race fuel VS 91 octane.

[NightHawkFA5]

Does putting race gas in our SI's help performance or hurt it? My opinion Is that it doesnt help, if anything hurts performance. Please give me opinions and reasons!!!!

[FijiDeez]

From what I understand anything over your premium fuel from the pump is a waste of money. See definition of octane

The octane rating of gasoline tells you how much the fuel can be compressed before it spontaneously ignites.

Not so much related to performance.

EDIT. Oops.. didn't realize it was about race fuel. I guess the extra additives and whatnots could potentially give you more go. Don't know anything about all that jazz.

[DTNguyen107]

Urgh... I have search for 30 mins for this thread about additives and etc.

If I find it I'll post it up but what it says, it is not worth it.

They even tested those octane booster and engine enhancer or w/e. In reality it actually drop the performance 2-6%.

Don't waste a penny on those stuff.

[vtecmike1]

i think it would only help if you were boosted and or highly moddied NA.

and even then i would say if your boosted lets say comptech supercharged. 94octane is prob all you would need but 91 would be fine.

[klk15]

i read in a magazine about a turbo'd rsx type s and it had 450 whp with 91 octane but had over 600 using race fuel.... so i think maybe it gives you more power?

[chugiboi]

i'm not so myself.

what about this? will this help?
http://www.tuningracingcars27.com/im...ompetition.gif

[RAI]

Race fuel in a turbo car can make more power than pump gas, from my understanding, because your AF ratio will be 'safer' than when running pump gas, thus enabling you to turn your boost up without ending up leaning out.

In an all-motor/stock Si, you can damage your spark plugs.

[NightHawkFA5]

Yeah I happen to think that putting race fuel in your stock SI would be "mental HP" A buddy of mine told me that putting the race gas in our cars advances timing. I dont see how..... Oh and i dont mean octane boosters.

[Whocares05050]

Originally Posted by RAI

Race fuel in a turbo car can make more power than pump gas, from my understanding, because your AF ratio will be 'safer' than when running pump gas, thus enabling you to turn your boost up without ending up leaning out.

In an all-motor/stock Si, you can damage your spark plugs.

Your on the right track, but heres the correct info:

When you run race gas, you run it for one reason. The Higher octane in the fuel allows a tuner to lean the car out more when tunning it, to get more power out of the car. 93 octane pump gas is only good for so long before you start to detonate. the race fuel allows you to up the boost, and run slightly higher AFR's to get more power safely.

The race fuel wont really harm the spark plugs, but what it does harm quickly is your 02 sensors. Most race fuels are lead based, and will just eat em up, along with your cat converter. the majority of people who need / use race fuel have no 02 sensors, ( with the exception of AFR monitors ) and no cat convertors.

Unleaded race fuels below 116 octane will do nothing to help on a factory car, unless you have a piggy back / standalone unit allowing you to tune the car, and lean it out to make more power.

I hope i helped answer your questions.

[Whocares05050]

Originally Posted by NightHawkFA5

Yeah I happen to think that putting race fuel in your stock SI would be "mental HP" A buddy of mine told me that putting the race gas in our cars advances timing. I dont see how..... Oh and i dont mean octane boosters.

Hes misunderstood. by running race fuel, a tunner is able to advance timming becuase the higher octane will not pre-detonate as quickly as 93 pump fuel.

[andy22]

yes. bottom line is don't use race fuel in your Si until the ECU is cracked.

[NightHawkFA5]

Thank you all!!!! Please send a PM to redline8500 to let him know. He is hell bent that race gas Makes his SI quicker.

[melomood]

we have 93 here in NJ......

[slow4drsi]

Originally Posted by klk15

i read in a magazine about a turbo'd rsx type s and it had 450 whp with 91 octane but had over 600 using race fuel.... so i think maybe it gives you more power?

u don't just put race gas in your car and gain hp , u need to tune it , and even u can tune our car now u won't get much power out of it ,unless your boosting it or u got high comp pistons or nitrous....

[Whocares05050]

Originally Posted by NightHawkFA5

Thank you all!!!! Please send a PM to redline8500 to let him know. He is hell bent that race gas Makes his SI quicker.

Just a mental thing. If i paid 6 dollars a gallon for race fule, i would think it helped too.

[andy22]

If you really wanna go fast just pour some Rubbing Alcohol in your tank.

[Whocares05050]

Originally Posted by andy22

If you really wanna go fast just pour some Rubbing Alcohol in your tank.

[bulletSisedan]

Just a myth from the southwest, using higher octain gas in the heat helps the car run alot easier at higher rpms. I dont know if its fair to say it gains power but I definatly would say under certian conditions it would restore the power.

Thats just my own opinion and experiance....

[Whocares05050]

Originally Posted by bulletSisedan

Just a myth from the southwest, using higher octain gas in the heat helps the car run alot easier at higher rpms. I dont know if its fair to say it gains power but I definatly would say under certian conditions it would restore the power.

Thats just my own opinion and experiance....

Well heres why you may fell that way:

Under very hot conditions, when the vehicle is ran hard, the factory ECU will pull / retard the timming on the motor resulting in less power. Because of the higher octane, the vehicle's knock sensor may not pull back as much timming, resulting in better running conditions.

Anything over 100+ octane on a bolt on / stock SI is not worth it unless theres a tunning solution.