Mazda 3 5 speed Jatco Automatic

[Gothkid]

Anyone ever hear of chipping or reflashing these transmissions? the 4 speed is discussed here but thats a different tranny altogether. i want to know if anyone can find a flash or chip that will raise line pressure via the pressure regulator, its electronically managed so i don't think an accumulator mod will work. also does the jatco run off of 2 or 3 planetary sets. and if its possible to get another ratio out of it for a 6th gear.

i work for chrysler, as some of you know, and the NAG1 tranny is a 5 speed, but we can reflash it to make 7 gears if need be. but mercades owns the reflash so we kind of cant use it.

 

[Gothkid]

(bump)

 

[Gothkid]

not even ideas? flames?

 

[chrissor]

nothing can be done to them sorry bud. mazda computer systems are pretty tight with the stock parameters. i'm a mazda tech and have tried playing around with stuff, but i have had no luck

 

[Gothkid]

there has to be a way to raise line pressure. would an accumulator mod raise it at all, or force it to shift faster? or would the electronic pressure regulator override it?

 

[rodslinger]

I'd like to know if I can grab a 5-speed auto and easily swap in place of the 4-speed auto. Is the trans controller separate? Communications bus the same? I can get a 5-speed auto for $300. If it's plug and play it would almost be worth the Saturday afternoon to try it out.

 

[Gothkid]

the ecu and tcu, if they are seperate, may not shake hands well and fight eachother....but for that price its worth a try. 5spd = win

 

[Captain KRM P5]

lentech does some stuff with mazda automatics, maybe they have some ideas.

 

[joshritger]

Does anyone know if there is anything tcm/ecu related that could cause the transmission to learn wrong? Basically when I get the tcm/ecu reset or reflashed by mazda the transmission seams to shift great for about a week and a half then it learns "something" and the shifting isn't as smooth or as fast. Also my gas mileage goes down a bit. If I remove the battery terminals and push the brake to reset the ecu/tcm it drives good again for a week and a half or so. Any ideas what could cause this? Oh and I don't necessarily drive it hard, but I also don't drive it like a granny either. Basically it seems to take a lot longer for the tip in/down shift to occur. I have to press the gas pedal further and for a longer duration before it shifts. My car has 33,000 miles on it and the transmission has roughly 15,000 miles on it since it was replaced a year ago.

Oh and the original transmission was replaced because of a lack of line pressure which caused it to shift funny.