What Fuel Octane To Use?

Impackt · March 16th, 2007, 01:20 PM

What octane to use for my stock 88' 5.0?

94' Cobra 351 · March 16th, 2007, 01:56 PM

you could get away with running 87 octane if you really wanted.

it looks like the compression ratio in your car is the same as my 93' probe GT, which is around 9:1, and I ran 87 in there.

mdvaldosta · March 16th, 2007, 02:07 PM

87 is best unless you get pinging while running it, then maybe 89. It's best to go as low as possible, too much octane can hurt power and cause other issues long term.

Impackt · March 16th, 2007, 03:25 PM

I just got some 87 and drove around for a bit....no pinging at all.

I guess I'll stick with the 87.

whiteboycustom · March 16th, 2007, 04:00 PM

i use the 93, its what i use in my truck to, now for my honda 450r quad i run sunoco gt plus 104, thats the best dang gas i have found to run in it, the cleanest running by far

TENGRAM · March 16th, 2007, 04:09 PM

more octane means you can run more timing...more timing=more HP. go with as much octane and timing as you can afford. my2cents

mdvaldosta · March 16th, 2007, 04:48 PM

Precisely, though without more timing you're wasting money and probably power. My car lost 8hp on race gas until the timing was added. 4* timing made another 40hp.

Racinjason81 · March 16th, 2007, 06:45 PM

you want to run as close to detonation with out detonating.if you are not
pinging with 87 your fine.

1slo5.0 · March 16th, 2007, 11:26 PM

Originally Posted by Racinjason81

you want to run as close to detonation with out detonating.if you are not
pinging with 87 your fine.

True statement. Internal combustion engines are the most efficient when they are on the verge of detonation. But you can't tell some people that because they think "race gas" makes you go fast....

Tony_90fox · March 17th, 2007, 12:04 AM

is 93 octane at 14 degrees too much octane?

mikebert · March 17th, 2007, 12:08 AM

Originally Posted by Darrell

True statement. Internal combustion engines are the most efficient when they are on the verge of detonation. But you can't tell some people that because they think "race gas" makes you go fast....

Not that "race gas" doesn't have the potential for more power, but you can't just put the gas in there and expect wild power.

In order to get the most power from your gas, you need to match your timing to the potential of the octane used in your engine. Racing fuel will give you a little more power without modification, but to get the full benefit of racing fuel, you new to advance the timing. Advancing the timing gets the engine to burn the fuel in a manner that harnesses the most power possible (as Darrell said, right before detonation).

Of course, this applies to all levels of gas, 87 - 93 (ha!! never realized that before!!) and 103+ octane. The topic creator asked about a stock 88, which can get by with 87. But for anyone else out there who has a non stock 'stang, see how far you can go with octane and timing before detonation shows up.

mikebert · March 17th, 2007, 12:10 AM

Originally Posted by Tony_90fox

is 93 octane at 14 degrees too much octane?

Hell no. That sounds about right, if you want to keep that timing. You may be able to squeeze a little more timing out of there, but that's a safe setup.

Wait, what the fuck? Tony's just wasting our time. . ."too much octane"? From pump gas?

Tony_90fox · March 17th, 2007, 12:21 AM

well i just wanted to double check. Above said too much could end up hurting engine....But i was told that i had it right a long time ago, just wanted to check while we were on topic
I bet i could go up to 15-16 degrees. No pinging, it runs pretty good. I might try it tomorrow if i dont run into too much work already!

mikebert · March 17th, 2007, 12:31 AM

Yeah, I'd like some justification for that. At least some clarification between "running too much octane" and "not setting your timing to the amount of octane you're running."

I could come up with an argument about how running 103 octance at stock timing would hurt our engines, but maybe he had something else in mind.

TENGRAM · March 17th, 2007, 01:10 AM

FWIW my timing is set to 18* and i usually use 92, sometimes 93 octane. but every engine is different. only way to get it right is to test and tune

Countryboy_99 · March 17th, 2007, 02:00 AM

Hey for a stock 95' Mustang GT v8 5.0 Liter what fuel octane is recomended?

mikebert · March 17th, 2007, 02:10 AM

The cheapest thing that doesn't make you ping.

Countryboy_99 · March 17th, 2007, 02:15 AM

So just regular unleaded?

mikebert · March 17th, 2007, 02:17 AM

Sure, if you get away with it. If you're all stock then you shouldn't have a problem.

Countryboy_99 · March 17th, 2007, 02:54 AM

ok sweet and thx

March 16th, 2007, 01:20 PM	#1
Impackt Newbie Join Date: Nov 2006 Posts: 2 iTrader: 0 reviews	What Fuel Octane To Use? What octane to use for my stock 88' 5.0?

March 16th, 2007, 04:00 PM	#5
whiteboycustom El Conquistador 83 coupe Join Date: Feb 2007 Location: vidor,texas Posts: 1,149 iTrader: 0 reviews	i use the 93, its what i use in my truck to, now for my honda 450r quad i run sunoco gt plus 104, thats the best dang gas i have found to run in it, the cleanest running by far __________________ http://www.donttearmedown.com/

March 16th, 2007, 04:09 PM	#6
TENGRAM Hardcore Enthusiast Join Date: Jun 2006 Posts: 1,027 iTrader: 0 reviews	more octane means you can run more timing...more timing=more HP. go with as much octane and timing as you can afford. my2cents __________________ 89 GT t5 3.73 www.my5oh.com/

March 16th, 2007, 06:45 PM	#8
Racinjason81 Hardcore Enthusiast Join Date: Feb 2007 Location: New jersey Posts: 1,559 iTrader: 0 reviews	you want to run as close to detonation with out detonating.if you are not pinging with 87 your fine. __________________ Heres a real funny video youtube.com/watch?v=ojB7KkaR03I VTEC stands for Very Torqueless Economy Car Honda stands for Hold On Not Done Accelerating 1991 LX 5.0 H/B(T-70 turbo coming soon)

March 17th, 2007, 12:04 AM	#10
Tony_90fox Banned Join Date: Jun 2006 Location: Bowling Green, KY Posts: 3,803 iTrader: 0 reviews	is 93 octane at 14 degrees too much octane? __________________ [SIGPIC][/SIGPIC] [B][U]MM Sapper Squad[/U][/B] [QUOTE=Regency 2007;1676187]MSO's stupidity has never stopped amazing me since the day he joined this forum.[/QUOTE]

March 16th, 2007, 01:56 PM	#2
94' Cobra 351 Regular Join Date: Dec 2006 Posts: 480 iTrader: 0 reviews	you could get away with running 87 octane if you really wanted. it looks like the compression ratio in your car is the same as my 93' probe GT, which is around 9:1, and I ran 87 in there.

March 16th, 2007, 02:07 PM	#3
mdvaldosta MM Fanatic 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,940 iTrader: 0 reviews	87 is best unless you get pinging while running it, then maybe 89. It's best to go as low as possible, too much octane can hurt power and cause other issues long term.

March 16th, 2007, 03:25 PM	#4
Impackt Newbie Join Date: Nov 2006 Posts: 2 iTrader: 0 reviews	I just got some 87 and drove around for a bit....no pinging at all. I guess I'll stick with the 87.

March 16th, 2007, 04:48 PM	#7
mdvaldosta MM Fanatic 2002 Mustang GT 11.47@120.58 Join Date: Aug 2005 Location: Valdosta, GA Posts: 3,940 iTrader: 0 reviews	Precisely, though without more timing you're wasting money and probably power. My car lost 8hp on race gas until the timing was added. 4* timing made another 40hp.

March 17th, 2007, 12:21 AM	#13
Tony_90fox Banned Join Date: Jun 2006 Location: Bowling Green, KY Posts: 3,803 iTrader: 0 reviews	well i just wanted to double check. Above said too much could end up hurting engine....But i was told that i had it right a long time ago, just wanted to check while we were on topic I bet i could go up to 15-16 degrees. No pinging, it runs pretty good. I might try it tomorrow if i dont run into too much work already! __________________ [SIGPIC][/SIGPIC] [B][U]MM Sapper Squad[/U][/B] [QUOTE=Regency 2007;1676187]MSO's stupidity has never stopped amazing me since the day he joined this forum.[/QUOTE]

March 17th, 2007, 12:31 AM	#14
mikebert Enthusiast Join Date: Oct 2006 Location: Augusta, GA Posts: 906 iTrader: 0 reviews	Yeah, I'd like some justification for that. At least some clarification between "running too much octane" and "not setting your timing to the amount of octane you're running." I could come up with an argument about how running 103 octance at stock timing would hurt our engines, but maybe he had something else in mind.

March 17th, 2007, 01:10 AM	#15
TENGRAM Hardcore Enthusiast Join Date: Jun 2006 Posts: 1,027 iTrader: 0 reviews	FWIW my timing is set to 18* and i usually use 92, sometimes 93 octane. but every engine is different. only way to get it right is to test and tune __________________ 89 GT t5 3.73 www.my5oh.com/

March 17th, 2007, 02:00 AM	#16
Countryboy_99 Enthusiast '95 GT Was probably faster before I got it. Join Date: Feb 2007 Location: Wichita, Kansas Posts: 861 iTrader: 0 reviews	Hey for a stock 95' Mustang GT v8 5.0 Liter what fuel octane is recomended? __________________ Its red, long, and comes with an 8 foot bed attached. Wanna come play with it?

March 17th, 2007, 02:10 AM	#17
mikebert Enthusiast Join Date: Oct 2006 Location: Augusta, GA Posts: 906 iTrader: 0 reviews	The cheapest thing that doesn't make you ping.

March 17th, 2007, 02:15 AM	#18
Countryboy_99 Enthusiast '95 GT Was probably faster before I got it. Join Date: Feb 2007 Location: Wichita, Kansas Posts: 861 iTrader: 0 reviews	So just regular unleaded? __________________ Its red, long, and comes with an 8 foot bed attached. Wanna come play with it?

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March 17th, 2007, 02:17 AM	#19
mikebert Enthusiast Join Date: Oct 2006 Location: Augusta, GA Posts: 906 iTrader: 0 reviews	Sure, if you get away with it. If you're all stock then you shouldn't have a problem.

March 17th, 2007, 02:54 AM	#20
Countryboy_99 Enthusiast '95 GT Was probably faster before I got it. Join Date: Feb 2007 Location: Wichita, Kansas Posts: 861 iTrader: 0 reviews	ok sweet and thx __________________ Its red, long, and comes with an 8 foot bed attached. Wanna come play with it?

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