When your doing a motor swap i know you need to change wire harnesses.....but is there anyway you can use a 99 ex ecu..........bc the si an the ex has the same ecu.....is it possible

 

You can use the same wiring harness, but you have to use a different ECU. The SI and EX ecu's are different

Edit: Maybe I'm confused on your question. Which harness are you talking about? The engine harness or the ECU portion? Is your car obd2a or obd2b? But as for the ecu's, the car will start and run on the ex ecu, but the fuel mapping and everything will be different than the SI ecu. Some one please correct me if I'm wrong.

 

they have the same ecu??

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by bleh &raquo;</TD></TR><TR><TD CLASS="quote">they have the same ecu??</TD></TR></TABLE>

Nope. They are different

 

<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by JDMH22HATCH &raquo;</TD></TR><TR><TD CLASS="quote">Nope. They are different</TD></TR></TABLE>yea thats what i thought... given a different redline

 

So I'll need to get a new ecu....but i can still use the wiring harness??????Just trying to find out for my own info...thanks guys