My 3rd Blown R154

[SupraSized]

Well here it is my 3rd blown tranny within two summers. Happened this morning before work. It all started when I replaced my factory clutch 50k original mileage to an ACT 6-puck unsprung and a lighter flywheel. I will of course use a heavier one. Ive been eating through trannys bad. Im no expert with supras yet but I can now change my trannys pretty damn fast now. Can some one chime in their 2 cents on what the hell is going on. I have a feeling its the clutch. I havent at all beat the hell out of the last two because of pricey trannys and high gas prices. I took extra special care of this last one with a lot of rolling starts no gas. So I guess now is the time to do that bottom end rebuild Ive been wanting to do, maybe a T56 tranny, I dont know yet. Lets hear it.

 

[Nick M]

Well, a clutch is supposed to gradually engage engine torque. A superstrong one will give your trans a loading shock if you dump the clutch.

Or learn to disengage the clutch when shifting.

Or maybe quit shifting like a gorilla.

So how exactly is it blown?

 

[IJ.]

T56 won't even be close to fitting without major work.....

What's better to tear up a softer clutch or to destroy trannies?
(ie: is there a reason you "need" an unsprung disc)

 

[MidShipCivic]

Ok if no one is going to ask how much torque he makes I will.

HOW much torque do you make there freight train?

 

[SupraSized]

Ok if no one is going to ask how much torque he makes I will.

HOW much torque do you make there freight train?

A lot less than its rated for. Around 300 ft/lbs. It's apparent I need a more suitable clutch. Any suggestions. Im still running the stock ct26 at 12.5 lbs Oh an when I mean blown I mean grabbing the input shaft and jiggling it around.

 

[BorHor]

The factory clutch can hold up to 400 ft/lbs iirc

 

[MidShipCivic]

Thats weird I made the same or more power than you did and I didnt break anything. Quit killing your trannys.

 

[IJ.]

Solid centre clutch......

 

[upgradedsupra]

690RWTQ and no tranny breakage here

Duane

 

[CFSapper]

I call BS^






















we both know your over 700

 

[disturbed1]

thanks to IJ - i hope i wont be fixing anymore gearboxes in a hurry

 

[upgradedsupra]

I call BS^






















we both know your over 700

Well without slipping clutch yes it would be over 700TQ I would only have to guess that many people are running high mileage transmissions to be breaking them this easy.

Duane

 

[hottscennessey]

I've read that unsprung clutches are hard on trannies, but it was my understanding this was reffering to long term effects. How exactly did it break? (sorry if you posted this, i didn't see it).

 

[drjonez]

(ie: is there a reason you "need" an unsprung disc)

bingo. unsprung disc = blown R154. too much shock for the old dog.

try using redline heavy shockproof oil in it during warmer times....it's worked for me.

 

[mkIIIman089]

What Nick said.

After you dump that clutch.

 

[Syris]

wanna get rid of the blown r154?

 

[7Mboost]

Use good quality gear oil, the more viscous the better.

 

[IJ.]

Which will make the already bad shift quality of the 254 even worse.....

It's a bit of a chicken and egg thing.

 

[Tun_x]

I have never personaly broke a r154 I know people somtimes get a little aggressive with the sawzaw when making themselves a short shifter and make it to short thus when shifting not quite getting it all the way in gear... particularly when trying to shift hard and fast

I run a unsprung clutch with no problems

 

[supradavenz]

suprasized and tun_x what diff's do you run? LSD or Torsen?

Its a long shot but a torsen prolly wouldn't help the problem otherwise im kinda dumb founded with the infomation so far.. R154's are weak trannys blowing one without even trying is a bit weird. unless it was REALLY REALLY badly maintained ie. no oil lol

3 R154's down the sink hole sucks dude