Stock Josh

So Im trying to put a 90 FC turbo II in a 72 RX-3. From what I understand it would be easier to get it to fit if I swap on the 12a front cover from my current motor so the motor mounts will line up. Is this correct? And in that case, does that mean I'll have to run the dual distributer setup that my current 12a has?



Am I missing anything else? Im new. Sorry.

Judge Ito

No,no, dont use your original 12A dual dizzy timing cover.. you could use a 79 to 85 12A timing cover then you could use your 90FC crank angle sensor..

Judge Ito

Your going to need a 1985 gsl-se 13B oil pan with the oil pick up.

Stock Josh

OK, Judge. Heres the deal. I was thinking a 90FC motor would be my most intelligent route. I havent purchased the engine as of yet because Im trying to learn as much as possible before I jump in. I dont want to have to back track at all. I have the 72 RX-3. Its all stock and doesnt run. I found it in a field. Scary lookin, but I love it. I wanted to do a turbo motor. My previous car ( that I still have ) is a 90 AWD Eclipse that ran a best of 11.79 @ 119 at 4200 feet. Full weight 3300 lbs.

Id like to produce in the neighbor hood of 400 horse. I thought this is feasible with the FC motor. I was at this mark in the Mitsu, but the less weight and RWD plus 400 horse will net a much better ET.

What is going to be the most cost effective route for me to take? I was originally thinking of a 90FC with a Haltech F10 and locking out the distributor. Then I would mate a 90FC 5 speed ( which Im under the impression will live under roughly 500 horse ) as drivetrain.

Im not a rice boy, and Im not a wishful thinker. Im very serious about this project, but Im having trouble with accurate resources of info. The info is either VERY hard to find, or is just outright wrong. Im just trying to show you that any information you divulge wont be a waste of breath, and would be GREATLY appreciated.



Thank you again.



Josh

LethalRotor

good luck with the swap. if i could get my hands on a 2 or 3 i would build that in a second before doing the 79. can't wait to see it done.

Judge Ito

What you are trying to do has been done a whole bunch of times in the rotary world, with great resutls I might add. How about 8.22 @166mph with a prostreet Rx3 using a 13B turbo haltech set up. This Rx3 Im talking about even had working windows, heater, factory dash. It only had a back half. anyway you could do it. I would suggest using the E6K haltech instead of the F-10. I like timing advance in a street car and if you lock a distridutor to allow no timing advance, yes it's great for high boost and preventing timing failures but sucks for low rpm driving around corners. The E6k allows you to have timing advance under vacuum and a timing lock under boost. If you get a 90 turbo II engine and tranny 400 rwhp is not a problem considering you would supply the engine with the proper injectors and fuel delivery. The 90 tranny would take the 400 rwhp with no problem. considering your Rx3 is ligther then the FC that is a plus for the tranny.



ask away I'll keep trying to help you.

Stock Josh

Question. Why is it you recommend NOT using the dual distibutor setup? Is this because of the E6K? Would I not have an issue if I decide to use the F10? Im trying to see why this is a bad idea. Thanks.



Josh

Judge Ito

the dual distributor timing cover will not bolt on to the 90 turbo II block or any engine besides the original 72 Rx3 12A. The dual distributor uses platinum points which is obsolete.

RX-2

Get a cataloge from Racing Beat. They have the oil pan and front motor mount you will need to put a 13B in that chassis. The oil pan is the stock oil pan for an 85 GSL SE RX7. Or you can make your own if you have an oil pan for a 13B that uses the front mount (RX4, Cosmo, Rotary Pickup) You have to cut the pan off the rail for the pan bolts, then turn the pan around backwards and weld it back on. The front mount can be modified as well. You have to modify the mount to allow the motor to sit farther forward enough to make the diff in engine size. Been a long time but I think it's 3/4 inch. The stock mount is not really big enough to change the hole position that much so you have to add some metal to make it stronger when you lengthen the holes. This is how I did my '73 RX 2 back in '87. Next problem you will run into is the clutch. Your RX 3 has the clutch slave under the car by the tranny. On 74 and newer motors this was moved up top and I think the starter was moved under the car. Your driveline tunnel is fairly small and moving the clutch slave up top will hit the firewall. You will have to make the room. Hope this helps.



By the way... nice find. I have seen the pics. Good luck on the buildup.

Stock Josh

Thank you very much for the help. I am new to the rotary world, so any info helps tremendously. I appreciate it.



Josh