Lithium

A mates EVO started doing that with his 35R randomly and his turned out to have damaged compressor blades, hope its not something like that.

How much are you wanting to spend? If you're baller, then a Garrett GTX3071R or a Borg Warner EFR7064 would be the way to go - if you're middle of the road then a Garrett GT3076R with internal gate, otherwise something like a Kando Dynamics T67 would probably be pretty nifty for a budget option if they carry on behaving as nicely as people are finding them so far.

Video looks really good, too much glare on the gauges (maybe the crap monitor I was using) made it hard to make out, looked a bit like you were backing off just before 1bar but it puts across enough to make it clear it builds boost solidly and goes like the clappers. Very very nice - best cheap turbo I've seen in action so far, potentially one of the better options out there fullstop really. Whats the rest of your setup?

Thats impressive! I actually think thats about the same as what I get - got any vids? I am sure mine would be a bit better with better manifolds etc, but still for a cheap turbo that can flow that well... hat off. What I don't get is why so laggy on the dyno plot? Surely the dyno run doesn't last as long as you get through 2nd get with that good spooling? If I stand on the throttle at 3000rpm in 2nd I don't get a lot of time...

I am sure if the guy is fine with the car at 420whp, he's got the peddling to deal with a high power S14 and has an idea of what the chassis copes with a bit of power like. For the higher power level you are after I'd have thought bigger cams etc would be a good idea too.

Very impressive!

Ah ok so really kinda hard to compare ultimately

Yeah not sure why some people seem to struggle with the GT3582Rs in Oz, one of my mates did 10.6 and had cracked 130mph in a full weight R33 GTS25t running 20psi on BP98 with a GT35R with less than perfect runs - to avoid dyno comparisons its probably worth observing that it has to surely be making a reasonable amount of power? Really hoping the same car will be tuned on E85 with a PT6765 soon...

The 52trim GT3076R is 55/76 versus 54/71 for the GTX3071R... the GT3071R will definitely respond better than the 52trim GT3076R, though I still don't know how that depends given the GTX3071R substantially outflows the 56trim GT3076R - the 52trim doesn't really have any place in the comparison imho.

Interesting thing is a GTX3071R flows 10% more than a GT3076R at most boost levels you'd run on an RB25 - imagine one of those on an ethanol blend on an RB25.... expensive, but I can't think of a combination with a fatter streetable power delivery potential.

Would be interesting to see that chart, I've seen plenty of .82a/r GT3582Rs making 1.4-1.5bar by around 4300rpm on RB25s No surprise about the GT3076R result, really - I wouldn't have compared the two. Ah ok yeah the extra rpm for building boost would probably have something of an effect, might be interesting to try mine from 3000rpm sometime.

Not stock cammed, but if its stock cam then not making 385kw on pump wouldn't be due to the turbo not being up to it... a GT35R would do it on E40 on a stock RB25 though.

WTF?!? My GT3076R is making those power levels before 3500rpm

Very nice result, the spool seems respectable for a cheap turbo making that kind of power:) Spool is almost as good as a .82a/r GT3582R, but GT35Rs are capable of much more power than that with E40 at that boost level on a hub dyno. The power level on straight pump is achieveable, actually... I'm picking the 1JZ won't be too far behind

What a/r hotside were you running, and how much power did you make with it?

The people who have recommended the GTX3076R - have you guys wondered at all about how the GT30 hotside will support GT3582R levels of compressor flow? Borg Warner have done a similar flowing 76mm compressor in the form of the EFR 7670 but they have gone with a bigger hotside than the GTX3076R, and I am wondering if the GTX3076R may end up being a bit more like a better spooling GT3082R. I am awaiting results on these new turbos before I get too excited, the GTX3071R is the only one I can see being fool proof and one of those aren't going to meet this lads requirements.

You ran yours on a Dyno Dynamics eh? Most of the results from people in US seem to be from Dynojets and Dynapacks which read quite a bit higher than Mustang and Dyno Dynamics dynos - how does the car actually feel power wise? Wouldn't be surprised if you threw it on a Dynojet and found you are actually near 500whp... there are people who have done that power on mildish RB25s on Dynojets with GT35Rs.

Yeah that's what I'd have expected, and yeah if I went a GT3071R I would actually definitely use the .63. The trick is the 76mm compressor is heavier and its going to be a bit laggier, no point half committing and getting the extra lag without the full extra flow. I would LOVE to actually drive an R33 with a .63 GT3071R actually, it was my first choice - though I don't regret the option I have it'll still be nice to know what the grass is like on the other side. If I rebuild my RB25 I'd probably go to a GTX3071R, 6lb/min more flow with less lag definitely has me intrigued.

When loaded up against a dyno you might be able to tell the difference, but in the real world IN MY OPINION the difference starts becoming a case of you'd have to go from a car running the .63 and then jump back into one running .82, and back and forth and have a big think about it to try and work out which is which if you hadn't been told which was running what... assuming they were both otherwise identical. The way I remember it there was a slightly lazy feeling sensation from 2500-3000rpm when going to the .82 which went away once above 3000rpm. Lets put it this way, if you have a healthy stock turbo car next to mine at anything 3000rpm+ and stand on the throttle in both the difference in response negligable enough that anything that may be gained in that instant is negated almost immediately afterwards. Full boost at 3500-4000rpm doesn't mean that its dead until then.

Its been a long year thats gone really fast, if that makes sense. Just to clarify, I've gone from .63 to .82 and I'd never go back to the .63 - the .82 is smoother and imho generally more fun - results in a much more knock resistant setup and boost control is noticeably easier, makes it seem like its the right match to me. A .82a/r GTX3071R would be really really fun I reckon.

Oops, I ment to say the .63 only showed advantage over the .82 below 3000rpm.... above that it started waking up pretty similar from memory and generally feels nicer to me. I reckon the .63 GT30 hot side is too tight for something that flows 50+lb/min. I shouldn't post techy stuff when I have the flu

IMHO the .63 showed its major advantage over the .82 below .63, I have had both and there is no way I'd go with the .63 again. With an old GT3071R I'd consider .63 possibly, but with the extra compressor flow of the GTX3071R I'd go .82.

Nice, keep us posted - shouldn't be any reason it shouldn't be able to do that... look forward to seeing dyno plots to show spool etc as well. On pump gas I assume?

+1 - you get best answers by questioning. Its a shame Precision don't post compressor maps, really.

In regards to the 98 pride brigade, I don't know how prevalent E85 is in Oz but NZ it is at no pumps but can be bought from performance fuel suppliers at a good part of double the price of pump gas - when you consider the rate of use of it going up substantially over 98 as well it becomes pretty uneconomical for anything other than dyno or drag hero runs, and then a pita because you'd need two tunes and become efficient at draining fuel tanks.