I found a 88 tII for sale and I plan to put a new engine in it. my question is should I get an 89-91 motor or get an 88 motor? If I get the 89-91 motor will there be alot of modifications needed to install it or does everything match up with the 88?

 

to put in the 89, you would need ECu, engine harness, main harness, radiator.
The easiest swap is to install the 88 front cover on the 89 and use the 88 intake. There are variations of this if you want to install the VDI

 

PS....search works!

 

VDI...he said t2

Here's what to do:

put all the 88 engine stuff on the 89 block...intake, vacuum rail, wiring harness, water pump.housing, OMP/front cover, injectors, AFM, all of it. Keep teh 89-91 style turbo and manifold, flywheel(needed for correct counterweighting of engine). That way7 your existing electronics willrun the new engine just fine, yet youll see a bit of power gain by having the higher comp. rotors in place.

Any other way is a real bitch.

 

My bad!

 

just get the 88. way to much work to swap. and very little gains if any.

 

listen to hypntyz7...if you're going to have to replace the engine anyway, why not put in a little more effort and get a stronger (stock) engine?

i say go for it...i did...

 

It's easier than you think. There isn't much difference between the 88 and series 5 engine wiring harness. The 89 engine will drop right in to your 88. Points of concern include:

the front cover. The S5 engine has the electrical OMP. You have no way to control the S5 OMP with the S4 ECU, so you'll need to swap the front cover from your old engine and use the S4 mechanical OMP.

Throttle Body. Use the S4 TB.

There might be a couple other small differences, but you just use the 88 parts when the S5 stuff doesn't work.

The only other problem will be that the S4 ECU has no idea that you changed the compression and Turbo. This problem can be corrected with an Apexi Super AFC or other fuel computer.

conclusion? Sure the S5 is more work, but you also have a better compression engine and better turbo. I'd do it in a heartbeat. That's probably why I have an S5 NA in my 86.

 

ditch the omp and run premix

 

thanks for the replys any additional info would help alot
I found a site that sells rebuilt engines at a good price, its www.mazdarx7engines.com did anyone hear of or deal with them before.