1G S90 70mm TB install on 90' GSX

[I21chardh]

Hello Im not sure if there another article already covering this but I have a 70mm S90 TB that will be going on my 90 GSX. Correct me if I'm wrong but I will need a 1GB or 2G lower IAC/FIAV unit to mount to the s90 but will need to rewire the connector for IAC to work with 90 harness. I can just swap over the original TPS to s90 and will not need to rewire the connectors?

 

[Car Cannibal]

Just did the 74mm S90, TPS swaps over no connectors needed.

I did the block off plate for ISC/IAC so I'm not sure on that.

 

[1cleangsx]

I switched to a 2g tps on my 90 when I installed the s90, i ran an adapter harness from OhmRacing. I also deleted the fiav/isc, however you could run a fiav/isc from a 91-94 throttle body as it separates from the upper portion of the throttle body unlike the 90 model which I assume you know that. Only thing about deleting the fiav/isc is you have to baby the pedal on cold starts for 5 minutes or so which I personally don’t mind but everyone’s different