Gas octane

ByPopularDemand · May 3rd, 2007, 05:01 PM

Ok so I know as fas as pump gas you dont need premium unless your tuned for it. So if you do have a premium tune would race gas be beneficial at all

2000Si · May 3rd, 2007, 05:28 PM

I'm not sure what you mean by premium tune, but premium gas is for Forced induction and/or higher compression ratio engines. (9.8:1) is where I'd switch from 87 or 89 to at least 91 octane.

If you have the timing pulled back really far, or have it advanced very far, it wouldn't hurt to run premium to reduce the chance of pre-detonation.

Juggalo_X · May 3rd, 2007, 05:59 PM

Originally Posted by 2000Si

I'm not sure what you mean by premium tune, but premium gas is for Forced induction and/or higher compression ratio engines. (9.8:1) is where I'd switch from 87 or 89 to at least 91 octane.

If you have the timing pulled back really far, or have it advanced very far, it wouldn't hurt to run premium to reduce the chance of pre-detonation.

im running 91 octane with a tune for it and my timing advanced by 3 degrees and its running smoother better and more powerful then ever. also has better fuel millage

tomzac · May 3rd, 2007, 06:12 PM

Originally Posted by ByPopularDemand

Ok so I know as fas as pump gas you dont need premium unless your tuned for it. So if you do have a premium tune would race gas be beneficial at all

No. Higher octane means the spontanious flash point of the fuel has been raised. It does nothing to add power. What it does is allow you to add more spark before preignition (spark knock). What's where you get the power. Typically you add spark for power and pull spark for fuel economy. Ideally you want to run the lowest octane you can without creating a situation for preignition.

ByPopularDemand · May 3rd, 2007, 06:23 PM

Well its tuned for 91 now and thats what ive been running

Juggalo_X · May 4th, 2007, 11:07 AM

Originally Posted by ByPopularDemand

Well its tuned for 91 now and thats what ive been running

any octane higher then ur tune wont burn 100% efficient

GreenFaleen · May 4th, 2007, 12:44 PM

higher octane is never beneficial unless you are tuned for it and 25 bucks a gallon for race fuel is not worth it.

tomzac · May 4th, 2007, 04:22 PM

Originally Posted by Juggalo_X

Originally Posted by ByPopularDemand

Well its tuned for 91 now and thats what ive been running

any octane higher then ur tune wont burn 100% efficient

The octane rating is merely a measurement at which autoignition occures and has nothing to do with heat efficiency.

punkafi888 · May 5th, 2007, 03:18 PM

ok i got one to add here, i am hitting the track on the 30th. i have no tune. would it be worth it to put prem in my car?

GreenFaleen · May 5th, 2007, 04:10 PM

Originally Posted by punkafi888

ok i got one to add here, i am hitting the track on the 30th. i have no tune. would it be worth it to put prem in my car?

no

punkafi888 · May 6th, 2007, 02:16 AM

thank you faleen, you never seeze to amuse me! and you just saved me a few bux

itschristorres8 · May 6th, 2007, 09:30 PM

race gas is usually considered about 110 around here. you deffinitly need a tune and time for the to be benificial

May 3rd, 2007, 05:01 PM	#1
ByPopularDemand Hardcore Enthusiast 2000 V6 Join Date: Jan 2007 Location: Albuquerque Posts: 2,670 iTrader: 0 reviews	Gas octane Ok so I know as fas as pump gas you dont need premium unless your tuned for it. So if you do have a premium tune would race gas be beneficial at all __________________ 2000 V6 vert Mac LT headers, Mac O/R H-pipe, Mac CAI, ASP 25% underdrive pulley(r.i.p), SCT tune, 8.8 rear and 4.10 gears.

May 3rd, 2007, 06:23 PM	#5
ByPopularDemand Hardcore Enthusiast 2000 V6 Join Date: Jan 2007 Location: Albuquerque Posts: 2,670 iTrader: 0 reviews	Well its tuned for 91 now and thats what ive been running __________________ 2000 V6 vert Mac LT headers, Mac O/R H-pipe, Mac CAI, ASP 25% underdrive pulley(r.i.p), SCT tune, 8.8 rear and 4.10 gears.

May 4th, 2007, 12:44 PM	#7
GreenFaleen MM's Resident Ricer 2006 Scion tC 13.001@113 Join Date: Nov 2006 Location: Raleigh/Lenoir, NC Posts: 9,906 Blog Entries: 2 iTrader: 1 reviews	higher octane is never beneficial unless you are tuned for it and 25 bucks a gallon for race fuel is not worth it. __________________ Scion Tc Turbo - 9psi 297whp 287wtq 2500lbs :p MM 4 Banger club: Senior Ricer NCMM #9 "Horsepower sells cars, torque wins races." -Carroll Shelby

May 5th, 2007, 03:18 PM	#9
punkafi888 Regular Join Date: Jan 2007 Posts: 294 iTrader: 0 reviews	ok i got one to add here, i am hitting the track on the 30th. i have no tune. would it be worth it to put prem in my car? __________________

May 6th, 2007, 02:16 AM	#11
punkafi888 Regular Join Date: Jan 2007 Posts: 294 iTrader: 0 reviews	thank you faleen, you never seeze to amuse me! and you just saved me a few bux __________________

May 3rd, 2007, 05:28 PM	#2
2000Si Enthusiast Join Date: Aug 2005 Location: In my house. Posts: 997 iTrader: 0 reviews	I'm not sure what you mean by premium tune, but premium gas is for Forced induction and/or higher compression ratio engines. (9.8:1) is where I'd switch from 87 or 89 to at least 91 octane. If you have the timing pulled back really far, or have it advanced very far, it wouldn't hurt to run premium to reduce the chance of pre-detonation.

May 6th, 2007, 09:30 PM	#12
itschristorres8 Banned 00 V6 & 09 GT 13.37@104.4mph--BONE stock GT Join Date: Aug 2006 Location: south florida Posts: 15,859 iTrader: 2 reviews	race gas is usually considered about 110 around here. you deffinitly need a tune and time for the to be benificial __________________ [SIGPIC][/SIGPIC] Acmillr loves me

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Gas octane

Gas octane

Re: Gas octane