|
|
|
#16
|
||||
|
||||
My SDL has a 2.86 IIRC. I've often wanted something a bit taller, but thought the V8 rear end would be a bit too much.
I'd love to drive a car with the V8 rear end in it some day. -J
__________________
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. |
#17
|
||||
|
||||
most every 603 powered car I've seen has the 2.65 rear gears. I'd bet yours does too.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#18
|
|||
|
|||
My thoughts are fix everything else first, the easy stuff before you tackle the bigger jobs like a diff swap. Things like injectors and fuel quality can have a major influence on mpg, timing (chain stretch and start of injection), low rolling resistance tires/narrow tread on the road (there is a big difference 185 vs 215 width). I knew many owners who absolutely flogged their S classes back in the day at 90mph constantly before there was any concern over speeding, fuel prices or traffic flow. Those cars lived long lives and the owners never complained about the fuel economy going down. I seem to remember 30mpg (USA) being very easy at any speed so long as you stayed out on the highway.
My point is they were built to run hard-they can take anything traffic today wants to dish out. 3500+ rpms not a big problem. It is up to you to decide if can afford to fuel it, and keep it running in top shape. Running a 2.47 diff would certainly require everything to be in good shape like pump calibration and timing, I have driven some with stock diffs and they could not make a left turn without getting run over! Each car is different... |
#19
|
||||
|
||||
Quote:
My car weighs in probably right at 3400 while the 126 weighs a bit over 3500. I've got a bit of a weight advantage and probably have a bit of an advantage in the drag department too, but I think 30 is doable in a 126 with a 2.47 rear end if you drive sensibly and keep the speed down a bit. Many would likely find the performance in my project a bit less than desirable, but I find it entirely acceptable (perception is reality). I built the car for open road cruising, not tearing up the streets. By the way, here's an annotated BMEP chart showing the calculated speed and mpg to hopefully make a little more sense of things. The road load would likely not change measurably with a 2.47 rear end, but the rpms would drop for each speed thus increasing the mileage. I turn 2100 rpm at 60 mph, just for reference.
__________________
Current Stable
|
#20
|
||||
|
||||
Quote:
Using the automatic option on the mph vs rpm calculator shows exactly what you remember
__________________
Current Stable
|
#21
|
|||
|
|||
differential
How do you know what differential you have? I have an 85 300SD was wondering if I have the 3.07 or the 2.88.
|
#22
|
||||
|
||||
Quote:
I think the 3.07 runs 3000 RPM at 70 MPH, so if yours runs less than that at 70, it's a 2.88.
__________________
"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes 1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod 2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die." |
#23
|
|||
|
|||
It's normally stamped on the lower left rear corner of the differential (looking at the cover plate side). If you have a "resilient center piece" Differential where the rear differential mount is to one side, it may be on a data plate located on the lower right rear corner.
__________________
Sam 84 300SD 350K+ miles ( Blue Belle ) |
#24
|
||||
|
||||
All the diffs I have checked have the number stamped into the carrier frame on the passengers side near the cover plate. On the flat machined portion.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#25
|
|||
|
|||
I could not find the stamping but I do run about 2850-2900 rpm at 70 mph so I guess I have the 2.88 rear. What I did quickly notice while the car was jacked up was a nail in tire peeved me off as tires only have 10,000 on them also took notice inside on both is wearing harder then outside any thoughts as what could be causing this? Oh well plugged the tire and will rotate them shortly to front.
|
#26
|
||||
|
||||
how much do you keep in your trunk? it's possible you have bad springs... or it could need an alignment.
__________________
John HAUL AWAY, OR CRUSHED CARS!!! HELP ME keep the cars out of the crusher! A/C Thread "as I ride with my a/c on... I have fond memories of sweaty oily saturdays and spewing R12 into the air. THANKS for all you do! My drivers: 1987 190D 2.5Turbo 1987 190D 2.5Turbo 1987 190D 2.5-5SPEED!!! 1987 300TD 1987 300TD 1994GMC 2500 6.5Turbo truck... I had to put the ladder somewhere! |
#27
|
|||
|
|||
Vstech I sometimes do have a lot of xtra weignt in rear but took care of that with HD. springs and thicker pads underneath the springs it sits real nice. Was wondering if the subframe bushings might be shot? Seems the top of the tire is toed in. My front are wearing just opposite so for now I will just rotate them. I did recently have it lined up also. 85 350SD (260,000) maybe more odometer was broke for awhile running strong.
|
#28
|
||||
|
||||
HD springs or shocks? I hadn't heard of HD springs for the W126.
__________________
"Senior Luna, your sense of humor is still loco... but we love it, anyway." -rickymay ____ "Your sense of humor is still loco... " -MBeige ____ "Señor Luna, your sense of humor is quite järjetön" -Delibes 1982 300SD -- 211k, Texas car, tranny issues ____ 1979 240D 4-speed 234k -- turbo and tuned IP, third world taxi hot rod 2 Samuel 12:13: "David said to Nathan, “I have sinned against the Lord.” And Nathan said to David, “The Lord also has put away your sin; you shall not die." |
#29
|
||||
|
||||
They exist, go peek some of the other parts supplies and you'll see "standard" and "hd." Its really just a notch higher in the spring part numbers. The spring your car got if you had lots of points in their spring picker system thing.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
#30
|
||||
|
||||
Quote:
Also carefully inspect your lower control arms for rust, holes, etc. Be sure to check the spring and shock mount areas too. I've replaced like 3-4 of them now due to rust.. My buddy's 300SE had a bad one and the one wheel cambered in at the top.. Yours might not be the case but still does not hurt to check.
__________________
Cruise Control not working? Send me PM or email (jamesdean59@gmail.com). I might be able to help out. Check here for compatibility, diagnostics, and availability! (4/11/2020: Hi Everyone! I am still taking orders and replying to emails/PMs/etc, I appreciate your patience in these crazy times. Stay safe and healthy!) 82 300SD 145k 89 420SEL 210k 89 560SEL 118k 90 300SE 262k RIP 5/25/2010 90 560SEL 154k 91 300D 2.5 Turbo. 241k 93 190E 3.0 235k 93 300E 195k |
Bookmarks |
Thread Tools | |
Display Modes | |
|
|