Thread: R32 / Rb25 S2 Swap Tps Question

[lowexr]

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??

Edited April 26, 2012 by lowexr

[DVS JEZ]

U need to use the rb20 tps

[lowexr]

Really??...The RB25 I'll be swaping was in a R32 before with that particular TPS...

If I swap the RB20 TPS, Can I still use the RB25 ECU(Wich was also used in an r32 before)??

[DVS JEZ]

Ahh ur using a 25 ecu. Thats different then

[Willis]

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?

[GTSBoy]

You need to move the 20 TPS over to the 25 TB.

[Willis]

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?

[GTSBoy]

20 TPS is a switch for closed throttle and for WOT. Not variable resistor like the 20 TPS. The 20 TPS has a separate section (the other plug) that is variable resistor for the auto tranny computer.

[kitto]

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]

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]

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

[Willis]

Hmm sounds like abit of a hassle. Returning the ECU i mean.

Still keen to know if i can fit a s1 rb25 throttle body on a s2 intake plenum?

[kitto]

Still keen to know if i can fit a s1 rb25 throttle body on a s2 intake plenum?

Yes. Bolts on. S1 just has the progressive throttle linkage and different TPS shaft.

[Willis]

Excellent, i'll chase down a S1 TB then.

Then simply swap my RB20 TPS over and plug in?