Supra A342E gearbox

[THOR Racing]

F.Y.I

Some info found on lexus site: (Thanks to UK Supras)

Might help to understand the auto box some more.

 

Although Toyota was already recognised as one of the leading companies in transmission development, thanks to the four speed 'ECT' electronically-controlled automatic gearbox, for the F1 project, Yasuro Suzuki (General Manager, Drivetrain Engineering) and his team set about developing a new "intelligent" transmission, later christened ECT-i.

The result was the A342E gearbox featuring a computer that "talked" to the engine's CPU to retard ignition timing for a split second during shifts. This reduced engine torque, lessening the load on the transmission during changes, helping them to be much smoother. In addition, the transmission's clutches were controlled electronically to apply more or less hydraulic pressure on the clutches as necessary. Therefore, if the driver accelerated gently, the clutches engaged lightly instead of always with full force, again producing smoother shifts.

A new high efficiency 'super-flow' torque converter with a lock-up clutch (a Toyota innovation from 1980) was also developed, and the housing was connected directly to the sump for greater rigidity. Finally, in line with the desire to reduce maintenance costs, a new longer lasting mineral oil-based transmission fluid was introduced to extend service intervals.

There was a console-mounted switch to enable the driver to choose between 'Power' or 'Normal' programmes in the gearbox. The Power mode caused shifts to occur at higher engine speeds for sharper acceleration response, while in the Normal mode, the programme instructed the transmission to move into the overdrive fourth as soon as possible to enhance fuel efficiency.

In the battle against NVH, the engineers bestowed the same amount of time and effort on the driveline and differential. By tilting the engine back slightly, they were able to arrange the two piece propshaft in a straight line from the engine to the differential, thus eliminating potential vibration points. They then put a high precision universal joint in its centre, and flexible couplings at each end, to ensure that even the slightest deviation from this theoretical straight line was compensated for.

 

[Fly]

So as this box comes mated to the v8 1UZ is it safe to say this is a fairly strong autpo box comparible to the stock tt box? just trying to understand as i may have one lying around that i dont need

[Chris Wilson]

Just look at the stock torque figures for both engines to have a guide as to the torque rating of the gearbox. As to whether actual gear RATIOS are suitable? That will need investigating.

 

This was quite some thread revival! I had no idea the forum still showed posts from 2002.

[Fly]

Well i cannot be blamed for not using the search function, i didnt htink about the stock torque figures, rom what i have read the ratios are very similar except in one gear. This is not for my own use but maybe to sell on as a complete conversion/upgrade. ile look out the torque figures thanks Chris

[Guest crystal]

The A342E is also used on the 1UZFE, IIRC. http://dailydigitaldeals.info/wp-content/uploads/2012/01/11/20/buy.gif

[jamesmark]

Thread resurrection of the year contender?

[Fly]

after speaking with david, the master of the auto box he metioned that its comparible to the NA auto box but with a torque converter in between the NA and TT although he mentioned it is rumoured to have a stronger oil pump. I was hoping it would be a good box for someone to have with all the bits.