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spuggy spuggy is online now
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Join Date: Jul 2003
Location: Glorious Pac NW
Posts: 2,828
Re: GHL muffler install and wastegate operation ??

Originally posted by jwmarc

However with the new muffler on and test driving tonight when I got on boost and got up to .8 bar on the gauge it stayed there as I continued towards red line and only when I shifted did the presure drop and climb back up....

Any thoughts?
Oh yeah I now hear the turbo whine....sweet......
Mine always behaved precisely the way you describe.

The turbo whining is such an awesome sound..

I thought that as the pressure climbed your wastegate would begin to open little by little and when you hit .8 bar it would dump pressure by opening completely...
Wastegate controls boost pressure. It's closed until boost exceeds the set level, at which point it dumps the excess.

It can't dump boost completely - as soon as boost drops below the spring control pressure, the wastegate is completely closed again - and you'd get boost up to .8 bar..

Without the wastegate, you'd get lots and lots of boost, but not for very long, I suspect....

Sounds like something wasn't working correctly before. In which case, it must be much, much faster now, right?
'77 S with '78 930 power and a few other things.
Old 04-13-2007, 09:34 AM
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