I am trying to find out which has more drag, the 123 or the 126. Since in 85 they both were available with the 617 turbo and a 288 diff top speed should tell the tale.

Wiki says top speed for the 300sd in 85 is 106.

They don't say for the 300d in 85.

I suspect about the same.

Anybody done a top speed run in an 85 300d with a good sound engine but and 100% stock?

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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.

What exactly are you looking for with drag numbers? W123 - .42
W126 - .36
W124 - .31-.32

Source: searching forum

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TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

i have had my 85 300D up to 105, it had more to go but i had to slow down.

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1985 300TD Turbo Euro-wagon
1979 280CE 225,200 miles
1985 300D Turbo 264,000 miles
1976 240D 190,000 miles
1979 300TD 220,000

GONE but not forgotten
1976 300D 195,300 miles
1983 300D Turbo 175,000 miles

http://i42.photobucket.com/albums/e3...e485-1-2-1.jpg

Thanks! Now if I had frontal area I would be in business for total drag. I think the 126 may have a bit more frontal area.....or not. In looking at them both, I believe the rear of the cabin area to be the same width, but the front end a bit wider on the 126.

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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.

My old '85 TD would not go over 95, linkage could have been loose I guess. Plus the wagon surely pushes more air.

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08 R320 CDI current

Past
95 E420
87 300D Turbo 5spd
90 300TE
83 300SD
85 300TD
92 400E
85 190D

I had the 85 up to 100 one time, eng had over 300K on it, was still climbing, but backed off.

Eng was acting up or something, and it pissed me of so I floored her figuring it would blow out the back end (tail pipe) or I would have Rods hanging out the lower end. still wasn`t running right, but I felt better.

Charlie

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there were three HP ratings on the OM616...

1) Not much power
2) Even less power
3) Not nearly enough power!! 240D w/auto

Anyone that thinks a 240D is slow drives too fast.

80 240D Naturally Exasperated, 4-Spd 388k DD 150mph spedo 3:58 Diff

We are advised to NOT judge ALL Muslims by the actions of a few lunatics, but we are encouraged to judge ALL gun owners by the actions of a few lunatics. Funny how that works

No mention of the trans? Engine and final drive alone do not tell the full story.

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83 300TD (need rear wiper assembly dead or alive)
84 300SD Daily driver
85 300TD almost 400k miles and driven daily.
98 E300D *sold
86 300SDL *sold and made flawless 10 hour journey to new home.

Well, they were only offered with a standard four speed non overdrive automatic transmission. Am I missing something?

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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.

You're not going to get a good accurate result. Even with equivalent engines, the specific tires and wear on the drivetrain is enough to skew it off by at least a few mph. IMO the best thing to do is go off of their theoretical numbers and make sure that you've got a good solid car to get as close as possible. I honestly don't get what you're trying to do though, new project? Also I should mention that the numbers I cited above all pertain to the sedan variants AFAIK.

__________________
TC
Current stable:
- 2004 Mazda RALLYWANKEL
- 2007 Saturn sky redline
- 2004 Explorer...under surgery.

Past: 135i, GTI, 300E, 300SD, 300SD, Stealth

wagons have a lower cd than the sedans or the coupe in the w123 form.

April 1981 Road & Track test of a 300TD

120hp @ 4350 RPM (SAE net)
170 ft. lb. torque @ 2400 RPM

Final drive ratio 3.07:1
4 speed automatic
1st gear - 3.68:1
2nd gear - 2.41:1
3rd gear - 1.44:1
4th gear - 1.00:1

0 - 30mph 3.8 secs
0 - 50mph 9.3 secs
0 - 60mph 13.2 secs
0 - 70mph 18.1 secs
0 - 80mph 26.4 secs

speeds in gears

4th gear (4500 rpm) 102 mph
3rd gear (4500 rpm) 73 mph
2nd gear (4500 rpm) 43 mph
1st gear (4500 rpm) 28 mph

The road test had some summary info of a 300SD that indicated a 0 - 60mph of 12.7 secs

And just because I have it - January 1987 road test of a 1987 300TD (w124)

143hp @ 4600 RPM
195 ft. lb. torque @ 2400 RPM

Final drive ratio 2.65:1
4 speed automatic
1st gear - 3.68:1
2nd gear - 2.41:1
3rd gear - 1.44:1
4th gear - 1.00:1

0 - 30mph 3.0 secs
0 - 50mph 7.2 secs
0 - 60mph 10.3 secs
0 - 70mph 14.1 secs
0 - 80mph 19.0 secs

speeds in gears

4th gear (est 4600 rpm) 115 mph
3rd gear ( " ) 84 mph
2nd gear ( " ) 51 mph
1st gear ( " ) 32 mph

The later cars have taller final drives. I'd think the W126 goes a tad faster since it slips through the air a bit better.... unless both of them are able to hit the RPM limiter.

-J

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1991 350SDL. 230,000 miles (new motor @ 150,000). Blown head gasket

Tesla Model 3. 205,000 miles. Been to 48 states!
Past: A fleet of VW TDIs.... including a V10,a Dieselgate Passat, and 2 ECOdiesels.
2014 Cadillac ELR
2013 Fiat 500E.

I am trying to estimate the fuel economy possible with my five speed od tranny in my 85 300sd. I am getting 35 consistently with my 123 300d euro na motor running 307 diff and the 18% od tranny.

If the 126 has less drag, and it appears maybe to have, with the 288 gears and the od I should be able to get high thirties highway.

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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.

This is good stuff, thanks very much!

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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.

I had an 83 wagon that would sit on 100 all day unless you had to climb a hill.

Whip