Lithium

Really interesting result - way more power than you typically see on that boost on an Oz dyno. If that's a fair representation of how it goes, then very impressive!

That is massive power for 98!

What fuel is that on?

In terms of results, a mate of mine got a .68 HKS 3037 tuned on the same dyno as I had my .82 GT3076R tuned on. On the same boost he made similar power with similar spool on the same boost, picked up slightly better down low and I made slightly more power. Basically in the dyno results thread you can ignore the HKS bit and look for GT3037 of GT3076R (not high flow, genuine Garrett T3 IW ones) and count those results as for the same turbo - the a/r will obviously just change the flow/response bias.

Yeah, basically that. Given they are probably still sold with HKS tax I would probably look at one of the Hypergear boltons which seem to make similar power with similar lag and are as easy (or easier) to bolt on to the stock location - while being much cheaper. Nice turbo, I love the old GT3076Rs but I guess it depends on what why you are specifically considering the HKS versus the good alternatives out there that weren't available when it came out

Its not a "did that" kind of thing - there is constantly new material added

Don't think you can get those comp housings, but you can get V-Band exhaust housings now - as far as I know

Hi Mr @shnaped_second - how are things going with this beasty?

It's a tad frustrating that there seems to be a culture of automatically assuming that a workshop/dyno/tuner who produces dyno results which read a bit higher than what you are used to the results/tuner are potentially misleading or dishonest and sometimes the info is taken less seriously. 50kw sounds like a LOT to lose, dyno variance or otherwise - you'll certainly be able to tell if the car is as much quicker after the retune as the numbers would indicate.

That's weird eh - then you have 34GeeTeeTee burning around every track day he can with an HTA3076 making 500+whp and not exactly holding back with no issues EFR all the things

Let us know how it goes Yep agreed - they all have different purposes, I get a bit irritated when people call some dyno "inflated" or another one "low reading" - they're just tools and you have to just pay attention to progress on the same car, and can't really compare between dyno setups unless you REALLY know everything is comparable. For what it's worth (I've mentioned this before) I've tried all three correction types a few times on Dynapacks and it absolutely is not 15% different, at least any time I've ever checked it. Tuned a result from an SR which I tuned in the Kando thread and posted up a 250kw @ hub result using SAEJ1349 (like Chequered) correction so it was on an SAU friendly scale for a car I tuned last year, but we have actually filed it for our own reference in DIN - purely because it's what we are used to after using Dynapacks that correction for nearing 15 years now.

Ok, on stock manifolds I would possibly look at it differently... I am not sold on expecting to make good use of near 70lb/min turbos like that. In regards to the GTX3067R results with .82 housing is in almost no way comparable to this, so many levels of different kettle of fish to this comparison. If you want a general indicator of comparable HTA versus GT on the same turbine, check out 34GeeTeeTees post on the first page of the HTA thread.

.. spool wise, but much more headroom

There would be a power difference but I personally wouldn't go smaller than a HTA3582 on an RB30, remembering that the HTAs spool noticeably better than the GT, the difference between a GT3076R and a HTA3582 on a 3 litre should also not be a huge deal

+1 with the latter two comments there, though with the top one - there is no standard here, different tuners opt to use SAE/None or DIN - STHitec and STM are a couple of the most respected tuners and both use DIN, a lot of others use SAE which gets a bit higher results. The SAE J1349 you are used to reads higher, by a relatively trivial (read <10kw) amount at this power level.

Sounds like quite a potent setup to me- remember 34GeeTeeTee has some good bits on his, not JUST the turbo.... good manifold(s), upgraded cams, good tune probably needed to make sure the full potential is realised. That power isn't messing around on pump gas! It should result in an awesome setup though, regardless of the final figure.

What are the bigger injectors and the GT30 tune happening?

That's a pretty good sign that it works then 34GeeTeeTee will spit tacks, those housings make awesome sounds haha

I wouldn't go bigger than .82 in single scroll - just to be clear, Garrett do different numbers for their single scroll and twin scroll T3 sizes. The single are .63, .82 and 1.06 and the twin are .61, .83 and 1.01. The .82 would be the go with single, just NORMALLY it seems that to get equivalent performance from a twin scroll housing you go up a size - but that's a sweeping assumption and will really depend on the design as well

I think 34GeeTeeTee was saying FP don't do TS - though I am assuming you will be just getting the Garrett T3 housing, either supplied through FP or otherwise. As a caveat - I don't know of anyone, or many who have tested the Garrett T3 TS housings so it's hard to know what flow etc to expect from them, I haven't actually seen turbine flow maps for them so I am cautious about saying what exactly to expect with them. Actually... I might have a dig and see if they have released anything. If they do line up well, then a TS HTA3076 on an RB25 would make a complete monster of a thing - I suspect. <edit: They don't appear to have released maps for them, bummer>

Oh yep, I read the post a couple of times thinking you may have meant that and it still seemed you were saying both spool and power. Yeah that makes sense, our testing with the PE1420 not flowing much more than stock but it was crazy responsive - 20psi at like 3100-3200rpm... but was choking the engine by ~17PSI, 16G on it now holds 20psi no issues but substantially less mental in response and needs till 3600rpm for 20psi. Sounds like the 28SS2 is a good unit on the SR

Are you sure the HG is more responsive than the PE1420? I am respectfully dubious - they are a ridiculously responsive, spooly turbo

Thanks - and nice DP, I am way too busy to get too into this at the moment but you covered a couple of things I was hoping to. Trying to work out where Dale FZ1 stands here, he (and Wolverine) seems to be saying stuff or implying he thinks we're off the target thinking this turbo is potentially a good thing but he just liked your post - Dale?

Yeah - as much of a twin scroll fan as I am, for the kind of thing you are after I can't help but feel a single scroll manifold and better matched turbo to your targets would be more cost effective vs reward. HTA3076 on a good manifold is really so far seeming like the goods, only know of 3 on RB25s (2 on this forum) but they've all made good numbers and been very responsive for that power. I have a feeling 34GeeTeeTee made near 330rwkw on petrol with his?

Can you confirm there are no other changes between those two runs? And was the lower boost on the 20G due to not being able to flow it? It's quite a different power curve shape, good power etc however