RB25 NVCS Plug

[judasentinel]

I dont have NVCS hooked up, as I'm using an RB20 ECU with Nistune to run it.

But now I think it would be a good idea to hook up the NVCS. I can hardwire it, but perhaps a plug would be better. Does anyone know where I can find the plug that connects to the NVCS solenoid? I heard some time ago that it is the same as a plug from the harness of a 240SX (dont remember if it was S13 or S14). Anyone have an idea and where I can get it?

If no plugs are compatible, in what other way(s) can I hook up the NVCS?

Thanks.

[Skym]

Not sure if the Camcom VVT-i controller (designed for Toyota's, etc) might work -

http://www.raceindustry.com/part-showcase/power-enterprise/3153-camcom-cc-101.html

http://www.powerenterpriseusa.net/products/electric/camcon/camcon.htm

Or could just piggy back a Greedy V-manage with a harness to control NVCS only -

http://www.nengun.com/trust-greddy/greddy-v-manage

[judasentinel]

No Skym, I dont want to control NVCS as such. I just want to know where to get the plug for the NVCS and to hook it up directly to the battery (12V). Anyone know what kind of a plug it is, where to get it and what it looks like? That's all.

[kdwebber]

I know which plug the nvcs is. I will take some pictures of mine in the next few days and post them on here.

What harness are you running? if you are running the rb20 harness then you will have to run wiring for the plug yourself and then solder it into your ecu.

I will have pictures and the location on the ecu for the plug in the next few days

Kyle

[kdwebber]

my buddy Tagurit found this for me so I'll give him credit for it..

the VVT wire signal to pin 113 and the return wire to pin 109



that is a picture of the sensor on the wiring harness/engine

Hope that helps

[judasentinel]

thanks a lot, kyle. I just wanted to know if that plug is compatible with plugs from another car or component. I couldn't find it.

And I cannot connect NVCS to the ECU because I am using RB20 ECU. I had to manually make a plug and connect it to a 12v power supply.

As soon as I connect the NVCS, the revs on the car drop. And there is severe lack of power when it is on. What is going on?

I thought NVCS would allow me to gain more power but it seems to bog down much quicker and sooner than before.

Does ANYONE actually know how NVCS helps? I know it does something to thetiming of the intake valve opening, but what is that something? Does it have an effect on ignition timing as well?

My car runs much better with the NVCS not hooked up. To know that there is even more potential to be exploited by the NVCS working and actually finding that it is robbing me of power makes me wonder how I can achieve that. Does it need a 12v source or a 5v source?

Guys help me out here. This is the last piece of the puzzle that started more than 2 years ago and its still not running 100%.

[RSi]

How about a RPM activated switch....

Or better yet... a proper R33 computer.

R32 ECU on a RB25DET = uke:

[RSi]

The chip you are using is probably tuned for no NVCS... that will be why its bogging.

thanks a lot, kyle. I just wanted to know if that plug is compatible with plugs from another car or component. I couldn't find it.

And I cannot connect NVCS to the ECU because I am using RB20 ECU. I had to manually make a plug and connect it to a 12v power supply.

As soon as I connect the NVCS, the revs on the car drop. And there is severe lack of power when it is on. What is going on?

I thought NVCS would allow me to gain more power but it seems to bog down much quicker and sooner than before.

Does ANYONE actually know how NVCS helps? I know it does something to thetiming of the intake valve opening, but what is that something? Does it have an effect on ignition timing as well?

My car runs much better with the NVCS not hooked up. To know that there is even more potential to be exploited by the NVCS working and actually finding that it is robbing me of power makes me wonder how I can achieve that. Does it need a 12v source or a 5v source?

Guys help me out here. This is the last piece of the puzzle that started more than 2 years ago and its still not running 100%.

[judasentinel]

Thanks for the replies. A few clarifications:

1. I am not using a chip in my ECU. I have Nistune, so I can change all the maps as I want on the ECU.

2. When I hook up the NVCS, my revs drop. Is thatg how its supposed to be? I am assuming that revs drop because the timing drops retards when NVCS gets connected. Is that correct? Should the revs drop when NVCS kicks in?

3. I drive around with the NVCS disconnected and the car is very responsive. When I do the same with the NVCS connected, the responsiveness seems compromised. And I am hitting a longer and more steady flat spot with no power at all earlier on in the rev range. Previously, I would hit a flat spot around 6000+ rpm. Now it is at 4500-5000 rpm and then it persists. My afr doesn't change on the wideband from one condition to the next (NVCS on vs. not on). So why is the bogging and flat spot occurring? It does not seem to be related to air or fuel. Is it related to ignition timing? Should I advance the idle ignition timing? Before NVCS, it was at 15 degrees BTDC. What should it be if I have NVCS hooked up?

Thanks.......

[RSi]

Nistune or eprom, you are using an R32 basemap though, so it is still uke:

The ECU was never designed or coded to run NVCS. When its connected it would be like WTF!

Simple answer - if it bogs with it connected, keep it disconnected.

OR: connect it, and retune your nistune to cope with it being there 24/7

OR: do it properly, and chip an R33 ECU.

Thanks for the replies. A few clarifications:

1. I am not using a chip in my ECU. I have Nistune, so I can change all the maps as I want on the ECU.

2. When I hook up the NVCS, my revs drop. Is thatg how its supposed to be? I am assuming that revs drop because the timing drops retards when NVCS gets connected. Is that correct? Should the revs drop when NVCS kicks in?

3. I drive around with the NVCS disconnected and the car is very responsive. When I do the same with the NVCS connected, the responsiveness seems compromised. And I am hitting a longer and more steady flat spot with no power at all earlier on in the rev range. Previously, I would hit a flat spot around 6000+ rpm. Now it is at 4500-5000 rpm and then it persists. My afr doesn't change on the wideband from one condition to the next (NVCS on vs. not on). So why is the bogging and flat spot occurring? It does not seem to be related to air or fuel. Is it related to ignition timing? Should I advance the idle ignition timing? Before NVCS, it was at 15 degrees BTDC. What should it be if I have NVCS hooked up?

Thanks.......

[judasentinel]

I am using R33 base map, not R32.

The main question is, WHAT does NVCS do? And what does the ECU think of it? I understand the WTF comment, lol, but how is the ECU gaining this info?

I am going to try and tune with Nistune, but which part? I dont know if there is a need to retune, because I dont know what NVCS is doing to the afr and ignition timing. My afrs dont change with or without NVCS. The only change I notice is a drop in revs (a few hundred rpms).

This is news to me that now you can chip an R33 ECU. All along, I have known that people have tried and generally failed to chip the 16 bit R33 ECU. Only 8 bit R32 ECUs were chipped with success, but then I could be wrong.

Do you or anyone else know the effect on afr and ignition of NVCS? Does it actually have an impact? Or is it unrelated? From what I know, NVCS when connected, lets the intake valves open a bit longer, which means more air and fuel can get in, but then the injector pulse width needs to change to get benefit from it, doesn't it? Or is it something totally different? If only I can understand the full working of the NVCS, can I make changes to the tune on an ECU. Not without it.

No one seems to have a clear-cut answer to its functioning, and that is frustrating because I feel lost .

[Skym]

R33 RB25DET NVCS range is in this link below -

http://www.tomei-p.co.jp/_2003web-catalogue/e090_camshaft-specs.html

Tomei has a section on valve timing, which shows a midrange drop on a graph -

http://www.tomei-p.co.jp/_2003web-catalogue/e066-068_camshaft.html

You can retune a R33 ECU, but requires what is said to be a $1000 or so daugther board. Then I think you use Nistune, etc to retune.

[RSi]

You are using R33 maps, on a R32 BASE. You have it plugged in to a R32 ECU, so all it undertands is R32 talk, not the R33 NVCS.

Yes the R33 can be chipped. I do it regularly.

I am using R33 base map, not R32.

The main question is, WHAT does NVCS do? And what does the ECU think of it? I understand the WTF comment, lol, but how is the ECU gaining this info?

I am going to try and tune with Nistune, but which part? I dont know if there is a need to retune, because I dont know what NVCS is doing to the afr and ignition timing. My afrs dont change with or without NVCS. The only change I notice is a drop in revs (a few hundred rpms).

This is news to me that now you can chip an R33 ECU. All along, I have known that people have tried and generally failed to chip the 16 bit R33 ECU. Only 8 bit R32 ECUs were chipped with success, but then I could be wrong.

Do you or anyone else know the effect on afr and ignition of NVCS? Does it actually have an impact? Or is it unrelated? From what I know, NVCS when connected, lets the intake valves open a bit longer, which means more air and fuel can get in, but then the injector pulse width needs to change to get benefit from it, doesn't it? Or is it something totally different? If only I can understand the full working of the NVCS, can I make changes to the tune on an ECU. Not without it.

No one seems to have a clear-cut answer to its functioning, and that is frustrating because I feel lost .

[RSi]

If you just want to chip it, you don't need a daughterboard. Just a 84pin PLCC

R33 RB25DET NVCS range is in this link below -

http://www.tomei-p.co.jp/_2003web-catalogue/e090_camshaft-specs.html

Tomei has a section on valve timing, which shows a midrange drop on a graph -

http://www.tomei-p.co.jp/_2003web-catalogue/e066-068_camshaft.html

You can retune a R33 ECU, but requires what is said to be a $1000 or so daugther board. Then I think you use Nistune, etc to retune.

[judasentinel]

You are using R33 maps, on a R32 BASE. You have it plugged in to a R32 ECU, so all it undertands is R32 talk, not the R33 NVCS.

Yes the R33 can be chipped. I do it regularly.

Where were you all my life? Man, EVERYONE around here has been saying that you simply cannot chip it.

I totally understand that my ECU is thinking that I am still running an R32 engine. To my ECU, its just an RB20DET with 500 cc more displacement.

The thing is that I want to understand the impact on the working of the engine when NVCS kicks in. Even if the ECU goes WTF when NVCS is on, it should still be able to work with the change in the intake valve timing by altering the afrs and timing maps, shouldn't it?

When people say that NVCS can help you make more power, what rpm range does that refer to? And how can you make more power - by increaing boost in the NVCS rev range? If that is the case, then NVCS is useless to me until 3800 rpm, because until then I am nomt making positive boost. My big ass turbo starts to make boost at around 3800 rpm and then hits full boost at around 5000 rpm. SO maybe I need to have a TIMED/RPM activatred switch. Any ideas how to do that?