I'd like more information on turbos at altitude. I live in the Mile High city. My 85 turbo is about twice as fast off the line as my 77 non-turbo. I have attributed this to the fact that the 85 has a turbo. However, I can really feel the turbo kick in at about 2300 rpms. So,is the turbo having an undetectable effect (except by comparison with a non-turbo engine) at lower rpm's or is there some other factor making the non-turbo so much slower. Can someone comment ,who drives or has driven both at sea level? Is there a detectable difference in power between the non-turbo and turbo at rpm's below 2000?

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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13