dyno tune disaster

**707chance** · 06-22-2011

There is a folder in the HPTuners editor called Transmission Diagnostics where you can find a few parameters that restrict gear command. Our STOCK numbers are set at 5500 rpm and 62 mph. The rpm and mph must be UNDER these two parameters to enable gear control. MY current modified file on the car is set at 6200 rpm and 188 mph. Looking at my scan, the mph was at 145 mph, below the 188 requirement, and rpm was at 6050 which is under the 6200 rpm requirement which will allow gear command. This explains not only how it is possible to occur but why guys with stock trans tunes or just ratio changes cannot command a downshift when going over a certain speed.

The TC used in my transmission package is not designed to be locked during WOT. The TC was locked during the dyno testing and could have been damaged. Debris could of then of been throw back into the transmission.

**BillBoost37** · 06-23-2011

Stop me if I'm being a pain, because that's not the intention at all. RPM limiter wea removed?

**707chance** · 06-24-2011

the parameters were changed that allowed the car to be downshifted in manual mode...so I would have to say not remove but changed

**iroc2** · 06-25-2011

wqhen doing a dyno run you want to have it in 3rd only, to do that you need to put the shifrt to the 3rd gear selection and then you start your pulls in lower rpms, and take your foot off right as the needle kisses redline....

so far it almost sounds like its their fault to me...

**OrangeL67** · 06-25-2011

Originally Posted by iroc2

wqhen doing a dyno run you want to have it in 3rd only, to do that you need to put the shifrt to the 3rd gear selection and then you start your pulls in lower rpms, and take your foot off right as the needle kisses redline....

so far it almost sounds like its their fault to me...

^ This.

And not to sound blame happy, but the bottom line is: It was somebody's fault and because of that, your gonna have to come out of pocket. And let me give you a hint. That somebody is the tuner, or you. Oh and another hint: It wasn't you

**tkennedy88** · 07-11-2011

I would talk to a lawyer at the very least. You need to make sure it is one that comes highly recommended. I'm telling you this because you need to make sure you do not get screwed. Would you want this to happen to someone else?