[Bill Verburg]

Originally Posted by Steve W

The numbers will depend on which brand of dyno you use. After dyno tuning hundreds of 911s on machines such as Mustangs, Dyna-packs, Dyno Dynamics, Superflow, Land&Sea, Dynojets, the most consistent numbers come from Dynojets, close enough that the same car dyno'd on one in Los Angeles will be within 3-4 hp SAE corrected of one in South Carolina. There's no operator alterable factors that can fudge, either accidentally or intentionally the HP and torque numbers, why many racing organizations use Dynojet numbers to classify cars. Given the same state of tune and chip program, I typically get hp and torque curves within 1-2 hp of each other between runs, even on different days. A 40 hp spread from a dyno is horrible resolution!!

The 210 rwhp numbers you quote sounds like a Dynojet number for a 3.2 and if so, is not bad for headers and an open exhaust on pump gas - 217-221 would be better. Well tuned 3.6s with headers and a racing exhaust typically come in between 250-263 rwhp SAE on a Dynojet. Divide the above rwhp numbers by 0.89 or 0.88 to get the approximate engine HP as Porsche would rate it.

Steve does the Dynojet not require the operator to input gear ratios and tire sizes? It's been my experience that is one place that greatly affects the results, intentionally or not.