RB25det in limp mode please help! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

d-macs13 · 11-06-2012, 02:22 AM

Ok i just helped my friend swap a series 1 rb25det into his s13, and it will start up and idle fine but will not rev past 2500rpm I can't figure out why it's doing this!

1. We cleaned the maf.

2. Checked for boost leaks and there were none to be found.

3. As for the wiring we bought a brand new pre-made harness from (Wiring Specialties.com)

The only thing that I can think of is that the maf is bad??? And the ECU is for a Series 2 Neo Rb25det and we have a Series 1 Rb25det with a Series 1 Harness I don't know if that will make a difference or not.

Please Share Your Thoughts Guys!

*fliprayzin240sx* · 11-06-2012, 01:52 PM

It sounds like a MAF issue, did you guys try another MAF? Also, did you pull any code out of the ECU? From the quick search I did, some folks say you should be able to use S2 ECU on an S1 harness/engine but you can't use an S1 ECU into an S2 setup.

But if you need an S1 ECU and MAF, lemme know. I just pulled mine out for a PFC and a Z32 MAF.

d-macs13 · 11-12-2012, 07:49 PM

sorry for the late post. And no we don't have a extra maf to check if that is the problem and we can't use a z32 maf because we have nothing to retune the ecu! And no code from the ecu we just put on a friends rb25det and it worked fine! but he has the z32 maf with a apexi neo for a tuner

11-06-2012, 02:22 AM	#1
d-macs13 Join Date: Mar 2009 Location: Texas Posts: 42 Trader Rating: (0) Feedback Score: 0 reviews	RB25det in limp mode please help! Ok i just helped my friend swap a series 1 rb25det into his s13, and it will start up and idle fine but will not rev past 2500rpm I can't figure out why it's doing this! 1. We cleaned the maf. 2. Checked for boost leaks and there were none to be found. 3. As for the wiring we bought a brand new pre-made harness from (Wiring Specialties.com) The only thing that I can think of is that the maf is bad??? And the ECU is for a Series 2 Neo Rb25det and we have a Series 1 Rb25det with a Series 1 Harness I don't know if that will make a difference or not. Please Share Your Thoughts Guys!

11-06-2012, 01:52 PM	#2
fliprayzin240sx Man w/ CTSV & a Car Seat Join Date: Aug 2002 Location: Tampa Posts: 17,998 Trader Rating: (19) Rides Gallery: fliprayzin240sx Feedback Score: 19 reviews	It sounds like a MAF issue, did you guys try another MAF? Also, did you pull any code out of the ECU? From the quick search I did, some folks say you should be able to use S2 ECU on an S1 harness/engine but you can't use an S1 ECU into an S2 setup. But if you need an S1 ECU and MAF, lemme know. I just pulled mine out for a PFC and a Z32 MAF. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

11-12-2012, 07:49 PM	#3
d-macs13 Join Date: Mar 2009 Location: Texas Posts: 42 Trader Rating: (0) Feedback Score: 0 reviews	sorry for the late post. And no we don't have a extra maf to check if that is the problem and we can't use a z32 maf because we have nothing to retune the ecu! And no code from the ecu we just put on a friends rb25det and it worked fine! but he has the z32 maf with a apexi neo for a tuner