legacy07gt Posted April 29, 2011 Share Posted April 29, 2011 I will be in the area of a gas station that either has 100 or 104 octane gas tomorrow. I was going to get some to see how it goes. A one time thing because I am sure it is a lot more expensive than 91. I just want to make sure that it wont have any bad effects on the engine. Please let me know. I would really appreciate the help. If it makes a difference I have a SPT aftermarket intake installed in the car but nothing else performance wise. 07 SWP LGT Limited - SPT CBE, Invidia UP, Invidia DP, Grimmspeed EBCS, AVO TMIC, DW65c pump, SPT Intake, ISC Coilover Link to comment Share on other sites More sharing options...
TRSCobra Posted April 29, 2011 Share Posted April 29, 2011 I doubt you'd notice any difference unless you were tuned for it, but as long as it's unleaded, you should be fine. Link to comment Share on other sites More sharing options...
legacy07gt Posted April 29, 2011 Author Share Posted April 29, 2011 Well I am probably going to try it anyways just to do it once haha. Assuming I can find the place. I was told about it today so i am going to try to find it tomorrow when im in the area. 07 SWP LGT Limited - SPT CBE, Invidia UP, Invidia DP, Grimmspeed EBCS, AVO TMIC, DW65c pump, SPT Intake, ISC Coilover Link to comment Share on other sites More sharing options...
underground000 Posted April 29, 2011 Share Posted April 29, 2011 um the car is ment to run on 91, so yea try it and see what happen, dont forget to disconnect the battery. If you want to run the car empty, when the dash gauge says 20, 10, -- (miles left) when It just hits -- you have about 1.5 gallons of gas left 5eat downshift rev match:) Powder coated wheels: completed:) Link to comment Share on other sites More sharing options...
csbrown28 Posted April 29, 2011 Share Posted April 29, 2011 I will be in the area of a gas station that either has 100 or 104 octane gas tomorrow. I was going to get some to see how it goes. A one time thing because I am sure it is a lot more expensive than 91. I just want to make sure that it wont have any bad effects on the engine. Please let me know. I would really appreciate the help. If it makes a difference I have a SPT aftermarket intake installed in the car but nothing else performance wise. You may already know this, but in case you do not, I offer the following: Since octane, simply speaking, is a measurement of how much pressure the gasoline can take before spontaneous combustion, I would say 104 octane is a total wast of time as there is no more energy in 104 octane then there is in 91 octane. Unless, as mentioned, your car is set to run at incredibly high compression and needs the higher octane to prevent pre-ignition. There is always the chance that 104 won't burn correctly and will diminish performance and mileage. As far as damage, not sure... Link to comment Share on other sites More sharing options...
bmx045 Posted April 29, 2011 Share Posted April 29, 2011 No. Your car will blows up. Link to comment Share on other sites More sharing options...
LosAngelesLGT Posted April 29, 2011 Share Posted April 29, 2011 Waste of money. If you are not pulling or tune-advancing timing or knocking why are you going to put higher octane in? Link to comment Share on other sites More sharing options...
csbrown28 Posted April 29, 2011 Share Posted April 29, 2011 Doh, browser refresh, repost... /delete Link to comment Share on other sites More sharing options...
ehsnils Posted April 29, 2011 Share Posted April 29, 2011 For all we know that gas station may be selling the gas labeled in RON instead, which makes it much less spectacular. Link to comment Share on other sites More sharing options...
BigTDogg MA Posted April 29, 2011 Share Posted April 29, 2011 For all we know that gas station may be selling the gas labeled in RON instead, which makes it much less spectacular. Not likely in the US, as I beleve the federal requirement is to post as R+M/2 Like others have said, there is no benefit. But why are you running 91 if you're in CT? Don't you guys have 93? Link to comment Share on other sites More sharing options...
DirtyDan Posted April 29, 2011 Share Posted April 29, 2011 I've seen too much octane loose power on a dyno. Had a buddy put 116 in a turbo Mustang and it wasn't making the power he expected. Data logger showed zero knock even when throttle was slammed open. Dumped in a couple of gallons of 91, the car picked up about 28 hp at the wheels. Link to comment Share on other sites More sharing options...
legacy07gt Posted April 30, 2011 Author Share Posted April 30, 2011 Not likely in the US, as I beleve the federal requirement is to post as R+M/2 Like others have said, there is no benefit. But why are you running 91 if you're in CT? Don't you guys have 93? Yea some places have 93 but there are very few around me so I usually put 91 in. When I get a chance I do put in 93. Anyways i couldnt find the place so i didnt do it. Guess I will just stick to 91 for now. 07 SWP LGT Limited - SPT CBE, Invidia UP, Invidia DP, Grimmspeed EBCS, AVO TMIC, DW65c pump, SPT Intake, ISC Coilover Link to comment Share on other sites More sharing options...
mwiener2 Posted April 30, 2011 Share Posted April 30, 2011 $10/gal hp losing fuel... unless you're tuned. The it's called race gas. My Mods List (Updated 8/22/17) 2005 Outback FMT Running on Electrons Link to comment Share on other sites More sharing options...
underground000 Posted April 30, 2011 Share Posted April 30, 2011 guys you dont know how good race gas smells its totally worth the monies 5eat downshift rev match:) Powder coated wheels: completed:) Link to comment Share on other sites More sharing options...
dr_sharp Posted April 30, 2011 Share Posted April 30, 2011 $10/gal hp losing fuel... unless you're tuned. The it's called race gas. That's about the same price as 93 now, right? lol Link to comment Share on other sites More sharing options...
RuskiTrombone Posted April 30, 2011 Share Posted April 30, 2011 guys you dont know how good race gas smells its totally worth the monies Smells great when the car is on fire. Link to comment Share on other sites More sharing options...
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