S13 with RB25 swap Speedo and RPM off need fix!

[onesick350]

I have looked around a little about this issue and also have PMed a couple of peeps but anyone have any fixes I can look into to fix my Speedo and RPM etc Gauge Cluster on my S13 with a RB25 swap in it??

Josh

[s13point5]

which cluster are you using DOHC or SOHC? http://www.lsauto.com

[onesick350]

DOHC KA

[lilskyline240]

easiest thing you can do is take ur cluster out and send it to Carl H on this forum and he will adjust it for you so its EXACTLY at the right RPM. doesnt cost much either.

Thats what i did and im VERY happy knowing my exact RPM

[onesick350]

Can he adjust the Speedo as well.

Josh

[BoostFab]

Can he adjust the Speedo as well.

Josh

edit : plug a z32 speed sensor in place of the rb25det speed sensor, your problem solved as far as putting out mph.
Modified by BoostFab at 11:29 PM 6/12/2008

[onesick350]

Thanks for the help I appreciate it.

Josh

[BHFR-GTR]

what do you mean by plugging a s14 sensor into the rb25 sensor??

[l0nestar]

plug a s14 speed sensor into the rb25det sensor, your problem solved as far as putting out mph.

Would you venture to speculate if an S14 AT speed sensor would work also? Or does it need to be from a 5-MT?

[Neejay]

what do you mean by plugging a s14 sensor into the rb25 sensor??

+1 on that question...

[TenjoTenge]

what he meant was to interchange the speedsensor on the gearbox with the sensor from your ka gearbox. should fit.

but im more intrested in wiring ... the wire of the speed sensor (yellow/green) ends up in ecu pin 53. from my ca18 speedo cluster there comes also a yellow green wire.

so i spliced the one at the ecu and connectet it to the speedo. should work, cause its ttl, but nothing happens -.-"

[craz4240]

what he meant was to interchange the speedsensor on the gearbox with the sensor from your ka gearbox. should fit.

but im more intrested in wiring ... the wire of the speed sensor (yellow/green) ends up in ecu pin 53. from my ca18 speedo cluster there comes also a yellow green wire.

so i spliced the one at the ecu and connectet it to the speedo. should work, cause its ttl, but nothing happens -.-"

The KA speed sensor wil not work in the rb25 as the gear shaft is not long enough.

[BoostFab]

sorry for the mix up guys.

edit: plug a z32 speed sensor in place of the rb25det speed sensor, your problem solved as far as putting out mph.

alternative option: use the Dakota Digital SGI-5 for converting your rb25 speed sensor to mph.

[TenjoTenge]

rotfl .... thanks for your help, im sry for my wrong post (ka sensor in rb25 transmission) ... but i have neitgter a 25tranny nor a ka speed sensor ... i had a ca18det upgraded to an rb20det ... and now i got my prob ...

it musst be a connection prob on my car. there is no speed singal on the ecu (yellow green wire, pin53 on the ecu) and there is also no rpm signal on the ecu (yellow red/ pin 7 or so) ....

at the moment i sit at my girlfriends house because of loosing 2 (of these white stones in my mouth, teeths or so ) by the dentist ... and in this time i want to do my homework

- the speedsensor should work- the cluster works also- the yellow/green wire vom the ca cluster is connetet to the yellow green wire on pin 53 on the ecu (colors are ) - with the rpm meter its the same ... yellow red on ecupin 7 or so, color is right

so is there something i missed to konnect? should be the same with rb-wiring-harness! i heard the speedo wire goes first to the relaisbox bevor it goes to the ecu, is this right?

greetings,Chris

[onesick350]

I am gonna try this out and also get Carl to get the RPM fixed up, thatnks guys for the info.

Josh

[Neejay]

sorry for the mix up guys.

edit: plug a z32 speed sensor in place of the rb25det speed sensor, your problem solved as far as putting out mph.

alternative option: use the Dakota Digital SGI-5 for converting your rb25 speed sensor to mph.

Ok, so a Z32 NA speed sensor will let my USDM DOHC speedometer read correctly (mph and correct speed)? I keep reading conflicting results on this via a few other google searches.

Just want to confirm before I buy one.
Modified by Neejay at 11:15 PM 1/25/2009

[UndftdSole]

ive been contemplating about this topic too. RPM can easily be fixed but I am worried about the speedo too. does the Dakota Digital SGI-5 really work? and what about the z32 speed sensor?

[johnny butt]

i'd like to inquire about the speed sensor as well.

i created a topic a good 3-4 months ago but no one really knew / answered.

I decided against it, since my speedometer reads about half of my actual speed. Good enough for me. (reads 35 MPH while driving 70.)

[Carl H]

zerothread?id=392355

[rb25det250sx]

hey i thought u couldnt use the stock tach because of how the engines count rpm.. there different and on teh s13 tachs it count different beacuse it runs in plug wires instead of indavidual coil packs like the rbs do... let me know please im having that trouble to...

[Bluefire]

i'd like to inquire about the speed sensor as well.

i created a topic a good 3-4 months ago but no one really knew / answered.

I decided against it, since my speedometer reads about half of my actual speed. Good enough for me. (reads 35 MPH while driving 70.)

you can use a JDM S13 speedo thats reads up to 240kph and use the pot on the back to adjust to mph. I've done this on 2 cars and they both work perfectly. This works only on S13's with RB25's where the factory speedo reads slow. i have some JDM speedos as well, if anyone needs them...

[Neejay]

you can use a JDM S13 speedo thats reads up to 240kph and use the pot on the back to adjust to mph. I've done this on 2 cars and they both work perfectly. This works only on S13's with RB25's where the factory speedo reads slow. i have some JDM speedos as well, if anyone needs them...

I just turned the pot on the back of mine last night (all the way left to start out). I won't be able to plug it in until today though. I'll have to splice my speed wire from the ecu with my turbo timer, and use that to calibrate it.

How much "adjusting" did you have to do with the pot?

[Carl H]

wont work, you need an external device like a gps unit to calibrate the tach as the ecu signal is generated thru the speedo head.

[Neejay]

wont work, you need an external device like a gps unit to calibrate the tach as the ecu signal is generated thru the speedo head.

Damn. I'll borrow my mom's or girlfriend's parents' GPS unit then. Thanks Carl.

[DeformityX]

i'd like to inquire about the speed sensor as well.

i created a topic a good 3-4 months ago but no one really knew / answered.

I decided against it, since my speedometer reads about half of my actual speed. Good enough for me. (reads 35 MPH while driving 70.)

a '96 300zx N/a Speed Sensor will work. MPH will be dead on. Did it today and i confirm it!

[johnny butt]

a '96 300zx N/a Speed Sensor will work. MPH will be dead on. Did it today and i confirm it!

Hm, makes sense that it would work... transmissions are almost the same with the exception of how it's putting out (MPH or KPH)

How was your speedometer reading before you switched sensors out? Was it reading half like mine, or what? Did you have to adjust it at all, or just switch out the sensors?

I'm still kind of weary as to whether or not I wanna drop 80$ for this part...

[DeformityX]

Hm, makes sense that it would work... transmissions are almost the same with the exception of how it's putting out (MPH or KPH)

How was your speedometer reading before you switched sensors out? Was it reading half like mine, or what? Did you have to adjust it at all, or just switch out the sensors?

I'm still kind of weary as to whether or not I wanna drop 80$ for this part...

I wouldnt say it was reading like exactly half... but yeah around that ballpark... and no, didnt have to adjust anything at ALL. I removed the RB25 speed sensor, swapped the gear tips(Red plastic, you will need some snap ring pliers), then had to pop the collar out of the inside of the sensor coupling (On both sensors) and swap them with each other. The sensor coupling collar coming out of the RB25 Sensor should snap right into the N/a 300zx Sensor's coupling, then pop it into the trans, connect the coupling, and roll out... Mine was 100% dead on, tested yesterday evening with my Megellan GPS from 0 through 80 it is 100% accurate. No Adjustment needed.

[sean8564]

i just bought a R32 gauge cluster from Ebay and swapped out tachs you might not have a clock plus you vae a little trimming nothing scissors will not fix but it works it cost me only 20 bucks plus shipping

[DeformityX]

i just bought a R32 gauge cluster from Ebay and swapped out tachs you might not have a clock plus you vae a little trimming nothing scissors will not fix but it works it cost me only 20 bucks plus shipping

I might have to do that...

[sean8564]

it worked on my Silvia for 3 year with out a problem. I lost my clock cause it was in the way when i screwed it down and had to trim around the edges but it works fine it is the only light Grey gauge on my cluster though