[200q20v] speedo and boost,....Foggy windows.

Gene Caldwell optic at halcyon.com
Fri Sep 29 03:02:40 EDT 2000

Brian.Link at Level3.com wrote:
> Well I finally got time to install my boost gauge on the A-pillar using a
> VDO vision series gauge and a A-pillar Gauge pod designed for an Acura
> Legend.  Well the fit wasn't that close, but the heat gun can turn the
> plastic into putty for easy molding, that and a dremel.
> I could use some help on a few issues.
> the car is a 91 200tq with a tap modified computer.
> 1. I have had a surging problem at high boost and I'm trying to fix it.
> With the boost gauge I can see the needle go up to 19 psi, then it
> oscillates (really quickly) back and forth from 14-19 psi.  any guesses?
> Pressure leaks?,  WGFV?, ECU?.

At max boost (20+psi), my gauge 'flutters' (needle becomes almost a
blur) about 1-2psi. Ned Ritchie assured me that is to be expected as the
WGFV is being worked to regulate boost.  I've never seen a 5 psi
oscillation range though.  My ECU has an IA modification; boost gauge
pressure takeoff is at the ECU; wastegate spring is stock.


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