I have an 87 TII with a race beat catback and HKS air intake...and a blown engine. Rather than putting it back together in stock form, I would like to squeeze out some more power. Given this, I was wondering what the implications of using an engine from an 89-90 TII would be. Keep in mind that I would probably be keeping the stock '87 turbo. Anyone see any problems with this? Being that the car already has a catback and air intake, I was also thinking that I should consider richening up the mixture (I fear that running lean is what caused the motor to blow in the first place). For this, I've been looking at the Apex'i Super AFC...looks like it should be able to do the job. Any help or advice would be appreciated.

 

BUMP

I could really use some advice on this.

 

the 89-91 motors are not that different from the 86-88's. if you want anything from the 89-91's it would be the turbo and engine control system

mike

 

Anyone else have any ideas?

 

I am in the same boat as you!
I blew my engine (2nd. one) due to maxing my injectors out with a S-AFC. I have 720's in the secondaries and raised the duty cycle too high on them. I was running 14 PSI when it popped.
I have decided to either put another Series 4 J-spec in there, because of the lower compression rotors, or rebuild my old one with porting and better apex seals. I am also going to add a Haltech.
The Series 5 ECU has a few more lines of code in it that control the fuel curve somewhat. If you really want to take control of your engine, you need a EMS.
If you have an aftermarket turbo, the series 4 engines respond to it better because of the lower compression.
You can easily modify them to be as good as the series 5 engines.

 

1) No upgrade fuel pump and fuel pump rewire probably caused the lean condition or you weren't using an FCD?

2) The 1989-1991 Kouki turbo is a much more superior design - if you can get this turbo, USE IT!

3) One of the major "problems" running the later engine in your car is the electric oil metering pump.&nbsp Either you swap the front cover or run the later Kouki electronics...




-Ted