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Join Date: Nov 2005
Location: columbia md
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GHL muffler install and wastegate operation ??

Well I got the GHL euro muffler and I must say it is a nice piece of fabrication...

My Gripe is that the existing original US muffler support plate needed to be modified extensively....every one at Pelican and GHL said no problem that it would fit right up to the old plate and the support bands would hold it in place...wrong!

Does the OEM euro backing plate allow for a closer fit to the GHL muffler??

Anyway the car is back together after 3 weeks.....


Question.... When I had the entire exhaust down I inspected the waste gate ...I pushed the piston plate down a number of times to feel the tension on the spring...no big deal...

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....

B4 all this work ( removal of air pump and plenum manifold, valve adjust and dropping the whole exhaust system) when I got on boost I would push up to .8bar but then the gauge would loose pressure indicating the wastegate was kicking in. Would the diaphragm be stuck from my pushing it?

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...

Any thoughts?
Oh yeah I now hear the turbo whine....sweet......
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1987 930 -Guards Red
2001 740I sport Blk
2011 F-150 supercrew Blk
2014 X3 2.8 white
"What goes around comes around..."
Old 04-12-2007, 06:07 PM
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Re: GHL muffler install and wastegate operation ??

Quote:
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..

Quote:
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?
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'77 S with '78 930 power and a few other things.
Old 04-13-2007, 09:34 AM
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thanks... It has quite a stronger kick and the boost feels more consistent than with the old OEM cat and muffler.

Yeah the whine is cool....
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1987 930 -Guards Red
2001 740I sport Blk
2011 F-150 supercrew Blk
2014 X3 2.8 white
"What goes around comes around..."
Old 04-13-2007, 05:33 PM
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Crotchety Old Bastard
 
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It would appear that you disturbed a sticky WG mechanism and it now is working properly. Feals good when things go well doen't it. You should be really happy with this set up.
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 04-14-2007, 07:29 AM
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Brian... thanks for your input....now I have the bug to do all the other things I have heard people talking about... BTW did you get any of the hooter girls to go for a ride??????
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1987 930 -Guards Red
2001 740I sport Blk
2011 F-150 supercrew Blk
2014 X3 2.8 white
"What goes around comes around..."
Old 04-14-2007, 10:24 AM
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Crotchety Old Bastard
 
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Join Date: Jan 2000
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WHOA there, my wife may be watching over my shoulder!
What girls? You must have me confused with someone else ..........
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RarlyL8 Motorsports / M&K Exhaust - 911/930 Exhaust Systems, Turbos, TiAL, CIS Mods/Rebuilds
'78 911SC Widebody, 930 engine, 915 Tranny, K27, SC Cams, RL8 Headers & GT3 Muffler. 350whp @ 0.75bar
Brian B. (256)536-9977 Service@MKExhaust Brian@RarlyL8
Old 04-14-2007, 11:05 AM
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ok......pics of aftermarket wheels
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1987 930 -Guards Red
2001 740I sport Blk
2011 F-150 supercrew Blk
2014 X3 2.8 white
"What goes around comes around..."
Old 04-14-2007, 04:26 PM
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Damn Brian, u a pimp! If you call yourself old- I hope I have that many goodlooking girls around my car when I consider myself old!
Sorry mrs. Brian, they seem like nice girls...hehe
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86' 930/GT-40R Sold
94' Rustang GT daily (long gone)
2008 C6/Z51 Corvette
Old 04-14-2007, 04:39 PM
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