Lithium

Got mine from Greenline, to be fair I can't remember what duty cycle they were at but I remember working out that it would be a stretch trying for 17psi on E85 with them on the GT3076R Sent from my GT-I9505 using Tapatalk 2

Probably not, unless you already have the turbo.

Wow that's interesting, were yours definitely yellow top Nismos? I can't help but think mine would have struggled to do that.

Ahh ok - without E85 I'm really not sure of what to expect from a GTX3076R... somewhere in the low 300rwkw area at a guess.

A lot of those reasons come down to dyno. When talking dyno expectations on threads on SAU I am using a second language, I have to convert everything from what I am used to (Dynapacks with SAE correction running ~9s sweeps) to understand or suggest numbers on here. Even then not all DD dynos read the same for whatever reasons. It is clear to me that JEM's dyno reads much lower than I am used to - they have multiple 56T GT3076R results on strong setups which are maxed out under 500whp/373rwkw yet I've seen 56T GT3076Rs make that or more with more basic setups.

I'm sure if I prattle on about it enough someone will give in! I almost did it myself, and have half considered going back to the idea as I still have the car. Well it worked with Bri73y but because of non-turbo related reasons he hasn't managed a full dyno session out of it so far, though from what I hear there may well be a result sometime this week

^ agreed

So it's done, FP HTA GT3076R time?

I'd say it'd be killer mid-range and up-top, really low down (ie, sub 3500rpm) will be where it'll be giving anything away to GT28 and trimmed GT30 turbines and the difference is not going to be in fail levels, by any stretch of the imagination.

Those ratings will be crank hp estimates - and very rough really, going from the 64lb/min peak flow the compressor is rated to. Never seen a GTX3076R "all in" yet, but I'd expect that it'll be possible to crack 400kw @ wheels on E85 on a good setup.

In terms of spool on the dyno it was never going to match exactly, even with the boost curve nailed - but within 500rpm, more likely. In terms of transient response it may be closer again, but having a full size GT30 turbine and larger a/r will always keep it a little less snappy at lower rpm. Once on the boil it'll be gravy The overall performance will be interesting, however!

That sucks. This is on BP98? Did the tuner have any comments on anything that he may have found suspicious? When making less power than expected without misfires or any other obvious issues it is possible you could have one of these things happening (which the tuner will see). I don't clearly remember the history of your car so not sure if I am making redundant comments - sorry! - Overly knock limited... this can be caused by all sorts of things, easiest to check or identify on your car would be to identify if the CAS triggering seems to be working properly - Reaching MBT sooner than you'd expect (not due to knock - just not gaining torque as the timing advances) can happen if something is stopping cylinder pressures from climbing they should, can be a valve actuation issue - Fuel demand lower than you'd expect, or falling over. I'd tend to put this down to a restriction, as it basically means your overall volumetric efficiency is down due to something - if you need less fuel than another car making the power you expect you should, and with the same target AFRs, then it means less air is passing through the system. You aren't going to make the power without the air flow required to do so Just a couple of quick thoughts, may or may not be worth anything - but this situation of you having issues has been going too long and it'd be good to see you with a happy result so anything at this point can't be a waste, right?

Ah ok, nice I had considered getting one of those at one point as they seemed like they'd be really nice but for me they seemed just slightly on the smaller side for my liking - but still really good. Much prefer the idea of them to GT-RS! The overall tune in that plot is just a run in tune so I'd not take it as anything more than a loose indication of where things were going to be heading - I really reckon those things + RB25DETs would be a match made in heaven. At least by my tastes

Edit - argh its been ages since I looked at it, I thought it was 17psi by around 3400rpm, my bad. Looking at it, it looks like you both reach 13psi by around 3300rpm on E85 (comparing fuel for fuel). After that point it is hard to compare, partly due to dyno scale and partly as his looks like it has a lazier boost control setup which is totally unrelated to the turbo itself so after that point the boost climb tapers off. If the boost kept climbing like it was, it looks like it is on a similar kind of mission - the GT2835 might have a tiny little edge over it, but comparing with a turbo which is flow wise a much better match to the engine and capable of 100+whp more I think it's a pretty respectable thing. I never said it was exactly the same, when you are talking 100rpm or so it is hardly going to be worlds apart - and that is more the point I was trying to make.

Probably something Borg Warner like

What boost/power level? You might need something a bit fancier than a Precision if you want that combination

Nice. Hits 17psi at the same kind of rpm as Bri73y's HTA GT3076R did on E85 on his run in tune Maybe we should try and peer pressure Bri73y into doing a 1/4 mile run when he has his full tune done on his car and see how it goes. I never claimed a car with one would be a 10 second car, but I reckon with the right setup it would be possible.

6466!

Do you have a dyno plot of full boost by 3250? How much boost was that?

Like for like the cast GT compressor wheels are typically apparently nearly 30% heavier than the HTA ones - I'd go out on a limb and say that the GT3076R-HTA wheel is probably lighter than the GT3071R (and GT2835) wheel. Obviously you then have the .82 (as you mentioned) to factor in, but then you also have the greater wheel efficiency of the more modern design... quite a few swings and roundabouts there - but I am more thinking about the net result of the conversion than the initial spool. I personally loved the .82a/r GT3076R, and the HTA is only likely to be an improvement

Its a stock engine, with a stock gearbox, and a track car which had more power than braking/traction last time it was out so pushing the turbo to it's limit right at the start (we've already maxed out and popped a PE1420 lol) is not the highest priority It will make more than enough power on 18-20psi at this stage. When the VE head goes on things will get more interesting

I'll put my neck out here and say that as soon as once someone gets an HTA GT3076R to their RB25 and gets a full tune on it there is a good chance that may change

So you (or your tuner, or both?) have previously have told me that the correction you use reads like a Dyno Dynamics dyno, whereas my 280kw (was actually not running that power either of those times, more like 270kw) was on a hub dyno I've been told many times reads optimistically... so to use what I've been effectively told back on you - my car only had around 240-250kw when I did those times. They were all run on an airstrip with sub-par traction, I'd have had less on the DOT drag tyres (not full slicks) than you would have with ET Drag Radials - I struggled to go sub 2s 60ft but still did 12s with 2.0x 60ft times. I realise it is slower, but I had hardly any opportunities to race the car due to no dedicated strip nearby and all things considered it isn't hard to extrapolate that it was barely scratching the surface - and still clearly could do 12s.

Stock cams And I am not going to push past the MAP sensor's range.

Believe what you like, R33s and Soarers with T67s and GT3076Rs can and have done those kinds of times - well not 10s specifically, but definitely close to. You have a "better turbo" and better bolt ons, more boost, better fuel and you are aiming for times I was hoping to get near on my next outing with my R33 but unfortunately never happened due to the local strip being shut down. As it was with my heavy full street R33 (with stuff in the boot) running BP98 with an internally gated/stock manifolds GT3076R I had hit mid 12s on ~15-16psi and a conservative road tune and a slippery track at that point, before retuning to around 300kw on 17-18psi. Even without the extra power I was sure I would have done better times with more seat time at the point I hit mid 12s, if I had E85 I would have been aiming for 11s on that setup, even with boost set to around 18psi.