Lithium

Couldn't disagree with this more - so bored of hearing Aussies say that. If any dynos could be said to read "untrue", its Aussie dynos. Low reading doesn't mean more true. Very much agreeing with that - not sure why sd9k is asking for advice and then basically ignoring it. Sd9k - you are LUCKY that you haven't blown your engine up running that kind of setup, the ECU is obviously trying to save it and with no help from the S-AFC. A Neo by no stretch of the imagination gives you a decent proper tune, and you shouldn't be running a bigger turbo like that with stock AFM/injectors/pump. I am pretty damn sure anything else you try at this stage will not work, a proper ECU and associated fuelling changes are the first things you should be considering. Really - you should have done that before changing the turbo if limited funds are an issue.

Just for interests sake, a twin 3" exhaust would have the same cross sectional area as a single 4 1/4" exhaust so its not actually as wild as it sounds. Depending of course on how wild you think 4 1/4" is

Thicker head gasket and it should be ok. I know of a few people who have run their RBs on 20psi just with a thicker head gasket and a decent tune in it. I run a GT30R and have kept it in the 1-1.1bar range and the car is at 150000km, having run up a good 30,000km on ~270rwkw and loving it still.

Sorry about that - though I think most of the blame should be pointed at one distinct person, when on forums it takes a single rotten apple with a bee under their bonnet about something and make claims to discredit a company or way of doing things when its not actually true people kindof have to make it clear that its not true to stop misinformation bleeding through the information superhighway. It ruins the thread, but realistically the moment people join a thread and start putting bollux in it - it has already lost its usefulness as a place to get information. The difference is that until people state otherwise people who find it won't necessarily know that its been hit with BS.

I know, why I said its impressive for what it is - still is (aside from power) more suited to drag runs than the R34 GTR mentioned here. Maybe a better example would have been "Put the R34 GTR's engine in Hi Octane's GTR". On that note, aren't they actually going to an RB30 now?

So RIPS has provided video of 8 and 9s cars he has built, dyno plots, information on what he has built and has a bunch of happy customers. You come to the thread with a large percentage of your total posts on this forum making completely unsubstantiated claims to try and discredit someone who is really putting NZ on the map by doing good quality work and producing results and happy customers. Its funny how the only people who bag RIPS aren't people who have had work done by him.... Considering that a lower spec RIPS motor (unreinforced block, stock crank etc) has blown away Croyden Supra's "street car" record in NZ by nearly a second which the Croydens car was running apparently 900-1000hp to do I don't know what you are on about. Would be quite keen to see this "1200hp" HT GTR dyno plot too, if you are so well connected. You are right, a 2.6 can do the RH9 thing - but it sounds like the guy would like something streetable too. Having spoke to Joe Kyle running a 2.6litre with a T51R in NZ and who has been trying for ages to crack the 9s mark (after years of trying is still .5s away from RIPS' only effort a much heavier car thats had a single shot at it) he says the car is a piece of shit to drive on the road, laggy as hell. I guess you get what you pay for. Can only imagine what the Blue R34 would have done on an Oz track with a bit of weight removed, its full power utilised and a clean run done using a sequential gearbox - I would bet more than a marmite sandwich it wouldn't be a fair race for the still much lighter Hioctane R32 GTR. Thats not a dig at the Hioctane car, massive effort with what its got.

Yeah its true - though from here it seems pretty much draconian what you guys have to put up with, over here they are looking at making externally venting blow off valves illegal now (already like that there?). Wtf, how does that save our planet? I have been dreading the requirement of catalytic converters but can fully understand and expect them to be a requirement.

Still seems? I dunno quite what you're getting at, but I don't ever recall the highest revs you can reach is a tangible indication of good performance. The whole 8.7 @ 162mph in a street car is however. If revs were the most important thing then we could just put little 2stroke motors in our cars High revs is one of the best ways of killing an engine fast...

You speak like the RB30 is a completely different family of engine to the RB26 - where as in fact the RB26 is an engine which is built as a compromise... it has basically been circumsized to fit within a "4litre" type motorsport engine size restriction, or 2.6ish litres times 1.6. Thats off the top of my head, so could be + or - a little but you get the gist. The RB30 however is the non politically correct, non circumsized and non castrated peak of the RB engine's range... not allowed to play with the others because its too big and scares the girls. In drag racing, street driving, or general "mines bigger than yours" beer fuelled discussions that class restriction is not in place - so the RB30 is free for the taking. Its not a low revving torque only thing, when they have an RB26 head on them the only thing it might not do QUITE as well as an RB26 is rev - which really doesn't matter as the RB26 is going to need to rev 15% harder to shift the same amount of air, so it NEEDS to rev yet ironically it has less grunt available to get it up to those revs. If I were going to go for a serious GTR, an RB26 head RB30 based engine would be my only option. Sure, people still with the 2.6litres will make a joke of it as though they are on at least even ground but the reality is despite what the girls tell you, size does matter... and if its bigger it doesn't mean you're less likely to know how to use it

I don't know - I used the best dyno plot I could find of yours using pump gas, and a few people have eluded to it being one of the best examples of power delivery for an RB26 around... I used the dyno plot from this thread: http://www.skylinesaustralia.com/forums/Tw...le-t183511.html Apologies if I got it wrong, I had the impression that it had every intent of being a very aggressive setup. I realise you built the motor yourself, though I believe you do that for your crust so for all intents and purposes is a professionally built engine? Here is the thread I got the RIPS dyno plot from: http://www.gtr.co.uk/forum/95214-r-i-p-s-n...0whp-1-bar.html

Sorry it might be that my brain is on holiday today - but I'm not quite sure what you mean by you have decided. Does this mean you are going to do RB30? And if so you will soon, or will wait for a while first?

Whats wrong with the GT4094R? And do you mean Borg Warner S372? I'm not sure there is a S472 and the S372 is a completely nuts piece of kit - will make as much power as the highest power turbos mentioned here.

Bare in mind Dirt Garage's car was built to basically set records, the R34 was put together to be an awesome street friendly one- more about drivability and general accessible grunt. A better comparison would probably be one of a RIPS built street/drag car running an RB30DET with a GT4202R on it - here is a comparison of each of their pump gas tunes. (edit: I had the RB30DET T04Z overlayed initially but it looked like a lower powered big block V8 compared with a RB26 so it wasn't really a logical comparison)

Oh I suppose I could have posted a dyno plot of an R34 GTR with stock turbos vs the same car running an RB30DET with a T04Z:

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.