05Stang_WI

Check out my dyno chart, any ideas on what would cause this? I ran several runs and it was on all of them - same spot. You could even hear the engine or trans 'getting lost' for a second. Remember it's an AUTOMATIC.

We were running in 4th with overdrive locked out - torque convert should have been locked in. We were data logging in pass-through mode on my SCT xcal2.



Jim

PS: This run is after the addtion of the Steeda CAI(stock MAF), otherwise the car is bone stock. Before/after numbers RWHP 270.14 / 277.66 (+ 7.52) , RWTQ 276.20 / 288.38 (+ 12.18)
I didn't expect big gains, just removing the throttle lag, adjusting the shift points, and the eliminating the torque reduction was well worth the tune for me.

Fazm

Its your torque converter locking up, just bout every dyno chart for an auto will have that, until you tune it to not do it

05Stang_WI

Wow not much of a mystery after all - Thanks.

I do think it's interesting that it graphs BACKWARDS for a bit...but that may be the software 'smoothing'.

This was the first 05 auto we had on the dyno - lots of std tranny's, but the first auto.

Thanks again, and I guess the converter is just doin it's job.

GI Joe

yup thats lock up.....

Doug@C&L

There's a way to stop it from doing it in the SCT software for a dyno pull as I had to figure it out myself on my own car. I lock the converter in manually so it's locked in as soon as the car is put in 1st all the way through 4th and then I return the settings to stock when I'm through. This makes for a nice dyno curve as you can see in one of my other posts, like K&N vs Stock pull.

The major problem with the converter flash is it gives false numbers. For example the dyno run may be at 270 and then the converter will flash up to 280 because it unlocks and causes a false load and then immediately return to 270 but the dyno reads the MAX hp and that spike would be the max number. So when you add a tuner and get a true 280 all the way across the board if you only read the MAx numbers then you dont gain anything.

Thanks, Doug.

My Blue Heaven

The graph is accurate, your RPM's actually dipped down for a second or two so that's why the graph went "backwards". Make sense?

I saw all of this last February on my car.