I was browsing around GM Powertrain website looking for info on the 2.4 and it's tranny. It seems that anyone who builds up the engine more than just bolt-ons will have no choice but to beef up the tranny to keep it from failing under the extra power.

Not surprising, GM did this to us with the Cavy Z24, Sunfire GT as well.

The tranny from the SS/SC is already beefed up accoring to the specs.

 

At what point (hp) are they advising we modify the trans?

 

Here's the spec sheet for the manual. It has been years since I've been involved in this but if I remember correctly, the gearbox torque is the maximum we can put to it.

http://media.gm.com/us/powertrain/en...M86%20MG3).pdf

 

By the way, I'm hoping I'm wrong with this info. Please somebody prove that I am.

 

Are those ratings at the flywheel or at the wheels?

 

I hope that is an under rating, because if not it's already maxed out on the 2.4L

 

yea that would be gay

 

can't see the spec sheet my computer keeps screwing up

 

We are right at the limit for the power rating of the getrag trans. Now almost everything GM makes under goes very rigorous durability tests for a few hundred thosand miles.

Increased power won't kill a Getrag---at least not right away.

 

Should be at the flywheel. So basically the 2.4L has it maxed out.

 

ugh so no s/c fpor the 2.4?

 

Well it will last awhile for sure. But it will shorten the lifespan. Don't expect 100,000 miles. Just don't powershift it!!

This is nothihng new for GM. The Borg-Warner T-5 was maxed out at 305lbs-ft. And the 305 TPI made up to 300lbs-ft. Also GM had an over the counter SLP package (headers, exhaust CAI, chip)--and it was warranited.

 

I would really hope a getrag would be better than that... those are supposed to be some of the best american trannys.

 

Except they aren't American German actually

 

Also nice to know that the automatic can take some more power.... so much for you "auto is for pussies" boys.... heheheh....

325 lb-ft baby!

 

auto is for pus... oh **** never mind. Anyway, just to let you guys know I got my car on the track tonight and I took an SS.SC out there also... Wooooow my clutch is really giving up... The SS/SC, actually both of them I took out, were at 2k miles mine was at 5600. Dood I can't even feel my clutch in comparison. Am I missing someting or do I just need to buy a new clutch and buy a second car ?

 

so us good old auto boys can handle a turbo or supercharger?

 

ill be getting a turbo either way

 

Umm, Automatics Don't have a Flywheel...

 

Anyone who plans to "Boost" an automatic should really invest in an ATX Cooler and a ATX Tamp sensor from Autometer..

Also, it will work well for some time, but it will fail much sooner than if the engine was stock.

Save up for a tranny..

 

I dunno about ALL the ecotec autos, but the maps on my 2.2 Alero will actually reduce line pressure and have abuse maps for the transmission if the fluid temp gets too hot.

So the computer will help you from killing it as well.

The stock trannie should have a temp sensor probably just requires a gauge to display it.

Also keeping the trannie cooler with an ATX cooler will avoid you from hitting the abuse mode in the computer

 

You can just install a line tap on the Cooler input line and add a $100.00 Autometer ATX Temp..

The Sesnor is included and then you don't have to mess around with any of the stock wiring..

 

I have trouble with that number. Maximum gear box torque? What does that mean?

Look at GMs new 6 speed FWD trans. They must be quoting maximum engine torque...because they are rated at 280lbs-ft and a slightly different version is rated at 300lbs-ft. It quotes thta numbers in all the press releases and not gearbox torque--perhaps because it is a largely irrelevant number...........?

http://www.cheersandgears.com/forums...showtopic=7495

A newer trans by at least 10 years s not as strong? Doesn't make sense.


Heres a link to GMs 4 speed 4T-64E. Now if the 4T45 is so strong...why not use that behind the 323lbs-ft of the Impalas LS4 V8. Because its not.

http://media.gm.com:8221/us/powertra...20PWT_4T65.pdf

 

Then what exactly is your starter rotating when it's engaged?

 

I love my auto, how much do auto coolers cost to buy and install?