unsprung ratio improvement
unsprung ratio improvement
07-21-2012, 12:54 AM
#1
according to some excellent garage research done by Army ( http://www.benzworld.org/forums/w123-e-c...eight.html ) this should increase the sprung:unsprung ratio for the car from 6.0 to 6.8.
fred puhn seemed to recommend maximizing this number in "how to make your car handle" but he only cited scores of 2 ("very poor") and 5 ("good").
so: do you all think this is a worthwhile, or a useless mod?
english red rat rod 1977 240D, OM617.952 burning B99.9, iron 4-speed & 2.88 diff, 195/60/R14 on alloys, 5mph bumpers, battery in the trunk, 25mm swaybar, 4x ECE H4 lamps, double brake lamps, deleted sunroof, export zoll & california blue plates
so swapping early W123 steel wheels for late 240D aluminum ones (not bundts, the kind with the classic hubcaps) would save something like 20 kg unsprung weight.
according to some excellent garage research done by Army ( http://www.benzworld.org/forums/w123-e-c...eight.html ) this should increase the sprung:unsprung ratio for the car from 6.0 to 6.8.
fred puhn seemed to recommend maximizing this number in "how to make your car handle" but he only cited scores of 2 ("very poor") and 5 ("good").
so: do you all think this is a worthwhile, or a useless mod?
english red rat rod 1977 240D, OM617.952 burning B99.9, iron 4-speed & 2.88 diff, 195/60/R14 on alloys, 5mph bumpers, battery in the trunk, 25mm swaybar, 4x ECE H4 lamps, double brake lamps, deleted sunroof, export zoll & california blue plates
07-21-2012, 05:46 PM
#2
Ninth Year Anniversary with STD on 1-9-2020
visit: www.dieselfuelinjector.guru
Project 2018: Really get the car finished -- Turbo OM617 greater than 175 MPH goal.
RED W123 - left Germany as 240D in 1982. Full AMG body kit less rear apron, 2:65LSD, five speed Getrag 717.400, manual steering, read leather interior, manual brake conversion, electric water pump (EWP), and a bunch of other goodies ...
I have 4 of these aluminum rims, with the dashes 5.5 (not the solid white line which is 6") and they are super light. I believe they reduce the weight by over 40 pounds. Anything to shed weight is good. Lighter the car, faster it should be.
Ninth Year Anniversary with STD on 1-9-2020
visit: www.dieselfuelinjector.guru
Project 2018: Really get the car finished -- Turbo OM617 greater than 175 MPH goal.
RED W123 - left Germany as 240D in 1982. Full AMG body kit less rear apron, 2:65LSD, five speed Getrag 717.400, manual steering, read leather interior, manual brake conversion, electric water pump (EWP), and a bunch of other goodies ...
08-03-2012, 12:59 AM
#3
english red rat rod 1977 240D, OM617.952 burning B99.9, iron 4-speed & 2.88 diff, 195/60/R14 on alloys, 5mph bumpers, battery in the trunk, 25mm swaybar, 4x ECE H4 lamps, double brake lamps, deleted sunroof, export zoll & california blue plates
i know we should always add lightness, but unsprung lightness is the better kind. 40 pounds is negligible inside the (sprung) cabin.
english red rat rod 1977 240D, OM617.952 burning B99.9, iron 4-speed & 2.88 diff, 195/60/R14 on alloys, 5mph bumpers, battery in the trunk, 25mm swaybar, 4x ECE H4 lamps, double brake lamps, deleted sunroof, export zoll & california blue plates
09-05-2012, 11:20 PM
#4
(07-21-2012, 05:46 PM)Greazzer I have 4 of these aluminum rims, with the dashes 5.5 (not the solid white line which is 6") and they are super light. I believe they reduce the weight by over 40 pounds. Anything to shed weight is good. Lighter the car, faster it should be.
(08-03-2012, 12:59 AM)bricktron i know we should always add lightness, but unsprung lightness is the better kind. 40 pounds is negligible inside the (sprung) cabin.
I replaced the steel wheels on our 240 with the Light Alloy 5 1/2" rims. finally found some in PNP.
took one steel and one Light Alloy to UPS and had them weighed. as I remember, the steel was 18 3/4lbs and the Light Alloy 9 3/4lbs.
There is a special Hub Cap clip for the Light Alloys that has some plastic on it to keep from gouging the aluminum.
Charlie
(07-21-2012, 05:46 PM)Greazzer I have 4 of these aluminum rims, with the dashes 5.5 (not the solid white line which is 6") and they are super light. I believe they reduce the weight by over 40 pounds. Anything to shed weight is good. Lighter the car, faster it should be.
(08-03-2012, 12:59 AM)bricktron i know we should always add lightness, but unsprung lightness is the better kind. 40 pounds is negligible inside the (sprung) cabin.
I replaced the steel wheels on our 240 with the Light Alloy 5 1/2" rims. finally found some in PNP.
took one steel and one Light Alloy to UPS and had them weighed. as I remember, the steel was 18 3/4lbs and the Light Alloy 9 3/4lbs.
There is a special Hub Cap clip for the Light Alloys that has some plastic on it to keep from gouging the aluminum.
Charlie
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