[danduccie92]

Hi all just curious to see what the power thresh hold is on the automatic transmission. I would like to crank out a little more power on the car but just want to know at what point im entering the danger zone. Thanks for the help

[Dark_Knight_335]

Well, that depends.

Year and model specifically.

I personally would guesstimate you would have to be putting nearly 500 to the wheels to be even remotely concerned...

[blackturbo]

400 hp wakes the car up. Seems to be a happy medium and safe

[danduccie92]

my car is a full bolt on 2007 i think making somrhwrr around 400hp

[Boland01]

Ours has a JB4, catless downpipes, CRX 12" intercooler and DCI intakes. I'm guessing it puts out in the low 400 hp range. Lot's of fun too.

[danduccie92]

Yea same stuff I have but I have the 7" intercooler and it's a blast

[Fundguy1]

I've heard over 550 rwhp rwtq you're playing with fire. And feeback? I'm manual transmission so it's a curiosity.

[danduccie92]

Wow that's serious power not looking to go anywhere near that lol

[Fundguy1]

I'm overy that by almost 150.

[N0Chill 335i]

My mechanic and tuner said 550TQ+ is where the issues start. Especially if you have an older model car.

[Underground6t9]

I love all these guesstimates with no real hard evidence. I can too play that game and make up some numbers.

[Dark_Knight_335]

Well I don't see anyone chiming in with hard facts.

It's a fucking Tootsie Pop commercial.

Let's go ask Mr. Owl...

[danduccie92]

^^^LOL!!

[feuer]

It depends how the vehicle is used. Even stock level power is more than capable to destroy the transmission.

[Two Snails]

Anything over 500wtq and you're playing with fire.

[hassmaschine]

it's actually simple - the transmission is rated for a certain amount of torque (if it's a ZF, it's usually in the part # and is in NM). Anything above the rated value will shorten the life of the transmission, but not necessarily break it.

You could probably estimate how much life you'll take off with a given amount of torque input (HP is meaningless here), but really, unless you're double the stock torque you'll probably be bored and off to the next big thing before it makes a difference.

[csu87]

Many guys have ran up to and around 550wtq with no issue. However, you need to make sure you are maintaining it meticulously and you are starting with a healthy tranny. If not, youll be looking for a new one soon. HP wise, you can go higher, as long as you keep torque low.

500-550 wtq has been the accepted limits for awhile now.

[natedog7700]

Your driving a 07 335i Auto (same as me) and my first trans started to slip around 500+whp/wtq so i put in a newer stock auto trans. Lasted a couple thousand miles at 525whp and started to slip again past 500. dialed it back to 470 ish and its been good ever since.

These guys claiming 600+whp on stock auto trans are full of crap IMHO. They might get a dyno pull but as soon as you actually do some street runs/races back to back, it will NOT hold up. No point if its not reliable right? Who wants to keep throwing tranmission's in? 500whp is the absolute limit if you want it to last longer than a couple thousand miles. Period.

[natedog7700]

Originally Posted by Two Snails

Anything over 500wtq and you're playing with fire.

+1000

Im surprised at how many people on here actually know the true limit. On N54tech they all believe 650wtq/whp is do able/safe LOL

[danduccie92]

thanks for all of the input

[natedog7700]

Originally Posted by hassmaschine

it's actually simple - the transmission is rated for a certain amount of torque (if it's a ZF, it's usually in the part # and is in NM). Anything above the rated value will shorten the life of the transmission, but not necessarily break it.

You could probably estimate how much life you'll take off with a given amount of torque input (HP is meaningless here), but really, unless you're double the stock torque you'll probably be bored and off to the next big thing before it makes a difference.

These transmission's are known for slipping. They hardly EVER "break" or have an actual mechanical failure.

[csu87]

Originally Posted by natedog7700

+1000

Im surprised at how many people on here actually know the true limit. On N54tech they all believe 650wtq/whp is do able/safe LOL

id trust the info i get on n54ech over what is posted on here usually. but 650wtq has never been a good level for stock trans. Cant be anyone with any real knowledge posting that.