You can use a Japanese RWD SR20DE engine on a 89 240SX. I just got one off ebay for my 89 240SX. It did not come with a wiring harness or ecu so I have to track those down. I hope that helps to answer your question.
Doesn't need to be a point to dropping a non-turbo SR20 into a 240. Maybe some of us just don't have the money tree growing in our back yards like others or maybe some of us just like the fact that it is JDM and not a KA24. What's with all the haters????
Hey, it's cool! I guess that I jumped the gun on that one...it just seems like every post with someone asking a simple question has someone with something uneccessary to say. What could seem like a dumb question to someone who has been around cars and engines a long time could be a serious question for someone who hasn't. The advanced tuners shouldn't put down the starters because we all have to start asking questions somewhere about something...hey, what's a manifold, etc. Back to the subject at hand. My engine is a Japanese RWD SR20DE and it cost me $460.00 but that was without the ECU and wiring harness. I can't wait to get it into the car. I know only what I have read about the swap process. I'm gonna stand there and assist the guys that drop the engine in and learn as much as I can about it. We are friends but I don't expect them to charge me any less than they would someone else to do the swap. I have know idea how much it's going to cost me.