Book calls for 91 oct
05-06-2010, 01:23 PM
#24
Straight from the manual:
If you have the 3800 Supercharged engine (VIN Code
l), use premium unleaded gasoline rated at 91 octane or
higher.
05-06-2010, 03:04 PM
#25
Maybe they revised the spec in 2004, but my '97 GTP required 91 octane minimum. It was labeled in the gas filler door as well as in the owners manual:
Straight from the manual:
If you have the 3800 Supercharged engine (VIN Code
l), use premium unleaded gasoline rated at 91 octane or
higher.
Straight from the manual:
If you have the 3800 Supercharged engine (VIN Code
l), use premium unleaded gasoline rated at 91 octane or
higher.
05-06-2010, 03:08 PM
#26
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i run 93 in everything i own... pump 93 octane... in most cases... is not even 93.. more like 90-91 so i want as high octane as i can get.. plus... ever look at 87 vs 93 in a clear container? 87 is yellow... and dirty looking, 93 has a blue tint to it. to me 87 is $hit fuel.. i'll run it in my mower but that's about it. at only .20 more a gallon.. i'll take the higher octane especially in the summer months.
05-06-2010, 05:47 PM
#28
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Incorrect, it calls for 91+ for maximum performance, but can run on 87. I actually ran my best 1/4 mile on 89 when I had my 04 GTP.
Back to what RPM WS6 said, yes! You ever get the feeling that people have no sense of direction and follow whatever they hear? Putting 91+ in the 3.8 (n/a) is just about as pointless as the people running sythetic oil and changing it at 3k.
Back to what RPM WS6 said, yes! You ever get the feeling that people have no sense of direction and follow whatever they hear? Putting 91+ in the 3.8 (n/a) is just about as pointless as the people running sythetic oil and changing it at 3k.
05-06-2010, 06:01 PM
#29
Couldn't agree with you more. I've put 60k miles on this car now and for the first 1 or 2 thousand miles I ran 87. For some reason it ran like **** leaving me to believe it was dynotuned by the previous owner. Could never confirm it though. Switched up to 91 and the car ran smoother, ticked less and started getting better mpgs. Just my experience with this car. Dynod the car a few years ago and put the numbers down I'm showing in my sig which was more than I was expecting for a bolt-on 3.8.
Getting the best performance is about running the correct fuel, timing and spark plugs (heat range). All three need to be considered before you start really changing things around.
05-06-2010, 09:26 PM
#31
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i run 93 in everything i own... pump 93 octane... in most cases... is not even 93.. more like 90-91 so i want as high octane as i can get.. plus... ever look at 87 vs 93 in a clear container? 87 is yellow... and dirty looking, 93 has a blue tint to it. to me 87 is $hit fuel.. i'll run it in my mower but that's about it. at only .20 more a gallon.. i'll take the higher octane especially in the summer months.
....and I would really like to know where all these people are getting the idea that premium fuel will give them better power/MPG/engine life in an application that calls for regular?
Octane (by itself) does NOT = more power, it just = more resistance to detonation (as has been posted previously). But if you have an engine/tune that doesn't *need* that extra resistance, then all you are doing is hurting power and MPG by slowing the combustion process.
Last edited by RPM WS6; 05-06-2010 at 09:46 PM.
05-07-2010, 03:49 PM
#33
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Obviously, you are welcome to your opinion, but understand that it's just that.... your opinion, not fact. 87 isn't "**** fuel", nor is 93 going to do anything to help MPG, performance, or engine longevity in an application where 87 is the optimal fuel.
....and I would really like to know where all these people are getting the idea that premium fuel will give them better power/MPG/engine life in an application that calls for regular?
Octane (by itself) does NOT = more power, it just = more resistance to detonation (as has been posted previously). But if you have an engine/tune that doesn't *need* that extra resistance, then all you are doing is hurting power and MPG by slowing the combustion process.
....and I would really like to know where all these people are getting the idea that premium fuel will give them better power/MPG/engine life in an application that calls for regular?
Octane (by itself) does NOT = more power, it just = more resistance to detonation (as has been posted previously). But if you have an engine/tune that doesn't *need* that extra resistance, then all you are doing is hurting power and MPG by slowing the combustion process.
05-08-2010, 01:09 AM
#35
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I'll buy the cheapest gas I can, but not on the white Z, it's tuned for 93, and around here they're putting up to 10% ethanol in the cheap grade fuel. I wouldn't take my chances with that stuff even if I could run it.
05-08-2010, 10:36 AM
#36
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We've had 10% ethanol in all grades/brands of fuel in my area for probably 20 years at least. Doesn't seem to cause any issues at all.
05-08-2010, 12:32 PM
#38
The small town i live in had 3 gas stations still selling gas with NO ethanol till last week, so now i gotta use the ethanol gas like everyone else. But i always put 93 in the trans am. In my 01 silverado with a 6.0 it pings on 87 octane unless it was gas without ethanol so now i may just have to hear the pinging cause it is expensive putting 93 in a truck getting 11 mpg's.
05-08-2010, 04:00 PM
#39
I'll buy the cheapest gas I can, but not on the white Z, it's tuned for 93, and around here they're putting up to 10% ethanol in the cheap grade fuel. I wouldn't take my chances with that stuff even if I could run it.
The small town i live in had 3 gas stations still selling gas with NO ethanol till last week, so now i gotta use the ethanol gas like everyone else. But i always put 93 in the trans am. In my 01 silverado with a 6.0 it pings on 87 octane unless it was gas without ethanol so now i may just have to hear the pinging cause it is expensive putting 93 in a truck getting 11 mpg's.
