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#1
09-19-2002, 08:34 PM
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disabling turbo air recirculation in 603
I found a nick on the nipple on the rubber plug on my Garrett turbo air recirculation valve. I don't imagine it seals well even with the spring behind it. Any technical reason not to jam a 1/2" freeze plug in the hole to disable air recirculation? I can fit a BB in the vacuum line but there'll still be leakage past the nicked piston.
Thanks, Sixto 91 300SE 87 300SDL 
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#2
09-19-2002, 09:33 PM
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Someone recommended replacing the 5 way vacuum splitter at the vacuum pump with a 3 way - which effectively disables the air recirculation and EGR. Supposedly there should be some performance gains by doing this, but I didn't notice anything.
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#3
09-19-2002, 11:27 PM
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Sixto:
A plug will work fine. I don't know how much work it is to fix the rubber seal, probably too much unless the turbo needs fixed, too. Peter
__________________
1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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#4
11-09-2002, 04:36 PM
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Can anyone verify, if disabling the things on the passenger side of the engine bay of a 603 (by replacing the 5 way fitting at the vacuum pump with a 3 way) will increase performance? These are the emission controls and air recirc, I believe.
What the heck does the "air recirculation" do anyway?
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#5
11-09-2002, 07:01 PM
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Probably increases performance a bit to have the EGR disabled, but the air recirc is supposed to give you a bit better throttle reponse.
The air recirc recirculates air from the pressure side of the compressor back to the inlet -- this allows the computer to contol boost to avoid heat shocking the trap oxidizer (hopefully long gone) and to vent the boost when cruising at light throttle while still keeping the turbo up to speed. Helps prevent that puff of black smoke when you yank your foot off the pedal at highway speed and reduces fuel consumption. Mine runs fine without, and it doesn't have the curise control surge it had when the air recirc was working. Peter
__________________
1972 220D ?? miles 1988 300E 200,012 1987 300D Turbo killed 9/25/07, 275,000 miles 1985 Volvo 740 GLE Turobodiesel 218,000 1972 280 SE 4.5 165, 000 - It runs!
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