Lithium

It is the Ford style one - using stock manifold, and the split in the Ford-style housing "looks" at least to be nicer than the concept of cutting the stock manifold, or using one of those nasty 90degree bend spacers. At this stage I'm only aiming for basic upgrade power levels - and getting enough flow to the external is the highest priority as I'm running a standard internal motor and want to keep boost levels in check. A lot of things will be changed when I end up with for forged internals - ie, new manifold and turbine housing... In real world terms - for the stage I am now, how obvious do you think the upset flow will be - or what effect it will have?

Yeah thats what I'd figured - I had independantly done research and decided on the GT37 job, but with a .63a/r turbine hsg at least in the meantime. My initial setup with it is stock internals and only 1bar anyway - so hopefully the .63a/r won't be too much of a huge problem. Tell me if you feel otherwise. When I go stronger internals, I'll probably go .82a/r and ~18psi. Cheers on the manifold pressure rant as well - ties some things together I had been pondering about This is mine test fitted to an RB20 for fab reasons etc (its going on my ECR33): And with wg, dump pipe: Got oil and water lines made up and the turbo in car now, just sorting out intake piping and the dump -> exhaust fabrication and then it should be pretty much ready to run.

The first part of your post I fully agree with and understand, just wasn't going to say it all for the sake of being concise I'd love the money and the facility to try some of the combinations you have described, they sound really good in concept. I have it in my head you can get a 52-trim T04S covered GT3076R from some places? If I remember rightly the only GT3076Rs we can get here in NZ are 52-trim. Now you mention the pressure in the exhaust manifold vs. the inlet side - how do you determine whats actually going on there?? I had otherwise assumed that the pressure on the turbine side (before wastegate opened) was a good thing, and would help spin the rotating mass up faster - and once the wastegate opens there is additional release. Anything not required to maintain targetted pressure ratio, completely bypasses the turbine housing/wheel and just goes "somewhere else". Cheers

Interesting, I've seen people on here talking about that kind of spool with .63a/r GT3582Rs - and ~4400-4500rpm with .82, high 4000rpm with 1.06. I'd imagine that all things being equal, a GT3076R should have a few hundred rpm on a GT3582R.

Haha. I think thats acceptable, most people were suggesting for me to get a GT3582R.... I think the GT30R HAS to be better even before it hits full boost. SOME positive pressure <3500rpm no doubt. This is the post with dyno plot (and boost plot): GT3076R Dyno (56T comp, .63a/r turbine hsg) Can't wait for the weekend

Discopotato - Have you come across anyone using the GT3076R 56T w/ .63a/r turbine housing on an RB25 and encountering surge? I've read up on people around the world using .63 to reasonable effect without any issues, they just get choked up high (ie, when trying to push well over 400whp Dynojet style). In the RB25 Dyno upgrade thread there is a dude running a 56T GT30R who got >274wkw running the .63a/r turbine housing on a stock manifold and motor and it looked like it was all good. Mine (again .63a/r) should be running this week, so I'll be able to give driving impression this weekend - tuning is on the 30th.

The Zs are VQ series - the drag ones do not have RB motors dropped into them, though there are a couple in the build that I am aware of over there. Aren't Rigoli's building a RWD drag one as well?? There is a RWD tube frame drag car based on an RB30/26 hybrid in NZ at the moment as well. The fastest would have to be the old HKS S13 with the RB26, did a low 7 if I remember rightly... years ago.

I'm guessing you guys know that in testing at Willowbank Heat Treatments have got down to 7.73 @ 183mph? They have a reputation of systematically getting quicker and quicker - so fingers crossed the weather is good for Jamboree! That'd be the quickest run ever by a Skyline GTR in Oz - quite cool when you consider the HKS drag R33 has raced there!

For what its worth guys - in NZ the EVOs also had the reputation of being quite hit and miss for a while, I guess ultimately the EVOs dont have quite as fancy transmissions available to them as the GTRs - and they don't run autos (the ability to load up converters etc) so it was possibly a bit premature to go over to Oz when they hadn't even mastered the NZ tracks. The Rayglass datto and the Croydens GTR have gone over previously, and iirc neither disappointed. Heat Treatments GTR has been under development for much longer, and has always been a consistant runner. It has already cut an 7.81 with the current engine combination in NZ - and has always been "efficient" with its trap speeds. I am pretty sure I remember comments elsewhere on this forum about how slow its trap speed for its 7.9.... I'm not going to make a call on what the car will go like, but I think they're not just over for the one meet - and they've already done a 7. No matter what happens its going to be a show worth going to, but I suspect they won't leave until they've beaten HKS's time.

doh

Sorry - It IS still running a 4WD setup, and also ran into the low 8s before it turned to Methanol. The Methanol setup was the major change which got it into the 7s, and since then its got a new motor and turbo combination - who knows what THAT evolution is capable of. He's taken it to Oz to find out

This is all quite old news, it happened months ago. It was (7.81 @ 17xmph) the first meet with a new engine and turbo setup - the package definately had more in it, and has not done a meet since. I fully expect this car to go quicker than HKS did in Oz.... I recommend going to watch this - seeing/hearing it go in person is definately a hoot Theres no other GTR in the world currently racing that I am aware of which is going to show you solid 7 second runs.

If you want a real sexy sounding induction noise on a turbo Skyline - my 2c go on a port shrouded/anti-surge compressor housing turbo. Me personally, a real GT3076R (GT3037 style...) with .50a/r antisurge compressor housing - while the stock turbo has an awesome "suck", theres nothing quite like the jet-engine spool up sound Or get a T51R... a lot of people think its just because they are huge - or a signature T51R thing, its just because of the anti-surge ring. Moving lotsa air helps of course...

Whats to say Australia will be where they will have to defend their time? Heat Treatments may only be a meet away from beating them...

Niiiiice good to hear. I expect this will probably be quite unrecognizeable in its next stage - HKS's time WILL go down soon. No shame to them though, they were miles ahead of the game for years.

Just so you have a bit more of an idea on why there could be confusion - both the SR20DET T28 turbo and the stock RB25DET turbo run the SAME turbine wheel, which is also the same as the one on the POS T25 turbo which came on CA18DETs and S13 SR20s. This could be why some people say the Skylines have a T25 turbine. So do Silvias T28s from Silvias (as stated before) are T2x flanged while the Skyline units are T3 flanged (despite having a T25 turbine wheel) - and all the inlet and dump pipe plumbing fit to the two turbos differently as well, so doing the swap would be quite a fabrication-intensive task. The housings on the RB25 turbos are larger - and I'm pretty sure (not 100% though) that the compressor wheel on the RB25 turbo is also larger than the T28 unit. In terms of making more power because "SR20 T28s aren't ceramic and can handle more boost" - the ability to hold together at higher boost is irrelevant. A T28 from an SR20 would be maxed out at the level an RB25DET unit can reliably run up to anyway - so while the turbo can run over 1bar on an SR20, it'd be useless on an RB25 because all it will be doing is blowing hot air and getting sad - and more than likely dropping boost. It is definately not a worthwhile upgrade.

Are you totally sure of that??? I would have expected it to have been bigger news (and every man and his dog going for them) as all of their turbos from the S13 up until now have had the same crappy exhaust wheel...

This looks like a Spec2 R33 turbo to me, you can't see the "material" of the comp wheel reliably enough to make a call due to angle and light - but the spec 1s have a "twin blade" type setup which looks a bit like the RB20 turbos, the Spec2s have "single" nylon blades. Twin Blades:

Here is a dyno comparison from my R33 GTS25t with exhaust and intake. Only modifications between the two runs is getting rid of the factory dual stage boost control and putting in an R32 wastegate actuator, and tuning the car using an S-AFC2. Hope this helps

Haha yeah fair enough. The EVO was only a demonstration of what they can do - and a 4G63s are much better knowing for their off boost AND turbo spooling ability than an RB20DET, and then there is the whole matter of that with an RB20 you have two more cylinders - which in this case is bad.

FYI, some specific outputs from some JDM engines - Nissan SR16VE has 175ps, or 109ps/l Honda K20A is 220ps from a 2.0, or 110ps/l Honda B18C-R is 200ps from a 1.8, or 111ps/l Honda B16B is 185ps from a 1.6, or 116ps/l Nissan SR16VE-N1 has 200ps from a 1.6, or 125ps/l Honda F20C has 250ps from a 2.0, or 125ps/l The N1 limited edition motor should be honoured to make the same ps/l the highest output/l of a mass production motor

Thanks, that clears something up I'd noticed - in NZ and Oz people seem to call these things with T04S comp. covers "GT30Rs"... It looks like thats what Horsepowerinabox seem to sell. What are those turbos??? From what I've read elsewhere on the net, the GT3076R with the .60a/r anti-surge comp housing is the one I want - though I've been given the impression they come without a turbine housing!?!

I don't think there are turbos small enough to make it doable. You will be feeding each turbo with ~330-400cc cylinders, each of which are not good turbo spool cylinders. 6 T25s would be ridiculously laggy. No way near worth the effort or expense. Here is a pic of an EVO 4G63 with 4 turbos though, to give a rough idea of what a "clean" turbo per cylinder setup looks like:

Stock for stock the NSXs are quicker around a track and in a straight line than the GTRs - at least on average in the tests I have seen done by mad Japanese. The Nismo Z-Tune throws all that out, but theres no shame in an NA 3.2l RWD being slower than a GT500 car that got tricked into being a road car. VTiR vs. turbo Skyline, the Turbo Skyline ftw. However, Type-R vs. turbo Skyline - in a straight line turbo Skyline ftw, around corners I tend towards the Type-R. Fun for dollar spent, probably the Type-R - especially the way fuel prices are going.

Say around 550hp...