chrisd0729

I filled up with 91 octane last week not knowing I was going to the drag strip tonight. It's an 06 LS2 completely stock... Is it safe to race and run flat out on 91?

haljensen

Yes it's safe. The car is designed to run on 91 Oct.

Gearhead Jim

The ECM might end up pulling a bit of timing on 91 in some situations, but should be safe.

chrisd0729

Thanks for the help guys. I made 5 passes and best time was 12.985. I was satisfied but, think I can do better next time. I read a few posts where people said the LS2 has 2 timing tables- one for 91 and a better one for 93 octane. Some folks suggested 93 for any type of racing or else you risk damage from pinging.

I added 1.5 gallons of 110 octane at the strip and also added a bottle of octane boost. Didn't hear a single ping the whole night.

HOXXOH

You possibly over-octaned (if that's a word) it.
Higher octane burns slower, so you may have lost some power. We only have the E-10 91 octane in AZ. If we get a little KR, it's not worth adding anything. But with a lot of KR, trying to push the mix to 93-94 is enough to resolve the temporary problem.

haljensen

The car doesn't wait for "ping" to pull timing. Timing is pulled automatically when coolant temps reach xx° and/or intake air temps reach xx°. Doesn't make any difference what Octane gas you put in it, it pulls timing by GM designed tables. The tables are set for 91 Octane at a specific air temperature range and specific air pressure (density) range.

If the car does sense ping from the initial setting it will lower the ignition timing advance to a different table.

REDC4CORVETTE

That's all I have over here 91 and I run 12.40 to 12.53's all night long and I have the ls3.