Sr wont go over 65 when trans harness is plugged in - Zilvia.net Forums | Nissan 240SX (Silvia) and Z (Fairlady) Car Forum

kaking · 12-26-2011, 11:40 AM

Sr in s14
Wiring specialties upper and lower harness

Car drove fine when i had the ka harness plugged in w/o speedo. But now that i have everything hooked up the car wont go above 65 & the speedometer reads 115-120mph. Can the speedometer be acting like a fuel cut to the ecu? And why would the speedometer be that far off?

kaking · 12-28-2011, 04:30 PM

anyone have any thoughts

eli-s13 · 12-28-2011, 05:00 PM

sounds like you have the sr speed sensor so your reading in kilometers so you need the ka speed sensor to read mph

rcdad123 · 12-28-2011, 11:36 PM

also, you might have a built in speed limiter on the ecu. some older jdm ecu`s have that. i remember back in the day when jdm honda b16a`s were popular. they had a 112 mph speed limiter. we used to use Fields SAFC to defeat it. check on that.

Sileighty_85 · 12-29-2011, 09:10 AM

Quote:

Originally Posted by eli-s13

sounds like you have the sr speed sensor so your reading in kilometers so you need the ka speed sensor to read mph

Wrong, USDM & JSPEC VSS are exactly the same.

SR's have a speed cut at 120 so if ur gauge is messed up and sending the 120 signal to the ECU then it will cut out

eli-s13 · 12-29-2011, 09:26 AM

Quote:

Wrong, USDM & JSPEC VSS are exactly the same.

SR's have a speed cut at 120 so if ur gauge is messed up and sending the 120 signal to the ECU then it will cut out

Okay yes then speed sensors are the same but there gear that turns it wont be rite? The gear is what is gonna spin it faster or slower changing the resistance, which will change the signal voltage. Or is it the gauge cluster itself that is read in kph. Correct me if im wrong but pretty sure the car is reading kph not mph.

Killa_D · 12-29-2011, 09:42 AM

Quote:

Originally Posted by eli-s13

Okay yes then speed sensors are the same but there gear that turns it wont be rite? The gear is what is gonna spin it faster or slower changing the resistance, which will change the signal voltage. Or is it the gauge cluster itself that is read in kph. Correct me if im wrong but pretty sure the car is reading kph not mph.

what your saying sounds correct but i have always used jdm speed sensor and they all read correctly in mph i think what changes is the actual cluster. The speed sensors are the same.

anarchyperf · 12-29-2011, 10:10 AM

I'm assuming you have a s13 SR correct? You need the s14 speed sensor. Quick fix is to cut the yellow/green wire going into the ecu. This is your VSS signal to ecu

kaking · 12-30-2011, 08:42 PM

Thanks guys...Wiring specialties makes the harness to work with the SR speed sensor so im pretty sure its not the speed sensor. But it does make sense that id need the s14 speed sensor instead of s13 for it to work with the cluster

Anarchyperf- yes its a s13 SR in a s14

Sileighty_85 · 12-30-2011, 08:56 PM

Quote:

Originally Posted by kaking

Anarchyperf- yes its a s13 SR in a s14

Missed that part, that's ur issue

kaking · 12-31-2011, 07:02 PM

So get a s14 SR speed sensor and i should be good to go? Guessing both ka and sr s14 speed sensor will work, id just need to rewire the speed sensor plug if i chose to use the ka speed sensor....Correct? Just making sure

Sileighty_85 · 12-31-2011, 11:47 PM

you gotta match the VSS with the cluster.
S13 Speedo= S13 VSS
S14 Speedo= S14 VSS

KA and SR are exactly the Same.

kaking · 01-01-2012, 12:03 PM

Got it, thanks

Taylor008 · 01-02-2012, 07:32 AM

You're gonna need the pigtail with that speed sensor.

Kingtal0n · 01-07-2012, 09:39 PM

I have an S13 sr in my S14. I think I used the KA Speed sensor from the original engine. Didnt touch anything else- works fine.

12-26-2011, 11:40 AM	#1
kaking Users Awaiting Email Confirmation Join Date: Apr 2007 Location: san jose CA Posts: 433 Trader Rating: (7) Feedback Score: 7 reviews	Sr wont go over 65 when trans harness is plugged in Sr in s14 Wiring specialties upper and lower harness Car drove fine when i had the ka harness plugged in w/o speedo. But now that i have everything hooked up the car wont go above 65 & the speedometer reads 115-120mph. Can the speedometer be acting like a fuel cut to the ecu? And why would the speedometer be that far off?

12-29-2011, 10:10 AM	#8
anarchyperf Zilvia Member Join Date: Dec 2010 Location: Nazareth, Pa Age: 39 Posts: 194 Trader Rating: (1) Feedback Score: 1 reviews	I'm assuming you have a s13 SR correct? You need the s14 speed sensor. Quick fix is to cut the yellow/green wire going into the ecu. This is your VSS signal to ecu __________________ www.anarchyperformance.com - Your source for 240sx Performance! https://www.facebook.com/anarchyperformance - Like us on facebook Email: [email protected]

12-31-2011, 11:47 PM	#12
Sileighty_85 Post Whore! Join Date: Dec 2006 Location: Misawa, Japan Posts: 6,815 Trader Rating: (8) Feedback Score: 8 reviews	you gotta match the VSS with the cluster. S13 Speedo= S13 VSS S14 Speedo= S14 VSS KA and SR are exactly the Same. __________________ 後輪駆動車１番 1989 Built SR GT2871R -363whp 1998 S14 W/RB25- 250ish (For Now) 1986 SR86 - 200ish 1990 R32 GTR - 320hp Don't Buy Engines from JDM-Online http://zilvia.net/f/businesses/207457-jdm-online.html Don't Buy XS-Power or SSAC Shit

12-28-2011, 04:30 PM	#2
kaking Users Awaiting Email Confirmation Join Date: Apr 2007 Location: san jose CA Posts: 433 Trader Rating: (7) Feedback Score: 7 reviews	anyone have any thoughts

12-28-2011, 05:00 PM	#3
eli-s13 Zilvia Member Join Date: Jul 2011 Location: Walnut/SoCal Age: 33 Posts: 215 Trader Rating: (6) Feedback Score: 6 reviews	sounds like you have the sr speed sensor so your reading in kilometers so you need the ka speed sensor to read mph

12-28-2011, 11:36 PM	#4
rcdad123 Zilvia Addict Join Date: Jul 2011 Location: san diego Posts: 639 Trader Rating: (0) Feedback Score: 0 reviews	also, you might have a built in speed limiter on the ecu. some older jdm ecu`s have that. i remember back in the day when jdm honda b16a`s were popular. they had a 112 mph speed limiter. we used to use Fields SAFC to defeat it. check on that.

12-30-2011, 08:42 PM	#9
kaking Users Awaiting Email Confirmation Join Date: Apr 2007 Location: san jose CA Posts: 433 Trader Rating: (7) Feedback Score: 7 reviews	Thanks guys...Wiring specialties makes the harness to work with the SR speed sensor so im pretty sure its not the speed sensor. But it does make sense that id need the s14 speed sensor instead of s13 for it to work with the cluster Anarchyperf- yes its a s13 SR in a s14

12-31-2011, 07:02 PM	#11
kaking Users Awaiting Email Confirmation Join Date: Apr 2007 Location: san jose CA Posts: 433 Trader Rating: (7) Feedback Score: 7 reviews	So get a s14 SR speed sensor and i should be good to go? Guessing both ka and sr s14 speed sensor will work, id just need to rewire the speed sensor plug if i chose to use the ka speed sensor....Correct? Just making sure

01-01-2012, 12:03 PM	#13
kaking Users Awaiting Email Confirmation Join Date: Apr 2007 Location: san jose CA Posts: 433 Trader Rating: (7) Feedback Score: 7 reviews	Got it, thanks

01-02-2012, 07:32 AM	#14
Taylor008 Leaky Injector Join Date: Feb 2008 Location: Utah Age: 32 Posts: 135 Trader Rating: (1) Feedback Score: 1 reviews	You're gonna need the pigtail with that speed sensor.

01-07-2012, 09:39 PM	#15
Kingtal0n Post Whore! Join Date: Jul 2005 Location: South Florida Age: 41 Posts: 4,829 Trader Rating: (17) Feedback Score: 17 reviews	I have an S13 sr in my S14. I think I used the KA Speed sensor from the original engine. Didnt touch anything else- works fine.