Wastgate diaphragm KH/MC

[EBavely]

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Hello all...

I was trying to find out why my 4ktq was overboosting and just found a tear=
 in my MC engine's wategate diaphragm last night.

I had another 5kt manifold on hand, but I noticed that the wastegate spring=
, diaphragm (unfortunately also bad) and cap spring perch are different tha=
n on the MC's WG.

The diaphragm looks to have a "double lip" on the outside of it and heavier=
 folds around the center.  The spring is longer and the cap spring perch do=
es not have the bolt head (the one people modify to make adjustble) showing=
 like on the MC.  I believe this is an earlier KH wastegate.  Can anyone co=
nfirm?

I've already ordered a new diaphragm, but I was wondering if the older KH t=
ype can be used on the MC's just in case I find a "spare" somewhere.  Not s=
ure if the inner metal "cup" of the wastegate is the same.

Also... I was reading in the archives that a lister by the name of Sacchell=
e had used the KH spring and cap in his MC engined 5kt and claimed that it =
made his car feel like it had more torque (resulting from different WG spri=
ng rates).  He had other mods and such, but I was wondering if anyone else =
had done this test on an otherwise stock MC engine and had felt the same th=
ing.

Any comments?  While awaiting a chip and a matching spring, I was just thin=
king that while I'm in there, it'd be easy to switch them...

The original thread from 99 can be found at:

http://www.audifans.com/archives/1999/11/msg02309.html

Thanks in advance....

Elliott Bavely

86 4ktq
83 CGT,
81 Coupe ITB
88 80 Fwd
83 GTI FSP
83 GTI 16V
90 VW Cabriolet