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Old 10-08-2011, 02:36 AM   #1
RonW
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1968 Porsche 912
STi v8 Spec-C conversion

Default '68 Porsche 912 conversion - 2005 STi EJ20T

Ok, so I'll post up my transplant project. goal is to mate it to the 901 for now and be gentle with 1st...we'll see how long that lasts. i want to run as much of this motor in stock form but due to fitment issues, some things will have to be changed, namely exhaust hanging too low and oil pain also too low. header will be a 4-2-1 equal length and place the turbo in front or near the crank pulley. i'd really like to just keep the intake manifold just the way it is so i don't have to redo the stock wiring harness. i'll be running the stock ecu as well so it can handle the AVCS

Wali at JDMRacing set me up with this lovely beast, a 2005 STi EJ20T ver 8 spec-c motor.





got an adapter plate to mate it to 901/915's from Outfront





the harness on the motor is complete but i will have to source a few connector ends to make a connecting harness from motor harness to the ecu. also will need the connectors that plug to the ecu. if anyone has any ideas, i'd be much obliged.





parting shot with the ps and ac gone

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Last edited by RonW; 11-13-2013 at 10:47 AM.
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Old 10-08-2011, 09:32 AM   #2
Vlad
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I have the V9 Spec C, from Wali. Congrats, nice engine.

Get the killerb oil pickup, to protect your investment. The part number of your pickup is the same as the USDM Sti that is known to have problems.

Mine was ok when I replaced it, but now I can forget about it.

Also, this engine calls for an oil radiator. When you install it, the oil temperature becomes more stable and I the oil pressure seemed to climb 1 notch.
Take a look at the EJ207 owners thread, there's a lot of good info about maintenance, etc.

If you're doing a bigger turbo, I suggest the FP oil line kit, it's well put together.

This engine comes with tables in the ECU for automatic intercooler sprayer. Also boost per gear and temperature. You can ajust the gear thresholds, for your application. I changed them from OEM 6 speed JDM to my USDM 5 speed and it reads correctly.
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Old 10-08-2011, 05:05 PM   #3
RonW
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STi v8 Spec-C conversion

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vlad, thanks for the info, will definitely look into that.

well, hit the pick and pulls and the like this AM but no luck on harness/ecu ends i'll have to see if someone has a full chassis harness but i sure hate to cut one up since the full thing is kinda pricey.

anyway, bolted it to the tranny and man, looks like is was born there



time to start figuring out how I'm gonna mount it but i think I'm gonna use the stock motor mounts and tranny side of the motor and weld a bracket at the chassis
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Old 10-11-2011, 01:50 AM   #4
WR Boxer
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Looks great man! Can't wait to see the progress
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Old 10-11-2011, 11:14 AM   #5
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awesome project!
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Old 10-12-2011, 03:59 PM   #6
Vdubtype1
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Amazing project. I am doing a ej207 swap to a VW bug
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Old 10-12-2011, 06:07 PM   #7
RonW
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thanks guys. ive got an EL header to cut up and twins scroll flange to weld to it to relocate the turbo, a down pipe to cut up with a jdm twin scroll flange to convert it, chassis wiring plugs to connect to the engine wiring harness as well as a MAF plug and the 5 ecu plugs on the way. I started fab work on the motor mount to use the stock location with N Gruppe mounts but am still debating on best methods. i'll post up some preliminary shots later tonight. with all the parts coming in, this should keep me busy for a while.

oh, i found a tuner here in the bay area that has experience with JDM ecu's and spec c motors, anyone have experience with Ed at http://www.eqtuning.com/ in Fairfax? spoke to him and he uses open tune load the tune. I've got a fair bit of background with tuning w megasquirt (ms3/ms3x full sequential fuel and spark using tunerstudio VELive) but am not familiar with tuners around here.
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Old 10-12-2011, 06:09 PM   #8
RonW
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Quote:
Originally Posted by Vdubtype1 View Post
Amazing project. I am doing a ej207 swap to a VW bug
nice, you using the suby transmission with the subarugears.com ring and pinion and conversion to 2wd? id live to try that some day. post a link to your build thread!
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Old 10-12-2011, 07:30 PM   #9
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Yes I'm using the Subarugears kit. I had nothing but problems with type 1 trans and porsche boxes are expensive. I am using the 5mt shortened.

I know most of you had problems with the 5mt but I will just be powering 2 wheels. Wheel spin will be my problem

It will be a autocross car.

I will post pictures shortly. New to this forum.
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Old 10-12-2011, 08:10 PM   #10
WR Boxer
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I just noticed, is this really an EJ207? '05 STi's had the EJ257...
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Old 10-12-2011, 08:57 PM   #11
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Quote:
Originally Posted by WR Boxer View Post
I just noticed, is this really an EJ207? '05 STi's had the EJ257...
in japan they are the ej207 and it's a spec-c so not a 257.

Sweet build! I really want to see how this turns out.
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Old 10-12-2011, 10:38 PM   #12
Vdubtype1
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Quote:
Originally Posted by RonW

nice, you using the suby transmission with the subarugears.com ring and pinion and conversion to 2wd? id live to try that some day. post a link to your build thread!
I don't have a build thread
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Old 10-14-2011, 07:30 PM   #13
RonW
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Quote:
Originally Posted by Vdubtype1 View Post
I don't have a build thread
well...start one
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Old 10-14-2011, 08:01 PM   #14
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Ed@EQ is a very good tuner. He's well known around these parts. I would have the utmost confidence in his abilities.
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Old 10-20-2011, 04:17 AM   #15
RonW
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well, away for the weekend to laguna seca and crewing for my friend so no progress but here's a vid

http://www.youtube.com/watch?v=gJluUYo_Mgo


i did start diving in to the wiring. started with nearly full harness with the fuse block cut out. pulling everything i don't need

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Old 10-20-2011, 12:27 PM   #16
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Any shots of the car please? Love the build and the idea. I assume this will only be a rear wheel drive, right?
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Old 10-20-2011, 12:55 PM   #17
RonW
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Yep, rear wheel drive. Here are a few shots taken last year for a book on early porsche hot rods





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Old 10-20-2011, 01:06 PM   #18
NITROS
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How does the clutch hook up with that adapter plate?
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Old 10-20-2011, 01:11 PM   #19
RonW
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plan is to use an adapter to go between motor and stock porsche 215mm flywheel so stock parts can be used. there is however an conversion flywheel but the adapter would be better i think.
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Old 10-20-2011, 04:24 PM   #20
Vlad
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where would the radiator be, with the porsche being OEM aircooled?
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Old 10-20-2011, 04:58 PM   #21
RonW
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twin custom radiators behind each head light similar to how a boxer or 996 is set up. wish i could run those radiators but i dont have that much space up there. cooling lines will be run thru the side heating ducts (if you know 911's you'll know what i am referencing) on one side over the front wheel arches to one rad then out to the other side to the other rad then back via the other side heating duct to the motor. should be pretty clean and no cutting required!
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Old 10-20-2011, 06:43 PM   #22
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I had heating tubes in a Citroen air cooled boxer engine, I know how they work.
Nice project, lightweight too.

Last edited by Vlad; 10-20-2011 at 07:02 PM.
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Old 10-20-2011, 11:46 PM   #23
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What size of radiators are you using? And what size of tube going up front? I have done a similar set up in a type 1 bug. Using two gsxr 1000 rads in front fenders. Directing air from the small lower ports in bottom of fender and from directing air from underneath. So far no problems I live in Canada so I do have a colder climate. The stock sit rad is fairly large. I had doubts on my set up. I will try posting pictures.
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Old 10-21-2011, 01:13 AM   #24
RonW
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Quote:
Originally Posted by Vdubtype1 View Post
What size of radiators are you using? And what size of tube going up front? I have done a similar set up in a type 1 bug. Using two gsxr 1000 rads in front fenders. Directing air from the small lower ports in bottom of fender and from directing air from underneath. So far no problems I live in Canada so I do have a colder climate. The stock sit rad is fairly large. I had doubts on my set up. I will try posting pictures.
i have not gotten that far yet. i live in northern california and it will see track use and spirited driving so I'm gonna try to put as big a rad as i can it in there! love to see pics!
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Old 10-22-2011, 12:02 AM   #25
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Maybe use aluminum pipe to go up front to dissipate the heat going to the rads. I used stainless and used a fairly small tube for less coolant. For less weight. Let me know how tour project turns out
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