Increase on dyno

[akrapovic]

Just had my car dyno'd for the second time. The first time was on a mustang dyno, my results were 312hp, 325tq. The second was on a dynojet. the results were 367hp, 400tq.



I changed my intake (victor jr to airgap) and replaced broken roller rockers prior to my second dyno. Would you attribute the gains to the work performed/dyno tune or the discrepancy (sic) between the power rating between the two dyno's. I have been told that the mustang's usually read lower.

Thanks in advance

[Lowend]

A non-functioning cylinder (due to broken rocker) could easily take 60HP out of an engine all by itself. At best you are losing 1/8 of you engine output.

That said.
All roller-dyno's are extremely inaccurate. I'm not surprised by fluctuations. Anytime you are dealing with a drive-on dyno you are dealing with a series of equations used to round off numbers to approximate HP.

Straight-to-hub dynos (like the Dynapack ) are the only way to get consistent, repeatable results.