A340E and HP questions!

[Isphius]

Ok, Ive got my 88 supra, getting a new HG, arp studs, 3 inch exhaust, etc. My main question is, how much will the a340e hold up to, and more importantly, how long? I know the main thing that kills an auto trans is heat and clogged TCs. So I plan on replacing the torque converter, And installing an inline filter and giant B&M trans cooler near the radiator, so it will stay cool but never below operating temperature. Im thinking also keeping OD locked out most of the time will help things, Because a trans going into OD and out all the time generates clutch band heat. Any suggestions here? Also, what rear gear did the stock 88 turbo targa auto come with? It has the sports package and LSD, So does anyone have an idea?

 

[TurboStreetCar]

based on my 1/4 mile ET/MPH im running in the ballpark of 290whp, i have a bone stock 170-XXX mile tranny with only the accumulators shimmed and it runs fine. i also have a small cooler in front of the radiator.

do the accumulator shimming, get a big cooler and a thermostat and you should be good for low 13's. if you get a bigger turbo get a 3kstall for like 450, and rebuild it with IPT's blue friction rebuild kit. from what i hear that makes it last alot longer.

 

[suprarich]

300 hp is a safe number for the stock tranny with cooling help. Heat is not the biggest killer, overpowering your clamping force on the cluch pack, causing them to slip, is the big killer when going over 350 hp on a stock tranny.

 

[TurboStreetCar]

you can never have too much clamping force on the clutchpacks. if anything the more the better. heat in the tranny fluid is the biggest killer aside from enough power to break parts or force the clutches to slip.

tranny fluid at 180 degrees F will last about 2-4 times longer then the same fluid in the same tranny at 212 degrees F, or at least thats waht ive herd.

since tranny fluid is what makes the clutches have alot of friction to eachother you want them bieng bathed in good contition proper temprature fluid.

clamping force is what hold the clutches together. not force them to slip.

 

[jamesdem1123]

yea i dont what kind of power they can hold, all i know is that my a340 was stock, clamped onto a gte with an upgraded turbo, complete 3 inch exhaust and 10 pounds of boost and now 2nd gear doesnt hold on at all, for me to go 50mph requires the engine to stay near 3000 rpms, with OD on!

 

[plaaya69]

^ That sucks but what engine was your a340 originally from? a 7mge or a 7mgte. I just rebuilt mine for my 87 Turbo Supra at a aamco transmission place about 5 months ago and I drove it home and it shifted very nice after that but I only put about 50miles on it so far because I am rebuilding my JDM turbo motor over the winter.

 

[Boss302]

talk to onefstsupra89 i think he's making 500 on stock and it isn't having any probs if i remember right

 

[Nick M]

If you don't do the valve body mod and want to spend some money, this looks like a good place to do it. They do the valve body and strengthen the internals.
http://www.importperformancetrans.com/toyotaauto.shtml

I will be doing it down the road sometime.

 

[jdub]

I've got an IPT built A340E...pretty happy with it.

 

[Boost Lee]

320rwhp/362rwtq, non rebuilt, tons of miles on it, shifts smoothly, been like this for about a year....with tons of abuse (Not BASHING it, just taking advantage of it)

Reason it's been holding up this long is because I got a Tranny cooler RIGHT away when putting this tranny in.

Heat KILLS the transmission.

Anywho, I as well, will be going to IPT to rebuild my A340E. ....
Because I don't think it will withstand the amounts of power I'll be throwing at it soon.

Jeff

 

[jdub]

Heat KILLS the transmission.

Yep! I as well have a tranny cooler with a Spal fan on it running full time.
Also installed a tranny fluid filter

 

[suprarich]

you can never have too much clamping force on the clutchpacks. if anything the more the better. heat in the tranny fluid is the biggest killer aside from enough power to break parts or force the clutches to slip.

tranny fluid at 180 degrees F will last about 2-4 times longer then the same fluid in the same tranny at 212 degrees F, or at least thats waht ive herd.

since tranny fluid is what makes the clutches have alot of friction to eachother you want them bieng bathed in good contition proper temprature fluid.

clamping force is what hold the clutches together. not force them to slip.

I did not say that too much clamping force is the killer. I said over powering your clamping force is. That means too much power from the motor overcoming the holding capacity of the clutch pack (clamp force). :3d_frown:

 

[suprahero]

What tranny cooler do you guys reccommend? I dont think Vonda's is going to last long with that new turbo installed. It has just been rebuilt though, but not with an upgraded kit. Her car has my same setup, and I mad 406rwhp on my car, but it was a fivespeed. I'm not real sure her torque converter can handle it.

 

[jdub]

I'm using a Long's TruCool.

 

[TurboStreetCar]

I did not say that too much clamping force is the killer. I said over powering your clamping force is. That means too much power from the motor overcoming the holding capacity of the clutch pack (clamp force). :3d_frown:

whoops. it looked like by saying "overpowering your clamping force" you ment, having too much clamping force. oh well.

 

[TurboStreetCar]

I've got an IPT built A340E...pretty happy with it.

are you runing a stall? how high?

how do you think a stock unit will hold up using IPT blue friction clutches and a 3krpm stall?

 

[jdub]

3000 rpm stall...the Raybestos clutch plates are a significant upgrade. I had the full mod done to the tranny...converter, friction, valve body, etc. It's holding up very well...barks the tires when it hits 2nd

 

[Isphius]

Whoa, tons of info. That was fast! lol. But yeah, whatever it comes down too, letting the trans get to hot is the easiest way to kill it (besides making more power than the physical parts can actually hold...). Also, like you were saying, clamping force. Older/worn/not taken care of trans fluid clogs up the torque converter, which means the clutch actuators get no pressure, which means they slip, and cause heat, which makes the fluid break down and let everything fall apart. I basically want to eliminate it at the source, the fluid getting hot and the TC getting clogged. Another thing thou, Does the accumulator mod increase the line pressure in the trans? Is that how it makes it shift harder? Or is it just letting the gears engage faster? If so, This would def help the trans last. The harder it shifts, the less its slipping, the less it heats up. Thanks for all the info tho!

 

[toyo4life]

Rear gears on a 88t are 3.91 with auto or stick. 89t went to 3.73

 

[toyo4life]

Does any body else have this problem?
My trans takes forever to shift out of 1st or 2nd when the trans is cold. And when it does its a hard shift. once its been driven like 5-10 minutes it shifts fine.
Should I have the trans flushed? It only has 77,000 on it.