Lithium

GT4094R would be the next step up, then a GT4294R, then GT4202R

Mine was around 2/3 to start with but I actually have them set to around 5 at the moment, with 1st and 2nd gear set at 7ish. I am still playing around with different settings but since i set them higher the car has been sticking WAY closer to its target boost. The feedback as far as I understand is how often it samples and corrects, which (how I interpret it) means it can provide abrupt boost level changes if you have a good external wastegate setup. I have an internally gated GT30R which seems quite lazy about its behaviour, so having the boost controller "all over it" seems to help it build up boost faster then level off better once it has hit the target boost level. I recommend at least playing around and finding out what works for you, as different things definitely seem to work better for different setups.

Don't be silly, HKS aren't so helpful as to provide what kind of flow you should expect from one of those turbos. Aside from price, its the main reason I'd never own an HKS turbo

This is why I said go RB30, you can blatently tell the difference. One of the ones RIPS in NZ built for a customer makes near 500kw @ wheels on pump gas, and has more power EVERYWHERE than what it did on the stock R34 turbos. If he replicated the exact same turbo/cam/power level on the RB26 then it'd be a different situation altogether. The cool thing about extra displacement is that it has more torque all by itself, if you add boost it just piles it on - if the RB30 had the same boost curve as an RB26 it'd make more power all the way through the rev range. The thing is, the RB30 spools the turbo(s) harder as well so it will make even more power everywhere in the rev range - so you may as well counter that and get an even bigger turbo which is the same if not a little laggier than the ones on the RB26, make more power/response all the way through the rev range, and make a metric crap load more up top with no compromise.

Maybe try increasing 5th gears feedback?

9s from a T04Z has been done and given that Hi Octane's R32 GTR did 9s on a pair of GT2860s which flow a fair bit short of a single T04Z, I'd say its completely conceiveable. Anyway, I think its a moot point - RB30DET all the way. There is no replacement for displacement, 86x86 ftw - the rod/stroke ratio is sweet as and if you use an RB26 head then you are at no disadvantage if the motor is built and tuned right. Here is a video of a street R34 GTR running an RB30DET and a GT42RS doing its first ever run on a drag strip with an H-pattern box:

Yeah can definitely see what you are thinking there, though I'm not 100% sure that it wouldn't work still. All the wastegate has to do is drop the manifold pressure, and its going to do that regardless of where it is so long as the angle for the feed pipe to the wastegate is angled sensibly and the wastegate is big enough. To me, those basically seem ok. Thats my first impression though my confidence is similar to my confidence that I won't get salmonella next time I buy KFC.

If you look through the RB30 turbo results you'll find one of the early results have a T66 with a .84a/r turbine housing running a 25 head - should give you an idea (full boost at 4500rpm for that setup I think). It will be laggier than that

Hmm its definitely not something I'd do for a street car, I assume you are hoping for something which will make in the area of 1000hp and don't mind being as quick as a 1.3litre Corolla from the lights? Here is one of the only GT30 setups I know where the owner hopes to retain some driveability with their GTR: http://www.gtr.co.uk/forum/101521-world-fi...d-up-diary.html

Whats the point you are trying to make, or the opinion you want? My opinion on what happened there is a car designed for straight line speed was better at straight line speed for a car designed for cornering. Put them on a track and then funnily enough the car designed for corners will do the same to the one designed for straight line speed. Get a Toyota Echo and a Mitsubishi EVO and do a fuel consumption test on them and you'll find, unsurprisingly that the Toyota Echo is more economical.

Best of luck for that, and yes - can see that the power is up there by the way the car wiggles around at half track... all HT's faster runs the car looks like it wants to check things out on the sides of the track, probably does near half a km on some passes haha. There are some people in the UK doing mid/low 8s who seem to think the only thing holding them back from running 7s now is adding the power - I'd love to know what its like in the car when you are getting down the strip but from the safety of the side of the track it looks like the whole run gets a lot more dicey as you start trying to push the thing down the strip in under 8s.

By spot on do you mean more or less consistant with the other dyno types, or just consistant with other Dyno Dynamics set up for shootout mode? I have noticed that there seem to be occasional readings from DD dynos which seem similar to what I'd expect from a Dynapack.

Yeah this is the short of it, dynos are all over the place in readings - in Australia they seem to be all up the crapper as once I think I am starting to work it out a new strange result comes up. Dynapack, Dynojet etc used around the rest of the world have a bit of variance but they are all close enough to each other to get a rough idea. I am glad to hear you are running ~1.1bar, its about what I expected for the trap speeds you were running (as said in an earlier post) - so long as its on a turbo which can more or less support it thats what it should trap. On the dynos I run on for what its worth, I'd expect it to be making in the territory of 250rwkw with a crap load of torque.

Ahh ok, yeah so once you have paid freight + GST then they are equally expensive...

Haha I'm not sure if you are joking or not, I knew someone who had that honest opinion. If you went from your RB20 to an RB25, do you think you'd suddenly not try and milk everything it has to give? You've done an awesome job of making RB20s look better relative to its RB25/26 cousins than it should do - I credit you and your car setup more than the engine, makes me wonder how you'd go with a decent RB25 or 30 The dyno plot you have used there doesn't really show anything, all I get from it is you have a different tyre speed vs revs to the other two cars and are probably running more boost. Australia, for heavens sake - get some hub dynos!!

Very true, actually. Best of both worlds!! Either way, Mark's car as clearly well up to the task of giving the HT lads a good run for their money in a race - he's gone quicker than the HKS R33 could do on Willowbank. If there is ever going to be an event with both there, I will travel to see it!

I wasn't talking about the dyno power, I am thinking of almost completely disregarding Oz dyno results - they mess with my head. Now I am just talking about outright modifications, trap speed sounds like it'd be a better measure of what the engine and car is doing that trying to work out what on earth the different between your dynos and everyone elses is, I just want to know if his car is doing substantially more than what 220rwkw means to me if that makes sense? My car has run in the same kind of territory trap speed wise, running ~14psi through a GT30R on a completely stock RB25DET on a fairly slippery strip (actually an airfield...) but makes much more than 220rwkw on the dyno I run my car on, well actually ALL of the ones I have run it on which includes a rolling road dyno it made 260rwkw on. What I am hoping to hear is that my car for the mods it has that the times/trap speeds in the conditions aren't TOO bad.

I am in NZ, a mate of mine was running a Turbonetics T66 on his GTS4 for quite some time and it did hold on fine until he blew his motor and the oil got contaminated and stuffed the turbo. It was quite impressively laggy given it was on a 3litre, though granted it was a plain bearing/non GTK version. I'm surprised to hear they are potentially competitively price in Oz as here they are really expensive, probably part of the reason they are never used. Its interesting that in their country of origin hardly anyone seems to use them either if you look through specs of all their time attack and top drag cars.

The power estimates mate on here have me confounded - ~220rwkw seems to be the accepted approximate power for an R33 running 114-115mph? What is done to your car? On our dynos (well most dynos around the world) 220rwkw is achieveable at a stretch on a stock turbo but trap speeds >114mph are very much not achieveable with the stock turbo on an R33. To be running those kinds of times/speeds I'd be hoping to see you are running around 1bar of boost, maybe a fraction more otherwise I am about to get very depressed.

It doesn't close the gap at the top end... I overlayed a mate of mine's 205rwkw R32 GTSt dyno plot with my 280rwkw dyno plot from the same dyno. The R32 was running equivalent mods to mine (bigger turbo, ECU, injectors etc) but with more boost. His lag was about the same, and if anywhere the gap "closed" in the midrange which is probably mostly to do with the larger amount of boost - my dyno plot actually pulled noticeable distance away from his one above 6000rpm. Despite the hype, in my experience when you go a bigger turbo etc on an RB25 they rev harder than RB20s too, and still don't need to.

Innovative turbo HAD a website with information on those turbos but it seems to no longer exist, if its an 80mm inducer then thats way huge by most vaguely sane people's standards for a street car. It will be floating in the flow capacity area of the kind of turbos two of the fastest GTRs in the world (ie, mid/high 7s cars) are running, and also lag.

Haha I am in a bit of a pickle here, I love seeing these guys go quicker but between the fact I have watched Reece McGregor gradually go faster since 1998 and the fact that Heat Treatments are from NZ I feel a certain amount of compulsion to cheer them on too - so I'll keep cheering, but quietly hope the 7.57s mark doesn't get cracked until HT are racing again haha.

Shame they are way more laggy and expensive than the Garrett GT series, at least they are pretty and strong

Yeah it seems they are programmed into thinking that a good single turbo which isn't suited for >700hp is too small for a GTR, I guess it allows the "twin low mount" purists reason to believe that big singles are laggy. The reality is a GT3076R feels at least as good under foot than the stock R32 GTR ones yet is capable of substantially more power too - if you were going to go for an upgrade focussing on response with a measureable amount more power, a single GT30R I reckon would be the dogs bollux on a GTR. Don't tell a person about to drive it that its running a single instead of a pair of little twins and I doubt they'd work it out, aaside of course from the fact that a pair of GT-SS don't have a angry little anti-surge whistle haha.

I'd say you should indeed run screaming, sounds dodgey as all hell and doesn't look like the genuine Garrett engraved A/R 70" compressor housing. It looks like its supposed to appear to be a Garrett "T04Z", but putting "Precision", "Turbonetics", and then to top it off "Borg Warner" which just are not Garrett related at all just reasons my suspicions a tad.