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  #1  
Old 12-07-2022, 04:18 PM
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Random Question W123 300D

Why do the turbo 300D's not have a high idle knob like the non-turbo W123's?

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1977 450SL - Orange Julius

1982 300D - Blue Steel

2014 E350 Coupe
1992 Ford Ranger
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  #2  
Old 12-07-2022, 08:26 PM
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Because you get all that extra horsepower
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1981 240D 4sp manual. Ivory White.
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  #3  
Old 12-07-2022, 10:51 PM
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I'll trade ya 10 HP for the knob
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1977 450SL - Orange Julius

1982 300D - Blue Steel

2014 E350 Coupe
1992 Ford Ranger
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  #4  
Old 12-08-2022, 02:24 PM
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Location: Knoxville, TN
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I've got a high idle knob in my 4 speed swapped Grey 82 300D.
The hole in the dash is there, all you need is the bracket, cable and such. literally fits right in.

I found one in a junkyard, pulled it because I thought it was neat and had never seen one. Got home, felt around on the dash and realized the hole was there but covered up with material. poked through carefully and installed it.
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1982 300D (w123, "Grey Car")
1982 300D (w123, "Blue Car")
2001 Ford F150 "Clifford" (The Big Red Truck)
1997 Dodge Ram 2500 12V Cummins
1996 Dodge Ram 2500 12V Cummins
Previous Vehicles:
1995 E300D, 1980 300SD, 1992 Buick Century, 2005 Saturn Ion
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  #5  
Old 12-08-2022, 03:48 PM
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Jarod, I have thought about doing just that. Seems like it would come in handy in the winter. Just seems odd to me that the turbo models don't have one.
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Central IL
1977 450SL - Orange Julius

1982 300D - Blue Steel

2014 E350 Coupe
1992 Ford Ranger
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  #6  
Old 12-09-2022, 12:40 AM
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Location: New Jersey
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Is the factory idle speed set higher on turbo engines?
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Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1991 350SD (113k)
1991 350SD (206k)
1991 300D (228k)
1993 300SD (291k)
1993 300D 2.5T (338k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (265k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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  #7  
Old 12-09-2022, 10:51 AM
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Join Date: Apr 2005
Location: Lafayette Indiana
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Maybe.
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[SIGPIC] Diesel loving autocrossing grandpa Architect. 08 Dodge 3/4 ton with Cummins & six speed; I have had about 35 benzes. I have a 39 Studebaker Coupe Express pickup in which I have had installed a 617 turbo and a five speed manual.[SIGPIC]

..I also have a 427 Cobra replica with an aluminum chassis.
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  #8  
Old 12-10-2022, 11:16 AM
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Comes in handy when getting out of an icy parking spot. While in gear turn up the idle. I've found it just enough extra to get the car moving without the rear wheels loosing traction
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95 E300D working out the kinks
77 300D, 227k, station car
83 300CD 370k, gone away
89 190E 2.6- 335k, no more
79 VW FI Bus- 145k miles, summer driver
59 VW Beetle ragtop- 175k miles
12 VW Jetta- 160k miles
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  #9  
Old 12-10-2022, 09:10 PM
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Join Date: Oct 2005
Location: Knoxville, TN
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I liked it for helping me get used to the clutch feel after the 4 speed swap, especially since I also did a 2.88 diff swap right after the 4 speed swap, so gearing was a little taller and TN hills took a little learning with the light flywheel, and taller rear end.

I don't hardly touch it anymore, I'm not even sure if it still is hooked up to be honest.

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1982 300D (w123, "Grey Car")
1982 300D (w123, "Blue Car")
2001 Ford F150 "Clifford" (The Big Red Truck)
1997 Dodge Ram 2500 12V Cummins
1996 Dodge Ram 2500 12V Cummins
Previous Vehicles:
1995 E300D, 1980 300SD, 1992 Buick Century, 2005 Saturn Ion
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