100 Octane In 2004 GT
11-04-2009, 03:59 PM
#1
1st Gear Member
Thread Starter
Join Date: Oct 2009
Location: ca
Posts: 114
100 Octane In 2004 GT
Does anyone have experience using 100 octane unleaded in their street car? I'm racing this Friday at Racelegal.com in San Diego and was planning on running my gas tank down to near empty then put in 6 gallons, or so, of 100 octane to run at the races. What do you think?........
11-04-2009, 05:52 PM
#5
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
Umm. sort of, maybe, not really...
Octane History 101
As to the OP, unless you tune for it it will do nothing, and may actually cost you power...
Octane History 101
As to the OP, unless you tune for it it will do nothing, and may actually cost you power...
11-04-2009, 05:53 PM
#6
1st Gear Member
Thread Starter
Join Date: Oct 2009
Location: ca
Posts: 114
Everything that I've read on this subject says that no harm will come to either the engine or the exhaust system. However, even though it won't hurt, it won't benefit the car either; unless there's knock. What I do know, is that I'm quite a bit faster when drag racing (legally) with 91 octane than I am when using 87 octane. I don't have a tune, it's stock.
11-04-2009, 06:41 PM
#7
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
Everything that I've read on this subject says that no harm will come to either the engine or the exhaust system. However, even though it won't hurt, it won't benefit the car either; unless there's knock. What I do know, is that I'm quite a bit faster when drag racing (legally) with 91 octane than I am when using 87 octane. I don't have a tune, it's stock.
Other than that it's not bad...
11-05-2009, 11:50 AM
#9
Join Date: Sep 2009
Location: Gulf Coast
Posts: 13
100 Octane
Yes I use 100-octane fuel a lot to boost my octane, or help when the vehicle is under load. When I do this I actually get better mileage, and the vehicle runs better. I know that being in California you can only fill up on 91, I have some friends that live out there, and they have been mixing in 100 octane fuel to make 93 94 octane fuel this is the whole reason I found out about it. As far as racing you forget that racing fuel is not made in the same way that street gas is. The chemistry is different, and what the fuel is designed to do is different. I have been using a 100 octane unleaded street legal racing fuel called Street Blaze 100 for some time now. The car has more power and a lot more torque. Just make sure that whatever you are going to use is unleaded or you will damage your cats and o2 sensors.
11-05-2009, 12:28 PM
#10
4th Gear Member
Join Date: May 2008
Location: NJ
Posts: 1,236
Higher octane prevents detonation, it's necessary for more timing and for boosted applications. If you don't have the tune for it, it's not doing you much good. If you want a little safety, all I do is add a bottle of octane upper before I hit the track. I only do that though because I have a tune with a bit more timing for 93 octane and feel safer adding that to my 93 before I race.
