912 + Subaru STi motor +WRX trans project, conversion |
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912 + Subaru STi motor +WRX trans project, conversion |
RonW |
Feb 16 2013, 04:45 PM
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#1
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Member Group: Members Posts: 76 Joined: 31-December 05 From: Alameda, CA Member No.: 5,340 Region Association: Northern California |
Hey guys, I know its not a 914 but hoping to share info and request help on my project since the 912 board is fairly devoid of these conversions.
car is a '68 912 and last year I installed a 2005 STi Spec-C JDM motor and running the stock ecu and stripped down harness. I used an adapter plate and adapter flywheel and stage 2 Sach pp/clutch. for exhaust i used a pair of 2 into 1 header stubs that outback makes and brought each bank up to a turbo flange, then exhausted it to Coast Fabrication muffler. used twin turbosmart EWG with a locked out IWG. on the inlet side, ran it thru the stock MAF thru the turbo to a water/air intercooler and a turbosmart BOV up front im running a ron davis radiator and a fuel safe fuel cell with the mostly bent tubing run under the car just inboard of the pinch seam, similar to how the factory ran the oil cooler lines and short sections of 1.25" hose connecting. with the stock ecu ive have the stock tach sent in to North Hollywood Speedo to modify to take the ecu tach signal and redo the face to 8k redline the rest of the car is set up with 82SC front end and fresh Bilsteins and elephant polybronze bushes all around and lowered ride height. So that was phase one and been running her for the last 4 months or so. drove from SF area to Santa cruz and if i kept the revs at 3k then got 30 mpg but was only doing like 60 mph. if i increased to 75mph then 3400rpm and 24mpg. so i decided to go down this subaru path yet further and scored and 2010 WRX 5 speed that only had 20k miles on it. I am swapping in a reveres ring and pinion and will utilize 930 adapter flanges. Problem: one of many come with this swap for a 901 bodied car. 1) 930 axle wont bolt to the short wheel base trailing arms - solution, take later model LWB and have them modified to SWB dimensions by a shop that has a jig for this very mod. this will then allow for clearance and use with those larger stub axle flanges. plus the bonus of bigger brake options - this should be straight forward 2) transaxle mount - modify stock or subaru mount to bolt to the stock location - again wont know til im there 3) shift rod - hoping to mate the stock shift rod and retain the wevo shifter set up but wont know until i get there. i wish i could cable shift like many here have with an MR2 but no room. THIS IS WHERE I NEED YOUR COLLECTIVE HELP 4) hydraulic slave for clutch - stock is obviously a cable actuated system and i really do not want to try to graft in a Tilton pedal cluster. any recommendations of making this work? ie cable actuation to some type of master to a slave??? any advise would be much appreciated and i hope i'm ok posting my 912 project here. |
RonW |
Jun 9 2013, 03:39 AM
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#2
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Member Group: Members Posts: 76 Joined: 31-December 05 From: Alameda, CA Member No.: 5,340 Region Association: Northern California |
Time to start on the TY758 WRX tranny. Here are a few shots taken during the tear down, pretty simple, lots of case through bolts, only 4 internal bolts, a few love taps and she opened right up :wink: . Btw, the new LSD pictured is a factory JDM unit and will receive the Subarugears reverse ring and pinion and outside will get a 930 to Subaru flange.
(IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770787.1.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770787.2.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770787.3.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770787.4.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770788.5.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770788.6.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770788.7.jpg) Finished up trimming the new nose cone and plugging it up. Ready for assembly. I wanted to compare my spare 4 speed 901 before I gave up on the 901. It nearly identical!!! Overall, Bell hosing face to tip of shift rod housing 73.5 vs 74.0 cm (Porsche to Subaru respectively), bell housing face to flange center 16.5 vs 20 cm (Porsche to Subaru respectively). My only fear is the actual position on the shift rod at 10 o’clock vs 6 but I think I'll have it enter above the shift tunnel and have the shift rod above the tunnel as well and make raised platform for the 915/wevo shift tower sit on. (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770789.8.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770789.9.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770789.10.jpg) (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770789.11.jpg) got a chance to start pulling the bearing off the open diff and install them on the LSD keep the matched bearing/race together. (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770790.12.jpeg) (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770790.13.jpeg) then pull the gears and bearings off the original pinion and install it on the new subarugears pinion (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770790.14.jpeg) (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770790.15.jpeg) bolted the pinion assembly to the case and used the pinion depth tool and with the original 2 shims, nearly perfect. i'll have to get some gear marking compound to check the pattern this week and install the seals/gaskets (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770790.16.jpeg) (IMG:http://www.914world.com/bbs2/uploads_offsite/iwolfe.com-5340-1370770790.17.jpeg) |
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