Just a quick question...I was wondering what is better to use all the time in my 86 TPI...89 octane or 93? I have been using 93 for as long as i can remember...but the last two times i have filled up, I have used 89(heard it was good for long distance driving)....so which is better and for what? Looking for some opinions and advice...thanks...

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1986 WS6-Equipped 5.0 TPI Trans Am
Random Tech High-Flow Cat
Two Chamber Flowmaster Muffler
Megs Custom 4.5" Stainless Steel Rolled Tips
1999 Grand Am GT In-Dash CD Player w/Equalizer(fits like '86 original)
5% Tint On Rear, 35% On Sides
http://www.pitt.edu/~zyhst/trans86/

OTHER RIDE:
1998 C5 6Spd. Corvette Coupe
Silver w/Gray Leather Int.
12/14 Options
Stock(for now)
Best 1/4th: 13.5 @ 104.4MPH

 

[This message has been edited by PhantomTPI (edited May 18, 2001).]

 

Heck, unless you're advancing the timing past stock spec's, you'll do just as good with 87.

 

I am running the timing at 8* and with the price of gas I have been running 89 octane with out any problems. Now if I were going out to have some fun I would put in the 93 but for every day driving 89 is working for me.

 

As long as you don't have a high compression engine(12:1)then use it.

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89 IROC 350 Auto
Custom DUAL Exhaust
Edelbrock Performer 6085 Aluminum Heads
ZZ9 Cam
TPIS Level 5 Chip
And Free mods.
[b]
Moderator of http://www.iroczone.com

Member of JFA Crew

 

Thanks everyone. The only mods i have done is exhaust and i will do a cold air intake, so nothing major. I guess 89 is good enough. Thanks again.

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1986 WS6-Equipped 5.0 TPI Trans Am
Random Tech High-Flow Cat
Two Chamber Flowmaster Muffler
Megs Custom 4.5" Stainless Steel Rolled Tips
1999 Grand Am GT In-Dash CD Player w/Equalizer(fits like '86 original)
5% Tint On Rear, 35% On Sides
http://www.pitt.edu/~zyhst/trans86/

OTHER RIDE:
1998 C5 6Spd. Corvette Coupe
Silver w/Gray Leather Int.
12/14 Options
Stock(for now)
Best 1/4th: 13.5 @ 104.4MPH