How does one go about dyno testing an auto?

[14.5 drift]

I understand on the manuel cars the car has to be in 4 th gear to get a proper read out, what gear would an auto meter best in, and also how would you keep the thing from down shifting gears on ya? Thanks in advance

 

[Defiant]

That's probably because in most cars 4th is a direct drive, removing one math problem from the drivetrain equation.
In an automatic, you have the torque convertor soaking up a fudged amount of power, so I suppose you'd just drive. I don't know how you deal with downshifting under load. But I'll bet the guys running the dyno do.

 

[Chuck_3]

at school we used third gear with a manual for the dyno's....and with automatic we just gave it gas and let it shift into 3rd and hold it at 3500 rpm then floor the piss outta it

 

[14.5 drift]

That's probably because in most cars 4th is a direct drive, removing one math problem from the drivetrain equation.
In an automatic, you have the torque convertor soaking up a fudged amount of power, so I suppose you'd just drive. I don't know how you deal with downshifting under load. But I'll bet the guys running the dyno do.

Dont we 2g's have electronic lockers in the TC?

 

[doug]

What I do is get the car up to a 50 MPH cruise and then floor it-- at that point it won't downshift. If there's a way to do it better, I'd love to hear about it, because I think this method may make the HP readings a little low-- I only managed 208 WHP with a Big16G last time, although it was on the stock SMIC at only 17 PSI.

 

[14.5 drift]

my car will downshift to second below 4k in third.