93 Octane???
Both of my LT1s have HATED 87 octane. Tried it once on both of them. I only run 91 (best I can get around here).
It even says "Use premium fuel" on the gas door and in the owners manual.
It even says "Use premium fuel" on the gas door and in the owners manual.
yess! 
Seems there is the usual amount of missunderstanding about octane here, as I said it is JUST to prevent detonation. I asked pcmforless for an 87 octane tune one winter and didn't notice a performance drop so I stuck with it, the 13.2 runs were on 87 octane. Think many of you would be suprized if you dyno tuned 87 then 93 on a stockish motor. I am very sure at least a part of the reason GM speced 91 and tuned for it was because they know the masses missunderstand octane and would likely use super anyway, that and it is a good marketting ploy to say it needs 91 minimum afterall isn't that the hallmark of a "performance" engine.
I am not saying everyone should switch to 87 octane programming just that it WILL work much better than all of you think. With an upcoming heads/cam swap I plan to be over 11:1 static with aluminum heads so I will be switching to higher octane, but if the iron head motor is fine at 10:1 the aluminum heads can run perfectly at their stock 10.4:1 if tuned for it. I am also not claiming the b-body was speced 87 for performance reasons just that performance did not suffer because of it.
Look here at the cam specs for each http://www.automotiverebuilder.com/ar/ar99928.htm much smaller cam, lower compression, lower octane tuning yet still made 260/330 to the f-body 275/325. The b-body has a 3" MAF and while yes it has duals they are very restrictive so it was grandma quiet as was our intake tract so I am sure both are at least as restrictive as the f-body pieces. Boy that 87 octane must really hurt power
. Facts mean little to many of you though 
.
I am not saying everyone should switch to 87 octane programming just that it WILL work much better than all of you think. With an upcoming heads/cam swap I plan to be over 11:1 static with aluminum heads so I will be switching to higher octane, but if the iron head motor is fine at 10:1 the aluminum heads can run perfectly at their stock 10.4:1 if tuned for it. I am also not claiming the b-body was speced 87 for performance reasons just that performance did not suffer because of it.
Look here at the cam specs for each http://www.automotiverebuilder.com/ar/ar99928.htm much smaller cam, lower compression, lower octane tuning yet still made 260/330 to the f-body 275/325. The b-body has a 3" MAF and while yes it has duals they are very restrictive so it was grandma quiet as was our intake tract so I am sure both are at least as restrictive as the f-body pieces. Boy that 87 octane must really hurt power
. Facts mean little to many of you though . 
