weight on dyno?

[bl1tzk1213g]

I've never dyno my car before but does weight matter? My neighbor and I had a little pep talk about dyno and I thought weight matters. Like for example a k20a2 on a integra vs. k20a2 with same setup on a civic hatch or crx. Would they put down same number to the wheels or not? I'm sorry if this sounded stupid :}.

[defiancy]

Originally Posted by bl1tzk1213g

I've never dyno my car before but does weight matter? My neighbor and I had a little pep talk about dyno and I thought weight matters. Like for example a k20a2 on a integra vs. k20a2 with same setup on a civic hatch or crx. Would they put down same number to the wheels or not? I'm sorry if this sounded stupid :}.

Nope has nothing to do with weight.

If they were the same motors given a few horsepower yes they would put down the same numbers. But with that being said that crx probably ways alot less than that integra so it will be the faster car. Weight only has to do with when you are actually racing not on the dyno. On the dyno the car sits on rollers that measure TQ and through a nice formula they come up with your TQ/HP numbers in a neat graph with a bunch of other stuff.

[kjewer1]

Defiancy is correct, but because I'm anal, I have to add that weight will play a SMALL role, since some power is still lost to the tire-roller interface. For repeatablity most dyno shops (should) ask you to set tire pressure to a specific value, usually 40 psi. A dynapack type dyno eliminates this variable, since it bolts to the hubs. Most poeple ignore the power lost at the tire, since you'll also lose it in the same way on the street, so it's still a "real" number. Just had to toss that in, becuase I'm anal like that.