more speed more speed!!! - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

s13cruzer · 12-21-2001, 12:33 AM

ok , i'm kinda new to this but have big plans for the future , but first , where is the #### speed limiter on my car and how do i get rid of it safely?
                          '90 240sx fastback

*AceInHole* · 12-21-2001, 12:45 AM

I'm not sure if there is a way for SOHC's to disable the speed limiter.  At least, it isn't documented.  For info on the DOHC speed limit cut check
http://www.240sx.org ,
it's in the FAQ.  
Maybe you can see if your ECU has the same wire color/stripe and position.  If it doesn't have both, I wouldn't mess with it.

The other way to get rid of it would be the Apexi Rev/Speed meter.  At least I've heard it intercepts the speed signal and disables the governor by "tricking" the ecu.

240booster · 12-21-2001, 01:17 AM

<a href="http://www.zilvia.net/forum/topic.cgi?forum=1&topic=1619&start=0

I" target="_blank">http://www.zilvia.net/forum....t=0

I</a> just did it man make sure u cut the right wire and u will be ok although im not sure about this for the SOHC mine is a DOHC s14

*LanceS13* · 12-21-2001, 02:08 PM

I cut that wire on the ecu and now instead of the engine just quitting at 5100rpm (5th gear) it starts vibrating violently (rev limiter) at 5200rpm.  I does the same in fourth gear (different rpm limiter--6300? forgot).  So I probably gained a whole 3 mph top speed from doing this.  Where is that backup limiter?  And how are you (240booster) hitting 125?

240booster · 12-22-2001, 02:33 AM

welll urs is an s13 so maybe a little different than my s14 but im hitting the same 5th gear rev limiter ur talking about at about 5500 rpm i think and my speedo only goes to 120 so im guestimating im topping out at about 125 now ....   there is a FAQ at 240sx.org about that 5th gear rev limiter u have to disconnect some plug at the tranny i think and something else check it out ... then the sky should be the limit .... lol untill u blow ur motor   :-P

12-21-2001, 12:33 AM	#1
s13cruzer Zilvia Junkie Join Date: Dec 2001 Location: lynn , massachusetts Posts: 358 Trader Rating: (0) Feedback Score: 0 reviews	ok , i'm kinda new to this but have big plans for the future , but first , where is the #### speed limiter on my car and how do i get rid of it safely?                           '90 240sx fastback

12-21-2001, 12:45 AM	#2
AceInHole Autox Technician Join Date: Dec 2001 Location: New Haven, CT Age: 44 Posts: 3,961 Trader Rating: (0) Rides Gallery: AceInHole Feedback Score: 0 reviews	I'm not sure if there is a way for SOHC's to disable the speed limiter.  At least, it isn't documented.  For info on the DOHC speed limit cut check http://www.240sx.org , it's in the FAQ.   Maybe you can see if your ECU has the same wire color/stripe and position.  If it doesn't have both, I wouldn't mess with it. The other way to get rid of it would be the Apexi Rev/Speed meter.  At least I've heard it intercepts the speed signal and disables the governor by "tricking" the ecu.

12-21-2001, 01:17 AM	#3
240booster Zilvia Member Join Date: Oct 2001 Posts: 245 Trader Rating: (0) Feedback Score: 0 reviews	<a href="http://www.zilvia.net/forum/topic.cgi?forum=1&topic=1619&start=0 I" target="_blank">http://www.zilvia.net/forum....t=0 I</a> just did it man make sure u cut the right wire and u will be ok although im not sure about this for the SOHC mine is a DOHC s14

12-21-2001, 02:08 PM	#4
LanceS13 AutoX Junkie Join Date: Jun 2001 Location: MS Age: 43 Posts: 2,044 Trader Rating: (0) Feedback Score: 0 reviews	I cut that wire on the ecu and now instead of the engine just quitting at 5100rpm (5th gear) it starts vibrating violently (rev limiter) at 5200rpm.  I does the same in fourth gear (different rpm limiter--6300? forgot).  So I probably gained a whole 3 mph top speed from doing this.  Where is that backup limiter?  And how are you (240booster) hitting 125?

12-22-2001, 02:33 AM	#5
240booster Zilvia Member Join Date: Oct 2001 Posts: 245 Trader Rating: (0) Feedback Score: 0 reviews	welll urs is an s13 so maybe a little different than my s14 but im hitting the same 5th gear rev limiter ur talking about at about 5500 rpm i think and my speedo only goes to 120 so im guestimating im topping out at about 125 now ....   there is a FAQ at 240sx.org about that 5th gear rev limiter u have to disconnect some plug at the tranny i think and something else check it out ... then the sky should be the limit .... lol untill u blow ur motor   :-P