[N54_KC]

Im pretty new when it comes to the N54 engine and so far have done all the nessasary maintenance and upgrades on my E90 335i myself, nothing crazy just small things like MHD stage 1 tune, chargepipe with BOV, and DCI. I know the stock auto trans only handles around 500whp (correct me if im wrong) and would like to know if there is anything i can do to strengthen my auto trans to handle the ultimate goal i have for my car which is 700whp any suggestions on what to do? I also dont want to swap out for a manual trans im happy with my auto, any suggestions? *side note: i do have 125k miles on the car

[Jeef]

you can look into swapping in PD clutches

[Torgus]

Getting a DCT is probably the best option if you want to remain auto.

xHP transmission software will help as well which you might as get now to extend tranny life.

Ultimately the auto box is going to be your limit specifically the input shaft.

Read this: https://www.e90post.com/forums/showthread.php?t=1705688

Also google: "Guru Autowerks - ZF 6HP26/28 Transmission Adapter"

[NoGuru]

I agree with Torgus, a DCT is what you want.
700whp is very ambitious. So you are going single turbo, massive fuel upgrades?

[N54_KC]

Replying to NoGuru yes I do plan going single turbo with an upgraded fuel system but I am in no rush to get to 700whp but would like to have all the answers and solutions to things I will hace to face down the line only thing is that from which bmw i should get the DCT that will fit my e90

[NoGuru]

Originally Posted by N54_KC

Replying to NoGuru yes I do plan going single turbo with an upgraded fuel system but I am in no rush to get to 700whp but would like to have all the answers and solutions to things I will hace to face down the line only thing is that from which bmw i should get the DCT that will fit my e90

You don't have to get it from any specific model, any DCT will work but the E9X+ M cars and 335is came with a DCT. I think BMW stopped used the DCT a year or two ago and now use the ZF8 trans so that might be another option but I have no idea how much power they will hold.

If you look up 0 to 6 on YouTube the Aussie guy just did this same swap a few weeks back. It's a little technical but with some patience I don't think it will be too bad.

[N54_KC]

Originally Posted by NoGuru

You don't have to get it from any specific model, any DCT will work but the E9X+ M cars and 335is came with a DCT. I think BMW stopped used the DCT a year or two ago and now use the ZF8 trans so that might be another option but I have no idea how much power they will hold.

If you look up 0 to 6 on YouTube the Aussie guy just did this same swap a few weeks back. It's a little technical but with some patience I don't think it will be too bad.

Ok sounds good to me, thanks