Question about the A Series Transmissions...

[Kai]

The cable made no sense for me either - but i was concentrating more on the internals. For a box rebuild, what am i looking at getting, parts wise, aside from the obvious gaskets & oil seals? Clutch packs & brake bands?

 

[IJ.]

Buy a rebuild kit from IPT it's complete with all the parts needed.

 

[tcsupra]

If you have the pcs controller do you need to shim the valves?

 

[IJ.]

If you have the pcs controller do you need to shim the valves?

If you're running the stock 340 valve body yes, if swap in a later model 343 full electronic one then no.

 

[Kai]

A few question's, Ian - what is the line pressure cable there to 'do' exactly, just regulate fluid flow? If you either a) remove it, or b) set the cable to a fixed position - what'd happen?

Also - the 343 valve body - i'm guessing that no Toyota that came with an A343 had a separate ECU for the transmission, leaving either the Engine/Transmission/ECU combo, or a PCS as the only option for controlling it?

 

[IJ.]

Line pressure cable modulates the line pressure based on the throttle position, so when you're at light throttle the pressure is lower and you get softer shifts and less parasitic loss then when you're at higher throttle there is minimal slip on shifts Kai.

I don't see any reason to lock the cable there is 0 performance gain from doing so contrary to popular Supra Genii SOP.

Pretty sure anthing that used a 343 had the ECT built into the main ECU so yes a PCS is about it, I ran a SSv4 with mine and had it talk to the MoTeC so it could PWM the line pressure and TC lockup, I wasn't using the Accumulator PWM Solenoid at that time.

 

[Kai]

Aaaah - thanks for clearing that up Ian! I'm about to embark on a project in that case, bring on the microcontroller (going to MAKE a programmable transmission controller to fit in stock location).

This is a custom controller based on an ATMega168 in a MS65 Crown + A340E:

[video=youtube;er6DAlQLBBA]http://www.youtube.com/watch?v=er6DAlQLBBA[/video]

Imma make one too!

 

[IJ.]

Just make sure it can do PWM output or it's a WOTAM

 

[Kai]

Yep - ATMega168 MCU has six PWM channels

 

[IJ.]

Cool never need a shift kit again

 

[Kai]

23 I/O channels including the 6 PWM channels...how many are you using 3? I know solenoids 1 & 2 are standard, but are 3, 4 & 5 (including the TC Lockup) all PWM?

 

[IJ.]

LP, TC and ACCUMULATOR are all PWM

 

[Kai]

TC is Torque Converter, Accumulator is....line pressure? But what is LP?

Trying to figure out what MOSFET's i need to drive from the MCU, and what switching speed!

 

[gennro]

TC is Torque Converter, Accumulator is....line pressure? But what is LP?

Trying to figure out what MOSFET's i need to drive from the MCU, and what switching speed!

LP is line pressure I believe

 

[Kai]

Blonde moment! >_<

 

[IJ.]

Accumulator = Shift Kit and sets how harsh/gentle the shifts will be.

 

[Kai]

Bit of info - but, the '92-'98 Volvo 960 uses the A30-40LE which is by the looks of it, an A343. Whats interesting however, is that the transmission control is a SEPARATE UNIT. In addition to the transmission controller i'm designing, i'll have a look into whether this can be retrofitted into ours along with the valve body from it. Whatchoo reckon Ian?

 

[IJ.]

Depends on input/output splines counts Kai, if you're building a controller why bother?
(people junk 343's all the time it shouldn't be hard to find a valve body)

 

[Kai]

I meant swapping out the A343 valve body and just using the Volvo transmission controller to operate it. I'm still building a trans controller - but it might be easier for some people to do a plug & play job instead of building one and programming the AVR (i could offer it as a kit i guess).

BTW Ian - can i possibly trouble you for two more things? One: How have you set up your PCS - got a config file you'd share?

Two: Could you approve the topic i started for the trans controller?

Cheers!

 

[IJ.]

Got a link?

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