Hi all,

Have purchased a S2 RX-7, and am planning to install the 13B from S5 front cut.

Am looking for advice from anybody who may have performed a similar transplant.

I believe I need to perform the following mods:
Purchase an exhaust manifold to get turbo to clear stearing
EFI fuel pump
Swirl pot
Low pressure pump to fill the swirl pot
12A front cover
Modified tail shaft
Change sump for 12A item
Relocate/replace intercooler

I am looking to use the standard computer as I will save AU$800/AU$1200 on a Microtek, and want to leave the donk pretty well stock (until it requires a rebuild at which time I'll reconsider)

How does the gearbox cross member mount up? Does the S5 item bolt up, or will the S5 box mount onto the S2 cross member?

Can anybody suggest any (reliable) cheaper alternatives to the above required mods? Have been told I can drill the engine cross member and offset the engine which will allow use of original manifold. Is this OK?

Do I need to buy a new sump, or can I modify the 13B sump to fit the 12A front cover?

Can anybody sell me these items?
Does anybody have an electronic version of the S5 motor manual?

I am also wanting to know where the power antenna relay is supposed to live (ie what plug it belongs to) under the dash.

I am in Brisbane.

Arran Coote
cootea@acenet.net.au

 

I was/am thinking of doing this also, but with a series 4 turbo motor into a GSL-SE (but that car is almost as heavy as a TII). I did some research last week and found this site. Good luck.
http://geocities.com/chris32472/engswap.html
Good luck,
Patrick

 

I'm doing this to my 83, a lot of work is all I can say. Well I guess it depends how you go about it, If your just putting a stock T2 and computer in your car is shoulden't be that hard but I'm going to put a T2 trans also allong with a T04 turbo (possibly). I'm swaping in a complete front crossmember-suspention and rear end from a -se. Also going to go with the haltech from the get go, don't want to deal with all that stock ECU stuff and I want to be able to datalog and tune my car. For the engine you will need a -se oil pan, oil pick up tube and also the front cover so you can mount the engine in your car. You can run the stock n/a trans but you need to get the same year n/a flywheel because of the counterweights (if you have a 87T2 engine you need a flywheel off a 87-88 n/a car). If you decide to go with the T2 trans you need to modify the rear extention housing so the shifter will come up in the right place. Also the trans mount wil be off so you will have to custom make a new one.

 

a cheaper route IMO would be to screw the "swirl pot" unless you have had experience in this. i would just set up a sump setup off the bottom if your looking for a drag car or do what im doing and take the intank stuff from a series4-5 and put it in your series2, not too hard...

the trans mount i am in the process of making one. when the trans is all put in the bolt holes line up about 1.25" back so i am making a offset block, also for shifter location i used a 12a shifter assembly and cut out about 1" of the tube and rewelded it back together and it fits just fine.

 

im actually about to try and start one of these projects myself using an 85 GSL. its got a blown 12a, mint interior, great body shape, and it was 300$.

pardon my ignorance of aussie slang, but wtf is a "swirl pot".

 

Hi Chris,

A swirl pot is little secondary fuel tank. It is usually only a litre or two and is as a tall skinny cylinder. It is filled by a low pressure fuel pump. The high pressure efi pump then is fed from here. This ensures that the efi pump is never without fuel (due to fuel sloshing around a fuel tank)

 

ahh, thanks, makes sense. not fuel starvation in turns, equals no detonation and dead motor.

i was just planning on making a way to drop my walbro 255 into the stock location if that was possible. would i need to run new wire for the larger pump?

thanks

 

most deffinatly

 

I have done this conversion, was quite hard to find the information and most rotor shops dont want to tell u much unless u get them to doit or buy stuff from them. So i made a website describing how to do it. http://geniusracing.8m.com

Any questions send an me an e-mail

 

Arran!!! Amazing, I'm in Brisbane too, and I'm doing the same conversion.
I have 1982 S2 and I have a half cut of an S5 ( FC3S ).
I've found that the chassis rails on on the S2 and the S5 are almost identical, same width and with only minor modification the S5 front cross member will bolt straight on.
With this approach the front cover of the motor can be left alone and if you use the S5 rack steering, the turbo will fit without having to re-locate it.
Also the 4 spot S5 brakes will give it some real stopping power.

 

its good that you are researching things for your upcomeing work, but if you were to look at the date of the last post, you would notice its over 5 or 6 years ago............... to see something more recent check out this thread I have some photos on the front crossmembers swap, as well as the engine transplant.

kenn

https://www.rx7club.com/1st-generation-specific-1979-1985-18/half-way-there-554678/ start around the 2nd page for photos on the crossmemeber swap

 

Thanks for the reply, and yes, I can see that it is an old thread.
But tracking down someone that has done this mod is hard.
I considered putting in the FC dash too.
Did you have to do much cutting to fit the dash?
Also, on the subject of the front cross member, did you shift the bolts that go through the chassis rails? And how did you do it?
Cheers.

A.

 

Sorry kenn_chan, I was a bit premature, I've read all your threads. It looks like a straight forward conversion. I think I'll drill the S5 crossmember.

I can handle the wiring ( Sparky/Instrument fitter ) , chopping the dash is more of a worry for me.