Hi, what do you mean by higher octane? 87-93 octane or do you mean a cam 2/racing gas with ratings of 97-108 octane?? Back in 1986/87 when these cars were new we would fill up our gas tanks with super unleaded and add a can of STP 100 octane booster and the car would run great but, I haven't done that since back then. We used to drive around with a case of STP octane booster in the trunk. Nowdays, I always run Sunoco 93 octane gas and it runs great. Now that you reminded me of the higher octane i may start throwing in a can of STP booster in it again....that's if they still sell it. As far as the cam 2 high octane gas, I think it would be a waste of money on a stock car with little benefit but, I wouldn't have a problem with running a higher octane between a 97 and 100 but, I wouldn't go any higher. Back in the 90's I had a 99 SS camaro and I put some 105 octane and blew out my O2 sensors....I was young and dumb so I didn't know better. The higher octane gas is meant for built motors running higher compression and/or high boost, so I doubt there is much benefit on a stock like motor....IMHO.
95 or 97 octane....in my opinion will be ok and probably make the car run crisper, i wouldn't go over a 100 octane IMO. It might be cheaper to get a can of octane booster to add to a full tank, like I said in my previous post I did this weekly for a couple years and the car ran great/strong. I'm gonna shop around for the STP brand 100 octane gas booster, I'll buy a case and keep it in my trunk like I use to do in the old days. Thanks for the reminder!!
How do you know you don't have knock? Are you using a scanner? I'm not a fan of octane boost, it coats the plugs and raises the octane very little. Your better off adding some race fuel and actually watching your fuel gauge go up.
Higher octane unleaded gas allows you to make higher boost levels without engine knock. If your current set up does not include an aftermarket boost gauge, an adjustable wastegate on the turbo, and an aftermarket knock gauge or ScanMaster, then the answer is the higher octane will have no benefit.
Let me clarify ... if your car runs great now and you do nothing but add higher octane gas, then it will do nothing. Just a waste of money.
You didn't say what octane you're using now but don't go below 93.