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Thread: R32 / Rb25 S2 Swap Tps Question

lowexr

By lowexr,
in Engines & Forced Induction

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lowexr Apprentice

lowexr

Posted
Posted (edited)

Hey I'm doing RB25 S2 swap in my R32

I'm keeping the R32 wiring harness and the TPS/throttle valve swith connectors are differents on the s2 engine.

Can anybody give me wiring colors or TPS and throttle valve pinout??

post-71218-0-61886900-1335400115_thumb.jpg

post-71218-0-60072200-1335400272_thumb.jpg

Edited by lowexr
  • 6 months later...
Willis Proficient

Willis

Posted
Posted

Finally found some info, been searching for awhile now!

I'm using a RB20 loom and RB20 ECU (Nistune) and swapping in the S2 RB25.

Tonight i tried to remove the TPS from the RB20 to check it out / mock fit it to the RB25 and i couldn't get it off. Didn't pull very hard but it seemed rather connected to the throttle body.

Will the entire RB20 TB fit on the 25? or are we swapping just the sensor? If so is there any information on this? :)

Willis Proficient

Willis

Posted
Posted

Does that work? I removed the RB25 TPS and it looks rather different inside, aka it has a mechanical mechanism or lever that moves with the throttle body which turns the SENSOR.

I coulnd't get my RB20 TPS off.. but from images it looks rather different. It looks like it will bolt there... am i missing something? How does the 20 TPS work? airflow?

kitto Mentor

kitto

Posted
Posted

Sounds like you've got a S2 RB25, you can't switch the RB20 TPS over to the S2 RB25 throttle body.

You'll need an RB25 Series 1 throttle body, the RB20 TPS will bolt straight on.

I'm not sure if the TPS share the linearity, You may be able to wire in the RB25 TPS.

TPS work by sending a 0-5V signal to the ECU. The voltage sent to the ECU depends on the amount the throttle is open. 0% = 0.5V approximately, 100% = Close to 5V IIRC.

Willis Proficient

Willis

Posted
Posted

Darn, ok well if i was to get a S1 Throttle body.. does anyone know if that will bolt on? (i've tried searching..)

Also my RB20 tps plug goes on the S2 RB25 TPS top plug .. both 3 pin. Anyone know if that will work haha?

I've heard one is for the auto.. is it top or bottom?

DVS JEZ Grand Master

DVS JEZ

Posted
Posted

Easiest thing to do is send the ecu back to NIStune, they will rewrite the base image to suit the rb25 TPS.

The rb25 tps can be fitted to rb20 TB but have to change the shafts over and a few other niggly things.

Its easier to wire in the rb25 tps and base image

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