Originally posted by Big Jim:
Just a quick comment on dyno's. You don't race on a dyno, you race on a track. The dyno can be a fabulous tool in helping find what works, but in the final analysis, racing is more art than science and it is the art of tuning to the application that makes the difference.
This is great stuff on the secondary openings. I suspect that it would be hard to improve on the factory settings unless large modifications were made. I suspect that the openings would be sensitive to things that alter breathing significantly. A hotter cam may benefit from raising the openings, more displacement may need more air at lower speeds, large increases in port size or shape may also make a difference. I also suspect that port length is critical to this design.
there is alot more error (human) to be had at the track then on the dyno... i trust dyno finds over track results any day... if you know how to use a dyno plot (and other features of the dynojet software) you can find the information they provide invaluable... while a simple timeslip can be very misleading and uninformative... no calibration, and plenty of room for human error. i am sorry, i don't agree with you on that at all... not to say that you can't learn something from the track, it is just not nearly as accurate as a dyno can be (for the average to better then average driver).
