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#1
06-07-2008, 12:53 AM
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Overboost Protection question
Do you guys reccomend to bypass that 3 way switch over valve???
thx
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Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN  1995 E320 SE 220k mi 1984 300SD 350k mi 
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#3
06-07-2008, 02:19 AM
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The only way I would consider it is if I had a known accurate boost gauge in line of sight at all times, and even then it sounds like a bad idea. A new changeover valve is a lot cheaper, and easier to replace then a turbo or more!
-Jason
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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket  Tesla Model 3. 205,000 miles. Been to 48 states! Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels. 2014 Cadillac ELR 2013 Fiat 500E.
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#4
06-07-2008, 04:17 AM
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If it is currently working, leave it be.
If it is blocked/leaking then replace it if you can but its fine to remove it if you have a boost gauge within line of sight all the time (On the dash, not in the ash tray.)
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#5
06-07-2008, 08:50 AM
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1982 300CD Petrol/Black Leather
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#6
06-07-2008, 12:53 PM
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Will this little valve effect my MPG???
__________________
Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN 1995 E320 SE 220k mi 1984 300SD 350k mi
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#7
06-07-2008, 02:11 PM
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It doesn't affect mpg if it's functioning.
All it does is block manifold pressure to the IP fuel enrichment device because there is more manifold pressure than the engine can safely handle. Fueling is more or less reduced to what the engine could handle if there weren't a turbo. These engines are factory tuned for good mpg and power. Not much you can do besides keep all operating parameters within spec and be gentle with your right foot. I'm not sure EGR and ARV (I doubt your car has ARV) make a dent in mpg. Of course you can compromise the balance in favor of mpg over power but, and I don't mean to put you down, if you're asking about the overboost protection switchover valve, you're a number of steps away from understanding cam timing, IP timing and ALDA adjustments. Sixto 87 300D
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#8
06-07-2008, 09:16 PM
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Quote:
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#9
06-07-2008, 09:58 PM
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I have ordered my valve, dose anyone know where and what hose hook on to that valve???
thx
__________________
Current Garage 2008 Mercedes GL320 CDI 188k mi Repair/Work in progress 1994 S350 160k mi Garage Queen & prepping for repairs 2005 E320 CDI 203k mi Healthy & Daily Driver 1994 S350 357k mi Retried as parts car 1984 300TD 214k mi Blown OM617 Poss OM603 Swap?? Sold 1987 300SDL 200K+ 1994 S320 181K mi 2008 E320 Bluetec 127k mi 1999 S420 130K mi 1980 240D 360k mi 15+ Others that has come, stay and gone GONE, BUT NOT FORGOTTEN 1995 E320 SE 220k mi 1984 300SD 350k mi
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