what is the wastegate function

[hamann]

hello,i'm interested in what the wastegate does.
we have been arguing with a friend and so
is it to limit the rpm of the turbo at a specifyed presure
or is it for when you release the gas pedal
or is it for something else?


p.s - is 1v an idi or a tdi engine???


thank you!!!

[jtanguay]

well the wastegate is factory set to open at 10 psi.  (when the turbo reaches this pressure, it opens the exhaust relief valve which limits the turbo rpm/boost)

as for the 1v, I have no clue.  Possibly IV? as in MKIV  that would be a TDI

[hamann]

thank you!

about the 1v - this is the engine code/of jetta '91 /

[lord_verminaard]

1v engine- 1.6 Turbo-Diesel, 91 and 92 German-made Jettas only.  60 hp, or 44 KW.    I think this was the Eco-Diesel, as the ME was N/A, the MF-TD was 70 hp.  

Brendan
84 Scirocco 8v
00 Camaro L36 M49

[racer_x]

hello,i'm interested in what the wastegate does.
we have been arguing with a friend and so
is it to limit the rpm of the turbo at a specifyed presure

A wastegate bypasses exhaust gas around the turbine. It's to limit the RPM of the turbo and to control boost in the intake charge.

or is it for when you release the gas pedal

In a gas powered engine with a turbocharger, there's another device called a blow off valve or diverter valve that is to limit pressure in the boost plumbing when the throttle plates close.  When you have the engine at full throttle and making full boost, the turbine and compressor wheel are spinning very fast and pumping lots of air through. When you suddenly let off the gas and the throttle plates close, the momentum of the turbine and compressor will keep packing air into the closed system. The pressure goes way up, and this puts a lot of pressure on the compressor wheel to slow it down. If things are spinning fast enough and the throttle closes quick enough, it's almost like sticking a screwdriver in the compressor and it can cause damage to the compressor wheel. The blow off valve limits pressure in that part of the intake tract and prevents damage to the compressor wheel from sudden throttle closings.

I think all the VW turbodiesels also have a pressure limiting valve on the intake, but that's mostly a safety feature in case the wastegate fails or the manifold overpressurizes for some reason.

or is it for something else?


p.s - is 1v an idi or a tdi engine???

Not sure, but I think the 1V is the 1.6L ECO diesel. A sort of wierd IDI turbodiesel made more for economy and ecological friendliness than power and performance. They had no aneroid on the pump, and a funky catalytic converter. Basically, all the complexity of a turbocharger plus some extra emissions stuff with all the power of a normally asthmatic IDI 1.6L.

thank you!!!

You're welcome.

[hamann]

thank you all - you were very helpful!!!


p.s - the jetta is made in germany :wink:

p.s2 - great forum guys - exactly what i need for tuning my jetta


p.s3 - greetings from europe

[autobahn]

I think all the VW turbodiesels also have a pressure limiting valve on the intake, but that's mostly a safety feature in case the wastegate fails or the manifold overpressurizes for some reason.

Would this be true for the AAZ? Do some people modding their TD's/TDI's install BOV's? If not, what is the difference that makes them unnesessary on these turbodiesels?

[QuickTD]

Would this be true for the AAZ? Do some people modding their TD's/TDI's install BOV's? If not, what is the difference that makes them unnesessary on these turbodiesels?

I think that by the 90's VW had made the wastegate pretty reliable, negating the need for a redundant system. The 1.9TD has a remote wastegate actuator that is very reliable. The swing valve wastegate itself runs on stainless bushings and never seizes, even on old junkyard engines. The 1.6TD turbo's have a wastegate actuator that mounts directly on the turbine housing. These are still pretty reliable but I have seen them rust up and stick if the car has sat for a long time.

[blackbird82]

no need for a bov in a diesel. because there is no throttle plate. that simple

[Vincent Waldon]

? Do some people modding their TD's/TDI's install BOV's?

99.999% of the time the reason someone tries to *add* a BOV to a VW TD or TDI is because they want the noise it makes that their friends have on their gasser turbos.

[lord_verminaard]

no need for a bov in a diesel. because there is no throttle plate. that simple

OMG 5 year old post bump!!!!  Back when I had my '84 Scirocco and my friggin' Camaro!!!

Brendan

[Smokey Eddy]

Hahahahhaha i didn't notice the post dates!!!
blackbird82, why did you reply to a 5 year old post?!?! hahahahah

[blackbird82]

5 years, 50 years. the reason for no BOV won't change.  Its just funny to see questions that silly asked!