Right now it's just straight pipes with the big 6.0L cats. Pretty chill at idle, but it gets ROWDY when you step on it.Originally Posted by ItHurtz
Couple more items off the checklist. Got the fuel gauge working. Just needed to run the sender wire to ground through the level sender.
More importantly... It shifts! Took it around the block and it slid into 2nd. Didn't want to take it any farther than that. With a 2.73 rear end and a 235/75-R15 tire, you run out of road pretty quickly. Anyhow, the math to get that Dakota Digital pulse generator was pretty intense (for a dummy like me at least). I never would have figured it out without the help of Brendan at LT1Swap.com. Big shout out to that guy. Here's the story problem math I used to get it working. The numbers are specific to my application and the tire I plan to run in the future, but the math should work for anyone looking to do the same thing. I'm mostly posting for my own future reference. Everything was done using HPTuners.
First, apply the 31” tire size (30.5 actual) and 2.73 axle ratio correction to all the shift tables using the "Gear/Tire Wizard." Leave the 40 pulse per trans rotation setting alone for now.
Trans revolutions per mile:
Tire size (30.5" diameter, OR 684 revolutions per mile) multiplied by the axle ratio (2.73), will result in 1867.32 drive shaft revolutions per mile. *Calculated by Gear/Tire Wizard*
VSS P/Rev - Trans:
8 pulses per rev (Dakota Digital output) DIVIDED by 1.9444 (35 driven / 18 drive) from the speedo gear output. Equals 4.11438 Pulses per trans revolution *Manually calculated*
VSS Pulses per mile:
1867.32 (drive shaft revolutions per mile) DIVIDED by 1.9444 (sensor revolutions per driveshaft revolution). Equals 960.358 sensor revolutions per mile. 960.358 (sensor revolutions per mile) times 8 (Dakota Digital pulses per revolution output) equals 7682.864 Pulses per mile. *Manually calculated*
All that's left on the short list is the trans cooler. Just set the 40k in place for now:
