dyno #s

[scotto]

Just had a ? about dyno #s. Would dynoing in December and then in May make a 30-40 hp difference? Temps are about 40 degrees higher and teh humidity is way up it was 89% when on the dyno. Anyway everything else was good the tune was dead on with A/F in the mid to high 11s all the way across teh board. Just wondering if this would be a normal thing?


Thanks for any help in advance

 

[CobraBob]

Heat and humidity do make a difference. I would say if that December dyno was ideal and the one in May was way up there in humidity (and temps in the 90s) there could be a 15-25 hp difference for cars in the 430-475rwhp range. I'm not so certain about 30-40. Maybe in cars pushing over 500 to the rear wheels. FWIT, I dynoed once in July (humid and temps in the high 80s) and again in November (dry and about 48-50 degrees) back in 2003 and saw a 12rwhp difference (445rwhp and 457rwhp). No changes had been made to the tune or mods.

 

[scotto]

CobraBob thanks for the response. My car is in the 600 hp range. And the temps and humidity are way up from the first time I dynoed. Considering all this do you think this would be possible to lose that kind of horsepower from the change in conditions


thanks