Hi folks:
My turbo are has a high pitch whistle that was narrowed down to the Air recirculation valve( not the EGR valve) on top of the turbo. I plugged the ARV at the rubber connector by a ball bearing, ( EGR is already blocked). The whistle is gone only the regular turbo sound.
My Q is does blocking the ARV have bad effect on performance or mechanical wear on turbo unit??

MVK

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One penny saved is three penny earned.

1985 300D Turbo 179,000miles

The ARC valve does thee things -- causes your cruise control to surge like crazy as it switches in and out, dumps the boost when you don't need it but leaves the turbo spinning (to help eliminate turbo lag) and supposedly lets the trap oxidizer warm up more slowly to prevent it cracking.

You can live without the cruise control surge, I'm sure. I can, anyway!.

The boost cut while flying down the highway at low throttle will probably save you some gas -- I got 36 mpg on the last tank before mine quit, only 31 after. Not a big deal unless you do a lot of highway travel in light traffic.

The turbo lag elimination may or may not be a benefit, I didn't see much change.

I suspect it is there for the trap oxidizer more than anything, and you don't have one anymore.

I don't think anything will be different with the ARV blocked, certainly no extra wear on the turbo. However, if you can hear the air whistling when it opens up, I suspect your air filter to turbo hose is shot, you shouldn't hear either the vent or the turbo!

Peter

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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!

Thanks Peter. Could not have asked for a better explaination. I am now at ease. Yes I will check out the hoses again I am sure they are fine.

MVK

__________________
One penny saved is three penny earned.

1985 300D Turbo 179,000miles

Sorry to revive an old thread...

PSFRED...did you get 36mpg with the ARV connected or with the vacuum line disconnected?

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1987 300TDT
1981 VW MKI Caddy 1.6 diesel, waiting on engine swap
1983 D-50 Power Ram 4x4 "Mitsubishi" 2.3 turbo diesel
assorted gas powered crap and motorcycles

RIP: 1984 300TDT, 1982 300TDT, 1984 190D 2.2, 1992 300D 2.5, 1987 300TDT, 1982 Maxima LD28, 1983 Maxima LD28, Isuzu C223 P'ups X3, 1983 Holiday Rambler 6.2 Banks turbo diesel, 1984 Winnebago LeSharo 2.1 TD, 1985 Allegro 6.5

I believe both the air recirc and EGR were working. Shortly thereafter, the actuators for both blew and I've not replaced them. Never gotten over 32 mpg since, either!

I think that the air recirc will open on the highway while cruising, this lowers the fuel consumption while allowing near instant return of boost as the turbo stays up to speed.

I could be wrong, though, and have just goofed up while filling the tank...

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!