How does everyone test a car with an automatic tranny without it downshifting, etc? Or does that even matter.
With a manual trans car, they can throw it in 4th gear and test from 2000 on up to redline. I don't understand how this can be done on an auto car without downshifting and just running back up through the gears

I know its confusing. I want to throw my car on the dyno, and I'm curious as to how that will work out.

 

I think you just drop it in 3rd. Not 100% on that so don't hold me to it.

 

I had my car dyno'd, and they just run it up to speed gradually to get it into 3rd (put the shifter in 3rd too) and once it shifts I think they just gradually get on the gas until it gets up in the revs and completely floor it beyond ~4000 RPM or so? (after a point where it won't downshift). I can't tell you exactly to be honest, because most shops will only allow their own techs to run the cars, never the owners.

 

Chevy High Performance used a dyno to figure out how much power a car produced in every gear.

I think you put it in D and slowly get up to speed then once it is in 3rd gear you roll onto the throttle.

 

had to get one read on my car from 2nd gear, most of the time it downshifts. its hit or miss.