[s-cars] Wastegate spring tightening

[Robert Myers]

Jim,

I'm not sure what you describe as "sensing an over-boost condition at 
higher revs" is actually the cause of the timing dial back.  More likely 
the dial back is a result of knock sensor activity.  I haven't experienced 
an overboost cutout in my urS6 but I did experience it in an '89 200 I had 
a while back.  When overboost was detected the cutout was exactly that - a 
CUTOUT.  It was like hitting the proverbial brick wall.  What you are 
experiencing is, I suspect, a sudden decrease in power level but the engine 
keeps running just at much reduced power level.  That is, as you suggest, a 
timing dial back but it's cause is, IME, the detection of a bit of knocking 
by one or both of your knock sensors.


At 07:56 AM 10/15/2004 -0400, Pasqualoni, James E wrote:

>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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Bob
Random Bushism: "That's Washington. That's the place where you find people 
getting ready to jump out of the foxholes before the first shot is 
fired."  George W. Bush, Westland, Mich., Sept. 8, 2000
_____
Robert Myers  304-574-2372
Fayetteville, WV
'95 urS6 - Cashmere Grey
_____