Lithium

I'd try doing a compression test.

How are you testing the EGT? Any chance you have a leaky blow off valve or some other intake leak forming?

If you look at the title it said "No chit chat, just results". I think its very fair to have assumed he had no intention of providing much more information. If it was "My new drag car" with the same attachments then it would have seemed more like a teaser. Either way good luck with the car, looks very serious and look forward to hearing strip results - cool to see someone is using one of those auto setups, a lot of GTR folks seem to have a grudge against them despite them making a lot of sense.

No question of that, it looks like something if the setup is right should go into the 8s very quickly.

Haha can you elaborate on which one is your choice?

^^ Does nothing for me

Initial track results are in for 370Zs, on Tsukuba they bust out a 1:06.6 compared to an R34 VSpec2's 1:06.3 so the V-Spec JUST nudges it out but it'd be a good race.

Yeah its starting to look at it that way. I'd treat it as an equivalent of a GT3076R, or roughly a 500hp turbo.

There's a pretty neat new number added to the RB30 dyno results thread - more power, no methanol in a car which had already done 8.05 @ 173mph with its old tune: http://www.skylinesaustralia.com/forums/Rb...0&start=60# At least gives a bit of info and you can easily find videos on youtube as well Fingers crossed the weather is fine in Auckland this weekend, then there should be a bit more of an update on the car

You did look at the comments on GT2835s on a Neo and a R33 RB25? GT2835 is barely different to your GTRS. A bigger turbo doesn't magically tend to add more power on the same boost level unless the smaller one was becoming inefficient on the particular motor its on. At 270rwkw you are pretty much getting into "outflow the GTRS" type territory, as such you never know - with your bigger cams/"race porting" you could have been elevating exhaust pressure to the point the turbo was choking and causing reversion and your tune may have had to have been pulled back to make it safe, and a stock R33 head may have actually been better for you. If you were talking GT3582R and tried that on both your car and the R34 (and whoever did your "race porting" did a good) then maybe the results would have been vastly different. Your results are at odds with a lot of stuff I have seen. The reason I asked if you got a before and after is not for our benefit, if I were going to invest the money in doing a whole pile of head work I'd seriously be trying to get a before and after comparison with no other changes to make sure it has worked as I had intended. Messing with the part which dictates how the whole setup works is a good way of making or breaking a setup, quite frankly I take "Years of research" etc etc with a grain of salt. It doesn't mean they didn't have a bunch of monkeys doing the R&D, spending lots of money doesn't necessarily make something work and having a head with big cams and flow numbers doesn't mean its going to work optimally with the other parts you have bolted up to it.

Nice power, whats the setup? Where are you based?

Did you get any before and after cams and race porting dyno plots?

From what I've seen the majority of it is the extra boost they run, and of course the supporting mods to allow it to do so safely (bigger turbine a/r, intercooler...). Whenever we dyno'd them with intake, exhaust, fmic and say 10-11psi they always seemed to make similar power. The only R34 I know of which has dynod on the same dyno as my car was tuned on with upgraded turbo etc was only running a T3/T4 and made a fair bit less power.

They are running Garretts, and that EVO is tube front - there are no tube frame GTRs that I am aware of and Shep last I heard may have given up on the AWD chase.

bozodos - What do you mean by the appropriate sizes? Suitable turbine housing size or..? I treat the HX35 as roughly equivalent to a GT30R. Quite keen to see these videos of 7s runs?

I'm not sure it'd be worth the effort, the R34 RB25 has a variety of improvements - ie, solid lifters/more aggressive cams apparently and the real world performance difference seems negligable. I'd rather just get a decent set of aftermarket cams gives they tend to give good gains across the board.

You are clearly assuming/hoping that the Skyline isn't similarly equipped There were Skylines running around on the streets of Japan ten years ago with the same power or more than what you'd make with an EVO with an HX52.

I think he is implying that RB20s are stronger than RB25s, I tend to ignore those comments these days haha.

How are you going to address the fact that the bore sizes are seriously huge mismatches? 78mm bore into a chamber designed for something with a 86mm bore? Its not going to be nice in there at all.

Thats not with twins though, thats a dirty big GT42RS turbo I went in one of his cars running a twin scroll T04Z setup on a FullRace manifold with twin wastegates and I honestly can't see how you'd get more responsive than it. He stomped it from anywhere between 3000rpm and the rest and the thing would literally launch up the road, I honestly wouldn't believe how hard it pulled from virtually any revs if I hadn't been in the car myself. The dyno plots definitely don't tell the full story. A very staunch pro RB26 mate of mine with a 500whp R32 GTR was in the back seat (I have always been pro no-replacement-for-displacement) and while it was more than I expected despite expecting it to be really good, he was an instant convert.

Are those races 3rd gear roll ons or something?? I couldn't watch the clip so just going from the datalog. And 30psi!!!! How much power are you making on that?

Here was me initially thinking this was a topical pisstake thread relating to the RB26 vs 30 one hahaha. Seeing as there was a question asked about trying to make an RB20 breathe I may as well try an answer - doesn't one of the R34 offerings have a Neo RB20 head? Are they any better than the R32 one? Maybe that could be something worth looking at?

This should at least give an idea - exact same car, dyno etc. Went in to RIPS as a typical R34 GTR with all the normal bolt ons done to it, came out as an RB30DET with a T04Z. Sure the new engine is running a bigger turbo and more boost etc, but everyone here knows that if it were still a 2.6 the power would start climbing far far later. I'm sure there was another plot somewhere of an RB26 with twin T67s that ended up becoming a 3litre, I might be wrong though. Boltons RB26DETT (stock R34 BB turbos) vs RB30DET T04Z otherwise same car:

Pretty sure the motor in question is the TB48DE which is a twin cam injected petrol 4.8litre straight 6 complete with VTC (like RB25DETs). They don't rev particularly hard but are strong as hell and at the end of the day a huge motor so torque and power are going to come naturally. They are a 99.5mm bore, I doubt very very much anything RBish will suit them - I'd expect new mounts would need to be made up and they'd generally pack out an RB-intended engine bay easily, not sure what you'd use for transmission. There is a little aftermarket support out there too, lots of >700hp ones running around in the Arab nations so there is bound to be information on them somewhere. Have a nosy here: http://www.briancrower.com/makes/nissan/tb48.shtml

I know of them from marvelling at Arab drag/sand racing patrols over the years but not so sure they'd drop straight into an engine bay designed for an RB-series engine. An RB30 is not a completely different family of engine by any stretch.