Lithium

We definitely had issues with boost creep with an internally gated Kando TD05-16G on an SR20DET, but it was easily fixed with a bit of porting - the OEM Mitsubishi TD05s even had the same issue if you opened the exhaust up too much. I think OEM Supra and RX7 turbos can have the same issues as well, even some HKS internally gated turbos have been known to boost creep... its not that unusual with an internally gated turbo unfortunately. Here is are dyno plots for the 16G I tuned on a stock SR20DET, just did some porting to the wastegate port:

Don't we all Maybe you should hit up the FP guys, but the way I picture it the 71HTA with DBB core could be a response monster with the ability to make decent power - probably not quite what your Skyline made, but it'd be real world very quick. Realistically, don't be a wuss and just get an FP Green HTA ... you have the cams for it, have some fun

I don't know for sure, would have to speculate really and I tend to lean on the edge of conservative. I'd have picked the 71HTA to be capable of 310-330wwkw on E85, though yeah probably not 300+kw on pump gas. The 73HTA I'd put as similar to a GT3076R, so 340-360wkw on E85, and the FP Green shouldn't be much different to an HTA GT3076R (370-390kw). That's what I'd be guessing anyway. Strictly speaking probably can't go far wrong with any of them, the 71 would probably be a bit mental haha.

Yeah I doubt the FP Green BB even would be hugely lively under 4000rpm, it is still a fairly big turbo in effect - though in hindsight I have in my head FP will now upgrade any Mitsi based core to DBB, so something like a DBB 71HTA might be a nice balance

Good luck

An EFR6758 would be amazing on it (aside from only being T25 flange), or a GTX2863R - if OP is willing to splurge that much. Precision don't really do much in the right size range.

FP HTA are very real competition, the 6466 is a particularly good offering however - but from FP you have the "rest" of the awesome turbos. Some of the best value for money turbos I could think of for small/medium sized engines in order would be (some real rough and realistic E85 power ranges): FP GT3076R HTA - For 330-380kw @ wheels FP GT3582R HTA - For 370-450kw @ wheels FP GT3586R HTA - For 430-500kw @ wheels Precision PT6466 CEA - For 500-600kw @ wheels (basically it just seems to do so much so well!!) FP Super 94 HTA - For 580-680kw @ wheels (same as above - but larger scale) Those are my favourite considering price, reliability, fitment, spool and power.

Yep I reckon the PT6466 CEA is Precision's best moment, it basically always seems to deliver - the better the setup, the crazier the result. Looking forward to Scr48's result... should drive very nicely on a 3litre and obviously the potential is there for massive power, even the .84 will make a lot but if it ends up not being enough then going to a 1.15 hotside would allow for unrestrained silliness I'm not 100% sure yet, but one thing I am not sure of is if someone puts one on a high flowing RB (ie, RB30 with aggressive headwork and cams) if they will flow enough per psi to keep the big engine happy - they seem to be keen on high pressure ratios for their power, but that might just be the cars they've been on so far. Thats the only reservation I have at all, and it may not be justified.

Here's a clip of the FP Super99HTZ equipped DSM doing 8.18 @ 176mph : Devin the owner/driver/tuner says that there is still more in it, and will be winding it up for glory next weekend - hoping for 180mph trap speeds and ?.? ETs

I assume you are going T3/external wastegate setup? I'd go a Kinugawa TD05-16G - much better spool and response than the 18G and well capable of 220rwkw, there is virtually no difference in flow potential between the two compressors.

That is a fantastic result! Very nice, thanks for sharing!

Yes, again... That is high octane fuel. I have been saying it will make over 700whp on higher octane than 98 the whole time. Show me a 98RON result over 700whp on a Dyno Dynamics and I will happily admit in am wrong - but either way it is clear that the 8374 is a awesome performing turbo and I am trying not to overstate it's potential.

ID1000s would not be sensible for 500wkw, it might be possible to hit it but you'd have to be leaning on it imho

So far the only cars I have heard of making that kind of power on the stock side mount manifold have run nitrous oxide to do it - RIPS in NZ did a couple in his early days. I wouldn't be too surprised if you could squeeze an E85 setup up to that power level, but if it were possible it would not be that nice on things (E85 is quite good at covering up a not-flash-setup) and I'd say would make no way near as much on pump gas.

Good luck, man. This is going to be a beast :-D What kind of boost/power are you going to target on this tune?

^ I totally agree with all of the above, the only reason I ever mentioned the EFR7670 is that people insist on -9s being one of the best turbos for stock stroke RB26s and an EFR7670 would still be better suited

I can't know for sure, but I know I wouldn't have the confidence to book a dyno tune hoping that much power at JEM on the stock exhaust manifold and a .63a/r housing personally. Remember Stao runs his cars on a hub dyno, and uses a Brae exhaust manifold... one way or another it is quite likely to make things much easier to make that kind of power, especially as the boost gets up. I'd expect a PT5558 should be able to flow a bit better than a GT3076R - but you'll need the whole setup to be up to the standard of making that power on 98.

Yep that is who I was talking about too, except he made 372kw. I suspect your stock manifolds will quite quickly start making getting any more power on pump gas quite a bit harder as you start pushing past the point you are at now

Got a link to that result? I know of someone who made around 370rwkw with cams, FFP, high mounted etc but not other than that. Do you have those supporting mods, or stock manifolds?

Yes, with E85 from the pump... highest 98 RON number I know for an EFR8374 is ~460kw @ hubs from SubBoy's RB30 with internally gated EFR.

Ditto

Please quote where I said that? I am certain they can make that power, would need E85 or other high octane fuel to do it... But doable

Lol Yeah the wording was a bit hard to follow, I had to read the post a couple of times to get (what I think...) he meant. Yeah making that power "nicely" I think would involve a nice modern 67mm turbo - so yeah, PT6766 and also the Super94 HTA I mentioned (which I have an ulterior motive of just wanting to see how mental they would be on an RB haha)

Easily. But if it's hypothetically capable making that power on 20psi through an auto, I doubt it will flow enough to supply enough air to boost the same engine to 35psi For all intents and purposes he's asking for a turbo which would make 600rwkw (give or take) through a manual on E85 from what I can tell

Not sure how well a RB25 would go with an auto and that large a turbo - you won't be getting full boost until around 6000rpm at a guess, and mid-ish 10s with 350kw would be pretty damn good going too, depending on the chassis. If you are split between E85 and petrol for practicality, just go an ECU (and tuner ) which can handle flex fuel tuning. Are you specifically after a Precision turbo? FP have turbos which are a tad insane for sale at the moment which would be pretty mean for aiming for low 9s - again depending on overall setup: http://store.forcedperformance.net/merchant2/merchant.mvc?Screen=PROD&Store_Code=FP&Product_Code=NTFPSUPER94&Category_Code=Turbo-FP Can be attached to a T3 manifold and make pretty much all of the power, and while it would be hardly a street turbo it will provide a huge amount of power for the spool and is very very cheap (at the moment) for what it is. If you are looking for turbos of this hp area (1000hp+) then you're going to need some serious engine work - headwork inclusive if you hope to get everything out of a turbo of this size on 'up to' 35psi. Otherwise something like a Precision PT6466 or something of the sort wouldn't be a silly choice. I think the faster times he was aiming for the unnamed "race" power level - 350kw was street mode.