Quote:
Originally Posted by Vettezuki
I have a tune. It took a full day from a reputable tuner. He said I might have higher compression than advertised. With 91 octane, 18 degrees total timing is all he could do before it got ugly. I run Torco (about 1 quart to 15 galoons for a net of about 93 octane, I can explain if you want). With that it's safe, but there's probably A LOT on the table with tuning and higher octane. The Vette my motor was originally in gat 432 to the wheels with mid length headers and the ls1 intake. I have an ls6 intake, a different TB, stock manifolds and of course the C3 IRS, and the best I've gotten is 391. My Dyno chart was reviewed by a serious F-Body guy who said there was a little on the table in the way of low end torque with the same octane, but it was otherwise already idealized.
HOWEVER
I'm running a stock temp thermostat. I don't recall what that is, but it's not 160. And I'm running Iridium plugs
MY GUESS
Since I'm running a fairly high compression motor with retarded timing, there's a bit on the table. The main problem is heat causing pre-detonation thus requiring retarded timing. If I can lower some of the temps and up the timing, I can get some "free" power.
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18 total timing or 18 degrees at idle???
I run 34 total degrees at 2,500 rpm with 11 to 1 compression.
I have 15 degrees timing at idle.