John Dixon

Sorry, don't quite understand what you mean?

Thicker head gaskets aren't always a good way to go. Although you decrease the compression you also increase the squish clearence and can sometimes end up with a worse detonation problem.

Thanks Rob, that's useful :xxx: :D Ryan's got me a 2nd hand one, cheers.

Anyone know the dimensions of the flywheel bolts and the thread diameter / pitch. Cheers

Fuel pressure should be 3bar at idle with the vac line pulled off, not 3.5. Will be making it a little rich too. Nice to see it's coming together :)

Bad O2 sensor won't put you in safety boost.

Emerald is very good and software is excellent. You're not going to get anyone better than Dave Walker to map it either, the guy is one of the best. Motech very good but also pretty expensive. DTA good but software horrible to use.

Don't disregard the stock ECU too quickly if you're not going down massively modded route. It can work well with quite highly modified cars. Obviously a standalone is better but that mainly comes from being easier to map and loosing the MAF limitations on a big power car.

The 2 solenoids are the EGR and AIV control solenoids on the drivers side (no AIV on series II+) The one on the left is the PRVR control solenoid.

The come as part of the energy suspension rear arm kit if you get that. MJP can do the originals but they're more than the poly kit for the two I think!

Lol :tongue:

NO! The pressure will only hold lower when there is a flow through it. If it holds lower and constant at all flow demands then its more than just a tap. DP = (8 μ L v) / (Pi R^2) Granted reynolds group is also proportional to velocity so you have to iterate it a few times with real numbers but as v --> 0 then DP --> 0

A regulator is a completely different device all together!! It's a variable valve with feedback from the downstream side of the restriction acting on a diaphram to close the valve. If it was simply a variable restriction without feedback then the pressure WOULD equalise when the flow was stopped.

But I'm guessing if SE installed yours they were used as bleeds not restrictors in which case that would happen. It may be that it takes so long to happen that in reality you can't actually do it, TBH if you know the volume of the chamber inside the wastegate then its fairly simple to calculate. Might do it out of interest if I can be arsed later on.

There is no net flow unless the wastgate is leaking and as pressure drop is proportional to flow then there can be no pressure drop. It might be that in reality it takes ages to get there but it will eventually.

Used to be a 4WD sierra at knockhill. Was really quick but kept breaking the transmission.

There's a lot more to it than that. With an EBC you can do things that can't be done with jets. They totally eliminate wastegate creep for one thing by completely blocking the pressure signal to the gate until a set level is reached so spoolup is quicker. Also, with jets installed as restrictors not bleeds you will still only end up with 7psi on a VERY long full thrrottle run as the pressure will equalise across the jet.

Think a VRH50A may cost a few bob though! Interesting it's completely closed deck too, water ways are external.

One of the most important things and often overlooked is how easy the mapping software is to use. Emerald is top notch some of the others are awful. Try mapping a DTA without the dial box - nightmare unless thay've changed it in the last few years. Was going to make a conversion harness at one time for emerald to Z32 but nobody was particularly interested.

If you leave them disconnected the cams will run in one position all the time. Can't remember off the top of my head if its advanced or retarded. Won't cause any problems though but would be useful to be able to drive them from a performance point to view. They're outputs only on the Z ECU.

Is pretty cheap actually. About the same as an Emerald M3DK system.

Could have been, not too sure? One of these:

How much is it costing out of interest? Wouldn't worry about the re-wiring it should be pretty simple.

Does seem like a complicated route to go down. Aftermarket would be much easier. Will have a look at the SS EDIT: Actually looking at the SS, it's really close should be easy to get that running. Have you scrapped the VTC on your car as there doesn't seem to be a trigger for that on the skyline. The rest of it should be pretty simple to re-arrange. I'd just do away with the FPCU and run the pump full all the time. Still use the relay to switch it, just scrap the variable speed. Presume you're using a manual box hopefully?

There you go. There was a turbo'd version of the VH that was destroked to 3.5l for IRL. Made about 800bhp if I remember rightly. 14:1 CR on the VH is huge, wonder if it was methanol burning?