DrewGS4

Has anyone used racing fuel in the GS. I think the 100 octane would be the best for the stock GS. Is there a big improvement in engine performance? Thought about filling her up this weekend with some race fuel and having a little fun. Or is this a bad idea!


Here is some typical race fuels.

76 PRODUCTS/TOSCO CORPORATION

Competition 100

Competition 100 (unleaded) is designed for high performance street cars, race cars, watercraft, motorcycles, etc. In fact, engines with compression ratios as high as 14:1 will benefit greatly from this clean-burning fuel.

Competition 110

Competition 110 (leaded) is formulated for racing engines with compression ratios as high as 16:1. It has an additive package to keep carburetors clean and controls surface ignition for maximum performance.

Superstock 114

Superstock 114 (leaded) is formulated for high compression big-block and small-block racing engines. It’s designed for normally aspirated, supercharged or turbocharged racing engines.

Prostock 118

Prostock 118 (leaded) is designed for supercharged and turbocharged racing engines, pro stock racing engines with compression ratios exceeding 16:1 and pro stock motorcycle engines with compression ratios exceeding 17.5:1.

joshoowa

iTrader: (1)

i've never done it....but thats some great information u provided

JellyBean

Unleaded racing fuel won't harm your engine, but it'll be a waste of money. 100 octane fuel is designed for higher compression engines--higher compression that in your stock Lexus. But go ahead and try it. It won't hurt anything.

That said, LEADED fuel (racing or non-racing) will ruin your catalytic converters. Don't try that one.

Have fun.

JB

morris

iTrader: (2)

There wont be any benefit to running racing gas. The only reason they run it is to eliminate detonation, which is caused when having higher compression or high boost levels. Hi octane gas is more resistant to detonation.

chuckb

sometimes, with low compression, race gas can make a car slower. something about race gas burns slower. our cars are 10.5 to 1, which is not that low. many V8s are 9 to 1.

DaveGS4

iTrader: (2)

Waste of money unless you have high compression or FI (primarily turbo with controller, or supercharger tuned for it) to take advantage of it.

The leaded stuff will clog your cats in very short order

LMSguy

Heres how it works.
What is commonly called detonation is technically called pre ignition.
See the higher the octane rating of the fuel the slower it burns.
On a high compression engine or a Forced induced engine the cylinder pressure and heat are greater/higher, and what happens is the fuel is ignited before it is suppossed to.Hence the name pre ignition.
So that is the reason why high octane race fuel is used.
It does not make any more power than regular gas, and if it is not needed it can cause the burn rate to be slowed too much and possibly affect the timing in a negative way.
There is absolutley no need for anything more than premium gas,even in the force inducted cars unless they are making BIG boost and tuned for the higher octane gas.
There is more to it,but I hope this clarifies it a bit.

rominl

iTrader: (4)

for those who can get 93 gas then it's probably a waste of money. for those of us who are getting crappy 91 here, i haev known couple of guys who's getting smoother runs by adding a little bit of 100 with mostly 91

aloha08isf

iTrader: (2)

definitely!! running race gas must be soo expensive after a while...even 92 octane gas (premium) here is like 2.50+...$50 for full tank to fill up the gs

DrewGS4

Thanks guys for your thoughts. So its a big waste of money to put in the race fuel. WIll stick to the 93 premium from mobile/exxon.

I was planning on going down to the track this weekend with some of my mustang friends. Wanted to get some times on my GS and wanted every possible edge.
I think I will wait to get my 75k mile service done and tweak my suspension a bit before heading down there.

LEXUS_KID

iTrader: (4)

I'm sure maybe half a gallon or one gallon wouldn't be a waste just like adding a fuel octane booster to the system.

morris

iTrader: (2)

Octane booster is a waste also if it boosts the octane higher than the cars engine really needs. But hey people buy 93 octane all the time when they really only need 89 octane

Fisher503

Drew I have used the Sunoco 100 octane. Definitely feel the difference. It lasted almost twice as long as my usual fill up of Sunoco 94 and I was getting on the car alot more than usual. I would give it a try if I were you , I sure you have wasted alot more on your car then some racing fuel.

WhiteTiger

I would have to agree with this. One time I used 100 octane and did notice a difference in the performance of my slightly modded GS 430 (intake/exhaust) . Normally I run 93 octane and when I used the 100 octane the car was definitely quicker and ran smoother. I understand what some of the naysayers are saying and logically, it makes sense. But the bottom line is that I did notice the improved performance.

LsportGS4

Its deff not worth the price that it is to fill up in race fuel....