944 Dump Valve

[Guest]

Hi All,
Can anyone recommend a dump valve for my 1990 944 as the Bosch one is faulty ?
Thanks,
PS the pic is of my first 944 (A 1986 lux) not my turbo.

 

[Fen]

Saab 9000 Turbo valve; looks the same as standard but has a metal diaphragm and a stronger spring. Costs £30 from Saab.

 

[John Sims]

I've a nice blue anodised recirc' dump valve sitting in my spares box after I changed to a non recirc. You'd be most welcome to that for a nominal sum.

 

[Diver944]

The Saab one that Fen mentioned is the exact same one that Porsche now use for the 944 if you'd feel more comfortable with a Porsche box (its the same part as a 993 Twin Turbo). You'll pay more though [] mine cost me £38 inc vat from Silverstone Porsche

 

[Guest]

ORIGINAL: Diver944

The Saab one that Fen mentioned is the exact same one that Porsche now use for the 944 if you'd feel more comfortable with a Porsche box (its the same part as a 993 Twin Turbo). You'll pay more though [] mine cost me £38 inc vat from Silverstone Porsche

Being a Scotsman i got the Saab one, £22.69 []

 

[944turboS]

Can somebody tell me the saab part number as my local dealer says they are the standard black plastic Bosch items.
John if Simon does not take up your offer I may be interested in your spare valve.

 

[Fen]

They are the standard black plastic Bosch ones, but the insides are better than the original 944T versions.

I think Slim posted the part number on here about a year ago, search might find it.

 

[Guest]

Thanks for the replies !
I was also thinking along the lines of a non recurculating type.

My new steed is a 1990 Turbo in Panther black (I think) 17" cup alloys (Wish i'd kept the coloured crest centres from my lux). It has a Haward and Scott stainless exhaust and the black leather trim. High milage but loads of history(Mainly from Harteck)

Only mechanical problem i've had was a faulty throttle position sensor, oh- and trying to keep within the speed limits.
Quite a different animal to the Lux !!!

 

[John Sims]

I was also thinking along the lines of a non recurculating type.

There is a line of thought that says you shouldn't use a non-recirculating dump valve, on a standard metered turbo, as you are exhausting air that has gone through the air flow meter. The air through the AFM will result in the appropriate amount of fuel delivered through the injectors. If you vent the air, you will allow more air to enter the system which will deliver more fuel than you would otherwise need.

On the other hand - You could argue that the air passed through the dump valve is out of synch with the metering anyway, having done a circuit of the inlet system, and venting it will allow more air (and hence fuel) in and avoid running lean as you re-boost.

If you have changed your AFM for a MAP metering system you can do what you like with the dumped air - and that "GUUOOOSHHHH" sound is very satisfying [8D]- Some may argue that it is the "Chav side of chav" but we just ignor such uneducated comments. []

 

[Fen]

Disregarding Chavness it still sounds like a bus IMO.

 

[Guest]

ORIGINAL: John Sims

I was also thinking along the lines of a non recurculating type.

If you have changed your AFM for a MAP metering system you can do what you like with the dumped air - and that "GUUOOOSHHHH" sound is very satisfying [8D]- Some may argue that it is the "Chav side of chav" but we just ignor such uneducated comments. []

So when is Beaky getting the Burberry top coad [8D]

 

[John Sims]

So when is Beaky getting the Burberry top coad

Linen Porsche Logo cloth is the new Burberry - you heard it here first, trust me I'm a designer.

I wondered about under car neons but Beaky is so low you wouldn't see them.


Edited 'cos I can't spell.

 

[John Sims]

Disregarding Chavness it still sounds like a bus IMO.

You're only jealous 'cos you can't do it with MAF. []

 

[Diver944]

ORIGINAL: John Sims

Some may argue that it is the "Chav side of chav" but we just ignor such uneducated comments. []

Correction - Most will argue this regardless of their educational status []

Here's a 45MB video illustrating all things GUUOOOSHHHH from a Subaru [&:]

http://www.northloop.co.uk/Video/sti/wr1lap.WMV

 

[berg944]

Anybody out there using a non-recirculating dump valve, on a standard metered turbo and have clocked up a few miles?

What's your verdict?

 

[Guest]

Thanks John for the advice,
Don't know what type i'll go for now[]
It wasn't the noise aspect I wanted anyway...I was under the impression a non rec type offered a slight performance increase!!!
The one part of my Lux I did keep was the multi-amp ICE install, so I won't hear the noise anyway[] (sound machine Oct 2000- 911&porsche world)

Pic of my 944turbo-

 

[eastendr]

I did run the Bailey valve while I still had AFM. It worked OK, but idle wasn't quite as solid as with recirculating type.

ORIGINAL: berg944

Anybody out there using a non-recirculating dump valve, on a standard metered turbo and have clocked up a few miles?

What's your verdict?

 

[Guest]

I have just fitted a Forge Motorsport DV to mine, recirc type.

Cheers to the Biscuit. []

 

[Guest]

ORIGINAL: slim_boy_fat

I have just fitted a Forge Motorsport DV to mine, recirc type.

Cheers to the Biscuit. []

It's a DVR race divertor, better spec one than normal []

 

[Guest]

ORIGINAL: slim_boy_fat

I have just fitted a Forge Motorsport DV to mine, recirc type.

Cheers to the Biscuit. []

and the verdict is ?