I have a 2.4L SS Auto.

Ive never really looked into our trannys, but was curious as to all you can do with them. if anybody knows, id appreciate it.

 

B&M shiftplus or AutoTrans Interceptor

 

And thats pretty much all you can do ^^^^^

 

A few things depending on what you want to get in to. To extend the life of the transaxle you could add an additional cooler, especially useful if you plan on upgrading to a turbocharger or supercharger, or even nitrous. Ppazz1101 has a great write up on ecotecforums.com on installing one.

If you have access to HPTuners you could also change shift properties such as required MPH and TPS for upshift and downshifts as well as shift pressures. Great way to get tire barking 1->2 shifts. Ppazz1101 dropped half a second off his quarter mile with transmission tuning alone.

Attachment 1258

Good luck with whatever you choose.

 

i though you could convert them to the big built up drag racing tranny's using gmpp.

and to the shiftplus and interceptor...

your telling me to use hptuners. lol..

 

A few companies will build you a custom high stall converter. As far as making the rest of it bulletproof, I think you wanna ask Halfcent, he had his rebuilt not too long ago I believe.

HPTuners will give you superior control over line/shift pressures and shift speeds compared to splicing in an electronic shift editor.

 

Will HPTuners work on the trannies for the 2.2L seeing as their the same as the 2.4s?

 

Good question. Not sure if anyone is willing to burn the credits to find out though.

 

You can...

1. Get a high stall torque converter. Nice for brake starting and turbo applications
2. Get a LSD from Engineered Performance.
3. Get a high output fluid pump.
4. Get it tuned. Yes, HP Tuners will work on all 4T45E transmissions. And since you have the 2.4, you can tune your engine too.
5. Put a fluid cooler on it.

Now, the only thing in that list that will be of any good to you on a stock engine is the tuning. You could adjust your shift points and pressures to help out a bit. Unless you are pulling out your trans and rebuilding it, a lot of that other stuff isn't necessary.

 

thread revival
is there anything else you can do to your transmission to improve performance or to make it more durable for high HP situations

 

I have a tune for the 2.4L auto that will take that car and snap your head back. I recommend a transmission cooler with the tune, as well as a swap to the 34# injectors.

PM me if you are interested. If you have any questions about its performance, I tuned SSFamilywagon car, and it is a totally new animal!

I have unlimited cobalt credits, so I will look into it, and have been wondering myself.

 

Check out what this guy did. http://groomlakelabs.com/index.php?q...&g2_itemId=824

 

Wow, memory lane.

Thats all the stuff I got.

 

i believe you can also adjust the pc solenoid to apply more pressure upon shifting, for a firmer shift.

 

what temperature do you guys think is safe on the auto tranny, i have a gauge for it but i have no idea what is dangerous, its gotten up to 180 degrees

also, can someone put a link to the 4t45 tranny limitations?

 

http://media.gm.com/us/powertrain/en...45%20(MN5).pdf

That data has been shown to be a bit inaccurate. For instance, the shift patterns shown don't match the Cobalt. The engine input torque is different on some different sheets. Normal operating temperatures in a transmission parallel coolant temperature as a rule of thumb. Perhaps slightly cooler. The trans fluid cooler in the cobalt uses the same radiator as the coolant, so they will be maintained at the same temperature under normal loads.

 

whats the difference between maximum engine torque and maximum gearbox torque? like if i was to get 250 wheel torque and i within range of safety?

 

im not sure if anyone answered this...

and what benefit does a high stall tq converter have? (other than brake launching or w/e its called) How will it improve the durability or lifespan of the tranny?

 

See post #9

 

so other than those listed, theres noything else you can do?

again, how does it help?

as above...how would this help?

 

Okay, a high stall torque converter does some very specific things, and doesn't do some other things. First, it doesn't effect the durability of your trans at all. It will mess with your stock TCM tune a little bit (funky shift patterns), but not much really. What is does do is allow your engine to spool up to a higher RPM before the trans has to turn the wheels. This allows you to get the engine up into the power band faster, and hence deliver more power to the transmission sooner. This equates to faster acceleration. Coupled with some good drag tires, and you get much more powerful launches, as long as you get traction.

A high output fluid pump will give you faster shifts. While this is a function of the electronic controls, the trans can only shift as fast as the pressure in the line can make it. On non-electrically controlled transmissions, this was the common method of improving shift speeds. On this trans, the controller will call for a fast shift, and the trans will shift only as fast as the pump can put out fluid.

Don't misunderstand. Both of these modifications need supporting mods to take full advantage of. The converter needs a trans cooler and tires that will actually hook. The upgraded pump needs to have the controller flashed for faster shifts. No one item makes the difference.

 

i thought you had your transmission built up for like 300-400TQ though....if these dont improve the max power allowed or durability of the tranny, what did you do that DOES do this?

hanks for answering my questions though...it helped a lot, and probably ruled out a high stall tq converter for me since i dont have slicks or go to the track anyways

 

Because I didn't get JUST those things. I got a full package, including hardened internal shafts and gear sets, Raybestos "Blue Plate Special" clutch packs, LSD, Torrington Bearings, the works! Once the turbo is installed, I will then install the additional fluid cooler, which is the key part. I don't need it yet, and I didn't want to have to move it around to install the charge piping. The key is keeping the trans fluid temp under control.

Probably the weakest part of my trans is the actual case. Most failures occur around the differential when the case cracks.

 

is there a way to harden the case?

 

Nope. Well, not that I know of. Once you get past where I'm at, you probably want to upgrade to a 4t60 anyway.