Lithium

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...

Hi all, I was wondering if someone could shed some light on this topic for me.... I notice when people go for twin turbo setups for "light tune" GTRs, they seem to go for things like disco potatos etc. Recently a mate of mine asked what would be a good turbo to go for on their Starlet GT, saying they wanted a good streetable turbo which would let them get ~270hp @ crank. He had been looking at GT28 style turbos, so I went and had a look at some compressor maps and made some wild estimates. Something interesting I found, is that at least the way I was estimating the flow of the motor etc - SMALLER turbos seemed better suited to the 1.3, but at higher pressure ratios. Funnily enough... almost so much that a GT28RS would be a worse choice than a much smaller turbo for the same power level, as at the boost level required surge lines get precariously threatening etc - but the motor didn't look like it would breath enough in the "top end" to make the size of the compressor wheel at any given pressure ratio worth while. I looked around at other maps, and feel apon the GT22 with 59.4mm 52trim compressor wheel - which for the same pressure ratios (up to around 2.5) SEEMED by my loose estimates to be a lot more sensible. After that, I pondered the fact that half an RB26 might be a bit better flowing up top than a 4EFTE - but not HUGELY so. When matching a pair of turbos to a straight six, should you treat it like a pair of 1.3s? Because if my assumptions are remotely correct - that GT22 turbo could actually be quite a nice match to the RB26 for a mild upgrade over the stock turbos?! GT22 Map

Nah, the Speedtech dyno doesn't read low - that perception probably comes from the fact that the Chequered Flag dyno reads very high high. The Dyno Dynamics dynos that Australians use read real low, definately more so than Speedtech's Dynapack hub dyno. I wouldn't be surprised if it picks up a little bit of power with more kms on the motor and a tune, though don't expect miracles. I'm not sure why you want to upgrade the fuel pump etc etc, but with a decent intake and exhaust and a dyno tune I wouldn't be surprised if you managed to stretch it out to maybe 135kw @ wheels, though I can't see it making much more than that without some serious work. A mate of mine will be running his Maxima at the dyno day which goes very well - pick his brains on what he has done to it to make it go like it does, I wouldn't be surprised if similar style tricks he has done would work for your car. He's very analytical etc, so he will be able to give you a good idea of exactly what effect each mod he has done on his car has done to improve its performance etc. I'd like to give suggestions, but most of my NA tricks are relevant to cars with motors quite different to a big 3l which doesn't rev to high heaven

Here's a video of the Heat Treatments GTR doing a 7.81... Rather insane GTR

Wow... thats pretty big news if its true!! There are a lot of places around the place which claim that the top 3 GTRs are HKS, Heat Treatments, and Advance... I wouldn't be surprised if they could knock off some huge time with slicks, the thing has insane power and not so much traction from vids I've seen.

Ummm, when did Veilside do a 7??? And there are rumours HKS used a fairly sizeable NOS shot to help along their 7.67.... also, GTRs never were turbo at all until about 1989 I think Heat Treatments will be matching or bettering the 7.67 HKS apparently ran, probably worth noting they've already gone quicker than HKS could manage in Oz - with a dirty great big single and no NOS

I was pondering that too, but in the past have been left with a bit of a blush after assuming that a thread was by a dreaming school kid - fortunately I hadn't said too much, as the guy turned out to be very much legit. Something I find very interesting, is the NZ vs. Oz culture in going for turbo setups - in NZ, huge single turbos seem to be the preferred path whereas it seems you guys like twins. Seeing as the OSGiken kits seem to make something which is very similar to a 2JZGTE, T04R.Com may have some useful information. Here is a table they have put together as a rule of thumb for power output potential and boost thresholds for different turbo setups on 2JZGTEs: Mmmm GT47

I've read of other people installing GT3071Rs (in the US) on their cars, and talk about them having an anti-surge compressor cover?! I could be completely wrong, but that compressor cover isn't, is it?? For risk of sounding "ricey" but does this turbo have a particularly "whistly" induction noise when it comes on boost?