Controller to Custom Program/Modify Auto Shift points?

[Z2TT]

Hi,

I want to modify Automatic transmission shift point in 1jz-gte Automatic.
Is there any readily available solution or controller that can do this?

Thanks.

[dumbass]

do a search for automatic transmission ecs
supra stick i think can but its cheap and not sure how good
pcs do trans controllers and are pretty good but expensive
i have tip tronic units for the 1jz and 1uz autos which sort of make them full manual
and u press buttons to shift up and down gears
they work ok but can be a pain if u are tired and just want to put it in D and drive

[wilbo666]

Suprastick and PCS come to mind as options. I've never personally used either.

http://www.latentsolutions.com/products.html
http://powertraincontrolsolutions.com/transcontrol.php#

Cheers
Wilbo

[Z2TT]

Thanks a lot Dumbass and Wilbo, I always thought Suprastic was just a manualized auto solution but it seems you can have it control your actual shift points.
Mainly what I want to do is to get my car to kick down into 1st gear a little bit higher in the speed range than what it does at the moment that is about all.

The hardest thing is going to be programming it to match the original shifting patterns first, is there any diagrams that show the JZZ30 Shift points/ranges etc
that I can work off as a guide avaliable?

Thanks.

[dumbass]

I used to trick my ecu and could control it to shift gears a bit earlier or later
But if u go too far it would hit redline then try to change gears
But if u are on rev limiter ecu won't change gears unless u back off

[Supra967]

$10 manual shift button?

http://www.toymods.org.au/forums/tec...der-%2410.html

Wilbo - do you know if the HKS speed cut defender type 2 will work on an early JZA80 auto? It's apparently got 12 or 16 wires to try and integrate with cruise control and a few other bits that won't be on my car. Loose googling says you can run them in 4 wire mode?

[Daddio]

I've got a SupraStick here...brand new in box with loom and instructions You have my number....

[George]

on some earlier models you may run speedo converter between speed sensor and ecu and lower "speed" by 10-20%, that would do the trick. Newer ecus however (jzs171,jzx110, don't know about jzx100/ja80) will "detect" this trick as torque converter slip and lower engine output somehow.

[dumbass]

The low engine performance is because all ecus retard timing between gear changes

And if u slow speed down to much it changes gears but its still in timing retard mode
And comes out of that mode a few seconds later

The same goes if u hit and stay on rev limiter during a gear change it will stay at rev limit and not change
Gears until u back off

I guess Toyota never thought the auto would change gears so high in rpm so they either didn't program it up there
Or ecu goes into what the fk mode or its a safety thing

[George]

dumbass: my 1998 jzx100 engine/trans is happy to shift even in redline. Just tested it: L, pedal to the floor, 30km/h, 6300rpm, fuel cut. Switch the lever into 2, ecu waits a bit (1.5-2sec) and hits 2nd range (it does close the throttle a bit while shifting, but the whole procedure starts when the engine is in its redline). 3 and 4 work as well. Redlining 4th range needs 160km/h so I din't test it further )

I tried the above speedo converter thing with jdm 5vz-fe and 3rz-fe of 1995-ish years and they worked fine...well I don't know for sure but no one returned with any claims..that usually means everything is ok )

[dumbass]

I'm talking about when u just put it in drive and let ecu control the gear changes
Mine used to hit redline then stay at redline till I backed off if I slowed speed to much
So I adjusted it till it didn't redline
If I manually changed gears using shifter then there's that delay that sux too
That's y I did valve body up and ran tip tronic setup which speeds the gear changes up heaps

[George]

btw it's just ecu that slows down gear shifts so much. JZA80 supra (a/t) even has special button (i-shift or something like that) that speeds up manual shifts.

[Z2TT]

I've got a Shift kit in mine, not sure if it's MV Stage 1.5 or Stage 1, i got told it's 1.5, it clicks into gear so well without being harsh at all, and fast too, I don't get any redlining before gear shifting.

I was thinking about tricking the ECU into thinking your doing a lower speed so it kicks down into 1st more often, but the problem is then It's going to shift too late, because it thinks your going slower than you are, so it will wait longer to shift because your fooling it into thinking your doing a slower speed.

[Daddio]

I was thinking about tricking the ECU into thinking your doing a lower speed so it kicks down into 1st more often, but the problem is then It's going to shift too late, because it thinks your going slower than you are, so it will wait longer to shift because your fooling it into thinking your doing a slower speed.

SupraStick can be programmed independently for up and down shifts (based on TPS position rather than speed, in fact you can have two custom shift maps plus the 'default' map), or driven fully manualised (with option of either lever gear selection or button/paddle shift) This addresses the above issue quite neatly. Maybe one of the gurus can advise if intercepting the TPS signal for the OEM auto would do the same trick? (I suspect not, but I am no guru!)

Oh, the description above of 'not changing up under full load at/near redline' happened to my A340 in the A70 when the 'box had been thrashed to death, initially had to back off the throttle slightly, but as it died more, had to back off more and more...after the 2nd autobox going the same way, I went manual

[George]

sligtly offtopic: Daddio, what did you do to poor A340 to kill it? I know only 2 ways to bring it to death: drive without trans fluid and/or redline engine in N then switch to D.