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Location:
Melbourne Vic
Registered:
October 2002
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A340E Auto Cressida Transmission & 1JZ-GTE
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Wed, 23 October 2002 15:04
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Hi, im considering putting a 1JZ in a cressida, and was interested to know if the stock gearbox was upto it, and if so how far can it be pushed (power and toque output wise?), if not whats the next best thing (1/2 cut chaser gearbox (A350E?))
Not all that interested into going to a manual gearbox.
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Location:
Perth
Registered:
September 2002
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Re: A340E Auto Cressida Transmission & 1JZ-GTE
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Wed, 23 October 2002 17:07
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firstly - i doubt it would be up to it after a while of punishment (mx83 i'm guessing)
secondly - i would hate to try and wire up the A340E to a 1jz ecu!
thirdly - muuuuuuuch easier to get a cut and drop the whole she-bang (engine + box) into it
guarenteed to be smoother and handle the stock 1j + more
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Location:
Adelaide
Registered:
June 2002
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Re: A340E Auto Cressida Transmission & 1JZ-GTE
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Thu, 24 October 2002 00:38
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Hi mate. To answer your question about the A-340, they are quite capable of dealing with a decent motor if you look after them. By that I mean don't flatten your foot and have it jump back to 1st at max boost etc (common sense really), fit a massive trans cooler, have it checked out and clutches replaced if needed etc. The thing to know about the a340 (and the later boxes too(they are all pretty much the same mechanically, but later autos tend to have the line pressure cable replaced by a variable solenoid that is computer controlled) is that second gear is the one to watch. With only 4 clutches it will be the first one to go. Keep in mind however, that taken care of they will tolerate 400-450 hp(I ran around 450 through mine and it survived fine). An uprated valve body with the line pressure increased to 200 psi also helps. With second modified to take 7 clutches the box becomes a relatively formidable unit. Using a different friction material can make it even tougher-but then, as with all boxes-broken input shafts etc can start to happen (talking VERY big power though).
If you're getting an import motor-try to grab one with the auto attached and use it as it will be newer and (probably) in better nick than the one you have. If you are going to use the factory ECU and trans computer-no worries, otherwise, if an aftermarket ECU you can also make the box a full manual shift eliminating the need to try and hook up the trans computer. (if going the full manual route get an auto with a line pressure cable-not solenoid setup)
The new box will be easy to fit up to the car-and may even use the same tailshaft (a cressida/1JZ person should be able to answer that one)
Take it easy
Sean
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Location:
Wollongong
Registered:
May 2002
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Re: A340E Auto Cressida Transmission & 1JZ-GTE
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Thu, 24 October 2002 03:54
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Sean, are you the Soarer TT driver who features on the Soarer DieHard page with the upgraded A340E gearbox?
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Location:
Adelaide
Registered:
June 2002
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Re: A340E Auto Cressida Transmission & 1JZ-GTE
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Thu, 24 October 2002 04:39
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Soarer-Nah, hate to disappoint you, but I'm actually a toyota crown(1972) driver (fitted with A340). I had a 450 hp 5M in front of it, but have changed to a 4.5 litre 24 valve petrol landcruiser motor with TO4(motor in and running with autronic ECU-turbo manifold under construction)to get a bit more torque. Unsure if the A340 will cope with 650+nm torque-but time will tell....I've had the valve body done-but may change to C4 or powerglide if the motor makes too much torque for the A-340 to handle.
One of these days I do aim to own a car that is younger than I am..
sean
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Location:
Wollongong
Registered:
May 2002
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Re: A340E Auto Cressida Transmission & 1JZ-GTE
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Thu, 24 October 2002 06:44
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Did you get the valve body done at MV Automatics ?
I want to upgrade my A340E soon, just wanted some personal opinions from people who have had the upgrade done.
What is it like for slow city driving (ie, is it like normal) ?
How much of a difference is it when in 'race' mode  ? Time to shift gears etc.
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Location:
Melbourne Vic
Registered:
October 2002
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Location:
Perth
Registered:
September 2002
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Re: A340E Auto Cressida Transmission & 1JZ-GTE
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Thu, 24 October 2002 16:19
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use my old tail shaft with a chaser gearbox.
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the cut should come with about 2 inches of the tailshaft still in the back of the tranny
then a driveshaft place can cut and shunt your original one to the new one
if they are diff that is
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Location:
Adelaide
Registered:
June 2002
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Re: A340E Auto Cressida Transmission & 1JZ-GTE
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Thu, 24 October 2002 23:28
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Soarer-I'll have to get back to you on that as I haven't drven it with the new valve body yet (doing trans mod, fitting turbo, intercooler, front brakes and converting to rack and pinion steering in one go) to be able to give a before and after answer. The main thing about the mod is it gets rid of the slow 1st to second shift, giving a chirp (apparently) on the shift. Your best bet is to give mike at MV a call and ask him directly (don't worry-one of the quality, honest operators in the aftermarket scene who won't tell you crap, sell you something you don't need or tell you something will handle 1000 hp when it'll only handle 300). He could either do your valvebody, or pick one up here in adelaide for you (approx $100) and then do it. From memory the mod is about 300 and the total race box upgrade is around $2400.
I'll keep ya posted though on how it feels when rolling again.
Take it easy
Sean
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Location:
Wollongong
Registered:
May 2002
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Re: A340E Auto Cressida Transmission & 1JZ-GTE
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Fri, 25 October 2002 00:16
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Sweet... I actually called him last week and spoke for about half an hour about the mod. Seems like a nice bloke.
Yeah, $380 for a Stage 2 kit (fitting myself).
Let us know how you go. Will be interesting to see 
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I supported Toymods
Location:
Perth WA
Registered:
May 2002
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Re: A340E Auto Cressida Transmission & 1JZ-GTE
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Sun, 27 October 2002 02:24
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I think you would like it as the transformation is amazing.
I just got my car back from MV, and I went for a more comprehensive kit - big oil cooler, slightly higher stall speed, and shift kit.
I went to test the car and the following is obvious:
1) no more luxury shift - the gears thud as they change
(disconcerting at part throttle)
2) moderate to high throttle = chirping of tyres as it changes up
3) less smooth feeding in of torque = possible loss of traction
when going round corners = possible issues in wet
4) no more "burping" of the engine with upshifting
5) dramatic improvement in 0-100 times
Before: (stalled up) 5.62sec 0-100
After: (not stalled up) 5.6sec
(stalled up) 5.19sec
6) massive traction issues if you overcook the launch
The car is even less of a "sport" car as it is even less predictable if you are going to punt it round a circuit due to the dramas you have if it upshifts mid corner. However it is much more a "drag" car. If you think you want to keep your Soarer as a luxury cruiser, the loss of shift "quality" may annoy you, but I think there are different rates you can uprate line pressure.
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Location:
Melbourne
Registered:
May 2002
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Location:
Wollongong
Registered:
May 2002
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Re: A340E Auto Cressida Transmission & 1JZ-GTE
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Sun, 27 October 2002 04:59
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Thanks for the report jza70-mel.
The only thing I don't seem to like is the thud at slow speeds you mention (and wet weather could be dangerous).
Apart from that, it's exactly what I want.
Variable line pressure would be cool. I'll have to speak to Micheal about it.
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I supported Toymods
Location:
Perth WA
Registered:
May 2002
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Re: A340E Auto Cressida Transmission & 1JZ-GTE
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Fri, 01 November 2002 23:44
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I've figured out a way to soften the "thud". You can accelerate to just before it changes from 1-2, then hop off the gas. The trans will change up without the engine supplying much torque - no thud. (just like driving a manual - off the gas for gear changes!). Once you are going, the 2-3 and 3-4 changes are quite OK (I have'nt gone for "dash-cracker" shifts).
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Location:
Wollongong
Registered:
May 2002
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Re: A340E Auto Cressida Transmission & 1JZ-GTE
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Sat, 02 November 2002 00:41
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Nice !
Looks like I've figured out my Xmas present 
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Location:
Melbourne
Registered:
May 2002
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Re: A340E Auto Cressida Transmission & 1JZ-GTE
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Sat, 02 November 2002 06:39
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jza70-mel, yeah that works for my nova when warm, but when cold and it has no idea what accelleration is, there is the thud
Still... My thud is due to something sinister, yours is not! 
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