Lithium

Yep, CHRA 700177-5014, people kept trying to supply me with them when I was after my 56T GT3076R as they seemed easier to acquire in this part of the world. I am pretty sure there are "new" ones still floating around... whether they are actually unused old stock or not I'm not sure but they were a genuine Garrett unit.

The force of a controlled combustion process (ignition wavefront chasing the piston) has nothing on detonation, the majority of the stress is pulling the piston up and down the shaft at funny angles. Remember the piston will be going that way anyway... the bang just speeds up the rate it does it Keeping the RPM to a sensible level and a good tune can keep for a fairly happy grunty engine for ages though there is naturally going to be faster wear when the pressures are up.

Tuners ideally wouldn't be present when rod failure happens, but the rods suffer far more from extra revs than boost itself. Obviously more boost and more revs are going to compound it, but with a good tune I'd say 4500rpm at 20psi is going to have nothing on 7500rpm and 1bar. Detonation is the other thing that owns rods....

Doesn't sound like there is much point revving it past 7000rpm anyway.... crank collar and oil mods been done to it?

Ditto, good reason my car is tuned for 17psi max on the stock internals - it seems happy enough there but after plugging the numbers into the ECU to keep it happy and safe around that boost level, it was obvious things start getting harder on the engine above that point.... and thats with a generally larger turbo on my car.

Equivalent sized SINGLE ENTRY single turbo, yes - and no its not a waste on a 20/25 as you only have to buy one turbo etc... imho. You have far more choice with single turbos, less plumbing, etc. Try working on a Skyline with a big single versus low mount twins haha.

I'm not sure what you mean by that? The front 3 and rear 3 alternate so with twins each manifold collects the same as a properly designed twin scroll manifold...

Will be good to see how it goes. The Dynapack I used is also not set to be a "happy" dyno - it has broken the odd heart around the place but IMHO I'd say a typical DD reading dyno would still drop both my and your power figure a little unless the Dynapack has been somehow calibrated to reduce its reading.

You are comparing Dyno Dynamics readings with a Dynapack reading - it can't really be done. The extra bit of spool before 4000rpm is just one of the things the GT30R does better. If I wasn't on stock internals I'd go and retune mine on a Dynapack for 21psi to overlay with the Hypergear turbo.... that'd be quite telling I suspect.

Umm I'm the owner of one of the cars, my GT3076R setup has LESS mods than he has (completely stock high km RB25, and had iffy coils which you can see evidence of in the midrange), running less boost, and my car has between 5 and 40kw @ wheels more than him up until he reaches his full boost which is over 4psi (21.6psi!!) higher than my PEAK boost in the whole of my run. The massive torque difference is due to me not going over 17psi - the only reason our power curves are comparable is that despite me running a fair bit less boost my car makes comparable power. If anything I reckon it makes the GT3076R look comparatively really good. If you want to compare my GT3076R with that turbo, overlay the 17/18psi graph that Hypergear posted above as its only peaking at about 1psi more boost than mine was running - instead of 4... still gives him an advantage but it should give much more of a fair impression of an internally gated .82 GT3076R vs a .82 ATR43G3. I'll be running my car on a dynapack next month now I've got new coils in it, it certainly feels a lot healthier through the midrange.

Be interesting to see how the figure compares to Mustang dynos, by rep they're similar to Dyno Dynamics...

PS, the other GT3076R dyno plot which is lower than my "red" line and the ATR43G3 turbo looks like it'd actually deal to both of us if it was run on a Dynapack - again, very misleading graph to show

Thats overlayed with my dyno plot by the looks of it, my coils completely failed not long afterwards and I have a set of Splitfires in there now - but thats probably more to do with the wavy line than the huge difference in torque once full boost is reached. My car was running a reasonably stable 16-17psi boost curve on the GT3076R, that other car is blatently running more boost. I can't provide a boost plot for my dyno "curve" he used there, so he won't be able to - but as much as there were "issues" with mine they wouldn't be anywhere near enough to cause that torque difference once his reaches full boost. To me that overlay looks like a GT30R running a normal boost curve overlayed with a laggier turbo running more boost but for some reason (running out of flow?) boost drops in the high end so its making barely any more power than the GT30R. A copy of the dyno plot and a boost curve on the same page for that setup to prove its staying under 17psi all the way would prove otherwise, but until then it doesn't look too good. What a load of crap. My car is running a Chinese intercooler, a bone stock (high km) RB25, an internally gated GT3076R and all stock manifolds. The only thing I can see any hint of being better on my car is the turbo... You are right, you'd beat mine in power/torque going by that plot but you are clearly running measureably more boost through it through the midrange - and I am very doubtful of keeping up in terms of response given it can't even spool as well against a dyno. If mine was running the boost it looks like you're pushing through that thing (and didn't have dying coils), the plot you provided quite possibly wouldn't be in the game. I seriously dislike seeing dealers try to pull the wool over people's eyes to make their product look better than others by using compromised or not-really-comparable setups as legit comparisons.

Will only actually be flywheel if they have something in the TCF field, the result I posted was axle power and I'd imagine if we had a 40%+ blend and were running 22psi we'd be at least as high as he was making. We had absolutely no hint of running out of flow and had a bit less lag, which is interesting as we were running a fairly quick run rate too.

Ah yep, thought that might be the case (hitting 24 and dropping back) - was going to ask, as the one we did sortof hit around 17psi and crept up to 20psi... hence having a bit more of a peaky looking curve. We were working with a 2.5bar MAP sensor so 20psi was about the highest we felt safe going to, still makes for a hell of a quick car though

Very nice And fairly consistent with one I tuned late last year, "unknown" T3/T4 on stock manifolds and a GTSLink running GTR Injectors and a Walbro fuel pump on 20psi, using E33 fuel. Do you have a boost curve? Looks like a real interesting shape "curve".

I know this, sounds a bit strange but it is honestly the reality - I think the twin scroll setup makes up for a lot of it. The twin scroll GT3582R cars I've been in are honestly feel too good to be true, the guys I know who have gone from single entry to twin scroll GT35 setups have improved spool by around 500rpm (pretty much the difference between an equivalent GT30R and GT35R) and make more midrange torque for an equivalent boost level. I haven't been in a Skyline with a TS GT35R *yet* but given they are a 6, the gains are only going to be at least as good as the 4cyl ones I've been in. From the cars I've experienced I'd expect 1bar before 4000rpm on an RB25 with good manifolding, and heaps of midrange. Naturally the TS setup on a GT3076R would be better again, but I'd say ridiculous on an RB26. Think of it this way, twin GT2860-5s have the combined equivalent "wheel" surface area of a T04Z... which spools better?

GT3582R with a 1.06 T4 Twin scroll turbine housing with a suitable manifold, similar spool to a GT3076R but more top end. Powerband in big doses

Yep, everything that needs to be said has been

Dynos read different. I was running around that mph with around that power, which I have made several times on different dynos. I don't know what JEM use, but 270ish kw in a full weight R33 definitely stacks up to around 113mph on a Dynapack.

Got propeganda? Clearly the most laggy/violent possible setup for that power level with a single and the smoothest possible for twins, that is SO not a fair representation. There are plenty of twin turbo setups which look like the plot you posted for the single turbo, and vice versa for single turbos with the twin turbo power curve.

Concidence with car setup, driver etc? I am pretty sure Superlap was dominated by guys with singles on even smaller motors The quickest NZ track GTR I am aware of runs a T04Z. The odds are a quickest track GTR would be running twins because the majority run twins anyway...

Why did you change from the GT3582R to a GT4094R? Would that have not been responsive/powerful enough for what you describe? As I mentioned on another forum, I'd have thought a T4 twin scroll GT3582R would be far easier, cheaper and generally better than going to -5s from your current position

No idea

Yeah its definitely staying, its over there to set the world record lower - that hasn't happened yet Also I believe they want to throw some street tyres on for lols and see if they can "adjust" that record as well while they have far stickier tracks to play with.