I got everything hooked up for my TypeS IM swap but for some reason the IMRC opens correctly but then it looks like it gets stuck when it tries to close. I have the rpm switch set to open the IMRC at 3500 rpms, which it does. The close setting is set at 8000 rpms, which basically means as soon as the rpms drop below 3500, it is supposed to close.

What happens is the IMRC gets stuck in the open position. If I manually grab the gear on the IMRC and turn it, it will close. I have to give it a little tug because there is some resistance on it. Once I do that though, it spins freely. It feels like it still thinks it's supposed to be open.

I've tried testing it with the IM cable disconnected from the IMRC so it's not an issue with it being too tight or too loose.

It's wired correctly:

1. Yellow to the left contact on the IMRC
2. Red wire from the right contact to positive on the battery (yeah I'll find a permanent place for it later)
3. Black wire from the rpm switch to ground
4. Red wire from the rpm switch to positive on the battery
5. White wire on the rpm switch to the rpm test plug near the horn
6. Gray wire on rpm switch not used

I get the accurate rpm reading on the rpm switch so it's definitely getting the rpm signal. It just seems like it doesn't know to close.

Anyone have any ideas? Oh and the rpm switch and IMRC are brand new.

 

You have to play with the two nuts that are connected to the cable.



See the silver metal part...there are two nuts sitting behind there and they need to be perfectly set up or the cable will get stuck every time.

 

that's just it. I disconnected that cable completely and it does the same thing.

 

Ok...i'll eat my words.

The butterfly will stay open just a tad bit when it's "closed".

I'm assuming that's what you are talking about.

 

No, the problem is the IMRC appears to stay open even when the rpms drop below 3500. If I grab the IMRC gear (the part the cable connect to) and try to give a turn, it seems like it's stuck. If I push a little harder, it turns, then it turns freely.

 

I can see it open when the rpms hit 3500, but it doesn't close when it drops below 3500.

 

Still having this problem. Anyone have any other ideas?

 

No but I am interested in this, First off what is a IMRC? And what are we doing Hear/ What does this do for our car's? Thank's

 

What is it: It opens the butterfly on the TypeS IM.
What am I doing: retrofit TypeS IM on a non-TypeS
What does it do: more power for non-typeS owners

 

I think I might have this issue on my S. Would it throw a code if it stayed open all the time? I remember when I was putting on my CAI the butterfly was open I think. What would happen if it were open all the time would the car run badly?

 

Appreciated I got a Type S so useless to me Thank's

 

You need to adjust the cable nuts like BigLizard was saying. At least that is what I did. I dont think taking the cable off will help troubleshoot the issue as the tension from the cable is what helps close it. You may want to troubleshoot the RPM switch as well and just apply a straight 12 volts to both pins. That should open it, when you unhook it should stay open untill you apply some tension to the cable. let me know if that doesnt work and I will mess around with mine a bit and see if I can get it to do the same thing.

Are you using an MSD RPM switch? if so which one? The ones with the interchangeable modules or the one you can program with buttons?

 

Alright. Now we're getting somewhere. Didn't realize the spring on the butterfly actually made it close.

Yeah I'm using the MSD that you program, same as BigLizard. Gonna give it a try.

Thanks for the help.

Neil

 

Also, I just re-read my post and realized I made a mistake. When I was talking about troubleshooting using straight 12 volts I was referring to the IMRC and not the RPM switch. I'll try to get mine to act up again this weekend so I can let you know which way to adjust. Let me know if you get it working before then.

 

Thanks dshearon. Appreciate the help.

 

Not entirely useless. Many folks have had issues with their IMRC's which led to dramatic losses in HP. It's good to pay attention.

 

im not sure if im not thinking about it the right way , but why would u set it to close at 8k?

 

Good point, I missed that in the beginning. Is the open setting for "above a RPM" and the close setting for "under a RPM"? In that case they should both be set at 3500.

 

I just ran out and checked mine. I have "on" set to 3800 and "off" set to 3100.

 

Any luck before I pull the engine cover off?

 

Thanks man, I just haven't had time to look at anything on my car.

 

was this ever resolved? looking into doing this mod for my 99

 

is this the switch http://dagostinoracing.com/index.php...oducts_id=5951

 

and i will need a module as well?

 

talk about post after post. just go back and edit the original one, u have 5min to do so.

 

https://acurazine.com/forums/2g-cl-frequently-asked-questions-52/type-s-intake-manifold-cl-p-discussion-thread-486697/

 

Thanks big lizard

 

Still not working. Went and bought a new IMRC and tried that and it does the same thing.

The spring on the IM will not close the IMRC. I have to turn the gear on the IMRC pretty hard to get it to close. If I hold the IMRC in my hand I can feel it try to turn when the rpms go under 3500 but it just doesn't close. And again I've tried a brand new IMRC as well as my current one.

It's like it's not processing the close signal.

Just confirming...

I have it set to open at 3500rpms (yes this is right for a TLP) and set to close at 3100rpms.

Correct?

 

So I called MSD and they think I should be using relay to control the IMRC. Gonna go pick up a cheap one at Autozone tonight.

Question, is the IMRC controling voltage or ground? I believe it's voltage.

 

Take that top plate off , when I was puttining on my im spacers i cleaned out my IM and it was all tar stuff up where the plates open,.. Maybee there stuck too much sh()T up in there!

 

You don't need a relay. The switch works just fine. The IMRC gets a little bit of voltage so the gears will open.

The reason it's becoming stuck open is because of those two notoroious nuts that are close to the IMRC gears. You have to keep playing with them until it's letting the cable open AND close. If the nuts are too tight they'll keep on the IMRC plates open, but it won't let off the pressure, therefore it won't close the plates.

 

Did you test the motor control box? Its on the driver side kick panel, it has 5 wires going into it.

 

8000 rpm ? i belive not in a CL

 

NSXNext is not a Type-S

 

I realize some have not used a relay but after talking to MSD and they are pretty sure the issue I'm having is a result of the lack of a relay.

The spring tension on the IM plate will never close this. I have to grab the IMRC gear with my hand and turn it pretty hard to get it to release.

 

Ahhh, I just reread the post. Got it.

 

I don't then. I never had issues with the MSD switch and the IMRC together. There are a few others that have done this too. Even the guys over at the unmentionable website have made this mod work when they popped in a Type-S engine.

 

Where exactaly are you guys getting your tach signal from ?
I mounted the IMRC and rpm switch, now to the wiring.

 

Ever got this to work I have the same issue and it just stays open

PICS of said nuts you are adjusting.
I can't cant it to release either using 2 differnt switches.
I think I'm going to try to tighten the butterfly spring if possible

 

When it activates and you let off to where it should close, is there still voltage coming from the RPM switch?