Turbo Housing Swap

[BlackBox]

Hi,

My next set of modifications has me looking at 6 boost top mount twin scroll turbo manifolds,

With this i am also going to need to convert my current GT3076R internally gated to a twin scroll housing with no wastegate (For external wastegate)

My 34 is a streeter and i am aiming for 330Rwkw with headroom for the power bug

The current housing is .50 A/R this seems like a very low ratio, what should i be looking for to have street response but meet my power goal.

Ive also heard that i should use the biggest exhaust flange that will fit, i am having difficulty finding housings with T4 flange, will T3 be sufficient?

what else have i missed that i should be concidering?

I hope this all makes sense

Cheers

[Mick_o]

You will need a .70 compressor housing mate and I maybe wrong but I didn't know 6 boost does a split pulse T3? I think Tial do a stainless steel divided rear which you would want a .82.What fuel do you plan to run as 330kw is probably getting to the upper limits of its flow so doubt you will have too much head room for power.

[NYTSKY]

That is a very large expense for not much gain.

If you are going to spend the money and want that kind of power just buy a GT35R TS.

[Mick_o]

Agreed^^^ I made 336kw on the standard low mount manifold with a bolt on internally gated GTX3071R on E85. If you got e85 nearby upgrade your fuel system and re tune for porn juice. You stay looking stock under the bonnet and meet your power goal and if your setup is well sorted maybe squeeze in 350kw.

[BlackBox]

Thanks for the replies,

I thought that it might be starting to max out the 3076

Are you saying run the GT35 on the standard manifold or 6 boost? (I don't take stock looking under the bonnet as a good thing )

Oops just realised the .50 A/R is my compressor housing, not rear housing

Mick_o why do you say that i will need to change the compressor housing?

How laggy should i expect the GT35 to be when combined with a twin scroll manifold? (I was originally searching for better response/earlier boost)

And no E85 for me, only got pump 98 avalible

[NYTSKY]

It is a big cost to get maybe 400rpm response.

Manifold

2x gates

New lines

New dump

New intake

New housing

New tune

etc

If you are going to spend the money and want mid 300s a bigger turbo is needed so add that as well. You are looking at 8k+

[Mick_o]

A GT35R wouldn't fit on the stock manifold I woulda thought lol. When Mr po po puts his flashing lights on and wants to look under your bonnet looking stock would probably be quite appealing I woulda thought the lil .50 comp would choke but then again XR6's run them on GT35's

Wolverine has already tried picking up response with a twin scroll 3076 on his car and the gains were very minimal for the outlay.

[BlackBox]

Wow, i think 8k is a bit excessive i see your point, what then would you recommend as my next stage? (Mods are in signature + fuel pump and injectors etc..)

I was thinking turbo manifold and tomei poncams

[Mick_o]

Mate I dont think cams would help a great deal either maybe 10 -15kw max?? You are kinda at a crossroad with your setup as its pretty much maxed out on 98. If you want more now outta your setup E85 it (which isn't an option for you) or go for a bigger setup IMO but then that inroduces lag which clearly you're not a fan of lol

Id suggest shooting Stao from hypergear a pm and tell him what you're looking for

Edited July 28, 2013 by Mick_o

[Bennis]

290rwkw is pretty awesome man and will be a good compromise between response / streetability / power! The twin scroll gt3076r wont be worth it in the end, if you want to spend all that money fiddling about just sell it off and go for a newer technology turbo.

Ill bump the hta3076r. Search for it on here, its more responsive and makes more power than a standard gt3076r in any form (internal or external gate) and in non twin scroll t3. Just costs a bit more but sounds like money isnt too fussy if youre planning twinscroll , new manifold etc etc.

[Bennis]

ps 330rwkw is pretty rediculous for the street. my 33 makes it with a laggier gt3582r and Its impossible to give it a squirt without breaking the law dramatically haha. Im currently looking to go down to a gt3076r and less power for a more responsive and friendly drive.

[34GeeTeeTee]

Power doesn't make the car undrivable... Mine is so good to drive around daily and makes the power when needed... Clocked up 400kms today and loved it!!

I agree with a lot of the comments, a lot of expense for a return that will be good but nothing to rave about...

Hope you work it out...

[BlackBox]

Cheers for all the replies,

If more peak power is going to require a larger setup is there anything else i can add to my current set-up to have it come on earlier?

I should say that the 290Rwkw was made on the highest boost setting of 1.45Bar which i rarely run it at, and i only haven't done my own power run yet so i cant comment on how legit the dyno sheets supplied with the car are, i just feel like it needs more

[34GeeTeeTee]

Cheers for all the replies,

If more peak power is going to require a larger setup is there anything else i can add to my current set-up to have it come on earlier?

I should say that the 290Rwkw was made on the highest boost setting of 1.45Bar which i rarely run it at, and i only haven't done my own power run yet so i cant comment on how legit the dyno sheets supplied with the car are, i just feel like it needs more

You can copy the setup ANGRYRB is doing and do the twin scroll low mount setup which should make it come on hard BUT it's still a lot of cost to get there...

[AngryRB]

The TS T3 0.82 seems big enough for street driving, if a T4 is bigger then id not want the trade off in response.

Edited July 28, 2013 by AngryRB

[wolverine]

ATPturbo sell both a T3 and T4 footprint TS GT30 turbine housings.

Garrett also have one available now if memory serves.

You can get away with a single gate with TS, whilst not perfect it will do the job. Providing 6Boost make a decent wastegate port there should be little reversion.

[AngryRB]

wolverine- when did your ts hit full boost? did you think it was much better than single scroll?

[wolverine]

I changed from at GT3040 open 0.82 to a TS GT3076 ATP 0.82 so mine isn't a like for like comparison.

The new setup is better since it comes to life earlier but realistically for the money spent it probably wasn't worth changing something already on the car. A few hundred rpm on the street hardly makes any difference which is pretty much what I use mine for.

On a track though.....

[AngryRB]

Its probably been discussed before but im wondering wether the runners should have a smaller diameter as the 6boost manifold seems a lot larger at the collector than the t3 exhaust housing, I removed a lot of material to port match the two and if its made for 400kw+ then its obviously not outmatching the turbo's size and potential..

Edited July 29, 2013 by AngryRB

[BlackBox]

Re-reading over some of this, im going to be performing the 100,000k service soon so if i could pick up a set of type B cams for under 800 doesn't sound too bad as long as it isnt going to negatively affect my power curve.

Was also going to chuck in an adjustable EX cam gear while doing timing belt, although i have read mixed results. (But at ~$200 cant really complain at the gamble as long as it doesn't go backwards)