Auto Tranny Gear Ratios? - Dyno Tips?
 

I'm going to see my friend that owns a Dyno shop. Figure I might as well see what the Rex is putting down.
Since its an Auto, I need to know which gear is closest to 1:1 to get the most accurate #'s out of it.

Also, any tips for dynoing with an auto? I know all about doing it in my GTP properly, just not real sure on this one. Can I hold it in a gear? Any way to manually prevent the kick-down to a lower gear?

Thanks.

Murdock

You can stay in any gear, just shift it to 1, 2, D (3), and OD (4).

Gear Ratio's, anyone?

I belive your 3rd gear is a 1.0 ratio.

Thanks, thats what I figured, 4th/OD is like .7/1 isn't it?

Murdock

I think O/D is .8 something.

Man, I know I've seen this info out there, I just can't find it now :(

I figure I'll dyno in 3rd.
Just hopin it'll break 100HP at the wheels! I'll find out saturday.

Murdock

3rd is a 1:1. Just keep your hold button on and it should prevent it from going into overdrive or kicking down.

OD is .720:1.

Forgive me, but hold button?

Murdock

Yeah, the hold button. The button on your shifter that engages the "hold" light on your dash? You do have one right?

Re: Auto Tranny Gear Ratios? - Dyno Tips?
 

Key word in that sentence: MANUAL-ly

Now, I may be totally missing it, but, no. Its an S4, I have an overdrive switch, and thats it.
I'll just kick of the O/D and determine the kick-down RPM on the road. Then I'll just have him dyno it from that RPM up so it doesn't kick-down.

Murdock

Oh right, the S4s do have a different setup. :p