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Apexi RSM: Installation Question

benm

By benm,
in General Automotive Discussion

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benm Grand Master

benm

Posted
Posted

Just curious... for the people with the new style RSM (blue screen) does the actual RSM need to be plugged in for the car to work (like can the car/ecu still work 100% with the RSM plugged in).

The RSM has a permanently connected cable which has a plug at the end of a 2ft cable. Their is then another plug with another 2ft of cable which is what actually connects to the ECU wires. If I was to connect it all up but then disconnect the RSM would everything still work or would it leave some of the loops open?

Are you confused? I'm not far off it... :)

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strutto Grand Master

strutto

Posted
Posted

I think you may find that the speed signal doesn't get "passed" on to the ECU...

In my experience, the speed sender on the gearbox passes the signal to the dash cluster... This drives the speedo... The signal is then passed on to the ECU...

The RSM intercepts the signal between the dash and the ECU...

There are two methods of wiring the RSM IIRC... One where the signal is intercepted and the speed cut can be changed... And one where the signal is tapped and the speed cut remains factory...

I'm unsure what happens when the speed signal doesn't get passed to the ECU? Perhaps those who have cut wire 53 will be able to elaborate on the effects of having no speed signal to the ECU...

All the other wires should be fine...

Birnie Veteran

Birnie

Posted
Posted

i agree, the only problem would be the speed signal as the rest only tap in to what the ECU sees whethere the RSM is there or not. ie, the speed wire is acually cut and runs thru the RSP and then to the ECU.

I can't see this being a problem though if the ECU doen't get the speed signal.

Because it must be altering it or removing it altogether for the car to work over 180km/h.

If you are still worried about it, wire it the alternate way which only taps into the wire without doing the speed cut. Then it would DEFINATELY work plugeed in or not.

I've got one so i guess i should unplug it and give it ago but i'm stuck at work now for 12 hrs :)

benm Grand Master

benm

Posted
  • Author
Posted

Edited again....

What im trying to do is have it so that i can disconnect the RSM 'while' im at work (to try and help prevent theft etc). So when im driving i'll -always- have the RSM connected. I was just thinking that by connecting <-> disconnecting the RSM it might muck up the ECU or speedo or something while the car is sitting there off.

Birnie Veteran

Birnie

Posted
Posted

Should be no problem at all to disconnect when nt running I'd say.

Won't affect anything.

But anyway...what i do is a couple of matching velcro sticky strips.

One on the RSM and one on the dash in front of the standard speed dial.

Just enought room to see kms,boost and fuel...perfect!

The everytime i park, just 'rip' it off and place it under the dash where the pdeals are.

Sort of a reverse type shelf there and balances there fine.

benm Grand Master

benm

Posted
  • Author
Posted

Well I plugged it all in and it switches on etc and is working but the only problem is the wire that im sposed to splice for the 'revs' does not exist on my harness, its empty???

Has anyone here installed 1 on an RB25DET recently?

Birnie Veteran

Birnie

Posted
Posted

Yep, did mine myself (and my brother) and if it's blank, your not reading it right.

We read everything quite a few times and made notes on colors positions of wires etc....

Did it all once and switched it on...

First thing we tried was Revs and all worked fine.

Maybe you're reading the wrong ECU diagram but it's definatley correct

Or maybe you've got it upside down but i doubt that as you've got the power working..

Good luck :P

benm Grand Master

benm

Posted
  • Author
Posted

Well the English (USA) is a different diagram number but their is only 1 - 16P-20P-20P harness in the entire Nissan section and its for RB25DE/RB25DET. In the Jap book it came with its a diff diagram numb but the same picture.

I'll have a look at it again this afternoon (in the daylight :P )

benm Grand Master

benm

Posted
  • Author
Posted

Can anyone tell me what colour their 'speed' wire is on the ECU harness? I have no issues getting power to the RSM but cannot for the life of me get a speed signal.

I have a '95 R33 GTS-t Series 1

benm Grand Master

benm

Posted
  • Author
Posted

Ok still trying to figure out this stupid thing.

Attached is a pic showing that I do not have a Rev output wire like shown in every single manual I've read. Are their any other wires nearby that I can connect the Rev wire too?

ecu-harness.jpg

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