69 Valiant dyno numbers, and video

Good discussion - :glasses2:

FWIW I think both approaches have their merits....I like using the chassis Dyno to get the state of tune in the ballpark - check AF and experiment with timing.

We get a limited number of runs at the local track so its difficult to start from 1st base - thats where the Chassis dyno time helps.

I also agree that you learn things quickly - like the time I discovered a 1/4 turn on a Thermoquad metering tree yielded an extra 12 RWHP!! :shock:

That said - I took my "perfect tune" to the track one night - and ended up ruunning 1.5 MPH more after going one stage richer than the Dyno tune...in similar temps!

............so there's no replacement for real world.

On losses - We have a guy who's buit a few 10 second SB mopars in my city..... he swears that a 727/4000 stall/9" combo will lose appx 120 HP from the Crank,

He reckons you can "set your watch" by it.... and he's always engine dynoed his builds...so he's been able to compare.