S13 speed limiter removal info for y'all... - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

orange-grey · 09-07-2002, 08:08 PM

I read someone's post about removing the speed cut on an S14 a couple days ago and thought I would try it on my S13. It involved disconnecting the 5th gear sensor on the trans and cutting a yellow ECU wire with a green stripe and two silver dots every inch or so. On the S13 (at least mine) there is no such wire, but a yellow wire with a green stripe and a single silver band about every inch. There's actually two such wires, but only one goes into the ECU while the other bypasses it. I checked my Chilton's schematic and confirmed that this is still the speedo wire. I figured theres enough slack to splice it back together if it didn't work, so I went ahead and cut the one going into the ECU. Whoo-hoo, I took it out in the country and managed to wrap the speedo needle to the first odometer number! Although this proceedure is supposed to turn on the check engine light on the S14, mine has not come on. It flashes on startup, so I'm sure it works. I might put a switch in the kickpanel so I can turn it on or off if the light ever goes on. The 5th gear sensor is the same as the S14, its the rearmost one in the cluster of three small sensors on the right side of the tranny. Hope this helps somebody out there. BTW, my S13 is a '91 with the stock KA24DE and ECU. And of course, I'm not responsible if you screw up, get a ticket, blah blah blah, etc.

Natty · 09-08-2002, 12:46 PM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (orange-grey @ Sep. 06 2002,10:08)</td></tr><tr><td id="QUOTE"> Whoo-hoo, I took it out in the country and managed to wrap the speedo needle to the first odometer number!</td></tr></table><span id='postcolor'>
Heh, you're my hero  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/thumbs-up.gif" border="0" valign="absmiddle" alt=':thumbsup:'>
I read that one post and allt he side effects scared me off, then at Radio Shack today, I saw some switches I could mount on the kick panel if I extended the wires. Just like you are thinking about doing.

hell, I may try that. I tried to whoop up on an automatic riced out Saturn SC2 on the interstate and I had it until I was coming up to my governor, so I backed off  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/cry.gif" border="0" valign="absmiddle" alt='

'>

Thanks for being cool enough to be a guinea pig <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/sly.gif" border="0" valign="absmiddle" alt=':sly:'>

Jeff

luke91 · 09-08-2002, 02:38 PM

any way to do it to an s13 sr20det?

91white240sx · 09-09-2002, 09:26 PM

i took the speed limiter out of my SR20 by cutting that wire and i hooked it up to a switch and it works fine no problem yet. gonna try and to the 5th gear tranny thing this weekend.

Mtt22 · 09-09-2002, 09:35 PM

i dont get why you would do both, would not one or the other work?

*LanceS13* · 09-09-2002, 09:41 PM

</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (Mtt22 @ Sep. 09 2002,10:35)</td></tr><tr><td id="QUOTE">i dont get why you would do both, would not one or the other work?</td></tr></table><span id='postcolor'>
nope

Mtt22 · 09-10-2002, 03:18 PM

why not? if you cut the wire the computer will not be able to read yoru speed, and if you remove your 5th gear sensor.... fuck i dont get it

DuffMan · 09-10-2002, 04:41 PM

My understanding of it is the tranny has a sensor on the output shaft of the tranny to measure absolute speed. However there is also a sensor to tell what gear you are in. If you are in 5th it makes the rev limit lower.

For a demonstration of this, put it in 5th while stopped, and rev it up while hodling the clutch down. It will only let you rev to arround 5000something.

Mtt22 · 09-10-2002, 05:16 PM

oh, it all makes sence now, thanks

Fresh 240SX · 09-10-2002, 05:43 PM

So there were no negative effects upon cutting this wire?

Mtt22 · 09-10-2002, 05:53 PM

there is one, apparently once you cut the wire the ecu goes into some kinda "warning mode" or something and no  longer stores codes or something, i dunno, was in the last speed limiter removal post a few weeks back

luke91 · 09-10-2002, 05:58 PM

Wich two wires are we talking about here, exactly?  Am I correct in assuming that if you disconnect the speed sensor, you render your speedometer useless, making this modification useful only for racing purposes, not for determining top speed?  Anyway, where is the fifth gear sensor, and is the crucial wire on the SR20 still yellow w/green?  All I remember hooking up when doing the swap was the reverse, and speed sensor.  It's been a while, though...
We are still talking about SR20's here, right?
--luke

mechaniac · 09-11-2002, 12:34 AM

hey, I tried that and for some reason, my car wouldn't let me rev past 4500 in 4th gear, and 4000 in fifth, plus I couldn't go over 90!  what gives?  is this because I could have pulled off the wrong tranny sensor?  which one am I supposed to pull off? <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'>

i hate rice rockets · 09-20-2002, 10:47 AM

lolz mechanic...thats fucken funny..

09-08-2002, 12:46 PM	#2
Natty Zilvia Addict Join Date: Dec 2001 Location: Nashville, TN Posts: 944 Trader Rating: (0) Feedback Score: 0 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (orange-grey @ Sep. 06 2002,10:08)</td></tr><tr><td id="QUOTE"> Whoo-hoo, I took it out in the country and managed to wrap the speedo needle to the first odometer number!</td></tr></table><span id='postcolor'> Heh, you're my hero  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/thumbs-up.gif" border="0" valign="absmiddle" alt=':thumbsup:'> I read that one post and allt he side effects scared me off, then at Radio Shack today, I saw some switches I could mount on the kick panel if I extended the wires. Just like you are thinking about doing. hell, I may try that. I tried to whoop up on an automatic riced out Saturn SC2 on the interstate and I had it until I was coming up to my governor, so I backed off  <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/cry.gif" border="0" valign="absmiddle" alt=''> Thanks for being cool enough to be a guinea pig <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/sly.gif" border="0" valign="absmiddle" alt=':sly:'> Jeff __________________ 1991 White 240sx Fastback LE, rusty spoiler, weak driveshaft, exhaust rattle.... Rattles are just your cars way of saying 'I love you.'

09-08-2002, 02:38 PM	#3
luke91 Zilvia Member Join Date: Sep 2002 Location: Pittsburgh, PA Age: 44 Posts: 218 Trader Rating: (0) Feedback Score: 0 reviews	any way to do it to an s13 sr20det? __________________ '91 fastback.  '97 S13 blktop SR20DET.  Cstm Frnt Mnt IC w/ cstm 2 1/2" piping.  stnls stl fltr.  3" cstm DP & exhst w/N1 muff.  Walbro FP.  ACT 6 pck cltch.  Go Fast Bits crnk plly.  Ground Control coils.  KYB AGX shks.  12.98@106 w/g-tech pro.  17psi.  All work and fabrication done by ME

09-09-2002, 09:35 PM	#5
Mtt22 Leaky Injector Join Date: Jun 2002 Posts: 79 Trader Rating: (0) Feedback Score: 0 reviews	i dont get why you would do both, would not one or the other work? __________________ Matt "andy offers kevin pudding at 9, if andy is 7 years older then pudding than how many liters of andy does it take to get to detroit?" "There are 3 types of people in this world. People who can count, and people who cant.." ""Save the Whales" (Trade them for valuable prizes)"

09-09-2002, 09:41 PM	#6
LanceS13 AutoX Junkie Join Date: Jun 2001 Location: MS Age: 43 Posts: 2,044 Trader Rating: (0) Feedback Score: 0 reviews	</span><table border="0" align="center" width="95%" cellpadding="3" cellspacing="1"><tr><td>Quote (Mtt22 @ Sep. 09 2002,10:35)</td></tr><tr><td id="QUOTE">i dont get why you would do both, would not one or the other work?</td></tr></table><span id='postcolor'> nope __________________ 1992 240SX Fastback #47 DSP MS SCCA RX-7 ITS Project FOR SALE

09-10-2002, 03:18 PM	#7
Mtt22 Leaky Injector Join Date: Jun 2002 Posts: 79 Trader Rating: (0) Feedback Score: 0 reviews	why not? if you cut the wire the computer will not be able to read yoru speed, and if you remove your 5th gear sensor.... fuck i dont get it __________________ Matt "andy offers kevin pudding at 9, if andy is 7 years older then pudding than how many liters of andy does it take to get to detroit?" "There are 3 types of people in this world. People who can count, and people who cant.." ""Save the Whales" (Trade them for valuable prizes)"

09-07-2002, 08:08 PM	#1
orange-grey Leaky Injector Join Date: Aug 2002 Posts: 94 Trader Rating: (0) Feedback Score: 0 reviews	I read someone's post about removing the speed cut on an S14 a couple days ago and thought I would try it on my S13. It involved disconnecting the 5th gear sensor on the trans and cutting a yellow ECU wire with a green stripe and two silver dots every inch or so. On the S13 (at least mine) there is no such wire, but a yellow wire with a green stripe and a single silver band about every inch. There's actually two such wires, but only one goes into the ECU while the other bypasses it. I checked my Chilton's schematic and confirmed that this is still the speedo wire. I figured theres enough slack to splice it back together if it didn't work, so I went ahead and cut the one going into the ECU. Whoo-hoo, I took it out in the country and managed to wrap the speedo needle to the first odometer number! Although this proceedure is supposed to turn on the check engine light on the S14, mine has not come on. It flashes on startup, so I'm sure it works. I might put a switch in the kickpanel so I can turn it on or off if the light ever goes on. The 5th gear sensor is the same as the S14, its the rearmost one in the cluster of three small sensors on the right side of the tranny. Hope this helps somebody out there. BTW, my S13 is a '91 with the stock KA24DE and ECU. And of course, I'm not responsible if you screw up, get a ticket, blah blah blah, etc.

09-09-2002, 09:26 PM	#4
91white240sx Join Date: Aug 2002 Posts: 28 Trader Rating: (0) Feedback Score: 0 reviews	i took the speed limiter out of my SR20 by cutting that wire and i hooked it up to a switch and it works fine no problem yet. gonna try and to the 5th gear tranny thing this weekend.

09-10-2002, 04:41 PM	#8
DuffMan Post Whore! Join Date: Oct 2001 Location: in a cardboard box Posts: 2,517 Trader Rating: (0) Feedback Score: 0 reviews	My understanding of it is the tranny has a sensor on the output shaft of the tranny to measure absolute speed. However there is also a sensor to tell what gear you are in. If you are in 5th it makes the rev limit lower. For a demonstration of this, put it in 5th while stopped, and rev it up while hodling the clutch down. It will only let you rev to arround 5000something.

09-10-2002, 05:16 PM	#9
Mtt22 Leaky Injector Join Date: Jun 2002 Posts: 79 Trader Rating: (0) Feedback Score: 0 reviews	oh, it all makes sence now, thanks __________________ Matt "andy offers kevin pudding at 9, if andy is 7 years older then pudding than how many liters of andy does it take to get to detroit?" "There are 3 types of people in this world. People who can count, and people who cant.." ""Save the Whales" (Trade them for valuable prizes)"

09-10-2002, 05:43 PM	#10
Fresh 240SX Zilvia Junkie Join Date: Mar 2002 Location: Niagara Region, Canada Age: 41 Posts: 478 Trader Rating: (0) Feedback Score: 0 reviews	So there were no negative effects upon cutting this wire? __________________

09-10-2002, 05:53 PM	#11
Mtt22 Leaky Injector Join Date: Jun 2002 Posts: 79 Trader Rating: (0) Feedback Score: 0 reviews	there is one, apparently once you cut the wire the ecu goes into some kinda "warning mode" or something and no  longer stores codes or something, i dunno, was in the last speed limiter removal post a few weeks back __________________ Matt "andy offers kevin pudding at 9, if andy is 7 years older then pudding than how many liters of andy does it take to get to detroit?" "There are 3 types of people in this world. People who can count, and people who cant.." ""Save the Whales" (Trade them for valuable prizes)"

09-10-2002, 05:58 PM	#12
luke91 Zilvia Member Join Date: Sep 2002 Location: Pittsburgh, PA Age: 44 Posts: 218 Trader Rating: (0) Feedback Score: 0 reviews	Wich two wires are we talking about here, exactly?  Am I correct in assuming that if you disconnect the speed sensor, you render your speedometer useless, making this modification useful only for racing purposes, not for determining top speed?  Anyway, where is the fifth gear sensor, and is the crucial wire on the SR20 still yellow w/green?  All I remember hooking up when doing the swap was the reverse, and speed sensor.  It's been a while, though... We are still talking about SR20's here, right? --luke __________________ '91 fastback.  '97 S13 blktop SR20DET.  Cstm Frnt Mnt IC w/ cstm 2 1/2" piping.  stnls stl fltr.  3" cstm DP & exhst w/N1 muff.  Walbro FP.  ACT 6 pck cltch.  Go Fast Bits crnk plly.  Ground Control coils.  KYB AGX shks.  12.98@106 w/g-tech pro.  17psi.  All work and fabrication done by ME

09-11-2002, 12:34 AM	#13
mechaniac Join Date: Dec 2001 Posts: 5 Trader Rating: (0) Feedback Score: 0 reviews	hey, I tried that and for some reason, my car wouldn't let me rev past 4500 in 4th gear, and 4000 in fifth, plus I couldn't go over 90!  what gives?  is this because I could have pulled off the wrong tranny sensor?  which one am I supposed to pull off? <img src="http://www.zilvia.net/f/iB_html/non-cgi/emoticons/confused.gif" border="0" valign="absmiddle" alt='???'> __________________ strive to be the fastest

09-20-2002, 10:47 AM	#14
i hate rice rockets Leaky Injector Join Date: Jan 2002 Posts: 86 Trader Rating: (0) Feedback Score: 0 reviews	lolz mechanic...thats fucken funny.. __________________ 95 240sx Se.. soon to have an SR