18 replies to this topic

[laird]

I am going down to Cobb Tuning tomorrow for a dyno session on their Mustang Dyno. I know I have read some "how to's" with the auto tranny but welcome advice.
Thanks,
Laird

[nolanator]

I am going down to Cobb Tuning tomorrow for a dyno session on their Mustang Dyno. I know I have read some "how to's" with the auto tranny but welcome advice.
Thanks,
Laird

i recently just became curious about this too, so i'm kinda interested in what people say.

[Gregg]

nothing really special...tell them not to start logging until you reach 80mph (I forget exactly what speed you need to be at so that the transmission does not kick down from 3rd to 2nd if you punch it, but I think it's 75-80 - can anyone confirm?).

Put it in 3rd gear, Sport Mode, bring your speed up to 80 (or whatever speed you need for it not to kick down to 2nd), when they so "go" you can punch it, ease into it, whatever you want, and just take it to the rev limiter.

[HtownTurboBrick]

fill your tires to 45-50 psi, gives a smoother reading. some say u see more HP too, but i think thats bogus.

[Oreo931]

nothing really special...tell them not to start logging until you reach 80mph (I forget exactly what speed you need to be at so that the transmission does not kick down from 3rd to 2nd if you punch it, but I think it's 75-80 - can anyone confirm?).

Put it in 3rd gear, Sport Mode, bring your speed up to 80 (or whatever speed you need for it not to kick down to 2nd), when they so "go" you can punch it, ease into it, whatever you want, and just take it to the rev limiter.

When I dyno'd I did it similar to this.
You want to dyno in 3rd gear.

I actually had my car in drive (D), and I believe the car was in sports mode.
I SLOWLY brought the car up to ~70-80mph, and made sure it stayed in 3rd. Once I reached that speed I floored it. If the trans doesnt kick down then you are good-run it until redline/rev limiter, if it does kick down, you wont get a good reading.

Here are 2 videos, one shows a good run, one shows a run where the kick down engaged:

Good dyno run:


Bad dyno run, kick down engaged and then you can hear the car shift:

[teamxtremekid87]

I was on a dyno a few weeks ago. I put the shifter in third rolled up to about 45 mph and if you roll slowly into the gas and dont hit the kickdown you can do a run in third from 45 or 50 to around 110 or so in third gear. Its something I practiced on onramps to highways for a little bit before I went to the dyno. That was done in economy mode.

[turbor850]

I was on a dyno a few weeks ago. I put the shifter in third rolled up to about 45 mph and if you roll slowly into the gas and dont hit the kickdown you can do a run in third from 45 or 50 to around 110 or so in third gear. Its something I practiced on onramps to highways for a little bit before I went to the dyno. That was done in economy mode.

Finally someone said it, I was getting worried

you can start in drive or 3rd gear, leave it in ECONOMY mode and dont go all the way down (kick down) once you reach around 70 you can put the pedal all the way to the floor and rev it out . . .

[lookforjoe]

I'm surprised they let you "drive". Around here, they would NEVER let you run the car yourself - the shops you guys don't have liability issues with that?


Good luck with it!

[nolanator]

okay so which one is it...sport mode or economy mode. i hear a little bit of both going on.

[turbor850]

okay so which one is it...sport mode or economy mode. i hear a little bit of both going on.

read post # 7

[nolanator]

read post # 7

why didnt you just say economy??

[Fudge_Brownie]

why didnt you just say economy??

Why didn't you just read the thread...?

And why not put it in Winter mode if you have it? Should lock the car in 3rd gear.

[samadkins29]

Dumb question, but what is actually happening at the end of the dyno run? Is 3rd gear being maxed to the rev limiter? And why 3rd gear, just the best gear to be in?

[Fudge_Brownie]

Dumb question, but what is actually happening at the end of the dyno run? Is 3rd gear being maxed to the rev limiter? And why 3rd gear, just the best gear to be in?

On our automatic cars, third is the closest to 1:1 ratio. When you dyno, you want to be in the gear that is closest to 1:1 as possible.
The end of the dyno run is when you hit the max rpm, or the dyno operator tells you to shut it down cause you'll blow your shit up

[nolanator]

Why didn't you just read the thread...?

And why not put it in Winter mode if you have it? Should lock the car in 3rd gear.

i did read the thread...if you would have read the thread too you would have seen people mention both options. i was kinda hoping someone could clear it. not be a prick

[laird]

Bring cab fare.

Nice!

[JHEIII874T5M]

Good luck!

Yeah, keep it in Economy, put the shifter in 3rd... roll into the throttle (Don't engage the kickdown) and then at 70-80 MPH floor the hell out of it.