Trying to find how much power will at hold b4 letting go?

 

I have been wondering that since I have got my 06 coupe a few months ago. After doing alot of research on the forums, I would say there is no absolute number at which it will go. Some have gone with forced induction and been alright stock, and some have blown theres with no power adders. There are just too many different factors. I am already planning on upgrading mine. Course I bought my car used and the transmission has been acting up since day one for me. I know this doesn't really help, but just don’t be surprised by all the different answers you will get.

 

There haven't really been that many blown auto trannys from what I've read. Mine held up fine for almost a year, then I did a VB upgrade and SPG screwed up the upgrade at first and my tranny was messed up for a while and it actually caused damage. They fixed it though when I got around to sending them back the VB. Anything above 340wtq you will want to do at least a VB upgrade. In 400whp+ you will probably want to build it with clutch packs.

 

Thx. for info. Hoping it will hold atleast mid 3's to the wheel.

 

I had just over 400 and it started to slip ever so slightly, I had the VB and TC done first and then did the whole tranny upgrade.

Search in the FI section as this has been discussed many times before.

 

400 whp seems to be about the limit.

Any FI will put more stress on it and you will probably need to build it up at some point.

 

Every transmission is rated for input shaft rpm and maximum torque [333 lb/ft for 5AT] since HP is a mathematical manipulation of torque.

 

Bingo. Torque rating is what you guys need to be concerned with, not HP. If you're looking to strengthen your auto and a shop says they can make the tranny hold X number of HP, then walk away because they don't have a clue. What's the difference? How the power is delivered. You can have a 500whp/500wtq motor or a high rev 500whp/300wtq motor. Big difference. You need to know torque rating, not HP.

The 5AT can supposedly handle up to 333lb/ft, but that's it total limit. You want to upgrade the unit to handle at least 20% to 30% torque than you plan on adding. The most important things to improve are the clutches. Consider sourcing OEM clutches from the truck Jatco 5ATs (same tranny, beefier moving parts). I wouldn't pay too much attention to the valve body other than maybe getting a Transgo shift kit which will speed the shifts and take some heat away from the clutches. Make sure your tranny has enough cooling capacity as well. I don't know the specs on the OEM tranny cooler, but I doubt it's up to the capability of handling the extra power. Don't go overboard though. Bigger is not better. Finally, change your fluid often if you're adding more power or driving hard. I'd say empty the tranny (3.1-3.5QTs) every 15K miles or so. Heat is what kills most autos. Keeping the fluid clean and fresh is key.

 

Thanks for the info. I learned something new today and will definetly use this advice.

 

I agree with most of this, except I'd recommend the largest low pressure drop bar and plate trans cooler you can find (mine is 12" x 11" x 1.5" and only just sufficient to keep temps within operating range). There is very little difference in warm up time (so far, in the summer). Of course, if you're not trying to push 500 wtq through the 5AT, you may not need this but the only way to be certain is to measure the fluid temp. The low pressure drop feature of these coolers helps to ensure adequate warm up and mitigates over-cooling.