Idle rpm with KA tach?

[cvc9216]

I just got my car running, but I think it idles a little high. Can someone tell me what the RB idles at with the stock KA tach? Mine is right at 2000rpm. I think my welds on the IC piping may be leaking, it seems to run fine otherwise though.

[Joe]

hmm..with the KA tach it should read LOWER by about 1/3. so it should idle 500ish.

2000 it not an idle, thats a ginormous vacuum leak if its really at 2000.

[PROJECTRB240SX]

I THOUGHT A 4-CYL TACH WILL READ HIGHER BECAUSE OF THE EXTRA PULSES?

WELL THE MOTOR SHOULD BE IDLING ANYWHERE FROM 650 TO 750 AT THE MOST ON A 6 CYL TACH.

[frosted flakes]

hey,

it reads 1.5x HIGHER....i have my tach hooked up and it defintley reads 1.5x HIGHER because of the extra pulses...6/4 = 3/2 = 1.5

But idle i ususally idle about 1,100rpm that reads on the tach (about 750 actual rpm)

Tony

[NISMO_RB25]

my KA tach read higher, in fact I think it probably was around 2k at idle.

There is a thread about what I did to fix it. (I used a 6 cylinder tach from an infiniti)

[PROJECTRB240SX]

WHATS THE NAME OF THAT THREAD NISMO? I CAN'T FIND IT.

[93RPS13]

my KA tach read higher, in fact I think it probably was around 2k at idle.

There is a thread about what I did to fix it. (I used a 6 cylinder tach from an infiniti)

which infiniti tach? thanks

[PROJECTRB240SX]

WAS IT AN INFINITI OR WAS IT THE STAZA THAT YOU SAID IN YOUR POST?

I FOUND IT BTW

[NISMO_RB25]

Your right it was a stanza:

Tach fix for the RB25DET In my quest to make my gauge cluster read correctly (I am using the KA cluster with my RB25DET), I have found something that will hopefully help the rest of you guys.

Nissan was apparently was nice enough to use the same pattern for their Tach and speedometer in other cars. What this means is that I was able to pull the tach from a 1989 Nissan Stanza V6. At least I think it was a Stanza, but it could have been something else(the junkyard was not kind to it).

Anyway it works, it was about 200 RPM to high, but it had plenty of adjustment to fix that problem.

Quick how to.

1. pull out both Tachs. (it is a wopping 3 screws, after you finally get the cluster out of the dash)

2. pull the needle off of both tachs.

3. Now you can remove the 2 screws that hold the face on.

4. Remove the face, and the plastic backing. (This is the part where you need to remember which tach was from the Stanza and which one was from the 240)

5. Now put the plastic backing, gauge face, needle from the 240 cluster on to the stanza tach.

6. tighten up the 2 front screws

7. put it back into your 240 cluster and you are done.

8. The Tach has an adjustment on it, if yours happens to be a little off. you will need to turn it to the left to increase the RPM readout, right decreases it. I turned mine a little to the right and it works perfectly now. (I used my Apexi RSM to verify it was working correctly)

I haven't tried the speedo yet, but if I can get that to work correctly, I will let you know.

[eh?]

I don't the stanza ever came with a V6. Maybe it was a maxima?

[fly240]

hey kamin, do you use a stock ka tech for your rb. With the ka tech, my is setting at 2000rpm, but aftter i drive around for 30 minutes and shut it off, turn it back on, it idle at around 1000.

[NISMO_RB25]

I don't the stanza ever came with a V6. Maybe it was a maxima?

I will have to check the junkyard next time I am there. You have to be right, because I can't find anything about a v6 stanza. I could have sworn that was what it was, but i guess I must be wrong.

[goofynick6]

Aww man, even with all my research, I somehow never realized my tach would be off in my s14 after the rb20 goes in...hmm. I wish there was an easy way to fix it...is there a recalibrator that can be installed? I don't want an aftermarket tach, and the Stanza tach won't look right with my gauges. Thanks,

Nick

[goofynick6]

Bump