tach & speedo

[lucky7]

i know this has been covered. but what are the majority of you using? i dont want KPH, so an R33 cluster is out of the question... i emailed the folks at ls auto today. they only show an S14 tach on their site. i want to know if they have the speedo also.

ive also considered having my shop make a custom cluster with Defi's. but i cant seem to find a speedo, or fuel gauge. i would like them mounted on CF. but im hesitant because i like my odometer.

last thing. stack cluster. Sard, Defi, and HKS make them. i can only find info on the sard. the defi looks amazing IMO and would probably be comparable in price with a custom cluster with CF and defi's.

i would really just like to know what everyone else is doing and how they like it.

thanks.

[Valley]

r33 cluster and a little knowledge on mph/kph conversions.

[lucky7]

i would prefer to find an alternative route.

[lucky7]

this is the response i got from kevin at ls auto.

" Kevin Wells to me More options 3:28 am (11 hours ago)

We can help you. first we will need your cluster to calibrate the tach two 6 cylinder. On the speedo the sending unit on the rb and S14 are the same pulses per revolution if you have the big rb25 transmission. you can tell the difference by the output shaft size if it is a larger shaft then the sr or ka trans then you are fine. Hope this helps ThanksKevin"

so it sounds like this will work in my favor for cheaper than an R33 cluster. i have but one question. i had no idea there were 2 different size RB25 trannies. or am i missunderstanding his wording? i have the S2 transmission, therefore the speedo should be fine as-is..... right?

[Shocker]

there is one rb25 transmission, hes saying if its larger than the SR/KA transmission your good.

[lucky7]

there is one rb25 transmission, hes saying if its larger than the SR/KA transmission your good.

thats what i assumed. but i was just a bit confused. SO, basically all i need is the tach recalibrated from LS auto and im all set? thats how im interpreting this.

[blues14]

ls auto is calibrating my s14 tach as we speak. I cant wait to get it back and get rid of that nasty aftermarket tach. doesnt the usdm ka transmission sensor fit in the rb25 transmission? it does in the rb20 transmission.

[Valley]

negative. KA is about 2 inches to short to fit in the rb25.

[lucky7]

picking up my cluster tomorrow. sending it in soon hopefully.

[Darius]

I bought a tach signal modifier from Dakota digital and OMG you guys would not believe how easy it is to install. I think it cost me about $70 but I hooked it up, set it to 6 cyl engine for a 4 cyl gauge and the gauge shows the motor idling at about 600 rpm. The speedo modifier is going to be a little bit more to wire (not much), but I'll let you know when I get it finished Sunday. Seriously soo easy and the gauges look and fit stock. Can't beat that. ok maybe you can

[lucky7]

i thought the speedo was fine in an RB25?

[Bluefire]

Speedo reads slow with the RB25... Also fyi s14 tachs have enough range of adjustment to adjust to 6 cylinders. I used a timing gun and matched the tach to that. No need to send it in to ls auto. As for the s13 there is not enough adjustment. The pot on the back needs a higher range of resistance. But all you need to do to make it work is increase the resistance and you will be in range to make the s13 tach work.

As for the speedo, I have yet to test it. But looking at the s13 speedo, it also has a pot on the back which can be adjusted to calibrate the speedo. And seeing as how the speedo reads slow, I would assume the resistance needs to be lowered. I will soon be testing the stock speedo and also a jdm s13 speedo (180 mph speedo ) As for the s14, it does not have any stock adjustment as far as I can see so I don't know about that.

-Bluefire

[blk90s13]

import intelligence calibrate tachs as well

[lucky7]

Quote »" Kevin Wells to me More options 3:28 am (11 hours ago)

We can help you. first we will need your cluster to calibrate the tach two 6 cylinder. On the speedo the sending unit on the rb and S14 are the same pulses per revolution if you have the big rb25 transmission. you can tell the difference by the output shaft size if it is a larger shaft then the sr or ka trans then you are fine.

Hope this helps

ThanksKevin"[/quote]what is this guy talking about then?? i want all my gauges to read CORRECTLY. this is becomming a headache.

[eh?]

Speedo reads slow with the RB25...

-Bluefire

What do you mean it reads slow? Mine reads correct.

[Bluefire]

Mine reads like 30mph when im going like 60mph with RB25 speed sensor

-Bluefire

[lucky7]

ive got it all figured out now. you need a Ka speed sensor so it will read correctly. rb speed sensor = kph.

thats what i have to find, a ka speed sensor. dont have one because i bought a rolling chassis. got my tach. ill probably ship it monday to ls auto.

[David_NISMO]

Can anyone else verify this? My Speedo is reading half, If I swap out speed sensors will it fix it?

[Bluefire]

The RB25 speedo is longer than the ka speedo so I don't think the ka speedo will work

-BLuefire

[lucky7]

speedo longer?? when you do an Sr swap, you use the Ka speed sensor. same thing from what i was told.

[Bluefire]

Yes KA and SR trannys are very similar which is why you can swap them. The RB25 transmission is much different. The physical length of the sensor in the RB25 is much longer than that of the ka or sr

-Bluefire

[lucky7]

so what do you suggest to get the speedo corrected?

[Bluefire]

simplest way would be to buy a converter. At least this way you can adjust for different gearing also.

-Bluefire

[Darius]

Refer to my previous post in this thread.

[Valley]

to my understanding with the sr swap if you use the jdm cluster you need to add a resistor to get it to read right, its not the sensor that reads different but the cluster that interprets it differently.

as stated, if you want the "easiest" most reliable way to get mph. get a converter.

[eh?]

Do you have a S13?I believe s13/rb25's read incorrectly while S14/rb25's read correct.

[lucky7]

that too is what ive heard/read.

i have an S14. hoping this will be fine with the Ka speed sensor i just bought.

[Valley]

that too is what ive heard/read.

i have an S14. hoping this will be fine with the Ka speed sensor i just bought.

the s14 speed sensor is the same size as the s13 right? since the s13 speed sensor is to short what makes you think the s14 will work?

[kouki-gymkhana]

No, no, no...The sensor is the RB25 transmission sensor which will be the same no matter what chassis you swap it into. The problem is at the cluster. Apparently, the s14 cluster speedo will read correctly but the s13 speedo only reads about 1/2 of the true speed. So, either way, you need the RB speed sensor...the KA one will not work in the RB25 transmission.

[Bluefire]

s14 rb25 speedo does not read correctly either. I've done two and both read slow just like the s13. Speed sensor is also the same for s13/s14/ka/sr... except different plug. So as far as I can see the only speed sensor that will work in the RB25 transmission is the RB25 speed sensor.

Also I tried the jdm s13 speedometer in my ka cluster and it freakin read just as slow. I was hoping it might be a little closer, but no dice. Also a weird thing I noticed with the pot on both usdm and jdm s13 tachs. It jumps from ohms to kilo ohms with a slight adjusment, almost seems exponential, unlike s14 tachs which seem more linear. I know if I can get just one more day to touch my car I can get this all figured out.

-Bluefire