My 1982 300TD "Cali" has the air recirculation valve on the turbo. Everything I've researched says that only 1984+ california models and 85+ Federal models had this valve.

I'm guessing a previous owner replaced the turbo and an "ARV turbo" was either cheaper, in-stock, or readily available at a local junkyard.

Is this most likely what I'm looking at or has anyone else seen the ARV turbos on the 1983 and earlier CA cars?

Is there any HP/MPG advantage or disadvantage to the ARV? Or is it a trivial item?

Mine has no vacuum hose attached to it nor do I find any disconnected hose nearby. Is it ok to leave it unplugged or does the vacuum port on the ARV need to be capped?

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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