A340E transmission problem

[PlacentaJuan]

i have had this wierd problem with the transmissions (aristo 2jzgte and box into mx83 cressida, the box was modified with the stock cressida box output shaft and housing so it would bolt up to the cressida)

what happens is when im cruising in the hills, after about 30mins the gearbox will hesitate before downshifting (i will keep the car in 2nd most of the time due to the corners etc, but on a straight will shift into 3rd) and when i downshift to 2nd gear, there will be an initial pause of about 1/2 a second, and this will quickly increase in the next 20 mins until a downshift from D to 2 will take about 4 seconds! (2 seconds to turn off OD and 2 seconds to go into 2nd)

this is a bugger when you are expecting a gear change before a corner, and i end up carrying too much speed into the corner, then the car will downshift at the apex and seriously fuck up your driving.

so first i assumed it was due to overheating (cox a hills run the car gets thrashed a bit) and added a second transmission cooler, which didnt do anything.

recently i added and temp sensor, and while it takes about half an hour to get up to temp (prolly coz of the 2 coolers) the same fault started happening the other night when i went into the hills to look at christmas lights.

i wasnt really thrashing the car, and tranny temps were 150f-160f which is right in the sweet operating temp.

so now i have no idea why this is happening, or what i can do to diagnose or fix it!!

i am assuming the box thinks there is a fault somewhere and trying to fix it, but this problem has not happened anywhere except the hills (street driving ok its pretty cruisy, but even at the drags this doesnt happen)

only thinkg i can think of is a speed sensor is missing, and while mos tricked the aristo ecu to think everything was sweet, that fault light came back on when i swapped to a jza80 ecu, but this fault light flashes all the time, regardless of auto problems (the OD light flashes to tell you there is the backup speed sensor missing??)

maybe i can try the aristo ecu and see if this fixes it, but dunno where to get one to borrow.

pls give ideas.

[wilbo666]

If the OD light flashes, have you tried pulling the auto diag codes from the ECU?

Cheers
Wilbo

[cambelt]

The overdrive light stays on because of the supra ecu ( Im still working on it). Does the box flare during the change or stay in the taller gear then change.
Dave

[madmont]

Did you retain the stock aristo speed sensor?
see previous post
http://www.toymods.net/forums/showth...645#post401645
http://www.toymods.net/forums/attach...8&d=1174259224
http://www.toymods.net/forums/attach...9&d=1174259246

[PlacentaJuan]

all speed sensors are stock 7m sensors.

apparently i am missing one sensor and that is why the od light is flashing, but except for this wierd problem that "only happens in the hills!?" works fine under all loads and speeds.

box does not flare or do anything else unusual, just hesitation after manual downshift command.

thanks madmont, did you see my thread about the kickdown switch and the one about the cruise control neutral wire preventing cc working? (noticed thread hasnt been updated for a while)

[131OWN]

This is not the answer to your question, but if it was me, I would manualise it with one of my shift boxes, and change out the 2jzgte auto valve body for a 1jzgte shift kitted valve body with kickdown cable, then the Factory ECU has no control over the transmission.

[PlacentaJuan]

yes i would quite like to do that, however auto ratios i dont think are the best for running manual, especially all the time, first gear is a real bitch in the auto for a start.

i would definately be interested to test drive a car with manualised auto, and even better if you could switch between "auto auto" and "manual auto" AND have paddle shift then i would seriously consider it.

dont think i can use a kickdown cable without changing the whole gearbox though

[131OWN]

I have swapped a few 1jzgte valve bodies into 2jzgte transmissions and added the kickdown cable, all the provisions are in the 2jzgte transmission to do this. I have mainly done it for conversions.. .. Plus They are a stronger box.
My a340 is manualised and first gear is great, you can still stall it up as so on. I've sold a few manualise shift boxes over OZ, there will be someone around that will take you for a spin, or next time you come to Bris PM me I wouldn't have performance car any other way.

[river]

Hi,

Let me answer this in a similar manner to how you helped Burna with his 32-bit windows problem.

I can tell you are a gearbox noob, so I'll help you this time.....

Hoist the car up, undo all the bolts that hold the tranny in place, then remove the box. Find a manual gearbox and put it in. Problem solved!

seeyuzz
river

[PlacentaJuan]

Hi,

Let me answer this in a similar manner to how you helped Burna with his 32-bit windows problem.

I can tell you are a gearbox noob, so I'll help you this time.....

Hoist the car up, undo all the bolts that hold the tranny in place, then remove the box. Find a manual gearbox and put it in. Problem solved!

seeyuzz
river

then after that i suppose ill just find a spare left leg lying around somewhere and attach that to my stump shall i?

[web]

You've already been resourceful enough to build hand throttle - how about hand clutch next?

From pushing the pedal by hand I've noticed it's not all that heavy either. If still too heavy or too much travel to make it light enough, some form of power assist could be devised.

[PlacentaJuan]

yes but then i think there would be trouble at the drags with no hands on wheel.

besides, drags is the only 'official' motorsport i am interested in and for that an auto is better anyway.

also, because i cant use my left leg, i need a lot of room in the space where a clutch wouldnt normally be, (but if i did your idea there wouldnt be a foot clutch anyway)

so i suppose the easyest fixes we have some up with so far are:

* test aristo ecu. this can not be a permanent solution since the supra ecu fixes the 'false rev limit' and there is no fix for it otherwise. if the new ecu fixes the problem then put the supra one back in and...:

* have a drive of someones car that has one of those manual shift kits. im still worried about the lengh of fist gear, it seems way too short. (even on the smallest street corner it maxes out before the apex and to shift into second makes the back end come out)

ill pay attention next time i am in bigworms 1jz and see how 1st gear feels iwith the 1jz auto and maybe give 131owns idea (if it works i can piss of the ecu alltogether and go aftermarket woohoo)

[Mos]

You could try unplugging the solenoids to see whether the problem is hydraulic or electronic (with no solenoids the shifting is entirely hydraulic as you're using the shifter).

You could jump on the hassle Mos bandwagon (Linden and Stitt want an independent controller for the solenoids).

Mos.

[1JZ.747]

your in south australia, how far are you from MV in blackwood.

[Ribfeast]

Get a SupraStick with the paddle shifters etc, and tune the shift points the way you like it