Brake Controller and Diablo Sport Predator programmer
The 285 tires on my new truck were causing the speedo to be off by around 7% (reading slower than really going), which also screwed the mileage and mpg computer. I had been planning to get a power programmer to mod some of the rev/speed limiter on it as well as try out some more aggressive timings, but was going to wait a little while. Well, I finally just decided...to go ahead and buy a Diablo Sport Predator programmer (it can clear/read error codes, unlock the rev/speed limiter, and compensate the computer/speedo for different sized tires, plus has 5 custom tunes to download for more HP as well as a full real time electronic diagnostic monitor (like boost pressure, ambiant barametric pressure, fuel temp, engine temp, speed, rpms, idle rpm set points, injector flow/pcm, mass air flow, emmissions, etc.). I got it for $350 off Ebay, NIB. Worked like a charm and got the speedo working just right. I'm still getting use to some of the more aggressive tune settings and it is really making the adaptive learning Allison transmission shift points seem flat/harsh and just plain bad (at least on the +65Hp setting). I'm not going to get too crazy until I get a pyrometer for the EGT so I don't melt my turbo.

Also, needed to wire up the electronic brake controller. You have to pay for the "Z82" wiring option (or have it as an option on your truck) to get the trailer brake controller pigtail, the 40A fuse, and a 7-to-4 plug adapter. I got it with mine.

I spent all day trying to figure out what was wrong with my wiring job on my Voyager brake controller in my new truck with that factory supplied pig tail. Triple checked everything and the wiring diagrams. Well, finally, just started volt metering everything out. Turns out, my pig tail had the red power wire in the wrong slot in the factory supplied connector/jumper. It was in the middle left (looking at it plugged in), and it should have been in the middle right (per voltmeter). Every other pin was correct and accounted for (checked brake feed pin and dome light pin). Son-of-a-!#$@!#. Are you kidding me? Working fine now that I swapped it over (the one it was suppose to be in was not filled).

Wow...never would have thought to double check that the pigtail from the factory was correctly wired. Thank god it wasn't wired backwards or it would have fried my brake controller.


- posted by Jeff @ 10:41 PM | 1 comments