I don't know about turbo diesel engines but gasser turbo engines typically have lower compression. This accounts for less power before the turbo spools up.

The original Porshce turbo engines had like 7.6 to 1 compression and NA of the same era had at least 9 to 1.

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Doug

1987 300TD x 3
2005 E320CDI

The EPC seems to indicate the same cam for the 603.960 (turbo) and 603.912 (non-turbo). Interesting. The compression ratio is about the same, though, in the 21:1 range. Mercedes doesn't use the low-compression diesel design.

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Dave
Boise, ID
Check out my website photos, documents, and movies!

if you really didnt want a turbo, you could just disconnect the vacuum from the wastegate actuator, and you wouldnt have any boost. dont know why youd want to though. My car ran like this for years without me knowing.

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1991 300 D 2.5 Turbo, 220k
also in the family:
1981 240 D 185k
1991 350 SD 185k
2006 S 500
2005 SLK 350

Note that up to about 1989, most (if not all?) the turbo wastegates were pressure operated - so if you disconnected or plugged the hose, the wastegate would never open, and you could end up with excess boost pressure. Most of the 1990-up models operate as Grdenko describes, where they are open all the time (zero boost), unless a vacuum signal is present which closes the wastegate and allows boost to build. Make sure you know which type is on your car before disconnecting or plugging the hoses, as the effects are opposite for the two different types.

thanks for all the helpes guys!!!

i'm cleaning all the vac lines and the solenoid thingy today, there's lots of oil leaks around the vacuum lines and ALDA connections

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85 190E 2.3(SOLD)
86 230E (-->300D) sold
87 300D (-->300TD) sold
68 250S w/ a 615 and manual tranny (RIP)
87 300TD (SOLD)
95 S280 "The KRAKEN" (Turbo 2.9 602 transplant) traded
86 190E 2.3... current project