Turbo wastegates???

[Jake.VScommo]

Hey guys, most likely a stupid question but im in the process of buying a new turbo for my vl, im gettin a standard t3/t4 but was wondering the difference between internal and external wastegates and wat would be more preferable and also if a highflow turbo is better and the differences? Very appreciated guys

[nasty1]

hi flow is the way to go.

internaly gated wastegates are legal

[Pub247]

External gates are better no doubt about it they aloow for higher turbine flow and higher potential power outputs.

One thing to remember is that a decent wastegate cost about $800 so if your thinking of buying a turbo consider factoring in the extra expense if looking at external gated turbo's

[detox_nath83]

well said... hahah get a wastegate for about $400 and hide it... better with an external being a t3/t4 turbo not many really are internal gated anyways.

[dirt drifter]

internal wastegate is in the turbine housing and works with your stock turbo manifold, at what power it's better to go external i dunno.

external gate mounts to a pipe coming off the manifold before the turbo to bleed off the excess boost, dunno if u can weld one onto your stock manifold or have to go out and buy a whole new manifold. then it would be a good idea to have the pipe out of the external gate plumbed back into the turbos dump pipe anywhere before the cat. you could have the pipe out the wastegate dumping straight to the atmosphere. this is a "screamer pipe" because when the gate cracks, well.. if you've heard one u will know why!

i recommend plumbing the wastegate back into the dump pipe because i would hate to get done with a screamer, its exhaust gas does not go thru the cat and the epa will have a fit

[Pub247]

You can get pipes welded for external gate on stock manifold but for the price of an ebay cheapo manifold id buy one of them instead. When it comes to wastegate the ideal situation is not to introduce back into the exhaust stream this isnt ideal in real world there are a lot of do's and don'ts and math involed but suffice to say 40cm and the best possible angle of exhaust re-introduction is the minmum requirement for any decent setup.

Problem with internal gates is at a certain point they become a restriction power loss in one of 2 ways. 1 they cant hold back boost pressure and start to creep (hence the term wastegate creep) open releasing pressure. 2 they cant vent enough exhaust gas and you start getting boost spikes or overboosting. Another issue they ruin the flow from the turbine which limits theyre potential for spoolage and outright power and response

Detox nath is right you can pick up a decent 2nd hand gate for $400 mate got a turbosmart 48mm progate for that.

[detox_nath83]

i have got my external gate screamer plumbed in right b4 the cat literally right at the flange so minimal turbulence is achieved when the gate opens.

[cracker]

any external gate is illegal in vic, so may as well be a screamer, as for plumbing it in before the cat... yeah if it had one i would...actually no i wouldnt.
if its a basic set up keep it internal, and nice and normal

[Jake.VScommo]

Ok cheers for help guys, so now my brain just turned on, the internal is that zutututu sound u get through the pod filter and an external is a blow off valve. And yes ive seen a stainless highmount manifold with a 50mm wastegate port on ebay mite be the go ay. So is it true with the wastegate thing on the manifold, i can either put a bov on it or a sceamer? True? And yes i think ill be goin a high flow Turbo

[Jake.VScommo]

Im new to vl's and turbos lol

[AirStrike]

any external gate is illegal in vic, so may as well be a screamer, as for plumbing it in before the cat... yeah if it had one i would...actually no i wouldnt.
if its a basic set up keep it internal, and nice and normal

Why would an external gate be illegal? As long as it is plumbed into the exhaust system there is no difference in noise or pollution to that of an internal. Do you have a source for this?

[Pub247]

Who cares putting a bigger turbo on is illegal running an altered ecu is illegal, cams, headers exhausts, supercharger lowering, big rims, tyres to wide it doesnt matter what you do if the police want to defect you they'll find a reason you might as well go all out

[Pub247]

Ok cheers for help guys, so now my brain just turned on, the internal is that zutututu sound u get through the pod filter and an external is a blow off valve. And yes ive seen a stainless highmount manifold with a 50mm wastegate port on ebay mite be the go ay. So is it true with the wastegate thing on the manifold, i can either put a bov on it or a sceamer? True? And yes i think ill be goin a high flow Turbo

NO wastegates control boost pressure blow of valves and dosing are 2 completely different things. to put it in laman's terms. Wastegates release pressure in your exhaust manifold blow off valve release pressure in your intake system. Blow off valves is another thing you dont really need uness you dont want to the dose noise in your car

[dirt drifter]

what he said^^^^^. the zutututu sound is from the blow off valve. its the air in your inlet pipe that has nowhere to go due to to throttle closing, it goes out the blow off valve

[Jake.VScommo]

Ok ok. So an external wastegate will be more preferable? And the port on the manifold can be used for either a screamer or a bov true?

[dirt drifter]

bov is on the inlet pipe before the throttle body, screamer pipe comes off your external gate which is on your exhaust manifold, no bov there

[GlenM]

what he said^^^^^. the zutututu sound is from the blow off valve. its the air in your inlet pipe that has nowhere to go due to to throttle closing, it goes out the blow off valve

Zutzutzutuzt etc is the turbo compressor vanes aerodynamically stalling/surging. As the throttle closes the velocity of air through the turbo changes, thus changing the angle of attack of the vanes. Generally caused by having the blow arse valve set too firm.

[VL_5SPEED]

Lets clear this up.
The zutututu noise is from NOT having a blow off valve. A blow off valve bypassses the zututututu noise. Both the zutututu noise (dose, flutter) and blow off valves (chhhhhhhhh) are wank factors. A blow off valve is only needed when running big boost. Now a external gate should never be plumbed back in, they sound awesome and scare the shit out of people.

Heres a pic of my external wastegate on stock manifold. R.i.p My stolen wagon

[Pub247]

Blow off valves is another thing you dont really need uness you dont want to the dose noise in your car

Lets clear this up.
The zutututu noise is from NOT having a blow off valve. A blow off valve bypassses the zututututu noise. Both the zutututu noise (dose, flutter) and blow off valves (chhhhhhhhh) are wank factors. A blow off valve is only needed when running big boost. Now a external gate should never be plumbed back in, they sound awesome and scare the shit out of people.

Heres a pic of my external wastegate on stock manifold. R.i.p My stolen wagon

I did say something similar to that that effect maybe i should have went into more detail but you've said it well enough

[Jake.VScommo]

Sorry about ur wagon mate my old vn wagon got stolen from my backyard it sucks. On ebay there is a kit that includes a t3/t70 turbo with a stainless manifold and a weird thing that bolts to the external gate on the manifold, what would that be?

[aussie_macca]

HUGE!!!! T70 TURBO VL RB30 MANIFOLD 50MM WASTEGATE KIT | eBay

is this the kit you mean?? the first BIG pic just under where it says "MonstA T70 800HP TURBO / VL RB30 TURBO MANIFOLD / MonstA 50MM WASTEGATE"
has the POS turbo at the bottom with the stainless manifold in the middle and the POS wastegate bolted on up the top

[Pub247]

HUGE!!!! T70 TURBO VL RB30 MANIFOLD 50MM WASTEGATE KIT | eBay

is this the kit you mean?? the first BIG pic just under where it says "MonstA T70 800HP TURBO / VL RB30 TURBO MANIFOLD / MonstA 50MM WASTEGATE"
has the POS turbo at the bottom with the stainless manifold in the middle and the POS wastegate bolted on up the top

You get what you pay for.....

[aussie_macca]

agreed.which is why i made sure to mention that its a piece of shit turbo and a piece of shit wastegate.

[Jake.VScommo]

hahaha fair enough. so i shouldnt get that? i gotta find myself as set up like it but dont know where to go. would the manifold be ok to buy? then i could just find a good garrat turbo and a wastegate possibly

[Pub247]

Yeah those manifolds are goodsome people say theyre crap but in reality there just as good as say snort performance ones yet yet like 1 tenth the price you got to make a few cuts in flange to allow for warpage but other than than you couldnt buy the flange for a $100.

35/49 your looking about 1400-2500 new depending where you buy and whether its internal or externally gated. Like above decent wastgate is like 400-900 dpepending on brand size new or used