Wrx My2002 Gear Box

BURi · 09-15-2009, 02:11 AM

Hi.
I was wonder how much HP can handle serial WRX MY 2002 gearbox ???
I'm mouting TD05H Big 16G turbo and looking for some details what turbo boost should I set on my ECU to don't blow gearbox ?
BURi

JimmyJ · 09-15-2009, 07:16 AM

300whp max! from what I've read on this forum, but the understand I got is that it also depends on the driver....

LiL Shoaf · 09-15-2009, 05:07 PM

TQ is more the question. Well, TQ and shock loading. There are SEVERAL threads on this so look around and you will see that the 2002 gear box is underrated from the factory and will break at factory power levels with aggressive driving habbits.. Even upgrades like RA gears can be broken easily with mderate power levels under hard driving.. Shock loading is much more important then power levels. If you plan to launch hard and beat the piss out of your car then your transmission is going to break. No power upgrades needed, it's going to break. PERIOD.. If you drive it right it can hold more power then you will have with a 16g. Granted more TQ = greater shock loads. With that said at around 300whp/tq you can pretty much break it at will.

Trust me. I broke mine twice. LOL.

booosted09 · 09-15-2009, 07:57 PM

ouch....

BURi · 09-16-2009, 04:48 AM

Hi. Sounds that I will have to drive not as much hard. We will see if I can ;-)
When my setup will be ready I will let you know.
PS. Do you know any good cheep online store with Subaru Impreza WRX parts ?
Thanks for answering

phatmike0704 · 09-16-2009, 10:32 AM

well i been wit my b16g for a few weeks now and been racin a lil more than thought. cockyness grows with a bigger turbo lol. its been holdin nicely

blk05WRX · 09-16-2009, 11:44 AM

I'm pretty sure the trans. was upgraded in 03 to handle a little bit more power. So I think that's why your 04 has been OK.

turmic · 09-16-2009, 01:35 PM

Can you say....it sheared the teeth right off from TQ. LOL...wow. That's sick. Keep it up phatmike and your trans will send you the check, that or the clutch will take a dump. Mid 03 and later can take some horseplay...just don't abuse it still.

oldfartracer · 09-16-2009, 09:26 PM

300 whp is a safe statement. But, they way you drive will also come into play. I have seen a 500whp car keep the 03 tranny together for a year. I have also seen a stock 02 blow the tranny. The 04 tannies where a little better than the 02-03. If you are looking to due a lot of beating on your tranny, save uo for PPGs.
I would also stick with a stock clutch if you can't upgrade the tranny.

phatmike0704 · 09-17-2009, 08:50 AM

lol true, it is the was u drive it. but like i sed, evr since i got the turbo in, i been wantin to gun a lot. already had the 4th gear grind. trannt fluid fixed it though. im goin PPGs next spring just to be safe if i add more power

Kramericaa · 10-11-2009, 10:18 AM

I'm just about to go stage 2 with my rex and am a little worried about the tranny as well. I also have a heavier clutch which is probably not smart. On the other hand, I don't launch it, race it, or even shift hard. I usually slip it a little under high power. I have had it on for 45000 miles for a stock set up. What you guys think about those full turbo back exhausts on ebay for 250 bucks? Any good?

oldfartracer · 10-11-2009, 12:57 PM

The traany will be in your hands. If you know how to a WRX and know the limits you should be fine. If you don't then start to save your money. The stock clutch is best if you want to keep your stock tranny. I am well past stage 2 and still run the stock clutch and tranny, slipping is what helps save the tranny.
There is a whole tread, SR*S Catback Exhaust from EBAY PICS and VIDS - ClubWRX Forum - Subaru Impreza WRX and STi Community and Forums, about these. They are not bad, but you get what you pay for. They will tend to rust at the welds not fit the best and be loud.

Kramericaa · 10-13-2009, 08:48 AM

Yes definately slip the clutch no matter what kind you have with these feeble transmissions. Maybe I'll slowly save up for RA gears, anyone know how much they are to install, I think you can buy um for around 1700.

BURi · 11-15-2009, 04:29 AM

Guys what about changing gerabox from stock WRX into STI new age ? What is cost for used one ?

Chase · 11-15-2009, 04:52 AM

Expect to pay around $5000 to $6000 said and done. It's more than just the transmission that needs swapped. A great way to go though. I think a dogbox costs about half that though. These prices are with labor I believe, and could be off. They're just what stick out in my head.