[s-cars] New 1.9 Bar Waste Gate Spring Bucking "Theory"

[Dave Forgie]

Bob: Appreciate your comments and insights.  However,  I have done
nothing except replace the dead coil pack and all the bucking is gone.
Same software (MRC RS2) and same 1.9 bar spring at the same setting./
Dave F.

>>> Robert Myers <bob at chips-ur-s.com> 09/27/06 02:14PM >>>

Dave,

I betcha your bucking was bouncing off the boost limiter.  You really 
shouldn't need the stiff spring beyond what is available through 
adjusting the perch position.  The ECU uses the WGFV to prevent 
hitting the limiter (among other things) but if the spring is there 
overriding the ECU's efforts it bucks.

When a coil goes bad you get a miss, not what I would call 
bucking.  The bucking is a MAJOR source of discomfort which feels 
like it needs fixing NOW!  A miss is an annoyance which you want to 
fix soon.  At least that's my thinking.

At 04:56 PM 9/27/2006, you wrote:
>*This message was transferred with a trial version of CommuniGate(tm)
Pro*
>I have been running a 034 Motorsport 1.9 bar WG spring since March. 
I
>did have bucking issues and had to turn the center cap adjustment out
>ALL the way.  Still had some annoying bucking some times.
>
>Flash forward: coil pack dies and is replaced.  I drive the car. 
Hard.
>
>  Guess what? NO more bucking - ever.  Just smooth power like when I
>first
>  did the conversion.
>
>SO...for whatever the reason exactly, I now suspect that IF you have
>  1.9 bar spring and you have it adjusted all the way out AND you are
>still
>getting some bucking, you have a weak coil (either 1.8t coil pack or
OE
>
>style coil) and the rapid rise of initial boost that the spring
>provides makes
>  coil problem show up sooner instead of later.
>
>Its just a theory.
>
>Dave F.
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9/27/2006


Bob
urS6 with RS2 and other mods for sale: http://chips-ur-s.com/S6.html