External Wastegate Size For Gt3076R?

[Badgaz]

Hi Everyone,

I've decided that a GT3076r or ATR43SS2 will be what will make my setup complete....i'll be happy with anywhere between 250kw-300kw.

my question is this, i have no idea what would be the ideal sized external wastegate... i want to limit exhaust or manifold modififications so was looking for a 0.82 rear housing with the flange for the wastegate and utilizing a vband clamp of the rear.

any suggestions or advice on the size?

cheers

Gaz

[Aggroman]

44mm will do just fine

[Ben C34]

Seeing as an internal gate can control the boost no worries with that turbo, I don't think you could get an external gate small enough to not work.

[Badgaz]

preferred brands?

[Ben C34]

Turbosmart because Aussie.

[iruvyouskyrine]

Turbosmart or TiAL. Preferably the first because as Superben said, Aussie made.

[Badgaz]

what spring do most people run?

[zebra]

As close to your target boost as possible

[iruvyouskyrine]

Turbosmarts come with either 7 or 14psi springs standard, then you buy other springs to get your desired boost pressure.

Also it might sound simple but i have no idea how technically minded you are. Make sure you buy springs that equal slightly less than your desired pressure, as you cannot run less boost that the wastegate spring pressure.

[steve200b]

I ran an internal gate on my gtx3076r holding 18 psi flat line but 22psi needed a external gate to control it. Now I have a tial 44mm of the housing

[Badgaz]

Turbosmarts come with either 7 or 14psi springs standard, then you buy other springs to get your desired boost pressure.

Also it might sound simple but i have no idea how technically minded you are. Make sure you buy springs that equal slightly less than your desired pressure, as you cannot run less boost that the wastegate spring pressure.

yeah i did know this...i still like to be able to turn my boost down when i have to leave it anywhere.

[Badgaz]

I ran an internal gate on my gtx3076r holding 18 psi flat line but 22psi needed a external gate to control it. Now I have a tial 44mm of the housing

i'm running 18psi at the moment....i'm not sure i'd push more boost on my old block (300,000km)

[zebra]

Boost doesn't equal air flow.

"Boost" is in tge intake manifold. Not the combustion chamber

[Badgaz]

umm what do you mean by that? yes air pressure does not equal air flow.

[Ben C34]

He means running a certain boost level doesn't mean a motor will be safe or explode.

[Ben C34]

Too much boost.......

Danger to manifold!

[Dose Pipe Sutututu]

I use a 45mm Turbosmart Hypergate off a Hypergear SS2, happily runs 0.5 bar all the way to 1.2 bar and holds to red line.

Will be dialling in 1.5 bar once I get my injectors sorted out, right now stock injectors are hitting 92%... great spray pattern haha

[Badgaz]

He means running a certain boost level doesn't mean a motor will be safe or explode.

yes i know that.

[scotty nm35]

The Hypergear is an internal gate housing, probably best if you buy a suitable external gate housing and get Stao to machine that to suit his turbine wheel if you are heading down that path.

With the GT3076 you can buy Vband housings for them cheap off Kinugawa, ship it to me and I can weld the gate to it. (unless you can find a decent fabricator locally, but you will need to take the car there.)

The Turbosmart gates are great and will hold over 45psi these days since the HP caps were released, but i assume you are sticking to 98... I would be running e85 for engine protection if you are worried about longevity