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Originally Posted by sperry
Wow, I'm surprised the hp loss was only about 10 hp. Any chance you've got the data still from both runs? I'd like to see how/if the power curve shape shifts due to altitude.
Also, what were the temperature/humidity differences betweent he Davis and Reno pulls, if either of you can remember? Was it hot in Davis and cool in Reno? That might explain the two numbers being so close.
All I know is that I can noticably feel the difference in power/torque when I'm driving in Reno at altitude, vs. at sea level... and I don't think my butt-dyno is sensitive enough to pick up +/-10 hp.
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Sperry,
I do believe that the Davis number was in significantly hotter weather than the Reno number, so that certainly accounts for some of it.
On the original tune, Cody's car deffinately lost more than 10whp going to elevation, but after some remote tuning I was able to close the gap a bit. Of course it still looses some power at elevation, but its not more optimized for the each condition bringing the power variance down significantly.
The other thing to remember is that a 10whp difference on a low reading dyno is equivalent to a significantly larger variance on a higher reading dyno. So in fact, you could most likely feel a 10whp difference on a ~200whp car.
Thanks
-- Ed