rb25det rev limiter issue - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

JohnDanyal · 06-06-2014, 01:24 AM

So ive been having an issue with my rb25 rev limiter and i cant seem to figure out what the problem is exactly. pretty much the car will pull amazing up until redline but it will not bounce off the limiter, instead and it sounds like some sort of soft cut but it will bog the car down until i let off the throttle. if i get back onto the throttle it will pull up until redline again and do the same thing over again. ive replaced the fuel pump (walbro 255), fpr, fuel filter, spark plugs (gapped to .08), and ive checked the coil packs and they seem fine, ive also replaced the ecu, maf, and coil pack harness with known good ones and it had no affect. this issue has been happening since i completed the swap in january but randomly went away and it was bouncing off the limiter for about a month or so but then it started happening again recently. also the wiring was done by an extremely reputable shop so its unlikely for it to be a wiring problem but who knows. someone plz help

*fliprayzin240sx* · 06-06-2014, 04:35 AM

Hmm...sounds like fuel cut, but never heard of fuel cut kicking in at redline.

JohnDanyal · 06-06-2014, 09:17 AM

it sounds exactly like a fuel cut but it only does it at redline. it will hit full boost (7lbs) and hold it in any gear and wont cut out or anything, just bogs at about 7200rpm. it almost sounds like the ecu is pulling timing for whatever reason

JohnDanyal · 06-07-2014, 04:24 PM

So today I found what could have been a boost leak. It was a loose coupler clamp on the outlet side of the turbo, fixed it and the issue is still there. Checked the tps, it was a just barely out of spec ( .03v closed throttle, 4.0v WOT) so I fixed that also but I have yet to try to hit the limiter.

06-06-2014, 01:24 AM	#1
JohnDanyal Join Date: Jun 2014 Location: Washington Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	rb25det rev limiter issue So ive been having an issue with my rb25 rev limiter and i cant seem to figure out what the problem is exactly. pretty much the car will pull amazing up until redline but it will not bounce off the limiter, instead and it sounds like some sort of soft cut but it will bog the car down until i let off the throttle. if i get back onto the throttle it will pull up until redline again and do the same thing over again. ive replaced the fuel pump (walbro 255), fpr, fuel filter, spark plugs (gapped to .08), and ive checked the coil packs and they seem fine, ive also replaced the ecu, maf, and coil pack harness with known good ones and it had no affect. this issue has been happening since i completed the swap in january but randomly went away and it was bouncing off the limiter for about a month or so but then it started happening again recently. also the wiring was done by an extremely reputable shop so its unlikely for it to be a wiring problem but who knows. someone plz help

06-06-2014, 04:35 AM	#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	Hmm...sounds like fuel cut, but never heard of fuel cut kicking in at redline. __________________ If you think Zilvia has too many assholes... CLICK HERE!!!

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06-06-2014, 09:17 AM	#3
JohnDanyal Join Date: Jun 2014 Location: Washington Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	it sounds exactly like a fuel cut but it only does it at redline. it will hit full boost (7lbs) and hold it in any gear and wont cut out or anything, just bogs at about 7200rpm. it almost sounds like the ecu is pulling timing for whatever reason

06-07-2014, 04:24 PM	#4
JohnDanyal Join Date: Jun 2014 Location: Washington Posts: 9 Trader Rating: (0) Feedback Score: 0 reviews	So today I found what could have been a boost leak. It was a loose coupler clamp on the outlet side of the turbo, fixed it and the issue is still there. Checked the tps, it was a just barely out of spec ( .03v closed throttle, 4.0v WOT) so I fixed that also but I have yet to try to hit the limiter.