Lithium

AWESOME to hear, sounds like its going to go VERY fast...

I hear this ran a 8.7 this weekend and looks like it has plenty to improve on.... congrats John and keep it up

Ahh ok I was just making sure that was clear And in no way am I implying that running more boost would make it more responsive! I was just making sure that it was clear that a big/plain bearing turbo won't be giving anything away to a small BB turbo in fatness of power delivery once its at the same boost level. It'll obviously take a bit longer to get there....

The reason your power delivery is so much fatter for most of the graph is you are running 18psi......

I don't think there is anything to clear up. Keep going to the same dyno and you can compare your own progress with yourself. If you want to see how fast it is - you race it. There is varience between most dynos anyway, so there is no point measuring using someone elses stick... because there is always going to be someone who says the reading is "wrong".

But you can enter whatever you want into the calculator

Fair point - gotcha. I think people say rwkw as a matter of habit Moroso is a calculator based on estimations and assumptions. A dyno is far more direct... an engine dyno is the only thing that tells you how much a motor makes. The drag strip is the only thing that tells you how fast it is down the 1/4 Most people these days are savvy enough not to claim their car is quicker (or not) based on whatever the dyno spat out. Otherwise I'd probably be pretty keen to get on the lowest reading dyno anywhere and take the credit for being a better driver than everyone else haha

It is a hub dyno - as has been covered. He's clearly making >250rwkw, if he was making 200-210rwkw thats what the readout would have said. Its all relative, the dyno is a tuning tool etc etc etc. So, on that dyno - realistically he is making 250rwkw. Dyno Dynamics is somewhat of a minority in terms of the dyno results I've seen around the world, only contended by Mustang dynos in terms of low reading - so I don't think you can really say his reading is wrong Dynapack hub dynos and Dynojet rollers seem to have some degree of parity between them.

Good to see how the Masterpower turbo behaves. The reason for the high reading is Dynapack hub dynos read higher than the world famously low reading Dyno Dynamics dynos. Dynojef and Dynapack dynos (which outnumber the Dyno Dynamics which are rarely used out of Oz) read ~10-15% higher on average it seems. I made 274rwkw @ 15psi at only 6000rpm before we stopped the tune on my R33 on Speedtech's hub dyno... power was climbing steeply there. I run a GT3076R with a stock RB25 with Nismo 555cc injectors, and walbro pump.

Yeah thats why I said I was breaking from the habit - hardly anyone has actually posted their own cars. I could have posted some awesome ones of other peoples.... but anyone can find a random clip on you tube.

To break the trend a bit, this is actually my car - problem is the external drowns out the turbo's spool a lot in that clip, have been working through a boost creep issue so the wastegate is venting to atmo until have got that sorted (its actually got a new manifold going on it at the moment). http://www.youtube.com/watch?v=ClXcNtAMJjg

I'd go with a GT4088R for that power level Better spool than the T04Z, better flow than the GT3540R.... somewhere in between/closer to the T04Z in power potential.

So the fact that the Heat Treatments GTR reached 300kph in under 7.6s isn't taken as a record because it wasn't targetting 0-300kph?

Do they bolt on to the dump as well?? I'd check that out. The Garrett ones have a more aggressive trim option if I understand correctly - so you can get more power and more lag if you want

For outright performance they don't "own" an RB26DETT, though they definitely don't embarrass themselves - what makes them a particularly good buy is how cheap they are (at least in NZ) compared to an RB26DETT. They are even quite a lot cheaper than RB25DETs, which they in some respects are a bit better than.

How much more than 300hp? The area of around 300whp-350whp I'd just go with a GT3071R. I haven't had a full tune as the car has had a niggling boost control issue for ages, its getting a bunch of stuff changed over the next month which part of the result should be better boost control. There are dyno plots on here of people using GT3076Rs though...

Some of the quickest RH9 cars were running GT3037 (GT3076R)s, there is a guy over here in NZ running two of them on an RB26DETT and I'm pretty sure its getting under a decent head of steam by 5000rpm. Why not just go a GT42R though?

I have a .63a/r, I have full boost ~3500rpm in 3rd - very hard to tell because it sweeps past those revs too quickly, which has to give some kind of idea of what its like Depends on which GT3037... the 56Trim GT3076R will spool exactly the same as a 56T GT3037 running the same turbine a/r. I think I'd be happiest with a .71, it spools REALLY quickly for the size with the .63 (easily quick enough) but the extra increase to .71 would probably make it a little more progressive and allow it to flow a bit better up high. Me and a mate actually drove each others cars back to back this weekend actually - he has a R32 GTSt with a S2 RB25DET running stock turbo still. Driving impression, his is way better than mine up to 2500rpm under foot... then 2500rpm to 3000rpm his is noticeable better but nothing exciting, then from 3000rpm onwards mine feels like its made up all the difference and is keen to show stock turbo who's boss.

You can definitely get them in T3 flange for Skylines as well...

Actually don't know anyone who has had a problem with one yet.... couple of high profile cars in NZ have been running them hard fine. Don't know much about that particular unit however.

I still reckon from how my GT3076R drives that a bolt on GT3037 from HKS will meet most of those requirements. They will pull hard to redline, have excellent response, make good power, and have an awesome midrange whack. If I did it all again, I'd not go smaller than a GT2835/GT3071R but not go bigger than a .82a/r GT3076R.

Niiceee.......... guessing thats going to go quick.

Looking very nice. I have a friend who likes the way the GT3076R behaves on my RB25DET and wonders what it'd be like on a 3litre. Well we both do... as I'm yet to 100% decide what to do when I get to the rebuild stage.

Nice - how is this coming along? Are you running one of the 56-trim GT3076Rs (with the anti-surge cover)? It'll be really interesting to see how you find it on the RB30.

Yep, my GT30R was exactly the same - quite a bit smaller.... I almost wondered if it was deliberate so instead of over shooting it'd undershoot the size of any manifold it was attaching to, and you could match it to suit from there.