Author Topic: Bosch recirc valve  (Read 3354 times)

Offline cheys03

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Bosch recirc valve
« on: September 12, 2010, 06:02:06 pm »
I've bought a used VW/Audi recirv valve, part number 034 145 710 C which I believe is reasonably commonly used with G40 turbo conversions. It's the same as in the photo below pinched from an American Audi site.



The valve doesn't appear to operate as I would expect, but would like to make sure I'm not misunderstanding the valve before condemning it...

If I suck on the vacuum line then it will suck air through the 'pressurized air dump in'. When connecting the valve to a vacuum line on my engine it won't open, but when the valve is gently pushed open through 'pressurized air dump out' the vacuum will hold the valve open.

I suspect the diaphram between the vacuum side and the boost side of the valve is shot, but looking for confirmation please chaps. Cheers.

Offline cheys03

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Re: Bosch recirc valve
« Reply #1 on: September 15, 2010, 10:28:43 pm »
Yup, fooked seal





Looks like it's torn (no I've not sawn into it!) where it is folded and sealed under the cap. Damn nuisance.

Offline Robin

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Re: Bosch recirc valve
« Reply #2 on: September 15, 2010, 10:52:03 pm »
these dump valves are crap, they don't last long as the rubber easily splits, i have about 5 of them in the boot of the car as spares, they don't last long with 22psi of boosts!

Offline cheys03

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Re: Bosch recirc valve
« Reply #3 on: September 15, 2010, 10:56:45 pm »
Duly noted!  :D

Offline hayesey

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Re: Bosch recirc valve
« Reply #4 on: September 16, 2010, 09:12:05 am »
yeah I had one pop on me half way through a track day.  Ran the rest of the day with a screwdriver handle shoved into the dump valve hole :D

Offline vwmk3jon

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Re: Bosch recirc valve
« Reply #5 on: February 13, 2011, 07:26:38 pm »
Wont buy one of those then! Lol

Offline Doc J

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Re: Bosch recirc valve
« Reply #6 on: February 14, 2011, 12:32:23 am »
My opinion - GReddy Type S insted of the Bosch one - good recirc dump valve, hard to appear damage on it ;)



Negatives - may be too big valve diameter (35mm insted of the 24mm in Bosch one) and the price of it!
« Last Edit: February 14, 2011, 12:40:34 am by Doc J »

Offline hayesey

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Re: Bosch recirc valve
« Reply #7 on: February 14, 2011, 09:47:24 am »
Tial make some nice ones too.  Although I'm currently using a right chavvy one that a mate found in his shed, I think it was used on an escort rs turbo, it's anodised bright blue and makes a right racket but it's not blown up yet.  I might save some pennies for a nice Tial one though!