240sx techno calibrated to work with RB

[93RPS13]

http://www.lsauto.com has a tachnometer that fits the 240sx cluster and works with the RB... check it out

[mambastu]

Not sure how necessary it is to buy another tacho tbh.

I've been fiddling with the tacho on my 91 eurospec S13 today. Managed to get it to read correctly by following GTRShops advice on another thread.

I fitted a 10k resistor between the ign and signal screws on the circuitboard on the back of the tacho. The tacho then started reading the signal from the ECU and was approximately double the actual figure. Removed the tacho from the cluster and adjusted the variable resistor (accessible from the back of the tacho) anticlockwise as far as it goes.

Put it all back together and its now pretty accurate, probably more accurate than it was originally with the CA

Just got to sort the speedo out now

[93RPS13]

so it does work?...

[mambastu]

so it does work?...

Yes

[dekand]

cool stuff

[NISMO_RB25]

Just got to sort the speedo out now

They have a 180mph speedo on that site as well. I don't know much about these guys, but that really isn't that bad if it works.

[xjon]

either way, I'm always searching for sites that has RB products. Thanks.

Anybody ever dealt with them? I'll do a search on the SR forums. Seems like they have been dealing with sr's for a long time.

[GTR Shop]

HAHA! told ya it works!!!! Tricks of the trade aye...

[mambastu]

HAHA! told ya it works!!!! Tricks of the trade aye...

Yeah, thanks a lot Matt

Now....if you've got any suggestions for the speedo......

[DETurbine]

Not sure how necessary it is to buy another tacho tbh.

I've been fiddling with the tacho on my 91 eurospec S13 today. Managed to get it to read correctly by following GTRShops advice on another thread.

I fitted a 10k resistor between the ign and signal screws on the circuitboard on the back of the tacho. The tacho then started reading the signal from the ECU and was approximately double the actual figure. Removed the tacho from the cluster and adjusted the variable resistor (accessible from the back of the tacho) anticlockwise as far as it goes.

Put it all back together and its now pretty accurate, probably more accurate than it was originally with the CA

Just got to sort the speedo out now

I just did it to mine last night and it works perfectly. Keep in mind that you need to use the DOHC cluster and you need to turn the variable resistor clockwise as far as it will go not counter-clockwise.......it is pretty dead on and is only $0.20 for the 1/2 watt 10k ohm resistor that you can pick up at any radioshack.

All I have to say is screw McKinney and LSAutomotive for trying and selling them for $100.....when you can do it for $0.20 and takes 20min to take out, do, and then put back in.

[BoostFab]

I just did it to mine last night and it works perfectly. Keep in mind that you need to use the DOHC cluster and you need to turn the variable resistor clockwise as far as it will go not counter-clockwise.......it is pretty dead on and is only $0.20 for the 1/2 watt 10k ohm resistor that you can pick up at any radioshack.

All I have to say is screw McKinney and LSAutomotive for trying and selling them for $100.....when you can do it for $0.20 and takes 20min to take out, do, and then put back in.

you got a part# for radio shack? possibly post a pic or 2

[goofynick6]

I thought it would only be accurate in lower rpms, and as they increased, accuracy would decrease?

Does this work on the s14?

Nick

[DETurbine]

You will not need a picture for the resistor, RadioShack should only carry one of them. Just go there and get the 1/2 watt 10k ohm resistor.

For the tach being accurate, I can tell you know it is with low and high rpm's. It idles at 5-600rpms like it should and redlines just a little above 7k like it should. It will work on the s14 as well. All you need is the dohc cluster and it will work.

[Wulfgang]

You don't need a resistor with the S14. It already reads without it.

[goofynick6]

Yeah, I think it'll be accurate for some of the range, but something that thinks it is getting a 4 cyl. pulse is gonna be wrong with 6 cyls. pulsing into it.

NIck

[dareo]

Can't you just remove the 240sx tach and replace it with a 6 cylinder DOHC nissan tach from a 300zx or maxima? I know i read that somewhere, on the internet even, so it has to be true!

[NISMO_RB25]

Can't you just remove the 240sx tach and replace it with a 6 cylinder DOHC nissan tach from a 300zx or maxima? I know i read that somewhere, on the internet even, so it has to be true!

a tach from a v6 maxima works and is what I am using right now (verified it with my apexi Rev/speed)

I am waiting on some new gauge faces and I think I will have a fix for the speedo and tach (on S13 with RB25) all sorted out. I should know in a week or so and the Total cost in parts will be about $70 if it works. I will do a writeup and let everyone know where I got the parts.

NOTE: I don't sell stuff so I will just be telling you where/how to get the parts and how to do it. Also if it works, one of the places is a sponsor

[goofynick6]

Yeah, I want a properly working tach in my s14 cluster, but I don't want it mismatched..ya know?

Nick

[NISMO_RB25]

you are probably going to have to experiment.

[goofynick6]

I have a plan...I'll let you know how it goes over the next few weeks..

[frosted flakes]

u actually turn the variable resistor CLOCKWISE to get it to read right. I just tried this and now my tach is reading PERFECTLY!

[goofynick6]

Perfectly throughout the whole rev range? Can you compare with a rev/speed meter to verify?

Nick

[frosted flakes]

it seems pretty accurate @ idle.

I am installing a bunch of electronics right now, apexi s-afc2, apexi turbo timer, and pivot headlight controller.

The apexi s-afc2 has a tachometer accurate down to 1rpm so I wil check my tach against the apexi electronic tach and see the difference...i will hopefully be able to verify sometime tommarrow (tuesday)

[93RPS13]

nice

[frosted flakes]

I just checked the accuracy of the tach with the variable resistor turned fully clockwise.

When my tach reads:-900rpm(idle) the actual rpm is 850rpm (from the apexi s-afc2) -3,000rpm the actual rpm 2,850rpm

I did not rev it up anyhigher because it is in my garage but the tach with the calibration is pretty accurate now, with the resistor turned fully CLOCKWISE.

[goofynick6]

Are you going to solder in the new 10k resistor or whatever like mentioned above?

[NISMO_RB25]

I just checked the accuracy of the tach with the variable resistor turned fully clockwise.

When my tach reads:-900rpm(idle) the actual rpm is 850rpm (from the apexi s-afc2) -3,000rpm the actual rpm 2,850rpm

I did not rev it up anyhigher because it is in my garage but the tach with the calibration is pretty accurate now, with the resistor turned fully CLOCKWISE.

It gets really off once you start getting in to the higher RPM's. Check it at about 5grand and you will see what I mean.I got all excited when I had it reading right between 0-3K, but once you go to 5 your gauge will probably read 7.

[frosted flakes]

i checked it last night and when my tach reads 7,000rpm its about 6,200rpm actual...not that bad...

[GTR Shop]

You can get it pretty close.. we calibrate at 5000rpm.

[accel junky]

I sent my SOHC cluster to LSAUTO. They said they could rework the tach and put in the 180mph speedo for use with rb25. I'll let you know how that goes.