[s-cars] N75 WGFV

[Ray Tomlinson]

All,

Jim's description of the "K" valve is quite accurate.

For starters, the "K" valve to which he refers is the Wastegate Frequency
Solenoid, commonly referred to as the Wastegate Frequency Valve.  The "K"
refers to the suffix "K" in the VAG part number.  Those of you that have a
US version of ETKA will not find 034 906 283 K in your catalog, because the
solenoid was designed by Eaton for use almost exclusively with the RS2
turbo.  The difference between the 'K' valve and the stock 'H' valve (034
906 283 H) is the duty cycle of the solenoid.

The WGFV measures boost pressure relieved by the wastegate, and reports the
same to the ECU.  The WGFV's ability to quickly and accurately meter
relieved excess boost pressure ensures that the ECU does not detect
prolonged overboost or boost spikes, to which the ECU responds by dialing
back timing.  A faster duty cycle can more quickly and accurately "detect"
and report boost spikes to the ECU, while reducing the potential for the
same created by the increased charge air pressure created by the RS2 turbo.

I know of only one US vendor for the "K" valve.  $90 through TJM Motorsport.
www.tjmmotorsport.com.

Ray



-----Original Message-----
From: s-car-list-bounces+ray=s-cars.org at audifans.com
[mailto:s-car-list-bounces+ray=s-cars.org at audifans.com]On Behalf Of
Pasqualoni, James E
Sent: Friday, October 15, 2004 7:57 AM
To: 'Elijahallen92 at aol.com'; fastscirocco_2000 at yahoo.com;
urs4 at magnaspeed.net; s-car-list at audifans.com
Subject: RE: [s-cars] Wastegate spring tightening


You may also want to consider using a K-valve wg frequency valve instead.
It will help your wg do it's job better and faster.  Prior to install, I was
seeing similar boost values to Elijah's wife's car.  Since the ECU in my car
was sensing an over-boost condition at higher revs, it was cutting back on
the timing and slowing me down-power was peaky at higher rpms.  With the
K-valve, boost is rock sold at 25 psi from around 3,400 all the way to
7,000.  Power is stronger and way more linear.  Plus it's only about $90
with a DIY install!

HTH,
Jim

-----Original Message-----
From: s-car-list-bounces at audifans.com
[mailto:s-car-list-bounces at audifans.com] On Behalf Of Elijahallen92 at aol.com
Sent: Friday, October 15, 2004 7:50 AM
To: fastscirocco_2000 at yahoo.com; urs4 at magnaspeed.net;
s-car-list at audifans.com
Subject: Re: [s-cars] Wastegate spring tightening



In a message dated 10/14/2004 9:15:30 PM Eastern Standard Time,
fastscirocco_2000 at yahoo.com writes:

OK, so I  have the RS2 performance mods, should I be thinking about
adjusting the  spring?


Tanks
Chris

Slip sliding away my  friends!



Chris,
 My wife has the full RS2 setup on her car and does not have a boost  gauge
so I left the spring alone until last weekend when I hooked a gauge up  just
to
see what her setup was making. Well, with the spring in the stock  position
the car is making and holding 28psi to around 6000 and then backing it  off
to
22psi. This is much more boost than I had expected so I left the spring
where
it is because at this level the car would start overboosting if the spring
was tightened at all. Now on my old car with a much larger turbo I had a
stiffer  spring in as well as four turns and running the same SW as she is
from
Pastore  would boost to around 26psi and hold 24 to redline. Even though the
car
was  making much more power it was making less boost I assume because of the

large  compressor wheel bringing in a more efficient charge of air. Anyway
if
you don't  have a boost gauge get one before you tamper with the  spring.

Elijah
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