petrol

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

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.

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?

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...

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







http://i5.photobucket.com/albums/y186/lizzywiz/gtp.jpg
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.

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!

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

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

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!







http://i5.photobucket.com/albums/y186/lizzywiz/gtp.jpg
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.

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

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

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. :2cents:







http://i5.photobucket.com/albums/y186/lizzywiz/gtp.jpg
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.

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

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? :dunno:

Then we can all weigh-in again. :lol2:






http://i5.photobucket.com/albums/y186/lizzywiz/gtp.jpg
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.

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.

Hi Guys
Just curious as to what the price of fuel is in your areas. I live in Northern Ontario, Canada. (not that far north tho, I Can look across the river and see Sault Ste Marie .Michigan ) I had a little chuckle when I read Bob`s post here (when gas was over $3/gal). I wish I only paid $3 / gal. Heck I`d even put Premium in my riding mower if I only paid that much....LoL. Today Premium gas is selling for $ 5.18 /gal . regular unleaded is $4.72 /gal. Now some of you guys may know that the U.S gallon is is smaller than the Imperial gallon ,which is what we use in Canada. We also have the good old metric system of measurement so we buy our fuel by the litre. The U.S gallon is Approx. 3.8 litres , Canadian is 4.5 litres. I have converted and figured using the U.S. gallon and gas for you guys and the price would be premium $4.36/gal and regular $3.99. Just curious .This a Great site and some of You Guys are Very Knowledgeable ,very good info. I am very impressed and enjoy reading the forum.
Don

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.

You need to look at whats practical. Although it doesn't hurt mixing the two different grades it sounds like a PITA. Here's a hypothetical....lets say you're cruising down or up I-10 on the way home from work and one of those Ricers eggs you on. What are you going to do if you're running the mid-grade?

And what are we talking about, a 10 cents per gallon difference bewteen mid-grade and premium. 1 dollar on 10 gallons? Skip a lunch at Micky D's or Burger King and you'll make up the difference.

Not all GTPs are created equally. You'll never really know what difference it will really make until you hookup an auto scanner with knock retard (KR) readout or run a program like Autotap.

It the meantime it's better safe than sorry.






http://i5.photobucket.com/albums/y186/lizzywiz/gtp.jpg
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.

Gas prices here in Flint, MI are down to $2.46/gal for 87 octane regular, $2.54 for 89/91 octane mid-grade and $2.64 for 93 octane premium.

We're at a current low of $2.49/gal at Walmart/Murphy's for reg. unleaded.

However, name brands such as Chevron or Shell are around $2.63/gal for 87 oct. reg. unleaded. $2.73 mid-grade (88 oct) and $2.83 for premium (91 oct).

If we had to pay similar prices like in Canada, we'd probably have a revolution or some serious impeachment movement. :lol2:

All I can say is OUCH! and I feel for you.






http://i5.photobucket.com/albums/y186/lizzywiz/gtp.jpg
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.

yeah i guess your right, if some stupid ricer pulled up i would take his crap thats just me, so i guess its better to be safe than sorry, im just gonna stick with the premium fuel, cuz realisticaly it is not that much more expensive and it will give me longer engine life i think. thanks for all the help

Gas here is 2.73 for 87 than 2.83 for 89 than 2.93 for 91,

Thanks for the reply guys. You guys are lucky, When your prices shoot up ten cents a gallon ours go up ten cents a Litre which works out to forty five cents a gallon ,no bullsh.. Canadians just to layed back, Whine about the prices abit then just get in your car and ride on.

Take care ,Keep up with excellent forum

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. :2cents:







http://i5.photobucket.com/albums/y186/lizzywiz/gtp.jpg
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.

Here in Ohio its 87,89,91,93,94 grades. I thought i join in over here. I got lonesom in the alero form.

Here in Ohio its 87,89,91,93,94 grades. I thought i join in over here. I got lonesom in the alero form.

No problem. You're welcome here Andrew. We get people from other forums all the time. What's the cost per gallon in your area now?







http://i5.photobucket.com/albums/y186/lizzywiz/gtp.jpg
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.

94 oct at sunoco-abour 2.79-2.99 approx. what about down there?