I was wondering if anyone on here knew for sure if the STI's transmition would be a direct bolt up for my 02 WRX, if not what all id need for it to work. also if the sti's door panels would fit on the wrx. thanks
if u got the $$$ you can fit the STi 6sp. into a WRX, but it isn't a direct bolt-on. You would need to do some mods to make it work...I'm sure someone will go into details, right Mr. Shorten?
when I checked on it before I bought my PPGs the swap was around $4.5-5.5k with all the parts necessary for the install PPGs around $3500, I sell those too...
yep, few other things, but I'm 90% sure that the bolt pattern is that same 8 from the ej20, but you'll probably need a new rear diff, or at least different final drive.
you will need alt of parts 6spd tranny driveshaft (6spd or 4eat) rear diff (r180) wiring DCCD controller Hubs (different spline count?) axles brakes (brembos) 17" wheels ( to clear brakes) or you can use the SVX backing plates and use your stock brakes/wheels. but those are kinda hard to find IIRC. all in all it will be over 4K for parts.
Next question - what about putting a DCCD in a WRX 5-speed? Or even just making more bias go to the rear wheels? I'd love to get mine set up to about 35 front/65 rear. (sorry if I'm stealing topic)
for teh 6spd swap....it's not difficult. It's the rear halfshafts that you want to worry about IF you're going to run the R180. Just find a R160 w/ 3.900FD and you'll be fine unless you're getting the 6spd w/ R180 rear diff with it. Your front axles will fit, but may depend on what year 6spd, I believe they are all still male stubs from the tranny. The center diff on the DCCD cars ARE planetary gearset. You can overspin the rear w/ DCCD on defualt, or OFF. You will NOT mess anything up. The DCCD applies limited slip, with it OFF, the center diff functions just like an open diff, just rear biased because of the planetary gearset; AND it will ALWAYS be 35:65 with all wheels on the ground. With DCCD to LOCK, it will apply FULL limited slip. The REARS will still slip first if they do, BUT there will be ALMOST FULL LOCK or LOCK of the center diff. W/o the DCCD controller, you're not helpless. The DCCD only applies limited slip. w/o it the tranny will still be 35:65 regardless. or like the newer ones 41:69?? You will only be helpless in the snow. Just don't overpower your wheels...no tire slip = traction.
Close, 41/59. You won't be helpless in the snow though. I drive most the time with the center fully open. You just can't mash the gas.
You need: 1. STI transmission 2. 6MT tranny mount 3. driveshaft from an automatic 02+ wrx/rs or the STI 6mt one 4. 3.90 final drive R160 diff 5. someone to help install it
+ shift linkage, clutch and flywheel, and possibly stub axels depending on what car its going into. Crossmembers are all the same. Shift linkage must be on the tranny when installing. I found that out the hard way. To use the R180, you'd also need the rear diff support crossmember. For DCCD control, its really hard to use the factory DCCD computer. It gets a few things from the factory ECU, so you'd need that and keep it happy enough to give the DCCD computer what it needs to function. THere are a couple aftermarket DCCD controllers out there for $150, 400, 800. Keep in mind you cannot dyno the car unless you have a controller to get it at 50/50. ITs not that bad in the snow without the controller. It can actually be kinda fun sometimes An RA gearset is a huge waste of money. Its not any stronger than the factory gearset. Call Andrewtech Automotive, they'll tell you how many broken RA sets they currently have in their shop.
I think it depends on the dyno. Either way, I won't run the risk of making the center diff unhappy due to the wheels not being connected by asfault. Maybe its just me:???:
Every thread I've read says there's no gain or benefit from taking the STi out of auto for a dyno. The rollers are connected and move at the same speed meaning no added stress on the center diff.
I was unaware of that. Maybe I'll get on the dyno sooner than I thought. Aside from the PPG gearset, Subaru beefed up the 5mt a little bit for, I wanna say '06. Slightly larger gears.
how r they connected, cause i know they arnt connected all the time (fwd/rwd), and i know that differant rollers are used from car to car (wheel base).
The STi RA gears are wide, are they not? That's why 03's have wider 1-3rd gear, same width as RA. The strongest 5spd would be the 22B STi. Those gears are shotpeened. That's what I'd do. A lot of gears break from the way it's used. I'll be using STi RA gears for mine, but then I'll be doing road course opposed to frumDig.
Could also bring a gear set down and get them cryo treated. I know some of the rally guys do that and have had good luck with that. Russ
STi RA gears aren't any wider. The gears in the Turbo legacy are also shot peened, but they don't hold up any better. Run what you've got with a gentle left foot and save your pennies for the PPG set. It'll be the last gearset you buy.
Just to clear up a few things: For the 2004-05 STI, the torque split was 35/65 F/R. This was changed in '06 to give a better handling feel, it's now the 41/59 F/R that was mentioned. The transmissions in mid year 2003 WRX's were given wider (RA width, app 1mm wider) gears to help strengthen the transmission. The transmission in the 06 onward Impreza is the same as the turbo Forester (including gear ratios) so it's an entirely different unit altogether. DCCD can not be retrofitted to a 5 speed box. It's not the just the gearset, it's the sensors (steering, yaw, brake, throttle, individual wheel speed, etc.) and those would have to be installed as well. PPG gearsets are amazing. That's all I've got on that subject.
Since we are talking about the 5 speed. I am getting a grind going into fourth if I shift fast. Is that just a syncro taking a dump?
how does the 6spd and a 2.0l engine match up in terms of the power band and such? What are the gains of doing the swap and what are the negatives of doing the swap?
That started happening last year to me as well. As mentioned, try scotty's cocktail. It worked like a charm for me.. no grinding under hard shifts
Not true about the clutch/flywheel, you need to use the WRX EJ20 originals, not the STi parts. Ask 1_sic_rex, that lucky SOB has already had all this work done.
Why yes, I do.... and you have to use the factory clutch. As for the ratio.... i love the six spd gears. I have heard of people hating them but it tight situation, (ei autocross or even down the 1/4 mile), the set up is perfect. As far as overall ratio at 70mph its at 3000 rpm which is what my 02 tranny did. I have also noticed a little more whining noises with the six speed but nothing your factory sound system cant drowned out. You will need pretty much the tranny back.... driveshaft, diff, axels, and front knuckles. all of this makes the swap a direct "bolt in" I got lucky and had the entire donor car sitting next to my car when we did the swap.
