STD Tuning Drivetrain Upgrade driveshafts with diff?

Upgrade driveshafts with diff?

Upgrade driveshafts with diff?

 
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madmog
Naturally-aspirated

23
09-08-2018, 03:53 PM #1
On a W114/5 when changing a rear diff for more power, Ie lowering the ratio, are the original W114 driveshafts up to the job (300-350bhp) or should others be used? If so, from the various diffs that are compatible (W116, W123, early W126) do any of the driveshaft lengths match? Or do they have to be made?

Thanks
madmog
09-08-2018, 03:53 PM #1

On a W114/5 when changing a rear diff for more power, Ie lowering the ratio, are the original W114 driveshafts up to the job (300-350bhp) or should others be used? If so, from the various diffs that are compatible (W116, W123, early W126) do any of the driveshaft lengths match? Or do they have to be made?

Thanks

NZScott
HX30W 73/44mm

398
09-08-2018, 08:03 PM #2
It's moreso the flex discs that are the weak link. V8 driveline would be the way to go (110mm discs vs 90mm?)
I'm just going to go the full way and get a one piece driveshaft built for my ~200hp build


1978 300D, 373,000km... OM617.912 with a Holset HX30W, 7.5mm IP, 711.113 5 speed (project car, 7 years off the road and counting ;/)
1977 250 270,000km (parts car)
1977 300D (ex 280) 500,000km

1981 240D 498,000
1975 HJ45 ???,000
2001 2.8TD Rodeo 4x2 - 456,000 - DD




NZScott
09-08-2018, 08:03 PM #2

It's moreso the flex discs that are the weak link. V8 driveline would be the way to go (110mm discs vs 90mm?)
I'm just going to go the full way and get a one piece driveshaft built for my ~200hp build



1978 300D, 373,000km... OM617.912 with a Holset HX30W, 7.5mm IP, 711.113 5 speed (project car, 7 years off the road and counting ;/)
1977 250 270,000km (parts car)
1977 300D (ex 280) 500,000km

1981 240D 498,000
1975 HJ45 ???,000
2001 2.8TD Rodeo 4x2 - 456,000 - DD




madmog
Naturally-aspirated

23
09-09-2018, 05:33 PM #3
(09-08-2018, 08:03 PM)NZScott It's moreso the flex discs that are the weak link. V8 driveline would be the way to go (110mm discs vs 90mm?)
I'm just going to go the full way and get a one piece driveshaft built for my ~200hp build

Thanks. 

I should have said I'll increase the flex disc diameter, possibly get whole prop of something like a 560SEC and shorten/lengthen to suit. I just wondered whether the driveshafts were weak. I presume they would be narrower on a W114/5
madmog
09-09-2018, 05:33 PM #3

(09-08-2018, 08:03 PM)NZScott It's moreso the flex discs that are the weak link. V8 driveline would be the way to go (110mm discs vs 90mm?)
I'm just going to go the full way and get a one piece driveshaft built for my ~200hp build

Thanks. 

I should have said I'll increase the flex disc diameter, possibly get whole prop of something like a 560SEC and shorten/lengthen to suit. I just wondered whether the driveshafts were weak. I presume they would be narrower on a W114/5

NZScott
HX30W 73/44mm

398
09-09-2018, 11:56 PM #4
Oops sorry. Didn't realise you meant the half-shafts....that I cannot help with and might learn something myself


1978 300D, 373,000km... OM617.912 with a Holset HX30W, 7.5mm IP, 711.113 5 speed (project car, 7 years off the road and counting ;/)
1977 250 270,000km (parts car)
1977 300D (ex 280) 500,000km

1981 240D 498,000
1975 HJ45 ???,000
2001 2.8TD Rodeo 4x2 - 456,000 - DD




NZScott
09-09-2018, 11:56 PM #4

Oops sorry. Didn't realise you meant the half-shafts....that I cannot help with and might learn something myself



1978 300D, 373,000km... OM617.912 with a Holset HX30W, 7.5mm IP, 711.113 5 speed (project car, 7 years off the road and counting ;/)
1977 250 270,000km (parts car)
1977 300D (ex 280) 500,000km

1981 240D 498,000
1975 HJ45 ???,000
2001 2.8TD Rodeo 4x2 - 456,000 - DD




g wizz
fuel oil junkie

32
10-19-2018, 10:44 AM #5
(09-09-2018, 05:33 PM)madmog
(09-08-2018, 08:03 PM)NZScott It's moreso the flex discs that are the weak link. V8 driveline would be the way to go (110mm discs vs 90mm?)
I'm just going to go the full way and get a one piece driveshaft built for my ~200hp build

Thanks. 

I should have said I'll increase the flex disc diameter, possibly get whole prop of something like a 560SEC and shorten/lengthen to suit. I just wondered whether the driveshafts were weak. I presume they would be narrower on a W114/5

.065 tube ish or the metric equivalent.  they actual shaft is probably good for 4-500ftlbs tho the slip spline is pretty small. the flex disks are the rowdy part tho.  then getting everything to align once you go soild vs rubber>

benz force sells pucks that can take a u joint flange. i i were to do it all over again i would just throw away the mercedes stuff buy those have tom woods make a shaft and run u joints.

85 300d om603, 717, he 341, sch40 stainless manifold with prioritized 50mm external W/G (2"open dump), intercooled, intake manifold, full 3.5 stainless exhaust.
need to figure out a different trans cause its already pissed with only 5.5mm elements... then diff and suspension. but for now its daily as described above.
g wizz
10-19-2018, 10:44 AM #5

(09-09-2018, 05:33 PM)madmog
(09-08-2018, 08:03 PM)NZScott It's moreso the flex discs that are the weak link. V8 driveline would be the way to go (110mm discs vs 90mm?)
I'm just going to go the full way and get a one piece driveshaft built for my ~200hp build

Thanks. 

I should have said I'll increase the flex disc diameter, possibly get whole prop of something like a 560SEC and shorten/lengthen to suit. I just wondered whether the driveshafts were weak. I presume they would be narrower on a W114/5

.065 tube ish or the metric equivalent.  they actual shaft is probably good for 4-500ftlbs tho the slip spline is pretty small. the flex disks are the rowdy part tho.  then getting everything to align once you go soild vs rubber>

benz force sells pucks that can take a u joint flange. i i were to do it all over again i would just throw away the mercedes stuff buy those have tom woods make a shaft and run u joints.


85 300d om603, 717, he 341, sch40 stainless manifold with prioritized 50mm external W/G (2"open dump), intercooled, intake manifold, full 3.5 stainless exhaust.
need to figure out a different trans cause its already pissed with only 5.5mm elements... then diff and suspension. but for now its daily as described above.

 
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