How do you like your AUTOMATIC supra?

[TurboStreetCar]

Don't know the 340 is the first electronic controlled trans I've used, any other auto car I've had always ran a TH400, dumb but effective at the time.

I assume cars that come with button/paddle shifters don't behave that way.

:biglaugh: @ first comment. I forgot about the new cars with the paddle shifters, those seem to lock in whatever gear you select so i guess they changed the design.

Prolly made every gear engage with a clutchpack or band rather then rely on one way sprags.

I dont like how those trannys shift though, They take too long, and the ignition cut bogs the car into the ground on each shift, Manual OR auto mode. At least the Vettes are this way.

 

[csnow]

setting off the intake full of fuel turning it into a big ass pipe bomb!

The public admission that you are a self-attacking terrorist. Nice Ian :icon_eek:

 

[gobutai]

You will need to find a way to dump more heat, as that has always been the downfall of autos & road racing.
And as some people have touched on, down shifting is problematic for that sort of thing.
That is why I am adding the SupraStick, to keep it in the gear I want.
More than once mine has decided to go into a taller gear entering a corner when I let off the throttle, and dropping the engine out of the powerband for a short bit, then downshifting under full throttle, which led to an istant spin :aigo:

This is the main reason I'm looking to swap an r154 - road racing - gear selection is definitely a big thing for this. I had a couple of incidents in a corner, where I was fighting to keep the car together since the auto was in what I perceived the "wrong gear." Then again, the mkiii is a new chassis for me, and I'm still learning how she behaves...

What do you all think then - is it a matter of what type of racing / what you want to achieve with the car then???

 

[Zumtizzle]

Nope! Has it gotten better?

Feel free to come on by!

It's under new management.

 

[TurboStreetCar]

SF is getting turned around?

 

[IJ.]

SF is getting turned around?

Bit like shovelling snow with a toothpick though

 

[gofastgeorge]

SS won't help with the downshift issue it's a design flaw with the 340 George.

Ian,
You ruined my day..........
Crap!
Now I will probably not put it in.
I was looking at doing my own circuit that would directly control the solenioids, without using any of the OEM electronics,
Maybe I'll put more thought into that......

 

[IJ.]

Ian,
You ruined my day..........
Crap!

Sorry G....

As I said though you can drive around it using the Shifter/OD button but it's never going to drive like a GM trans with a full manual valve body.

 

[TurboStreetCar]

Bit like shovelling snow with a toothpick though

Haha Figured. Found it hard to believe.

Ian,
You ruined my day..........
Crap!
Now I will probably not put it in.
I was looking at doing my own circuit that would directly control the solenioids, without using any of the OEM electronics,
Maybe I'll put more thought into that......

The ssv4 can be used standalone. It's the only thing hooked up to my transmission. It's about as direct control as you can get.

 

[Reiketsukan]

Feel free to come on by!

It's under new management.

I'll have to do that!

 

[Zumtizzle]

SF is getting turned around?

Stop by. Be the judge.

I was sad when it went downhill.

 

[YouGotSpooled]

Well thanks for all the opinions. Im going to drive before I buy and see how I like auto!

hey Reiketsukan, enjoying all the stuff you bought?

And thanks for the amusing bash fest :biglaugh:

 

[Reiketsukan]

Well thanks for all the opinions. Im going to drive before I buy and see how I like auto!

Excellent! You never know till you try! Here's hoping that the auto in that car is in as good condition as mine!

Hey Reiketsukan, enjoying all the stuff you bought?

Well, the clips I bought for my rear interior panel were too short, but no worries! The down pipe I bought I actually fixed up and sold to one friend so I could buy a header-wrapped divorced DDP from another. :naughty: And... Didn't I buy my HKS SSQV from you too? If so, it works beautifully and I love it! Did I miss anything? lol

Edit: Do you have anything left that you want to sell?

 

[YouGotSpooled]

Yes the BOV was from me haha.

And I have some forged pistons im pulling out of the block soon if your interested in those. Not sure if I have any goodies left.

 

[SideWinderGX]

Ran mine for 40,000+ Km's @ 500rwhp with no sign of stress and am that confident I reused the 340 with the 6.0L Chev, I'll go through it and give it a freshen up but I doubt I'll find much wrong in it as it's never cooked up the oil.

I use the Aristo valve body/PCS controller combo and with this you can tune every aspect of the trans operation.

Nice gentle shifts while cruising around town and violent neck snapping shifts under power, I added in some shift cut to reduce power on the 2>3 and 3>4 shifts and will do the same on 1>2 with the Chev so it doesn't tear up the trans/car as even with the 7M it was shifting hard enough to be heard/felt through the dash support as it flexed.:aigo:

The shifts you experienced were with an IPT ordered tranny correct? Not just parts you put on yourself? Thanks ahead of time

I like my auto so far, have yet to figure out why my boost spikes between shifts (about 3 psi each shift), causes me to hit fuel cut...but other than that it's daily driven, almost 170k miles on the clock and works like a charm!

It started slipping on the 1-2 shift a few months ago but that was because of a leak in the rear housing seal, I was half a quart low for a while. Filled it up, checked the cooler also (no leaks!) hasn't skipped a beat since.

 

[TurboStreetCar]

The shifts you experienced were with an IPT ordered tranny correct? Not just parts you put on yourself? Thanks ahead of time

I like my auto so far, have yet to figure out why my boost spikes between shifts (about 3 psi each shift), causes me to hit fuel cut...but other than that it's daily driven, almost 170k miles on the clock and works like a charm!

It started slipping on the 1-2 shift a few months ago but that was because of a leak in the rear housing seal, I was half a quart low for a while. Filled it up, checked the cooler also (no leaks!) hasn't skipped a beat since.

IJ had a tranny built by another shop on his side of the pond.

The boost spike is normal, i have the same effect on my car, its from the increase in load the engine is put under when the shift is made. I used to hit fuel cut because it of also haha.

On my old tranny i would notice a 1-2 slip also when it was low on fluid. I hated that.

 

[IJ.]

Combination of the MV Auto's shift kitted valve body and the way I had the PCS trans controller adjusted to shift.

 

[SideWinderGX]

IJ had a tranny built by another shop on his side of the pond.

The boost spike is normal, i have the same effect on my car, its from the increase in load the engine is put under when the shift is made. I used to hit fuel cut because it of also haha.

On my old tranny i would notice a 1-2 slip also when it was low on fluid. I hated that.

That was my only guess (no boost leaks or EBC problems) but didn't want to believe because I can't fix that :icon_razz Good to know someone can verify though, thank you!

Combination of the MV Auto's shift kitted valve body and the way I had the PCS trans controller adjusted to shift.

Gotcha gotcha, been juggling whether I want 550s or a valve body from IPT this summer so that helps.

...PCS? Clue me in and I'll go search/google/all that good stuff :biglaugh:

 

[IJ.]

I use an Aristo valve body now with the PCS controller, the benefit to doing it this way is no line pressure cable (an issue for me being DBW) and the PCS controls the ACCUMULATOR Solenoid.

One of the mods you do in a 340 is to either shim up the ACCUMULATOR springs or replace them altogether with solid rods to make it shift harder, you end up with firm to hard shifts all the time, in an Aristo valve body they run a solenoid controlled bleed and this is where you adjust shift "feel" making a shift kitted valve body redundant.

 

[SideWinderGX]

Ahh, so the PCS enables you to adjust the solenoid ( so to speak) instead of it being set in stone as the 'regular' valve body mod goes, I see. Makes sense, thank you!

Did you ever use an IPT valve body in the past or just work with the Aristo's? I'll have to call them up and ask what they do to the A340E valve bodies, I hope it's more in depth than just replacing the accumulator springs (for ~$700 I would hope it is).