Quick Question R33 Gtr Does It Have Vtc?

[Badgaz]

Just wondering if the r33 gtr motors have variable inlet cam timing?

[zebra]

No

[Ben C34]

None of the rb26s has vct.

Rev it higher because racecard.

[Badgaz]

Cool thanks

[MJTru]

Isn't vtc offered by mines. And some other Japanese companies. I remember seeing a video with the r34 mines gtr where it was turned on and compared to after and before results.

[Piggaz]

That would have been the HKS "driving performer". 2.8, T04Z and V-Cam.

[KiwiRS4T]

And a couple of Aussie workshops have installed VCT on the RB26 head but I assume it would be a pretty expensive exercise.

[MJTru]

How do they do it. I understand how the gtst VCT works with oil pressure and solenoid and all. But can someone explain how they do it on a rb26. ???

[scotty nm35]

Same way, usually with an external oil feed. The HKS Vcam setup is similar, just using a VQ35 variable actuator and external feed line.

[Ben C34]

And they take all your money.....

It's definitely not cheap!

[MJTru]

Oh. That was a simple expansion. Lol. I was hoping for a diagram or somthing. When you guys say expensive. What are we talking about. 5k. ???? Or more.

[scotty nm35]

It's a fairly comprehensive kit, it comes with an Fcon etc but not cheap. http://www.nengun.com/hks/v-cam-system-step-1-a-b

Looks like it's all but discontinued now.

As you can see, there are a lot of parts in there, but you only need a few of them really.

VCT would be even easier to retrofit I guess, and a lot easier to control.

[MJTru]

Thanks mate that's some interesting stuff. It's also expensive for real. For that money and some brain power i can build more power than the 5+k there asking.

[Ben C34]

Thanks mate that's some interesting stuff. It's also expensive for real. For that money and some brain power i can build more power than the 5+k there asking.

That's true, but it is not about power so much as response.

[MJTru]

I agree. All I do is drag race. But I do have a gtr I drive on the street. I totally understand your point mate and I agree as well. I guess it would give a rb26 some guts down low.

[scotty nm35]

There is nearly 1000 revs of response in it from my experience, between off and running cvt, and my VQ engine only runs variable intake, just like the Vcam.

[Blackkers]

How much does the timing on the intake cam actually change by? It's not like there's an extra cam lobe like in a honda or anything

[scotty nm35]

I think 40 degrees normally on the VQ35, but Nismo released a 50 degree advance mechanism. Not sure which one the HKS kit used. They are hydraulically actuated, but here is an electrically operated clutch arrangement on the VQ25 that could be retrofitted easier perhaps...

[GTSBoy]

If you look at the listing on that Nengun page you can see that the basic V-Cam setup gave 30 degrees (between 90 and 120) using standard pistons and the special one gave 50 degrees (75 - 125) using special HKS pistons.

[bigmikespec]

I think 40 degrees normally on the VQ35, but Nismo released a 50 degree advance mechanism. Not sure which one the HKS kit used. They are hydraulically actuated, but here is an electrically operated clutch arrangement on the VQ25 that could be retrofitted easier perhaps...

Is that just on/off Scotty or is it a continuously variable closed loop system?