'll have to run it on the dyno to find out.

If you've installed a big cam that builds a lot of cylinder pressures, then more octane is a must. Otherwise you'll be breaking ring lands.

mygt500 · 10-03-2009, 12:40 AM

I agree with bob above....unless you have a high HP application and want to run more timing there is no point in running race fuel...it can be done....yes but those with FI and other power adders that increase cylinder pressure and want a safer custom tune can and have been known to use it. I have 3 tunes.....one for street, one for race/track-race fuel, and a valet tune....not that the car ever gets driven by anyone other then myself

Simon1 · 10-03-2009, 01:42 AM

Most of the people I know who have used the race fuel use either C16 (leaded 116 octane) or 100 unleaded. More octane means more timing and more fuel which will translate into more power. However, those with the stock motor can acheive their max potential without any 100 oct.

You will need specific tuning for the 100 octane.

Depending on how much I add to the turbo, I can add 5-7 degrees of timing at the track. It makes the biggest difference on the lower end of my powerband with the turbo.

If I run my base tune at the track I will usually add a little 100 oct due to high heat issues up here in Nor. Cal.

forensicsteve · 10-04-2009, 09:49 PM

We run C16 only. Car has been pulled from street duty, so never going back to 93...but who would want to pay $11+ a gallon to run just race fuel for a daily.

Steve O Chap · 10-04-2009, 10:09 PM

I've run race fuel in my car (while on the 93 tune) one time at the track, just for the heck of it... I think the car felt a LITTLE peppier, but it was pretty much a waste of money.

Now in my old race bikes, race fuel was awesome... :-)

bronco78 · 10-05-2009, 06:25 AM

Race fuel has another advantage besides being available in higher octane or with lead.. It is much more consistent can to can.
The gallon of Vp U4 you get today will be the same as you get 3 months from now. Not true for the gallon of 93 you get from Texaco today and the gallon you get next month.
Stability and consistency why I run it in my bikes, Jetting is much easier with a consistent fuel.

In a daily driver, that needs to run a consistent time (bracket) I can see an advantage to picking a race fuel (does not have to be a high Oct version.. MotorSport 109™ or Street Blazer100 are two) having a dyno tune and then upload that tune for track days. You would eliminate one more variable from the driver / machine combo that folks battle everyday at the track.