original fitment wastegate upgrade

[JP]

There are apparently some wastegates that are 30mm but I've never come across them personally.

Original flexi tapers down to around 25mm but would need to measure to double check.

When using a stock wastegate setup the main restriction is valve and seat. Next restriction is the stock flexi.

If fitting something like the 44mm wastegate setup that is on offer from 034 the restriction becomes the manifold.

I'm still using the stock flexi and getting no boost creep at 1.7/1.8bar running 574. However it does prevent me from running more boost along with a poor downpipe.

The idea of using a high flowing wastegate is to use it as a secondary flow path once peak boost is achieved and exhaust gases exceed what the hotside can handle allowing egt's to stay low at higher boost thresholds. Running a 60mm wastegate on a car that required a 44mm saw egt's drop from 980c to 820c measured at the exhaust ports with a 30hp gain as we were able to benefit from running more boost without excess backpressure.

Hth

[|Maku|]

There are apparently some wastegates that are 30mm but I've never come across them personally.

Original flexi tapers down to around 25mm but would need to measure to double check.

When using a stock wastegate setup the main restriction is valve and seat. Next restriction is the stock flexi.

If fitting something like the 44mm wastegate setup that is on offer from 034 the restriction becomes the manifold.

I'm still using the stock flexi and getting no boost creep at 1.7/1.8bar running 574. However it does prevent me from running more boost along with a poor downpipe.

The idea of using a high flowing wastegate is to use it as a secondary flow path once peak boost is achieved and exhaust gases exceed what the hotside can handle allowing egt's to stay low at higher boost thresholds. Running a 60mm wastegate on a car that required a 44mm saw egt's drop from 980c to 820c measured at the exhaust ports with a 30hp gain as we were able to benefit from running more boost without excess backpressure.

Hth

Okay, tnx! One option could be machining original or Wagner manifold wastegate outlet port from 38 to 44 mm and use 44 mm Tial wastegate? When I look at this picture (http://www.wagner-tuning.com/AUDI-S2...ange_p_36.html) there's enough room to do that.

[JP]

Yes

[JP]

The question is how much power you looking at running?

As I don't think a gt30 frame turbo will go much more than 600. As I'm achieving 574@1.7bar on stock ported wastegate and stock flexi I don't see why one would go to all the financial and time investment to try and go bigger wastegate?

[|Maku|]

The question is how much power you looking at running?

As I don't think a gt30 frame turbo will go much more than 600. As I'm achieving 574@1.7bar on stock ported wastegate and stock flexi I don't see why one would go to all the financial and time investment to try and go bigger wastegate?

Maybe because no one have tried it with car under 600 hp and proved its not worth to try?

[quattrofrank]

The original wastegate when in good condition is pretty good. I use it myself and is running around 595whp and up to 2,5bar boost. Not any issues with controlling the boost.

[Rocco]

hi again friends¡¡



TODAY was the first day testing my new rebuilt wastegate and now it works like it must

i had a lot of play in the axis and the valve so this is why i could not hold the boost .

i did the job in one good machine shop here by my village and i am glad for the moment.

i was a little worried because it could have problems with its tolerance but no... it works perfect¡¡

my boost gauge shows 1.9/2.0bar as peak and holding around 1.5bar at 7000rpm IIRC

stock engine,with 235000kms, spec stage 3+ clutch and around 9:1 CR,nice engine¡¡

[europeanme]

what spring are you using?

[Rocco]

what spring are you using?

tested both, the original first and the 0.9Bar one from ultimot

[europeanme]

tested both, the original first and the 0.9Bar one from ultimot

0.9 bar...seems a little low....what about the 2.0 bar from 034

[Jamo]

You do know that is absolute pressure so you get 1 bar boost with the 2 bar spring

[Rocco]

You do know that is absolute pressure so you get 1 bar boost with the 2 bar spring

yes true

the normal spring only charges normally 0.4 bar more or less