Whos Interested In The Gt3076r/gt3037 In 52 Trim ?

[discopotato03]

Well I dunno about an RB25s strengths Lith but the people who sold them used less turbo and not a whole lot of boost or intercooler exhaust etc .

I will agree that a model specific GTRS is not real big but when you compare them to the factory turbo they are not tiny either . I think you need to keep things relative meaning look at an RB30ETs turbo or the one off the single turbo four cam VG30DET . Hardly big for the engines capacity .

Not too long back I was speaking to SK because my engine is very similar to how theirs was , the major difference at one stage being the GReady copy inlet manifold and they used a GCG Hi Flow in OP6 form . Also they used a 32GTR intercooler . Scott from Insight tuned that car and asked Gary how high they wanted it to go rev wise because the power was not dropping off , it kept climbing . In final form their engine had better rods and forged pistons and it cranked out 266 RWKW , it was rev limited to about 8200 . Gary said it was a great wide ranging thing and very torquey everywhere .

It was raced from time to time and never warped exhaust manifolds or turbine housings , it used Shell 100 E5 till that finished and then Ultimate 98PULP .

It would have gone even better on E70/E85 but we'll never know what the numbers would have been , guesses 270 with more torque everywhere .

He believes the secret was the larger exhaust valves porting and the Poncams , and the 9.3ish static CR .

There was at one stage a few comparisons of GTRSs and OP6 GCG Hi Flows and people who had used both claimed the performance was similar with the RS being slightly more responsive in transients . Ask Woolverine .

Anyway I started this thread because at that stage I wanted a GT3076R and I was more interested in better transients and a slightly lower boost threshold if possible . I was never really happy with the GT3071Rs and HKS must have had issues with that combination and used a cropped turbine in their version . HKSs sweet spot with GT3037s is the 52T version when not looking for outright top end performance .

I'm repeating myself again , if I can get better light load performance out of E70 I may still use my GT30 turbo but that means taking things to a higher level to support the GT30s gas flow requirements , pointless spending more money if what I'm currently using is good enough - for me .

Lith if I had the same 266 kw and it took a 0.82 IW GT3076R to get 300 , 34 more , is it worth it ?

I won't agree on your theories on fuel consumption because I believe the most torque from the least revs combined with close to chemically correct mixtures is where its at . In other words make the air pump (engine) as efficient as possible at turning chemical energy into heat energy and do so at modest revs . Most late cars except tiny boxes have moonshot gearing these days and if you can run leanish mixtures at low revs making adequate torque you will get good consumption . When you add a reasonably big turbo (compared to OE) you will get less hot side restriction but at the same time the rotating group spins slower and if thats not fast enough to make torque at cruise revs/speeds you're going back gears looking for revs to make bioost and torque .

ATM I'm trying to get better than 400km/tank on Eflex E70 and I don't go everywhere like grandma . I do the speed limits and its surprising how well my car sails up some reasonably steep grades in 5th at 80 Km/h or from memory 22-2300 revs . That RS is not making much boost to do this and it has the std HKS actuator and the Apexi boost control was set to 12 pounds from the std turbo days . I can't vouch for other peoples experiences but my GTRS is not all in with a thump at 2500 and flat as a tack at 5000 , probably my inexperienced tuning but it feels strongest in the 4-5000 range and its very progressive getting there . I don't want to try driving this car flat to the boards on boost because it needs a tune on the dyno at Insight .

I reckon a flat bar of boost would give it a wide enough range of compressor flow and actually I should go back and look at the map to see where the outer islands are broadest - pressure ratio wise .

Anyway Lith to each their own but I'll offer this . You bring your car to Sydney and drive it in such a way that your RB25 makes decent use of its GT3076R and try and keep your licence . I don't know what you're getting away with in NZ but you don't get away with too much here in Sydney and highly likely Melbourne . If you drive an Import here and get left alone its because they know your no threat to anyones longevity .

A .

[R31Nismoid]

(This is not the same rating as a Garrett GT2871R which is rated at 380HP on a 3l which is about 320HP on a 2.5l)

Can't say I've ever seen say, Garrett, change the power rating based on a motor size. They give an approximate of "350-380" for instance as a guideline.

Motor capacity has little to do with how much power a turbocharger can make as it's peak airflow. Airflow which worked out in lb/min from the compressor map taking into account the pressure at that point. A 3ltr motor requires less air to do it if breathing right, or the flip side, run more boost with the smaller capacity motor.

How the power comes on, where torque is made will all be altered by the capacity - but not the flow capabilities of a wheel. It will only flow so much and unless broken, won't flow any less.

[Mick_o]

I suggest you come take my car for a spin disco

[discopotato03]

T04E compressor housings before the GTX era were either port shrouded or not , part numbers would relate to housings machined to suit individual compressor wheels . If you have to have one profiled to suit your compressor wheel you need a housing intended for a smaller or smaller trim comp wheel . Also the tip heights are different and it has to be taken into consideration when machined .

AFAIK the GT3576 is just a GT3582R cartrudge with the compressor for a GT3076R in 56 trim . I never chased them up so I'm guessing they are the ones used in the later Typhoons ? Do the current ones crank out ~ 304 Kw ?

The early XR6 GT3582R used a 0.50 AR plain snout T04E compressor housing and I can't remember if the GT3576R uses these as well .

A .

[AngryRB]

I dont think the pull from a GTRS would be much more than a GT30 at lowish revs, with ethanol the GT30 even on 5psi which comes on very easy is more than enough to pull 5th up a reasonable hill

5psi on a GT30 is probably like 10psi on my old 2871highflow

Edited September 7, 2012 by SliverS2

[wolverine]

The transient response of a GT-RS would be very different.

[discopotato03]

This fellas had a GCG Hi Flow a GTRS a GT3082R and GT3076R on RB25s though there were some tuning issues along the way .

Anyway many areas around Sydney have reasonable grades and speed limits of 80 km/h, if you can sail up them at 2300 in 5th why wouldn't you . Crusing around at 100-110 in 5th you could throw the gearstick away because you don't need to change down with any grade I know of ie Catherin Hill down the Hume or Moonie Bridge on the Pacific . This is why in other threads I said that R33s could use slightly taller diff ratios because if they are set to make good torque at low to mid range engine revs they can pull it . If you spent all you time on expressways I reckon pulling 3.9 or even 3.7 diffs would be a snap - provided you have good usable torque in the 2300-3000 rev area . AFAIK overall gearing is exactly the same with GTS25Ts and 33GTRs and I reckon a well se up RB25 can probably make better low end torque than an RB26 and the GTS is a lighter car . These engines had different purposes but note the RB26 was designed to make power at revs more so than an RB25 .

Anyway as I said I don't race and I'm not after high rev or high speed power so what I have is fine at the moment . For a road car that gets driven like a road car it works well - for me .

A .

[JonnoHR31]

When I had a GT30 on a RB25 and then later a 25/30 the biggest improvement I made to transient response and low down torque was doing my own ignition tuning. I got it back from what is supposed to be one of the best tuners over here in Perth and whilst the tune was safe it was placid and useless off boost. I started playing around with it and wound in up to an extra 15-20 degrees of timing in some areas with great results. It improved throttle response, torque and fuel economy a lot more than you'd think possible. So if there's anyone with GT30s and other similar turbos and you're not happy with how it performs off boost I'd highly recommend spending some time getting the tune right, it really helps. Just another thing to consider.

[AngryRB]

^^^agree, i dont even need any boost to keep up with traffic, ethanol and a good tune with lots of timing

[Lithium]

I wonder if that's the problem, people only tuning properly for full boost - if you have a turbo that is full boost earlier/easier and both are tuned poorly everywhere but full boost then the difference between a GT-RS and a GT3076R would become quite large. I am assuming competent tuning when I comment on these things.

[Mick_o]

^^^agree, i dont even need any boost to keep up with traffic, ethanol and a good tune with lots of timing

+2 my car goes almost as good as my FG falcooon ute off boost!

[Lithium]

Well I dunno about an RB25s strengths Lith but the people who sold them used less turbo and not a whole lot of boost or intercooler exhaust etc .

They had a GTR as a flagship.... any thoughts why they didn't release that with a similar spec turbo to the R34 Neo RB25? Actually, don't bother answering- I am bored with this discussion and not interested in what comes back, you have been trolling GT30R threads for years and like writing big posts with your own theories more than considering others opinions and experience. I like these forums for learning (and helping others) and will freely admit I have learnt things from you (a long time ago) but here I feel like I'm throwing my voice at a vacuum.

You bring your car to Sydney and drive it in such a way that your RB25 makes decent use of its GT3076R and try and keep your licence

Have nothing to prove here. I drove my car with a GT3076R for 5 years never getting a ticket, never had a problem with lag, never had a warped manifold, made awesome noises everywhere, and undone a bunch of misconception a few people had readily absorbed from your on forum anti-GT30 propaganda once they actually experienced what a GT30R *ACTUALLY* drives like in person. From my point of view the only thing that gives your licence comment warrant is that the major real world difference between the GT3076R and GT-RS is the GT-RS can give "Oooo" acceleration while the GT3076R is more capable of "F&*K yeah!" acceleration, so a pretty silly comparison to be fair.

[discopotato03]

Yes you do have something to prove , show me how you can properly use that turbo without breaking the law on public roads . I'd say every time you really did the authorities were not there to enforce the law . If they had it may have been a case of F$$K , no licence and impounded car . Yey .

GTS25Ts and GTts have little to do with GTRs . Rs were a more limited production expensive and narrow focused car . Unique orphan in the world of production cars . The RWD Skylines were more conventional cars that almost certainly made Nissan more money at dealerships . You could argue that a factory standard GTS25T is no real ball of fire but has lots of potential , you even own or owned one .

Anyway to each their own , I don't have any interest in running people on public roads .

[AngryRB]

i vote for the F$$k yeah feeling.. but have grown eyes in the back of my head

[RS500]

Hi disco,

what are your thoughts on this turbo?

http://www.sonicperformance.com.au/774728/Garrett-GT3076R-Ball-Bearing-External-Wastegate-Required-%28V-Band-Flange%29/pd.php

i know it's the T04S comp wheel although it's a 52 trim.

how different (in the real world) would this be to the GT3076 (with 52T GT37 comp wheel)?

do you access to the comp flow map?

the reason i ask is b/c i have been offered this same turbo (with A/R .63 exhaust housing), with very low kms & very cheap.

just want to know whether it's really actually worth spending the extra $$$ on the 700382-5010

thanks.

[discopotato03]

It wouldn't be my first choice , its up to you if you think the price makes it attractive . Compared to a GT3037 type GT376R its going to be bulkier with that compressor housing and possibly a bit heavier . If you were going to hold out for the real 52T version do it because of transients and a possibly a slightly lower boost threshold otherwise the 56T one may bee more readily available and possibly a bit cheaper .

I'd also research the GTX3071R because they use a slightly more modern compressor and a port shrouded compressor housing . To me GTX wheels appear to be high pressure ratio wheels so probably good at making power at higher boost levels .

I'd like to see a 3073 HTA on an RB25 but you have to go to GT Pumps or FP to enquire about those .

I don't think any of these would be super responsive on a Cosworth YBB engine .

A .

[Checkbuzz]

Resurrecting this zomby one more time...

I think some people were interested in seeing this:

GT3076R 52T 0.82a/r IW dyno plot + original HKS GT-RS dyno

Both @19psi on the same dyno & same set up except; 4" intake, split dump and de-cat

Nuff said

[discopotato03]

Well mine finally (fingers crossed) goes on the rollers Monday and will be tuned on E70 or E85 . With a bit better intercooling and a fresh CAS it would be nice to see 260 or even a tad more , probably depends on how well the exhaust works .

I've tried to fix things that get tired on aging cars ie coils/loom/cas/pump as well as a few mild mods to make it breathe a bit more easily .

I didn't set out originally to run the high ethanol fuels but theres probably enough of it around now , mainly Eflex , to make it possible . Gary reckons it solves a lot of heat related problems and I'm with Corky Bell in thinking these are the main enemies to beat with forced induction .

So , the GTRS will be an interesting experiment and if this engine does really well particulartly at lowish revs I may try that 3076R 52T.

I'm almost sorry I opted for the 0.82 IW housing and if I could swap for new I probably would . My theory , thats all it is , is that the ethanol fuel burns cooler and possibly makes the exhaust gasses cooler / more dense / easier to get rid of for a given housing and exhaust system .

Mr Mafia did really well with his 0.63 housing and with a bit of smoothing in the passage it may be possible to make one a tad better .

Anyway thats down the track somewhere , cheers A .

[rondofj]

Has anyone done a comparison of the 3076R 0.82 against a Precision 5558 0.63 which is what I run now. I was torn between these two turbos and Yavuz from Unigroup told me they are more or less identical on RB25s but that the Precision does start to shine more on high boost which is what their strength is. The power delivery from the 0.63 5558 is also snappy when it comes on and not smooth /boring, that is what I wanted so I am happy.

Saying that if I had to do a street RB25 again I would go the 'peoples choice' which is the 3076R 0.82 just to try it out and knowing it is a winner.

[discopotato03]

Word from Insight is that the lil GTRS along with a few other mild mods on E70 cranked out 271 Kw at 18 pounds dropping to 15 .

Should have it back tomorrow , cheers A .