Dynoed my 427so Cobra today.... interesting to say the least!

[neverwouldof]

Originally Posted by DAVID GAGNARD

I do believe both engine and chasis dynos are a good thing.......there is plenty of hp/tq to be gained or lost when using a dyno for tuning vs. seat of the pants tuning or guess work........

there used to be a dyno about a mile from my house owned by a good friend, and dirt late model racer.........he ofton would call me on a saturday morning when dynoing race motors to go and watch........on one 635hp race motor I have seen a total gain of 62 hp after a dozen pulls.......this was done with timing and jetting changes and changing out the carb spacer!!!!!!!! they started the session with the timing and jetting that the engine builder suggested and worked from there..........
On my motor,a timing change of 2 degrees made a difference of 8 to 12 hp, nothing else changed, my motor likes 32 degress total and when we went to 34 it lost 12 hp, going to 36 it lost an addition 20 hp, that is something I never would have found without a dyno tune.......

Chasis dynoing can give you an idea of what if any changes you may want to make to the driveline/exhaust system, it has been shown a number of times just how much hp some exhaust systems can "eat"........
I will always dyno my race motors and if I can find a chasis dyno I can get my car onto, I'll chasis dyno it also...........

David

When you adjust timing on your engine, at what RPM are you running the motor at?

Thanks, Keith