CheapXJ
NAXJA Forum User
- Location
- 570, 813 or 303
Anyone have the nerdy details of these sensors and how exactly they work (reed switch, hall effect, input/output voltages. frequency/pulse count for given speeds etc.
the reason I ask, I swapped an AW4 into my 2000 WJ, and I need to generate a .2v to 5v DC sweep that increases and decreases based on ground speed to mimic the input that my WJ's PCM would see from the governor pressure transducer so it stops bitching about it with the CEL. It's the only problem I haven't been able to make go away. at the moment, I literally have all the electronics from the 42re ziptied up into a plastic bag and wired in direct to the PCM. This got rid of all but ONE code, that motherf**king governor pressure bull$hit.
I will make dummy loads for the solenoids (even though it bothers me that my PCM will be wasting power driving its stupid PWM signal into the governor pressure solenoid)
I think I'll be alright with lockup, but if it acts up now and then, I suppose I could let the WJ PCM control the lockup solenoid (it can't do it direct because the impedance is different enough, but dummy load plus relay tap will fix that easily)
basically, my mission is to mimic all the stupid bull$hit a 42re does so my PCM quits its goddamn whining. It's a shame it whines so much because it drives SO DAMN GOOD now! I have NEVER driven a 4.0L WJ that ran like this. It's absolutely awesome. My goal is to provide all the information to make a 50-state legal conversion. This was a cumulative project between myself and good friend of mine that is a Toyota nut. I think I'm converting him. He loves the 4.0L's torque.
my interest stems from the fact that WJs are basically as cheap as XJs were a decade ago, and decent XJs seem to go for more money. I can find 4.0L WJs with blown heads/junk trannies SUPER CHEAP and they're otherwise still in really good shape. I was always impressed with the WJ as a platform, and now that they've been time tested, I know the problems, I want to make solutions, because even though there are practically a billion XJs on the planet (slight exaggeration, lol) these worn out WJs are pretty much the last real Jeeps, aside from the junk tranny and weak heads, everything else on them is as solid as our beloved XJs if not better. a 200k mile unmaintained WJ still drives WAY better than a 200k mile unmaintained XJ (by unmaintained, I mean shot suspension/chassis hard parts. wheel bearings, suspension bushings, balljoints and rodends)
once I have the r&d done, I will release it, likely under a TAPR open hardware license. Basically what this means is everyone can distribute the plans over the internet, it will be free to build but if someone decides to try and mass produce it and sell it for profit I can sue them out of fukkin existence and we won't have another fiasco like AWshifting which, well. I know it was dumb on my part to just post the design on this very forum, but what goes around comes around, and it made me smile to see Brett fail HARD at trying to capitalize on MY design. (the solution to eliminate the OBDII CEL problems was very easy, but the hell if I'm sharing that. I'll take it to my fukkin grave just because I'm fukkin bitter about it) It's not like I didn't put a ton of work into it, it was my capstone project when I was in college for EE and mine only ever existed on a fukkin proto board!
But yeah, anyone who can contribute useful info will get credited for contribution to the project, it doesn't directly earn ya any money (unless i have to sue someone for infringement, in which case it may), but it's an awesome thing to have on a resume.
But I'm older, wiser and more jaded now. so let's do this!
But now it's time for me to pop outside my hotel and go :smoker:
the reason I ask, I swapped an AW4 into my 2000 WJ, and I need to generate a .2v to 5v DC sweep that increases and decreases based on ground speed to mimic the input that my WJ's PCM would see from the governor pressure transducer so it stops bitching about it with the CEL. It's the only problem I haven't been able to make go away. at the moment, I literally have all the electronics from the 42re ziptied up into a plastic bag and wired in direct to the PCM. This got rid of all but ONE code, that motherf**king governor pressure bull$hit.
I will make dummy loads for the solenoids (even though it bothers me that my PCM will be wasting power driving its stupid PWM signal into the governor pressure solenoid)
I think I'll be alright with lockup, but if it acts up now and then, I suppose I could let the WJ PCM control the lockup solenoid (it can't do it direct because the impedance is different enough, but dummy load plus relay tap will fix that easily)
basically, my mission is to mimic all the stupid bull$hit a 42re does so my PCM quits its goddamn whining. It's a shame it whines so much because it drives SO DAMN GOOD now! I have NEVER driven a 4.0L WJ that ran like this. It's absolutely awesome. My goal is to provide all the information to make a 50-state legal conversion. This was a cumulative project between myself and good friend of mine that is a Toyota nut. I think I'm converting him. He loves the 4.0L's torque.
my interest stems from the fact that WJs are basically as cheap as XJs were a decade ago, and decent XJs seem to go for more money. I can find 4.0L WJs with blown heads/junk trannies SUPER CHEAP and they're otherwise still in really good shape. I was always impressed with the WJ as a platform, and now that they've been time tested, I know the problems, I want to make solutions, because even though there are practically a billion XJs on the planet (slight exaggeration, lol) these worn out WJs are pretty much the last real Jeeps, aside from the junk tranny and weak heads, everything else on them is as solid as our beloved XJs if not better. a 200k mile unmaintained WJ still drives WAY better than a 200k mile unmaintained XJ (by unmaintained, I mean shot suspension/chassis hard parts. wheel bearings, suspension bushings, balljoints and rodends)
once I have the r&d done, I will release it, likely under a TAPR open hardware license. Basically what this means is everyone can distribute the plans over the internet, it will be free to build but if someone decides to try and mass produce it and sell it for profit I can sue them out of fukkin existence and we won't have another fiasco like AWshifting which, well. I know it was dumb on my part to just post the design on this very forum, but what goes around comes around, and it made me smile to see Brett fail HARD at trying to capitalize on MY design. (the solution to eliminate the OBDII CEL problems was very easy, but the hell if I'm sharing that. I'll take it to my fukkin grave just because I'm fukkin bitter about it) It's not like I didn't put a ton of work into it, it was my capstone project when I was in college for EE and mine only ever existed on a fukkin proto board!
But yeah, anyone who can contribute useful info will get credited for contribution to the project, it doesn't directly earn ya any money (unless i have to sue someone for infringement, in which case it may), but it's an awesome thing to have on a resume.
But I'm older, wiser and more jaded now. so let's do this!
But now it's time for me to pop outside my hotel and go :smoker: