Got A 3076r - Just A Conclusion

[WYTSKY]

My bad, which bit did I worry you with? In terms of wastegate placement I just warned you off one way and recommended two better ones - off the turbine housing is near the best setup you could do, so long as you're not too vain.

The only thing I'd be worried about is .63a/r hot side on an NA motor, you're potentially going to be quite timing limited.

Thats alright, i dont think i would mount it off the housing, i am a little vain , but ill talk to trent aswell, see what he thinks, the only difference is about 2-3weeks...ie... if i can get away with using modified stock manifold then it could be on much sooner, but if i need to get the hks, will take a few weeks of saving!

Interms of limited timing... dont know, u may be right. have to wait and see.

I've got one with a HKS cast low mount, good turbo, bit lazy at 270rwkw though.

They have good potential to for +300, but you need a built motor, head gasket, or WMI to eliminate knock. But I like the headroom, lets you play and progress the power without having to change turbo's too soon. Only change I would have made was to the larger 0.82 exhaust side, the 0.63 may be more responsive, but it is also more restrictive - you loose your headroom.

mmm, well i just thought as I dont have either of those 3 yet, and I want response, why not go the .63 for now, then in the future the .82 if needed....

Thanks for the continued help guys!

[Lithium]

May be worth seeing what others think, but I strongly recommend against mounting off the exhaust manifold - for a start it is at odds with your vanity claim but its generally the worst option you could go for. You know the factory manifold is divided in design?

[WYTSKY]

thanks mate, I have seen some clean jobs so the vanity is saved, but i am not too familiar with it's design as such.

im sure most will say aftermarket one, in which case I would get one for piece of mind.

Cheers.

[Lithium]

Nice Wish I had too. Good luck with it, will be good to see how it comes out and welcome to the GT3076R family haha

[GT-RZ]

what do you guys think about this turbo with the .82 rear on a 26/30??? only want about 350rwkw and was originally going to go 35r but if this can provide the same and with more response i'm leaning towards it...

twin scroll t04z is still in the mist though.

[dori34]

oh my, good work on the turbo upgrade adam, you're car is gonna be heaps crazy!

are you still planning to keep the bottom end DE or are you in the process of rebuilding it as we speak?

[Lithium]

what do you guys think about this turbo with the .82 rear on a 26/30??? only want about 350rwkw and was originally going to go 35r but if this can provide the same and with more response i'm leaning towards it...

twin scroll t04z is still in the mist though.

I don't really think too much of it, I'd go no smaller than a GT3582R on a 3litre to be honest. A twin scroll GT3582R wouldn't go amiss though!

[Tangles]

sort of on the topic of the thread, but im wondering how on earth do i make the 3076r not as loud when spooling, its giving me the shits and sounds pretty annoying (that sounds only good on a 450rwkw setup not a 280rwkw one haha), its on an rb30 and its whistling its head off at under 2000rpm on normal acceleration when driving in traffic.

hey mate, Id suggest a cple of things.

- tomei poncams, 'cause I love em so much. Would enable you to drive around off boost more. a tad extreme.

- more likely tho is to have a thick metal intake pipe, like manifold-thickness, leading from a cai/pod/z32afm into the turbo intake. nice and thick.

- try using stock airbox with highflow panel filter in lieu of pod, with thick metal intake pipe. might be quieter than your pod.

I get plenty of whoosh but no whistle.

[GT-RZ]

I don't really think too much of it, I'd go no smaller than a GT3582R on a 3litre to be honest. A twin scroll GT3582R wouldn't go amiss though!

yea if i go gt35 i think i'll give the 1.0 rear housing a whirl and make the most of it. i'll have to look see what's available in twin scroll.

[juggernaut1]

1.06 available in twin scroll for GT35

[dori34]

ps adam, i mounted my gate off the rear housing, no problems holding boost, flat boost like all the way to redline with a turboXS bleeder.

[Lithium]

1.06 available in twin scroll for GT35

Yep one of those would be awesome on an Rb30 I reckon

[wolverine]

yea if i go gt35 i think i'll give the 1.0 rear housing a whirl and make the most of it. i'll have to look see what's available in twin scroll.

ATPturbo.com have a .78 divided housing as an option.

[juggernaut1]

Sorry, but to clarify that is a 1.06 twin scroll in a T4 size - not T3.

T3 .78 IMO would be too small for a 2.5 litre especially with a GT35. IMO the .78 is just marginal with a 3076 on a SR.

Twin scroll ex housings seem to need more ex a/r so they don't fall over in the upper rpm range. Thankfully they have less lag induced from using larger twin scroll housings than compared to their open housings counterparts.

Edited August 27, 2009 by juggernaut1

[GT-RZ]

1.06 available in twin scroll for GT35

Yep one of those would be awesome on an Rb30 I reckon

i think the 1.06 twin scroll GT35 may be the goer then... i just need to find a lowmount split pulse manifold for rb26 now! did i see once that HKS made a cast one? that would be perfect!

Edited August 27, 2009 by GT-RZ

[discopotato03]

The GT3076R family is getting larger isn't it ?

I think you're going to find the TS 1.06 AR turbine housings for GT3582R's are the larger T4 International sized mounting flange . Geoff did reckon Garrett was looking at a TS "T3" flanged version but none available yet . Your getting into a grey area with a housing that size and the T3 flange because the ports need to be larger than that flange has room for .

The Single Scroll ones don't have the port divider and just about maximise the area the T3 flange has .

I have opinions on larger housing sizes and GT3076R's vs GT3582R's but they're not based on real world experience .

If I had a GT3076R and did the RB30 upgrade I wouldn't be in any great hurry to reach for a GT3582R . I think this is a situation where you can look directly at the compressor ends capacity of a GT3076R and say yes I want more air or no 540 hp's worth is enough .

Don't forget that the GT30 turbine has more in it than it's native 0.82 AR turbine housing can support so if you don't realistically need 600+ horse powers worth of air then I think the GT3582R is a bit too much .

Like I've said in the past a GT3076R with a 1.06 AR turbine housing is about the same maximum exhaust gas flow as a GT3582R with a 0.82 AR turbine housing - ~ 27 corrected lbs exhaust gas/min .

Using the force here again .

A reasonably big engine like an RB30 twin cam is going to make quite reasonable torque without positive inlet manifold pressure , particularly if it breathes well and doesn't have 7 to 1 CR . Off boost it's going to prefer a larger turbine housing because less restriction means better breathing and the opportunity to give it as much ignition timing as it can productively use . Free revving + good consumption etc etc . Cubes here runs a GT3076R 0.82 AR on his RB30 DOHC and I think reckons it makes positive inlet manifold pressure at 1500 + engine revs . If it were me I'd think seriously about using the next size up or 1.06 AR GT30 turbine housing and possibly getting positive pressure at maybe 2500 engine revs , still not real high by my crystal balls standards .

An RB30's going to get a GT3076R going earlier in the 1.06 housing than it would a GT3582R in a 1.06 housing . It has to because the GT30 turbine is about 8mm smaller than the GT35 one and its driving a 76.2mm compressor rather than an 82mm one .

I personally think the GT3582R is using bored out GT30 housings and your not going to get all a GT35 turbine can give in those GT30 turbine housings . Serious people overseas don't think much of GT3582R's until they put larger T4 flanged turbine housings on them - mainly twin scroll ones . Diesel GT35R's use big GT40 family turbine housings , actually GT40 compressor housings as well which doesn't say much for the GT3582R's T04S compressor housing - with the 82mm GT40 compressor .

Changing a turbine housing is always cheaper and easier than changing turbos because in this case you don't need to alter anything else . The GT3582R uses a physically larger compressor housing and a half inch larger outlet barb so more plumbing work .

Usually in GT3582R discussions BB T04R's (T04Z) get a mention and they have their place but .

If you could fit adequate size housings (both) on a GT3582R I reckon the gap in performance between the two would close right up . The thing is that by the time you got a 35R to that stage you've probably spent GT4088R money anyway and it's a better thing IMO on an RB30 twin cam - a serious one .

Anyway from what I can tell the 82 housing on a GT3076R is more than adequate for a warmed over RB25DET but on an RB30 I'd opt for the 1.06 one .

For a bit more response with a GT3076R on an RB25 I think the way is to use smaller compressor trim versions , than the usual 56T one , if you can find them . The options were 48/52/56T compressors in the GT3076R/3037 76.2mm group .

I in theory have a GT3076R/3037S 52 comp trim cartridge at Garrett's waiting for its matching port shrouded compressor housing to turn up and will post pics when they do .

By the CHRA and turbo assembly numbers it is what I've asked for and assuming it is then the only other GT3076R/3037 option , the 48 comp trim one , is still to be found .

According to my listings the 3037 was available in 48 compt trim and the cartridge number was I think 700177-5 , turbo number 700382-8 . I believe it had the non port shrouded version of the T04E 0.60 AR compressor housing , I think I have a pic of one somewhere .

Again using the force but my gut feeling is that it would have been a better all round thing than the real GT3076R and the only external difference would be the 60 AR T04E comp housing vs the 50 AR one and the std 70mm inlet boss vs the 3071R's 100mm one .

Looking into these 48T ones as well , cheers A .

Edited August 27, 2009 by discopotato03

[GT-RZ]

Nice read.

So you did mention that the gt35 with the 1.06 twin scroll rear housing is a good thing? Or do you think for my target power 350kw+

a GT30 with the 1.06 housing is a better option (is that available in twin scroll too?) i dido't quite understand if it's exactly the same rear housing that the gt35 uses.

cheers

[WYTSKY]

oh my, good work on the turbo upgrade adam, you're car is gonna be heaps crazy!

are you still planning to keep the bottom end DE or are you in the process of rebuilding it as we speak?

[juggernaut1]

Nice read.

So you did mention that the gt35 with the 1.06 twin scroll rear housing is a good thing? Or do you think for my target power 350kw+

a GT30 with the 1.06 housing is a better option (is that available in twin scroll too?) i dido't quite understand if it's exactly the same rear housing that the gt35 uses.

cheers

Its a very good thing. 2.5 litre subi's are making very good power and torque with these on i.e. 442 lb at 4133rpm and 496 hp at 6569 rpm on a dynapck - so an RB could only be better.

Check this out re the subi.

http://www.iwsti.com/forums/2-5-liter-litr...out-5-24-a.html

and GT35 1.06 T4 TS housing in the flesh

http://www.freshalloy.com/forums/showthread.php?t=186058

Edited August 27, 2009 by juggernaut1

[Lithium]

Disco: Its interesting you say that people don't think of the GT35Rs as much without the T4 flanges, I see they don't appear to be that popular in Oz but my impression is that around the world the GT3582R is quite a popular thing and its following is definitely not losing any steam - as evidenced by people now releasing twin scroll turbine housings for the CHRAs and people like Forced Performance etcs forays into trying to optimise them by putting bigger compressor wheels or smaller trim wheels to try and improve their balance ending up more trouble than they are worth.

I am of the opinion that once you hit a .82a/r GT30R setup's limit then its time to move on to a GT35R. I have seen tests and/or opinions on other forums which indicate people find a twin scroll T4 GT35R spools comparably with a .82a/r GT3076R - which even is a bit optimistic indicates to me than a 1.06 a/r single entry GT30R and a T4 TS GT35R would probably be very comparable. When you are talking a 3litre engine, the large improvement in turbine flow in itself has to be reason enough to consider the GT35R I would have thought? You yourself I am pretty sure advocate the split pulse advantages, or are you suggesting there should be a 1.06a/r T4 split pulse option for the GT30R?

That would be pretty cool I guess, but a 1.06 a/r single entry GT3076R sounds like a silly thing to me - especially for someone talking about 350+wkw. Sure people here have hit that figure with them on E85, but really its gotta be leaning on them a bit.

Edited August 27, 2009 by Lithium