Quote:
Originally posted by boxermania
I see that the topic has become interesting.....horsepower here and horsepower there.
What is a few horses amongst friends, of course you will see dyno differences, temperature corrections and certainly it is assumed that the engine is in a perfect state of tune.
For instance, the chart above with the AFR in the 12's from 5K on is losing output. It has been proven time and time again that depending on the engine configuration the best power is attained between 12.8 and 13.2. So based on my experience one could see some additional HP if the mixture is leaned out some.
Likewise the spark lead will always affect the HP, I remember early on when we use to "power tune" the cars, since it will position the fire in the cylinder when the most effort can be obtained from the downward stroke of the piston.
On the other hand, turbo cars typically run on the rich end to insure temperature control since these can get away fairly fast and then, Ouch!!!!!
I think that a couple of acceleration runs on third gear with a G-meter should give us a pretty good idea of where the subject car dials in......has anyone here done the G-meter?
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Good points on the AFR.
A long time ago, I used the G-Tech, but only for timed runs to 60. The results were all over the place. My car clocked 0-60 in 6 seconds, then 8, then 7.5. Finally I gave up as I believed I was hurting my drivetrain and/or engine.
I ended up relying on a stopwatch.