Turbochargers Explained: The Wastegate
Dec 16, 2003 | By: Matyas Varga - SRO

40mm External Wastegate



Without a wastegate, the amount of boost that a turbocharger creates
varies with the pressure of the engine's exhaust. This happens because
exhaust pressure varies with relation to the engine's speed (measured
in RPM's). This implies that as an engine reaches higher RPM's,
increasing amounts of boost will be created by the turbocharger. The
problem with this is that an engine can only accomodate a given amount
of boost. Most stock engines are only meant to take about 10 PSI if not
less. In order to regulate the amount of boost that comes into the
engine, a wastegate acts as a door only allowing a given amount of
exhaust to hit the turbocharger's exhaust turbine. Once the engine
starts producing more exhaust pressure then the wastegate system will
allow, a flap is opened to redirect excess exhaust away from the
turbine blades. In turn, this is where a wastegate gets it's name. It's
a gate to carry away waste. In order to regulate when a wastegate
opens, a boost conroller can be used.

Internal Wastegate Assembly and Actuator



There are two types of wastegates. The first one is an internal
wastegate (right). An internal wastegate is a component on the turbo
unit itself. The gate is opened via an actuator which is a diaphram
type system (see left picture). Excess exhaust is then fed directly
into the exhaust system. We also have what is called an external
wastegate (left), unlike an internal wastegate, it is seperate from the
turbo unit and does not require an actuator. Excess exhaust can either
be fed into the exhaust system or it can be vented straight out and
into the atmosphere. High performance set-ups typically follow the
latter alternative. Most stock systems come with an internal wastegate
as this set-up is better suited for low boost applications. However
most aftermarket systems perform better with an seperate external
wastegate assembly making it an ideal choice for those generating boost
in the range of 20-30 PSI.

Apa fungsi sebenar wastegate ni ?
Ingin tahu. Untuk Kcar brapa MM yg sesuai?

selagi internal tu boleh support boost tinggi x payah pakai external wastegate pon x pa... external ni selalunya yg boost 2 bar ke atas....

bah..jgn kasih lama. sumbat terus twin turbo.

nice info bro blugu...
x mampu pakai wastegate pakai down/dump pipe (wesget kampung) pun jadi lah..huhu..

sa hanya mampu internal saja, boost hanya 1.6 bar saja...

ceh, 1.6bar?? saja lagi tu ko ckp..kekeke..jgn la rendah diri bro pioneer..utk aku yg lidud 1.6bar tu tggi sdh tu.. huhu...

1.6 bar ka??? Buli2 suda tu tau

1.6???mati....aku pun 0.5 saja....huhu....

pakai remove ni..utk k-car sesuai 30mm-38mm...cari spring yg licak/lembut la supaya kalu yg pakai boost rendah leh lagi rasa power wastegate ni..
yg 44mm ni besa yg hi-boost ja...keta aku pun pakai yg 35mm...

terpulang pada citarasa pengguna.. mau lagi sedap bunyi teriak aku cadangkan ext w/gate.. muahahaha... internal gate pun ok..

yang goodnya ext w/gate ni, boost steady all da way.. asal jangan bocor la.. agree sama kelisa hitachi, kcar > 30-38mm punya saiz ok suda.. aku pakai 38mm punya, suda pakai 3 tahun, masi ok tapi mau bucur2 suda..

sy punya wastegate 38mm tp spring dlm dia macam 1 bar saja.. baru rpm 3 stgh..teriak suda wastegate..nda syok ni.. mau cari spring yg 2 bar punya ni..hehe!

bro fungsi westegate sama macam blowoffkah..?..

blow off ko lepas dia bunyi, kalau w'gate ko tekan sampai full boost baru dia bunyi, makin tinggi boost makin kuat bunyi dia, selagi x full boost dia x bunyi itu w'gate.

pioneer_syntium wrote:

blow off ko lepas dia bunyi, kalau w'gate ko tekan sampai full boost baru dia bunyi, makin tinggi boost makin kuat bunyi dia, selagi x full boost dia x bunyi itu w'gate.

tompinai...diesel turbo..buli psg wastegate ka...tq

klu turbo diesel enjin standed bighorn isuzu buli pkai ka????berpa mm yg terbaik....boost pun bru 0.5 klu x silap/...tlg2 tnya tuk kawan jk ni....

yoreel wrote:

pioneer_syntium wrote:

blow off ko lepas dia bunyi, kalau w'gate ko tekan sampai full boost baru dia bunyi, makin tinggi boost makin kuat bunyi dia, selagi x full boost dia x bunyi itu w'gate.

tompinai...diesel turbo..buli psg wastegate ka...tq

buli..xda masalah..modfied 2 fuel pump tuk jek boost tggi..kompom berteriak 2 wastegate..kwnku ada modified dia pnya triton lite p turbo..wastegate msti yg ori..klu x bocor 2 klu boost tggi..

tu dia bila otai2 da besuara....
kongsi2 lg ilmu....

dmax buleh kac msk ka tu brg..
wastgte JAsma tu oK ka..?
ada tjmp mrah ari tu..
tp x tau kt mna nk psg d kk ne..
org bru bha..
hehhe

takut tidak tahan jak tu westgate.yg buatan siam pun ok....
jasma brand ni buatan mana arrr??????

beli ja tial ori bh..USA mari..tp pastikan yg ori..harga pasaran rm1k - rm1.2k..

jasma jpun pny buatan..
dgr2 ok bha..
tp x tau la lau ada yg nda ori..
hehhe

brand malaysia "ZAP" pun ok bro..murah2 je

macam mna kita mau tau wastegate tu bcor ar..takut jgk ni dgr2.

turbo boost yg slama ni steady - jadi tidak steady, kena cek blow valve & waste gate kalau lain² tempat nda bocor.