Wastegate question...

[Jim Green]

--- Ned Ritchie <Q at IntendedAcceleration.com> wrote:
> Generally speaking the one with the hose barbs may
> be from later models
> 1991 and newer, and most likely if you compare the
> diameter of the
> actual valve it may even be larger to handle more
> exhaust in the bypass
> operation.

Hey Ned,

About the larger WG, have you ever seen one from 10vt
car be to small?  My car is running really really
well, but I still have a minor surging issue when in
5th at 3000 rpms.  If I give it WOT it will build full
boost(~20 psi) pretty quick, but once it get's there
it's like my WG starts chattering or something and it
will not hold the boost.  It will drop about 5 psi,
then raise back up, then drop again really quick.  As
the motor get's towards 3500 rpms it smooths out and
pulls up to 7k just fine.  It only does it in 5th. 
The problem was more common before my larger
intercooler went in.  It also does it at part throttle
in that area when going up a large hill.

Any idea's?  I wonder if my turbo is actually surging
and trying to flow to much air for that rpm range?  My
WG ref. line is coming from the IM.

Thanks,

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