Dyno Tuning

[Trevor]

Hi, I was wondering what gear you all use when you are tuning on the dyno? I've heard before that people use the 1:1 gear, which would be 4th on the 240. I'm just curious why the 1:1 gear is used the most? Sorry for this question. it's probably an easy answer but i'm confused. thanks

[C-Kwik]

Depends. For th most part, a taller gear tends to give a longer pull so in a sense better "resolution". For turbo cars it can make a bigger difference because of the higher load. Some turbos may not hit max boost in first gear or for as long a duration so lower gears may not give a very accurate detail of what the car can do.

5th gear pulls can be used as well, but I doubt there would be enough benefits, would be impractical, and on some cars, impossible due to speed limiters.

[Exar-Kun]

its also used for ease of calculation pruposes for the dyno, no bothering with adjusting the torque figured and such for gearing..just thought I'd add that.-chet

[C-Kwik]

It's a good point, but it's an easy calculation to convert the figure since they can tell how fast the drum is turning and how fast the engine is turning. I think the Dyno actually does the calculation for you....