How to test NVCS?

[sidewaymambo]

I have done a search, but nothing for it, just wondering how to test the NVCS, and what happen if it does not work? I suspect that mine does not function correctly, thanks

[Jetdat]

hmmmm , what are the symptoms??

[Zman]

Whats NVSC?

[sidewaymambo]

since I have a major upgrade, I am not sure the NVCS still works, is anyway to find out? cheers

[Steve]

If you unplug the NVCS, you should notice the difference when you are driving. It comes on around 1200rpm and cuts out at around 4200 from memory on an R33 - so you lower/midrange will feel alot more sluggish.

The best way would be to put the car on a dyno and look at the power curves with it plugged in and without.

[Steve]

Zman, NVCS is the variable cam timing on the inlet side only on R33, but I think R34 has both inlet and exhaust.

Phillip, also if you had an adjustable inlet cam gear fitted, you NVCS wont work.

[sidewaymambo]

Hi, Steve

I won't have dyno access till some time next month, so I may try to drive with the NVCS plug in or out, where should I look at for the NVCS plug? I will unplug it and drive to see if I can pick up the difference..

I keep the stock cam gear (but with tomei 264 shaft).

thanks

Originally posted by Steve

If you unplug the NVCS, you should notice the difference when you are driving.  It comes on around 1200rpm and cuts out at around 4200 from memory on an R33 - so you lower/midrange will feel alot more sluggish.

The best way would be to put the car on a dyno and look at the power curves with it plugged in and without.

[Steve]

NVCS plug is at the front of the engine, on the inlet side near the top of the rocker cover. Sorry I cant find my digi camera at the moment, my 3YO boy likes hiding things:)

[dojobi]

When I had mine unplugged, I struggled to make 130rwkw on the dyno, which to me indicates that you lose the top end when it's out. It just gave me a very early peaking and flat power curve. Plugging it back in fixed everything up though.

[Penfold]

does an r33 gtr have NVCS?

[Emre]

None of the GTRs have variable cam timing.

[Penfold]

sweet

[Guest INASNT]

Steve

I am preety sure the NVAC kicks in from 5000rpm all the way to redline, which is the thing that gives u the nice push back in your seat at high revs.

Sidewaymambo

If u put new intake cams in you might have disabled the NVAC, but with the Tomei procams they are still meant to retain it.

Even if it has disabled it with 264 duration cams u should feel more power and torque through the midrange coz the stock cams are only 256 duration.

[Steve]

INASNT, check out this link:

http://www.tomei-p.co.jp/_2003web-catalogu...haft-specs.html

[sidewaymambo]

I have the 264 @ intake and keep the stock cam gear, i will try this weekend.

[Jetdat]

it is designed to give more torque at lower revs as most turbo engines have lower compression and have relatively retarded ignition timing to compensate for the turbo boost, thus reducing lag.

therefore it should come in early in the rev range and cut out around when the turbo kicks in.

[Guest INASNT]

Originally posted by Steve

INASNT, check out this link:

http://www.tomei-p.co.jp/_2003web-catalogu...haft-specs.html

hmm then whats the variable valve timing that kicks in at 5000rpm called then?

[sidewaymambo]

Originally posted by INASNT

hmm then whats the variable valve timing that kicks in at 5000rpm called then?

I don't think my skyline got one? only heard it from honda..VTEC?