What happened?
Thread Starter
Drifting
Joined: Apr 2001
Posts: 1,779
Likes: 6
From: LOS ANGELES CA.
What happened?
v I have a 2009 Vette with the Z51 package and stick trannie. My car has never really been fast ,but suddenly my car fells like it gained 50 more horses.The acceleration has increased.I haven't done a thing to the car.It is stock with no mods.I can't figure it out Any suggestions?
:fla g:
:fla g:
Last edited by ROD BROWN; Feb 20, 2017 at 05:55 PM.
Team Owner
Joined: Jun 2005
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From: Northern, VA
St. Jude Donor '15
"In honor of jpee"
What have you done different from before, or even recently? Think of gas brand, miles on car, anything at all replaced just as the car picked up the "approx. 50 hp"?
Thread Starter
Drifting
Joined: Apr 2001
Posts: 1,779
Likes: 6
From: LOS ANGELES CA.
Changed gas
Yes,I changed the brand of gas I was using. Iwent from Mobil to Standard,But I wouldn't think that would make that kind of difference. Thanks to all the guys that responded to my question.Rod
Last edited by ROD BROWN; Feb 22, 2017 at 12:31 PM.
Racer
Joined: Sep 2013
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From: HOMESTEAD FLORIDA
Drifting
Joined: Mar 2011
Posts: 1,448
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From: Bath NC
That is so funny. I had a similar situation with my car and I've been thinking that it was psychological! Mine is a 2008 convertible, six speed, Z51. Just turned 29000 miles and for the last 2000 miles the car has been driving like never before. It does feels like it gain a bunch of hp, all of a sudden. I did order some LT headers and X pipes but I haven't receive them yet! LOL The only thing I've done different is start using 93 octane exclusively. Before I used different octanes, I didn't think and still not sure that the gas can make such a dramatic difference. I can't wait to get the headers installed.
You should never run anything but 91 or higher octane preferably nothing less than 93.
Average cars have lower compression ratios so they can run the cheap gas. There's not enough compression in those engines to cause pre-detonation, or at least not enough to hurt anything
Pre-detonation will bust a piston or worse if its bad enough
Racer
Joined: Sep 2013
Posts: 317
Likes: 42
From: HOMESTEAD FLORIDA
Octane makes a big difference in these cars. Octane controls the burn or ignition. It keeps the gas from igniting under pressure or due to hot spots. The engine is designed to retard the timing at the first sign of spark knock (pre-detonation due to compression or hot spots).When you run low octane under spirited driving, the timing stays retarded due to the knock causing loss of power. Now with the good gas, the car isn't knocking so the timing isn't being retarded therefore more power.
You should never run anything but 91 or higher octane preferably nothing less than 93.
Average cars have lower compression ratios so they can run the cheap gas. There's not enough compression in those engines to cause pre-detonation, or at least not enough to hurt anything
Pre-detonation will bust a piston or worse if its bad enough
You should never run anything but 91 or higher octane preferably nothing less than 93.
Average cars have lower compression ratios so they can run the cheap gas. There's not enough compression in those engines to cause pre-detonation, or at least not enough to hurt anything
Pre-detonation will bust a piston or worse if its bad enough
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Thread Starter
Drifting
Joined: Apr 2001
Posts: 1,779
Likes: 6
From: LOS ANGELES CA.
91 octane
Here in L.A. most gas stations sell 91 octane gas. I think that octane no. is correct.I haven't seen any stations selling a higher octane of gas. I am going to look around and see if I can locate a station selling a higher octane fuel. i was beginning to think i was going crazier then I am .Rod
Last edited by ROD BROWN; Feb 22, 2017 at 12:29 PM.
Acct suspended by request 30 April 2019
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You can also mix in a couple of gallons of racing fuel to boost the octane. Below is a link stations selling race fuel at the pump.
http://www.davebarton.com/Unleaded_Racing_Fuel_in_SoCal
http://www.davebarton.com/Unleaded_Racing_Fuel_in_SoCal
Burning Brakes
Joined: Mar 2012
Posts: 836
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From: Killeen Texas
If you felt the difference using 93 fuel from the pump...You can try using 93 NON ETHANOL fuel. I've been doing that in my 2013 Grand Sport. There's a machine shop near to me started selling 93 Sunoco non ethanol race fuel. It makes a big difference.
Racer
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From: HOMESTEAD FLORIDA
Racer
Joined: Jan 2014
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From: Lone Star State
Yes you can run more aggressive timing and make more power if you tune for the available octane in race fuel.
If you run race fuel without a tune it won't make any more power unless the fuel you normally run is really poor / low octane.
If you run race fuel without a tune it won't make any more power unless the fuel you normally run is really poor / low octane.
Last edited by Suds; Mar 1, 2017 at 11:02 PM.
Burning Brakes
Joined: Mar 2012
Posts: 836
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From: Killeen Texas
> http://www.sunocoracefuels.com/The one that I get from the Machine Shop is a 93 octane version of the Optima Sunoco fuel (0 ethanol
) My car was tuned on a fresh tank of 93 Shell pump gas. If I can keep my foot off the pedal so much, I get better gas mileage using the non-ethanol. (More energy contained in the fuel I'm guessing? BTU or whatever it's called)
Last edited by dmoneychris; Mar 3, 2017 at 09:58 PM.