I am thinking about getting a 300ZX and wasn't aware there was variable valve timing available on 300ZX engines. On my current Honda Prelude VTEC, the VTEC variable valve timing makes a BIG difference to performance but i expect it is not as noticable on cars with turbos. From what i have heard the Honda VTEC system is the best variable valve timing system on the market and has never had any recorded failures so is the Nissan version anygood/worth having or does it cause problems and is more trouble than it is worth? Does the variable valve timing kick in at a certain rev point like the VTEC system? from what year does the engines have the VVT? how is this shown?

it's not like the Honda systerm from what i understand, i think it's only on the ex cam. a few car's have this kind of set up (with differant name) BMW 6cyl 24v 91-on, Lotus Elan 89-94, it's more for good fuel than power like in the honda.

I think later 300ZXs DIDN'T have it.

But cam profiles were adjusted to compensate.

 

One of the clever lads will know for sure.

It's an on/off system that advances the inlet cam depending on engine speed/load/temp. It does make a difference, you can see it clearly on the dyno if you do back to back runs with it on and off.

Variable valve timing is on all zeds until 95, then it got removed for emissions regulations in Japan.

Does it kick in at a certain rpm? Just wondering as im having trouble above 4k rpm.

4900rpm on a stock TT ECU

What about one of your ecus?

5900 on mine, works better like that at higher boost.