Automatic transmission problem

[Styx]

Originally Posted by FRSBRZGT86FAN

I will say this though, it sounds awesome

Thanks very much just to give you guys an update my dad has since removed the supercharger and returned it to stock except for the exhaust. My dad thinks it may be the torque converter because it is back to stock and when the gearbox gets backup to temp and flooring it again it does the same but only lightly now....so we don't know any suggestions, can it be that the thortlebody got too warm and is getting stuck on the shifts or can it be that the thortlebody just has so many shifts before it acts up ??

[FRSBRZGT86FAN]

Originally Posted by Styx

Thanks very much just to give you guys an update my dad has since removed the supercharger and returned it to stock except for the exhaust. My dad thinks it may be the torque converter because it is back to stock and when the gearbox gets backup to temp and flooring it again it does the same but only lightly now....so we don't know any suggestions, can it be that the thortlebody got too warm and is getting stuck on the shifts or can it be that the thortlebody just has so many shifts before it acts up ??

Only thing I can think of is replacing fluids and trying to get a transmission cooler if you plan on putting the supercharger back on. Highly doubtful of a throttle body, throttle bodies don't get stuck and skip up RPMS and dance around like that, it's something mechanical related to the transmission, may be time for an SSP clutch pack install and valve body replacement....

[cdrazic93]

Something mechanical. Im putting my money on the TQ converter.

[onzippy]

Originally Posted by Styx

Thanks very much just to give you guys an update my dad has since removed the supercharger and returned it to stock except for the exhaust. My dad thinks it may be the torque converter because it is back to stock and when the gearbox gets backup to temp and flooring it again it does the same but only lightly now....so we don't know any suggestions, can it be that the thortlebody got too warm and is getting stuck on the shifts or can it be that the thortlebody just has so many shifts before it acts up ??

Styx.. ECU also back to factory tune?
Is really unfortunate for you/us all... Now I wonder how much longer I have left in my AT.

[FRSBRZGT86FAN]

Originally Posted by Styx

Thanks very much just to give you guys an update my dad has since removed the supercharger and returned it to stock except for the exhaust. My dad thinks it may be the torque converter because it is back to stock and when the gearbox gets backup to temp and flooring it again it does the same but only lightly now....so we don't know any suggestions, can it be that the thortlebody got too warm and is getting stuck on the shifts or can it be that the thortlebody just has so many shifts before it acts up ??

Originally Posted by onzippy

Styx.. ECU also back to factory tune?
Is really unfortunate for you/us all... Now I wonder how much longer I have left in my AT.

It's kind of worrying unlike the manuals which have proven themselves for the most part reliable till 280 whp+ on stock clutches and such, the autos haven't had much testing in that department.

[Styx]

Originally Posted by FRSBRZGT86FAN

It's kind of worrying unlike the manuals which have proven themselves for the most part reliable till 280 whp+ on stock clutches and such, the autos haven't had much testing in that department.

Yea well according to some the gearbox can handle 450HP easily!! I think those guys just forgets to mention the gearbox upgrades.!

Just to remind everything is back to stock the motor,ECU everything except the exhaust with a high flow cat in and axle back exhaust in. The problem exist still but we don't know what the problem is really and is scared to buy a new well anything because we may end up paying for something that wasn't needed... Just scared for the cost, for the most part other then that we would love too get it fixed.

[FRSBRZGT86FAN]

Originally Posted by Styx

Yea well according to some the gearbox can handle 450HP easily!! I think those guys just forgets to mention the gearbox upgrades.!

Just to remind everything is back to stock the motor,ECU everything except the exhaust with a high flow cat in and axle back exhaust in. The problem exist still but we don't know what the problem is really and is scared to buy a new well anything because we may end up paying for something that wasn't needed... Just scared for the cost, for the most part other then that we would love too get it fixed.

I'd recommend taking it to a dealership, they'll be able to fix it if it is a TCM issue, they'll also be able to diagnose if its a mechanical issue at which point it can be taken to a transmission shop for much cheaper

[Styx]

Originally Posted by FRSBRZGT86FAN

I'd recommend taking it to a dealership, they'll be able to fix it if it is a TCM issue, they'll also be able to diagnose if its a mechanical issue at which point it can be taken to a transmission shop for much cheaper

We have replaced the transmission fluids 2 times have taken it to toyota 2 times and none of them can tell us what is wrong.

[@Art_Mighty]

So I just wanted to chime in and say that I'm also running into the same issue.

I'm boosting 8psi on a AVO kit and I will be taking that up to 12 psi with E85 soon.

I'm getting a tyranny rebuilt by SSP with a set of their Stage1 clutches, their stage 2 valve body and their higher stall torque converter. I'll report back what I find after I have broken in the transmission and put a 1000 or so miles on it.

[KoolBRZ]

I have a theory, and I'm putting it out there for the back-seat drivers to shoot holes in and insult me, but also for the few serious tuners to try out and see if this fixes the problem.

Since these cars are Drive-By-Wire, it would make sense for the pedal input to be sent to the transmission controller. What if the DBW table is too aggressive? What if the table just needs to backed down some so the car is making the same power at the same pedal travel, and really cranks up at the end of the travel? The MT DBW table is less aggressive than the AT DBW table. Maybe try that out and see if there is any difference in the full-load shifting problem. I personally would like it if someone found some kind of back-door into the TCU with Toyota's Techstream software.

[FRSBRZGT86FAN]

Originally Posted by KoolBRZ

I have a theory, and I'm putting it out there for the back-seat drivers to shoot holes in and insult me, but also for the few serious tuners to try out and see if this fixes the problem.

Since these cars are Drive-By-Wire, it would make sense for the pedal input to be sent to the transmission controller. What if the DBW table is too aggressive? What if the table just needs to backed down some so the car is making the same power at the same pedal travel, and really cranks up at the end of the travel? The MT DBW table is less aggressive than the AT DBW table. Maybe try that out and see if there is any difference in the full-load shifting problem. I personally would like it if someone found some kind of back-door into the TCU with Toyota's Techstream software.

I've looked into the later, the only thing you can do in techstream is reset the TCM. I also think there was an option to update the TCM logic if neccessary.

[FRSBRZGT86FAN]

Originally Posted by @Art_Mighty

So I just wanted to chime in and say that I'm also running into the same issue.

I'm boosting 8psi on a AVO kit and I will be taking that up to 12 psi with E85 soon.

I'm getting a tyranny rebuilt by SSP with a set of their Stage1 clutches, their stage 2 valve body and their higher stall torque converter. I'll report back what I find after I have broken in the transmission and put a 1000 or so miles on it.

How long have you had the turbo? And how well did the transmission behave before the rebuild?

[nos145]

Originally Posted by Styx

We have replaced the transmission fluids 2 times have taken it to toyota 2 times and none of them can tell us what is wrong.

soooooo. do they know u had a SC? cuz if they can't fio they need to replace the tranny. or at least the torque converter.
i've seen some boosted animals running beefed up converters without this issue... so as a last resort, you could get one and then send in your core

[@Art_Mighty]

Originally Posted by FRSBRZGT86FAN

How long have you had the turbo? And how well did the transmission behave before the rebuild?

I've had the turbo for about 16 months. The really alarming symptoms have happened in the last few months. Especially when it's really cold outside.