Just fitted Tomei Poncams in RB25DET

[Sydneykid]

PS. Does anybody know if you can put your dyno runs from one dyno on a disk and then take your runs from another, put them on the disk and then compare graphs directly??

BASS OUT

Hi Bass, the Dyno Dynamics software does it for you, you just load up the different runs and overlay them.

[Bass Junky]

Okay, here's my thought.

the Inlet cam gear is adjustable, not easily, but it is. Now I noticed the bolts in this were all the way to one side of the adjustment. I'm not sure if this was advance or retard, but it wasn't right in the middle..... So maybe this could be a factor?

I'm making up a ring to make the inlet gear adjustable shortly, then I'm going to give it a run and see how it goes with some adjustment.

I will first try it in the middle. Then play with it from there......

What do you think? Could this be the cause?

[TurboX]

 Now I noticed the bolts in this were all the way to one side of the adjustment.  I'm not sure if this was advance or retard, but it wasn't right in the middle.....  So maybe this could be a factor? Could this be the cause?

BAss I would think this sounds like the 30 RWKW Black Hole

Usually I believe the Intake is not moved any more than 2 Degrees so sounds like yours was way past this.

Have the bolts come loose and its slipped from when dynoing??

[Bass Junky]

I'm going to try it, but I wonder if the centre of this adjustment is the centre of adjustment...

Interesting.

SK?

[StockyMcStock]

when i bought my R33 head (non-turbo) the VVT inlet cam gear had the adjustable backing plate that you describe. mine too is adjusted fully towards the end of the range, i have no idea if this is correct.

EDIT: just by looking at it, it would appear that this position is the farthest advanced position the cam can sit at. is this where it's supposed to be? :confused:

[RB30-POWER]

My VVT inlet cam was dead centre, I've heard advancing or retarding cant remember which helps makes the motor a little peakier on the rb30 bottom end anyway. A few of the NA RB25/30 guys have changed the setting.

Either way i just left mine centred/factory setting, no use in just guesssing without a dyno.

[Steve]

Hope this hasnt been asked before (I didnt read all of the thread), but have you checked the vvt has been reconnected? R34 has both inlet and exhaust doesnt it?

[Bass Junky]

R34 has only VVT on inlet.

To be honest I havent' checked whether is has been reconnected. I assume it has.

How do I check?

[GTRgeoff]

Looking at the engine, on the left at the front above the water fitting is a long hex shaped object with a plug into the end. Make sure this is plugged in.

[StockyMcStock]

so anyone got a completely stock R33 GTS-T and can they have a look at where the VVT cam backing plate is in regards to rotation?

and why the hell is it adjustable, surely nissan would have found the sweet spot and left the holes there rather than making it possible to swing the cam around?

[Bass Junky]

Hey guys.

A couple more notes about the Cams.

Car now drinking petrol like a fish! 410 ks for a full highway run. 110 klms the whole way.

Vacuum gauge sits higher than it did before (meaning less vacuum), but that is to be expected.

I would 1 bar into it for a few seconds on the trip, and OMFG the thing comes alive! Seem's to be itching for some more boost. I never usually break traction in second in the dry, but I dialed up 1 bar, boosted it and it was all see ya later.

I am not running at 1 abr, or anything like it now, sticking to 11-12 psi for the sake of the turbo, but once the highflow goes one, look out!!

BASS OUT