Sprintex 3.6 pentastar install

[bo9roadking]

Sounds like Sprintex has figured out the auto transmission. Magnuson is still trying to get the auto shifting resolved. With the latest tune that I have, the transmission will shift on its own at about 3k rpm from 1st to 2nd, 2nd to 3rd is about 4.5k rpm, and the other gears are at about 3k rpm. I can manually upshift at a lower rpm or let off the gas slightly to shift sooner if I want. Wide open throttle shifts just prior to redline on its own unless I manually upshift.

I can live with the way it shifts around town, but it definitely doesn't shift like it did when it was stock. My main problem with this tune is that my overdrive is almost useless. On level ground or downhill, overdrive works. Any incline that requires throttle input to maintain speed will kick the transmission down to 4th gear and it will stay there for a long time unless I manually upshift it. There are some sections of the interstate that I have to deal with higher rpms in 4th gear because manually upshifting only lasts for a few seconds and then it downshifts back to 4th on its own. If I continue to manually force the transmission into overdrive, it will shift up and then back down as soon as I manually upshift like a yo-yo. I live in Texas and the interstate is not in the mountains or any hilly terrain. I'm talking elevation changes of maybe 20-30 feet. If I hold the gas pedal and don't try to maintain highway speed, the transmission will stay in overdrive, but I'll lose about 5mph in the process. If I press the gas pedal to maintain speed, it drops out of overdrive.

For a power adder, I would think the extra hp/tq of the SC would cause the transmission to downshift out of overdrive less often instead of more often than it did when it was stock because the extra power would keep things moving without requiring a transmission shift. Magnuson has been working on a new tune for over two weeks, but SEMA has slowed down progress. Hopefully I'll get better results with the next tune.

[Pznivy]

Sounds like Sprintex has figured out the auto transmission.

^^ This i do not buy. They always talk like this when no one has the unit. they love to say "We've solved all the problems that the other SC companies have struggled with for years". No one should believe that. A power mod has too many variables for it to be perfect, in your area, on your gas, on your jeep.

They need a bunch of jeeps everywhere installed and logging to get enough data to make the tune perfect. It takes a long time. JL had the first pentastar RIPP, they will agree with this. JG had the first turbo, and Prodigy said their tune was perfect. It wasnt.

Only when a few people NOT attached to sprintex confirm its perfect would I believe it.
.