petrol

GTP SUPERCHARGED · #1 10-14-2005, 07:29 PM

It says that im supposed to run 91 octane through my 98 gtp, do i have to, and what happens if i dont??

Ripn12s · #2 10-14-2005, 07:37 PM

Im surprised it doesnt say to only run 93 octane.

If your stock I would think that 91 would be ok. I run 89 octane in mine during the week for work. I aslo realize that when Im running 89 that I'm see around 5 to 7 degs of Knock Retard so I know not to beat the shit out of the car.

GTP SUPERCHARGED · #3 10-14-2005, 08:00 PM

Quote:

Originally Posted by Ripn12s

Im surprised it doesnt say to only run 93 octane.

If your stock I would think that 91 would be ok. I run 89 octane in mine during the week for work. I aslo realize that when Im running 89 that I'm see around 5 to 7 degs of Knock Retard so I know not to beat the shit out of the car.

So do you think it would be to hard on my engine if i ran 89 octane just for running to work as long as im not drivin it to hard, and than if im gonna go runnin around racing on the weekends or whatever i put in some 91 or 93?

BigBL87 · #4 10-14-2005, 09:33 PM

Quote:

Originally Posted by GTP SUPERCHARGED

So do you think it would be to hard on my engine if i ran 89 octane just for running to work as long as im not drivin it to hard, and than if im gonna go runnin around racing on the weekends or whatever i put in some 91 or 93?

Even just going to work, it won't be good for your engine. That doesn't mean you can't, but it will just take some life time off of your engine. If you're planning on the car lasting you a while, I'd just run 91 or 93. I own a GT myself, so I don't know from personal experience, thats just what I've heard...

BNaylor · #5 10-15-2005, 10:53 AM

Curtis, could you give us a list of mods you already have. What pulley size are you running on the supercharger?

Thrasher CAI, DHP v1.0 PCM, SLP Headers,
3.25 SC pulley, CAIT GMAF, 2.5 DP/Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials
1/4 ET: 13.210 sec. @ 104.490 mph
0 - 60 ft: 1.945 sec.

GTP SUPERCHARGED · #6 10-15-2005, 05:31 PM

I just barely bought the car on monday, and the guy said it has 3.0 pulleys but i dont think thats true i think it is completely stock as of right now!

Ripn12s · #7 10-15-2005, 06:48 PM

Measure the pulley. People have been known to just throw on a small pulley and think thats it.

GTP SUPERCHARGED · #8 10-15-2005, 07:44 PM

its a 3.8.... so it is stock the guy doesnt kno what he is talking about apparently

BNaylor · #9 10-16-2005, 09:52 AM

You'll be OK Curtis. Just go with your original battle plan. Even Rip uses mid-grade whenever he can get away with it. Personally, I use preminum only in my GTP. Better safe than sorry. When gas was over $3/gal I used mid-grade in my Regal GS (same L67 as GTP) but switched back because I lost fuel mileage. Good luck!

Thrasher CAI, DHP v1.0 PCM, SLP Headers,
3.25 SC pulley, CAIT GMAF, 2.5 DP/Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials
1/4 ET: 13.210 sec. @ 104.490 mph
0 - 60 ft: 1.945 sec.

richtazz · #10 10-17-2005, 04:26 PM

I agree with Bob's statement, the trade off in crappy mileage isn't worth the cheaper per gallon cost.

Ripn12s · #11 10-17-2005, 10:25 PM

I dont see any differnce in mileage between a tank of 93 and a tank of 89. always see about 22mpg (hwy)

BNaylor · #12 10-18-2005, 06:17 AM

We might check to see what fuel quality he has available in his area. In my area all we have is 88 for mid-grade and 91 for premium. I believe he lives in Arizona. Just my 2 cents.

Thrasher CAI, DHP v1.0 PCM, SLP Headers,
3.25 SC pulley, CAIT GMAF, 2.5 DP/Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials
1/4 ET: 13.210 sec. @ 104.490 mph
0 - 60 ft: 1.945 sec.

GTP SUPERCHARGED · #13 10-18-2005, 09:43 AM

Yeah i live in Arizona, we got 89 mid-grade and 91 premium.

BNaylor · #14 10-18-2005, 10:00 AM

Quote:

Originally Posted by GTP SUPERCHARGED

Yeah i live in Arizona, we got 89 mid-grade and 91 premium.

Custis, why don't you repeat what you told me as to how you plan on running or switching between the mid-grade and premium. Something about mid-grade during the work week and premium when you're ready to show off or get it on during the weekends?

Then we can all weigh-in again.

Thrasher CAI, DHP v1.0 PCM, SLP Headers,
3.25 SC pulley, CAIT GMAF, 2.5 DP/Hi-Flow CAT,
u-bend delete, 160 TS, ZZP Stage 1 72mm TB,
TB spacer, MSD 8.5mm wires, Autolite 103,
Goodyear Gatorback Serp. & SC Belt,
Nitto NT555R Drag Radials
1/4 ET: 13.210 sec. @ 104.490 mph
0 - 60 ft: 1.945 sec.

GTP SUPERCHARGED · #15 10-18-2005, 10:04 AM

I just figured i since during the week i probly wont be driving it more than 20 miles a day or so to and from work why not save a little money with 89, than when it hits thursday or so ill make sure to put some higher grade in so i can go show my car off to all the little ricers that think there fast! And eventually after i get some mods done, i might hit the tracks! I have just been putting 91 in cuz i wasnt sure how bad it would be on my engine.

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