I have a 90 rx7 turbo and wanted to know if you have to have that specific cpu or could i use a non-turbo or s4 cpu

 

Also if it is the case that i have to have the specific one who sells them because i cant afford to pay an arm and a leg at the mazda dealer nor can i find any turbos in salvage yards in my area

 

Mazdatrix sells them new.

Scroll about halfway down.
http://www.mazdatrix.com/86-92Electrical-Chassis.htm

People get rid of their CPU's from time to time in the For Sale section.

I got a used S5 Turbo CPU from Ebay for like $15. No problems (yet). I still have my old CPU, though I doubt you want that one. I took it apart and found a blown resistor on the main board. I've been to lazy to fix it, and I'm not sure if that's the only problem. The only things that didn't work with my old one was the alarm, and key reminder and light.

 

sorry read wrong lol

 

If you have a S5 coupe, you need to stick to using a S5 coupe CPU. The Turbo and Non turbo S5 coupes use the same CPU.

But there are 2 or 3 boards in the CPU (depending on model and series). Only replace the board that you are having trouble with.

 

so a S5 coupe non turbo (GXL) cpu will work

 

took it apart the flasher board is bad thanks fo the info