Went to the dyno in May (A mustang dyno) and made 202whp and 130ft-lbs

Went to the same dyno yesterday and made 193whp and 127ft-lbs???

In May, 94 octane - 25ignition at WOT - 4th gear pull with 1.108:1 and 4.928:1 FD

Yesterday, 100 octane - 28ignition at WOT - 4th gear pull with 1.034:1 and 4.928:1 FD

When I overlayed the 2 graphs, I was 5-7whp less across the board from 3000-9000rpm?

Is it the longer gear that I used yesterday that did this....motor 250-255 comp across the board which was the same as in May?

 

temps correction maybe?

 

dose the car feel slower ??? if not dont worry about it numbers are just numbers

 

I would go back and dyno run with 94 and 25 ign to see if it really is the gearing!

 

I believed it's the temp correction because I dyno an all motor integra two months ago and it make 197 whp / 135 ft/lbs of torque then we redyno it yesterday again without changing anything and it make 191 whp / 128 ft/lbs of torque. When we overlay the maps, there was about a 6-7 whp difference throughout the band. It was 20 degree cooler when we dyno the first time.

Steve