i have an s4 na ecu im was wondering i can tune it for boost. the other thing is how much is it tuneable

 

1. No. 2. decent amount.

Why don't you just buy a s4 TII ecu, there literally only $30 if that.

 

Like said above... replace.

And get an Rtek.

 

The engine will run boost with an NA ECU, but it is not optimal. The FAQ on this forum has more information on NA to turbo swaps:
https://www.rx7club.com/forum/showthread.php?t=494667

None of the stock ECU boards are user-tunable unless a piggyback or modified ECU is added. The most common solution an Rtek upgraded chip or Apexi SAFC.
http://www.pocketlogger.com/index.php?pid=rtek7
http://apexi-usa.com/products/?id=5347

You can learn more about the Rtek, SAFC, and other similar products in the sub-forums of our Engine Management Forum:
https://www.rx7club.com/forum/forumd...sprune=-1&f=37