Venom Lover
Enthusiast
...I put the street tires back on, replaced the scorched spark plug wire, and replaced all the spark plugs with Champion gold on Friday and went back to R&D Dyno. Did a run with stock inlet tubes on, just for comparison with the dyno run in September to make sure Wednesday's anomaly was resolved. Sure enough, the curves were within 1 hp/ft-lb of each other (Friday vs. September). Peak hp agreed to the tenth (448.7 rwhp). Kind of scary the repeatability, especially since atmospheric conditions were so different (probably 20 deg cooler on Friday and much more humid). I guess SAE corrections really work.
Anyway, whatever the problem was with the Wednesday dyno run, it was either the slicks or a spark plug or the #1 spark plug wire.
So, then I put the smooth tubes back on and re-ran. Peak power was up to 456.0 rwhp and torque was up to 490.4 ft-lbs, so the smooth tubes bought a little over 7 rwhp and 5 ft-lbs. I have to admit I had my doubts that they would make a difference, but they did.
Oh, I also used to question whether the dyno numbers were a bit higher than truth....I ran my Z06 on the same dyno with the results shown below in my signature. Since most folks are getting 340-345 rwhp and rwft-lbs in stock Z06 trim, and I dyno'd below that on the same machine on the same day, I do believe the machine doesn't have a bias on the high side. (If it did, that would mean my Z06 is more 10+ hp below average, and probably wouldn't be running in the 12's.)
Anyway, whatever the problem was with the Wednesday dyno run, it was either the slicks or a spark plug or the #1 spark plug wire.
So, then I put the smooth tubes back on and re-ran. Peak power was up to 456.0 rwhp and torque was up to 490.4 ft-lbs, so the smooth tubes bought a little over 7 rwhp and 5 ft-lbs. I have to admit I had my doubts that they would make a difference, but they did.
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Oh, I also used to question whether the dyno numbers were a bit higher than truth....I ran my Z06 on the same dyno with the results shown below in my signature. Since most folks are getting 340-345 rwhp and rwft-lbs in stock Z06 trim, and I dyno'd below that on the same machine on the same day, I do believe the machine doesn't have a bias on the high side. (If it did, that would mean my Z06 is more 10+ hp below average, and probably wouldn't be running in the 12's.)
