91 Octane at high altitude

Whiterock1 · Post by **Whiterock1** » Fri Apr 27, 2007 4:36 pm

I just bought a U7194 for my '06 Corvette with Bullets and a K&N Aircharger. I also have opened up the fan shroud to get only outside air to the Aircharger. We are at 6700' and 91 octane is used here (85 instead of 87 for regular) due to the altitude. I assume I can use the 93 Octane tune--highest settings for spark advance, because of the altitude. Both the Vette and my previous Ram Air LS1 Trans Am ran/run fine on the 91. I bought it to get the best performance, so definitely want to go with the most aggressive set up.

thanx!

Mike

johan · Post by **johan** » Fri Apr 27, 2007 5:33 pm

The tune is setup for 93/91 octane so you should be fine, you might run a little richer at altitude as fueling is the main thing that gets affected by elevation.

Whiterock1 · Post by **Whiterock1** » Fri Apr 27, 2007 5:35 pm

Thanx for the quick reply!

yuimyt · Post by **yuimyt** » Sun Apr 29, 2007 8:48 pm

OK,

So maybe I should try 93 oct tune here in Reno, NV at 5000' elevation?? Our highest available is also 91 at the gas station...

johan · Post by **johan** » Sun Apr 29, 2007 10:10 pm

I would not use the 93 octane tune with 91 octane, it WILL rattle and cause a decrease in performance.

Whiterock1 · Post by **Whiterock1** » Mon Apr 30, 2007 9:51 am

Are you saying that the 93 octane tune with 91 octane gas is ok in the Vette, but not in the GP?

johan · Post by **johan** » Mon Apr 30, 2007 10:59 am

Yes, because in the GXP we increase timing in the 93 octane tune over stock. The 06-07 corvettes we do not increase timing in the tunes.

91 Octane at high altitude

91 Octane at high altitude

RE: 91 Octane at high altitude

RE: 91 Octane at high altitude