Jim and I both dyno'd our cars (on different days) at Dynospot Racing. However, Jim's figures were somewhat disappointing. We expected that Jim's engine, by virtue of its larger valve sizes and more aggressive porting, might come out below my engine in the lower part of the rev range, but that it would surpass my engine in the upper range. However, the dyno curves showed Jim's engine to be substantially below my engine over the majority of the rev range, just barely equaling my engine at the peak horsepower rpm.
( Click here for a look at these early results). Whisky, Tango, Fox-trot? - Jim and I were quite perplexed.

In retrospect only two explanations have been found for Jim's disappointing first dyno run. First, Jim found out that his in-tank fuel pump had not been operational. However, it is unclear whether a bad in-tank pump can cause a reduction in power on a dyno. Some experienced folks feel probably not. But second, Jim was in the car during the initial dyno runs. At that time he was somewhat new to the area of performance driving, and he had never been on a dyno. By his own admission it is possible that he did not fully depress the accelerator pedal during the runs. This would easily explain the low curves he obtained.