GTRgeoff

Ben, stop taking the fun out of life. Shouldn't you be off fleecing some rich bugger while providing them another awesome setup? Just clarify for me what circumstances the standard cams are better for with the VCT? I have a favourite answer for every question. It depends. In this case there are 8 direct variables and multiples of associated variables. What grind on each cam, not just a flank trim but maybe different lift and duration; what cam gear on each cam; what advance or retard on the cam to match powerband to application. I realise you have your favourite setups that you know work, which is great when you have to offer quality product and service, but some folks like to tinker, and that is part of their learning process including the limitations and failures. Someone as well respected as you should offer more than a one liner.

Doh, Saturday at Mikes.

Likewise a set of reground GTR cams is no hassle to fit and way cheaper for similar specs. And they all need something to drive them Ash, in an RB's case belt driven gimbal sprockets, commonly known as cam gears. The choice is whether you want VCT or not, or vernier or fixed. Fitting takes an hour for a skilled mechanic (well me anyway) so that is no issue and you already have one. As far as the R32 plenum goes, I took a look and they don't appear compatible as the 2 rear runners are offset to clear the master cylinder.

What are BIG numbers SK, again it depends, but point taken. I spoke to a Qld racer yesterday who thought 400awkw was too big for the track, but that doesn't address the issue of forward facing plenums. I simply see them as another optimisation tool to be used in the appropriate role....higher rpm/high power delivery, eg. drag or dyno queen in this case. Certainly though if a plenum like this can be used at the $1500 price range that gives a greater percentage increase for any given system configuration over the stock plenum then it may be financially more beneficial. Just taking a SWAG (scientific wild ass guess), as I have never CFD modelled the 25 intake I'd suggest over that 450 rwhp figure in the appropriate application. Simply because that's a point at which pistons should have been changed (and a fine rule of thumb to use I might add) and the rods upgraded so some money is being spent on the thing now, and to overcome the inherent restrictions in the plenum/runners (angular changes, small(ish) throttle body, joins, surface roughness, turbulent wall growth to name a few). Not that chucking some extra boost at it won't ovecome these issues, but they present tuning and logevity concerns in their own right. Principally a higher peak combustion pressure to produce the same power, so essentially the MEP chart will add up to the same area. This means something has to be working at a higher stress for zero quantative power gain. Ginko, I can understand your thinking but for a net 8% improvement it's a bit much to suggest the ECU has to be tampered with. Ever hear of someone willing to pay $10K for a Kart engine? It just happened to be one of those freaks that everything works right on so it produces more of everything. No I didn't buy it, and nor would I, but I knew who did and it won a few national championships. For some price is little object. Also I've had a chance to closely inspect my turbo recently to determine what mods were done to make it perform like a 2530 and i can't determine one single difference, and yet it produced 220rwkw with a fantastic mid range on stock injectors (and Malpassi FPR) with PFC. The engine was fresh with a good bottom end so maybe that contributed. I just think you should consider the system effect rather than blithely state it must be the ECU, then bet the farm on the outcome. Also the seat of the pants is the only way a racer knows how his car feels, and most of us know the difference between a bad drive and a good one but quantifying the power is at best a guess. it can be a starting point though

I'll watch. See you tomorrow at Mike's?

Memph I tried a set in my 25 which was producing 220rwkw. Power under 5krpm was very poor and idle not so great but over 5k it really picked up. Using vernier gears I found the thing was worse whichever way I went. I'm sending them off soon to get the profiles, which are great for solid lifters as in RB26, reground to suit hydraulic lifters as in RB25. The ramps on the 26 cams are more aggressive off the base circle to take up the clearance needed for solid lifters, so with hydraulics it cracks the valves earlier leading to poor idle nd loss of power. Cost to regrind is 280 at Ivan Tighe in Brisbane. There is a current thread on here so do a search and you'll discover more.

The casings are clearly different, and while the internals may be as strong, or even an identical item, the housing is what allows the box to remain optimal regarding location and running surfaces. So the answer is that it's a matter of conjecture whether one is as strong as the other. The GTR32 box could be put in without attaching the front prop shaft. Since the GTR feeds power to the front, and is nominally RWD it should be fine with little power loss due to the clutch unit hanging off the side. That said i don't know anyone who has done it.

Never!! Driving a wagon slowly erodes the sports car driver view of life That does look very nice though. Maybe time to have some kids and get a wagon

As SK indicates, multiples are always an advantage for response and throttle control, hence the advantages of side draft webbers (and their copies like Solex) over singles in the carby days. Still today, nothing sounds better to me for induction than a NA multi throttle car. But if big numbers are your joy then a big front facing plenum with all the effort John is putting in is worth considering. This is one of those horses for courses issues. The only true answer is "it depends" relating to your application. While I appreciate the discussion, some of it is a little rhetorical, with not enough foundation on the litmus test of "will it suit my requirements?". Ginko, I feel you were a bit harsh in your statements, especially from one who has contributed so little to the forum with a whole 27 posts since Apr 03. Way to go on the cred dude. Some of us have at our disposal resources that allow some more scientifically based engineering judgements, while others do what they can with just the seat of the pants, and best of luck to them, at least they have a go. John is putting a serious amount of capital into developing a home grown product and deserves our support, but he also allows us to take some shots at his methodology and that takes some courage. Remember his zed is a piece of machinery to be reckoned with so respect his intent here. By posting on here he is also gaining the benefit of many opinions, after he sorts through the drama. If you think it's crap then just go back to lurking in the fringes, or offer something truly valid. John may just take you up on the offer of your house and car. If indeed it is an untouched ECU then that is an indication of the worth of this plenum in the appropriate application. Aerodynamics superimposed over the theory of impulse mechanisms is more art than science, and trial and error are just as valid as the equations. Certainly the turbo, AFM and injectors can deliver the power, but by optimising the delivery system for the air it can set up an environment of flow acceleration that outweighs it's theoretical value. Ultimately most people won't buy from a considered position of engineering and testing but "does it look cool" and "I was in my mates car and it went fully SIK". This appears to have the potential to offer both. Keep up the good work John, and please, continue the debate. In due course I'm certain John will produce the appropriate dyno charts, but it's up to him to release data that is really his intellectual property and possibly could limit his market advantage.

With good clamps a single piece should work fine.

Still cleaning them up, about 5 so far!!

OK here's a few lil' pics, and a known RB20 torturing scumbag! Threw in the front one to show off the new bar

I understand from Steve this box has been rebuilt with nitrided syncros. Unfortunately he's a bit light on info at times. Otherwise read the forum rules. If you aren't making an enquiry or making an offer you aren't welcome to post opinion.

Guys, you need to call Steve to get a timely response as he rarely has access to the computer. The boost controller looks a whole lot like pictures you'll find on the HKS/any_ performance_parts_site_selling_their_stuff site. The wing is bonded to the bootlid with sikaflex so will be difficult to remove, hence the sale together. Steve says anyone is welcome to come by and look, just give him a call.

It's a bit congested over there, what with custom piping for the twin snails. Nice wrap on the pipe though.

Get some 3 inch hose and 2.5 inch hose. Cut the 2.2 inch so you have about 1 inch length on the pipe, then put the 3 inch over the top. Clamp both ends (get decent clamps, about $6 from Autobarn/HIS Hose Somerton and ensure the pipe has ridges or weld spots for retention) and there is a perfect, yet cheap reducer. Only good for about 1/2 inch reduction. BTW HIS Hose have a good supply of straight in many sizes, right up to 5 inch I think. Autobarn Epping have some pretty blue/purple stuff and some reducers.

Here, get this up ya's, impatient buggers. I used nylon coated steel wire rope of about 5 mm diameter using bulldog clamps on each loop. Then a stainless crab to join. I will be installing the aerocatches when Nelly isn't looking ....shhh

Nice to see guys. Not enough 33 pics Gordon but nice anyway. post lap times here http://www.skylinesaustralia.com/forums/sh...ead.php?t=46199

And at one track day I saw the scrutineers pass a 10mm web lanyard for an ID pass, that was connected to the plastic grill insert on an Astra.

Can't see my dramas fixed before then either.

I seem to be following you around. With the HICAS lock you don't need the HICAS compatible boss, but if you ever (in a moment of insanity) reinstall HICAS then the wheel needs to be changed. Feel free to call me on 0408 124 767

http://www.aerocatch.com/ I'll take pics of my setup tomorrow with the wire rope as an alternative.

Yoshi, I did have a little heavy steering at low speed but some extra caster was added and I haven't noticed it for months. There are no lines on a 33, just electrics but otherwise it's as you said.

Drift is still at the bottom of the pyramid. See below Roy gave it a squirt at Calder on the weekend and said words to the effect of it's fun but circuit is still a bigger rush and more exacting.

Well if you can keep that other proposal quiet you can add to the loot