trans tuning.

[mustang_gt_350]

Originally Posted by Power Hungry

There are 2 switches which control the trans and converter states.

Switch 1 will turn on or off the ability to lock the trans into a specific gear. There is a values that is used in conjunction with this to select the gear in which to stay locked (1, 2, 3, or 4).

Switch 2 will turn on or off the ability to lock the converter. On 94-97 this is simply an on or off state. On 99 and later, it is used in conjunction with with a value that determines the pulsewidth in which to lock the converter. Normally, this would be set to 100%, but if you're really curious as to how fast you can fry your converter clutch you could set this to 25% or 50%.

We frequently do "sled-pull" applications on a chip that goes something like this...

Pos 1: 2nd Gear, Converter Unlocked, Fuel Curve modified to spool and light turbos
Pos 2: 2nd Gear, Converter Unlocked, Pulling Fuel Curve
Pos 3: 2nd Gear, Converter Locked, Pulling Fuel Curve
Pos 4: 3rd Gear, Converter Locked, Pulling Fuel Curve
Pos 5: 4th Gear, Converter Locked, Pulling Fuel Curve
Pos 6: Normal Operation, Light Fuel Curve

Instead of 1st gear, we can also set up to start in 1st gear.

These types of strategies work really well because they completely bypass most of the delay circuits in the shift strategies and just grab the gear desired. The only drawback is that you have to be very careful when switching or you could accidentally skip a position and jump 2 gears instead of 1. In a bouncy truck it's quite easy.

Anyway, just some thoughts.

Great post. So you would actually be switching tunes as you go down the track? So position 1 would be the spool/off the line tune then once rolling you would hit the next position? Then if you want to lock the converter just go to the 3rd position. Also what would be your thoughts about pulling with the converter not locked vs locked? I know the heat would be very high but do you think there would be a benefit to it?

Edit: SO also if i'm reading this correctly that means you could have the truck in Drive, and if you burn a position on the chip that when selected you would be starting out in 3rd gear?