S15 SR+Tranny in S13

tougeattacksid · 01-12-2010, 07:19 PM

well guys. Its my first post on SR20 Forums, ive been on the drift forums and decided it was better to ask on these forums about tech stuff. Sooo I had an S13 SR and was happy until i had a run in with a deer...so...i pulled the S13 SR and sold it to a buddy with an S12 and am now looking to do the S15 SR20DET swap (i just want something that's a bit unique, dont need terrible amounts of power to drift or drive

). I've learned so far that most of the pain is in the wiring and getting the speedometer to read. And since i had HUD before and it never worked, i dont mind myself lacking a speedometer, and i probably could get a GPS or something to take care of that. Anywho, I was wondering, since i dont care about the speedo, in order to get the S15 tranny to work in the S13, do i still need to get the differential housing? (iirc the only reason i have to swap it is because that's where the speed sensor hooks up)

and if anyone knows...is there a length difference between the S15 and S13 SR20 transmissions? and if so, who would i go to to get a driveshaft for this application if im gonna stick with the S13 differential housing?

Any tips on the swap itself?

im definitely gonna take my 255lph fuel pump from my old shell and install it on my car and probably get a new Nismo t-stat with alum radiator and all.

Anyone have any links/suggestions about the pipe coming off of the turbo since its angled rather than straight up like the t25's?

and do the S13 rocker arm stoppers need any modification to be installed on the S15 SR?

Thanks mucho guys!

JJsr20ma · 01-20-2010, 05:41 PM

tranny doesn't swap in to easy your better off sourcing an s13-14 tranny. plus you have to remember 6 gears crammed into that tiny tranny is itching to break so go with a 5 speed. if you looking for a tranny thats goin to hold 500+ hp the get a rb25 transmision

tuned86 · 01-22-2010, 06:10 AM

I haven't completed the speedo mod myself but so far heres is what I've collected to get a speedo signal from a S15 gearbox.

Speedo Casting looks like its there.

Shaft does not have any gears:

But a J160 (Lexus AZ gearbox) manufacturered by Aisin who also build the S15 gearbox has the provisions for an electronic speedo sensor.

It can be done with a bit of machining and will look oem.

tougeattacksid · 11-12-2010, 12:05 PM

wow thats actually pretty sweet!

so as far as the mounting for the trans, would i have to modify the transmission mount? and as far as the driveshaft goes, would i have to look into getting another driveshaft or would it be possible to use the S13 driveshaft if i stick with the S13 differential?

as far as the six speed goes, i might as well use it if im gonna get it right? haha

thanks for the info so far guys!