[AL427SBF]

Originally Posted by blykins

It's a reasonable set of numbers. Some dynos operate differently than others and a peak torque curve there is reasonable and realistic.

Keep in mind that you can't always pull an engine down that low, and most of the time it's not warranted, nor is it safe to do so. A wide open throttle pull at 2000-2500 can induce detonation and modern performance engines with larger heads and cams are not meant to have their guts pulled out at such a low rpm. You would see that kind of operation in a dump truck engine, which is meant to be fully loaded not too far off of idle....with compression ratios, dynamic compression ratios, piston design, ring gap, etc., to handle that kind of load and heat.

To make a long story short, I wouldn't advise asking a dyno operator to pull one down that far....

A reasonable starting point is 3500-4000. A dyno is more for determining issues with the engine, general A/F curves, and peak horsepower/torque numbers. You can't drive a dyno, and the poster that made the comment that everything changes once the engine is in the car, is correct. Different air cleaners, different headers, etc. make differences. While I'm ranting, I'll also point out that different ignition boxes (even of the same brand) will give different timing settings, so be sure and double check the timing once it's in the car and running.

I may move up to 3K then, still want to know what the power is where it will be driven - also talking chassis dyno.