how well built are the auto trannys in my 05 g35 coupe?

[onebadg35]

well what i was wondering was, i was considering putting fi on my g35. im not shelling out the 10k for the twin turbos but was considering a supercharger. does anyone know how much hp a auto transmission can handle or if they even do kits for the autos? please let me no what u think im new to thins thanks.

[joe603]

400 RWHP is the common max for the engine/transmission. I believe the transmission/rear end can handle more than the engine.

[onebadg35]

is this even with it being a auto trans?

[audtatious]

The 5AT has been around for a while and is a pretty stout box. If you FI with it you will want to add a transmission cooler and you will probably want a valve-body mod which will allow more fluid at higher pressure to pass through.

[onebadg35]

im not aware that you could do that to our trannys ? does it make it shift harder or does it improve shifting ? is it costly ? and does anyone know if they make stall converters for this application also?

[audtatious]

GTM has an upgrade service: http://www.gtmotorsports.com/product.ph ... 262&page=1

There are also kits out there as well where you can do your own. Someone did it here but I can't find the thread. I'll keep looking.

Ah, TBW did it...here's the thread: 5at-transgo-valve-body-shift-kit-diy-t479887.html