Fuel economy is poor.

Performance 0-60 is miserable, especially with new valves.

You stated that you recently replaced the catalyst. Any chance that this device is an aftermarket POS that is causing a significant exhaust restriction?

deanot442,

Did I read that correctly? (Is that a "C" [compression] DIESEL rated Lubricant?)

__________________
'84 300SD sold
124.128

Thanks, don't be shy now - tell me what you really think -about my "miserable" 0-60 time.
I think I could have gotten better times for a number of reasons .
What should I expect 0-60?

The trap oxidizer was replaced at the local MB dealer under recall (or what ever it was called )- I hope it is not a knockoff. It may have 2K miles on it.
I was under it today replacing flex discs, I saw no MB marks on the catalyst - perhaps they come unmarked, though I sort of doubt it.
Unfortunately though, after the fact, I learned that this dealer does not have the best reputation of MB dealers in the U.S..

When they did the trap - catalyst switch they -
broke 2 of the 3 hangers for the muffler and left the muffler hanging on 1,
failed to tighten a turbo bracket (bolt was half way out),
failed to tighten the exhaust pipe flange ,
did not replace the exhaust pipe coupling gasket - re-used the old one,
left the pipe from exhaust manifold to turbo loose,
it is was poor and unprofessional job - no doubt.
I had a chat with MB USA LLC regarding the workmanship, got some results.
Never occurred to me that my catalyst might not be MB.
I hope it is not a POS catalyst. Will look into this further.

__________________
1986 300SDL 201K Daily Driver
1984 300D In Progress
1989 240GL 196K Swedish Brick
1984 300SD -- Sold 289K
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I'm not known for "beating around the bush" on here. You can find plenty of other folks who will talk your ear off..........

O-60 on the '87, which has a new head, is a relatively slow (to me) 12.8 seconds. That's about the factory spec.

0-60 on the '86 is 10.7.........original 14 head. It's very quick.

At the moment, the discrepancy is a mystery to me..........but, I, too will be poking into the exhaust and the catalyst on the '87.

In your case, I don't think that the exhaust can be the sole culprit here. Furthermore, no matter the brand of cat, it's unlikely that it has plugged in such a short time.

Was there any relationship between the point where the performance fell and when the new cat and exhaust system was installed?

I'm sure your gauge is fine.

Please connect the boost gauge to the ALDA line and route the gauge inside the cabin (through the driver's window).

Drive the vehicle and observe the gauge. Get a reading in third gear at 3500 rpm with the pedal on the floor. Report back.

5 holes around the sides and 1 small one on the bottom?

__________________
Michael LaFleur

'05 E320 CDI - 86,000 miles
'86 300SDL - 360,000 miles
'85 300SD - 150,000 miles (sold)
'89 190D - 120,000 miles (sold)
'85 300SD - 317,000 miles (sold)
'98 ML320 - 270,000 miles (sold)
'75 300D - 170,000 miles (sold)
'83 Harley Davidson FLTC (Broken again) :-(
'61 Plymouth Valiant - 60k mikes
2004 Papillon (Oliver)
2005 Tzitzu (Griffon)
2009 Welsh Corgi (Buba)

so, how do I bring that up into the 27 range lol...

I'm milking it right now to see how much I can get from a tank

Drive on the highway! The tank you have right now is winter fuel so don't expect much. I bet you get 450-475 out of it, you won't get above 500 before the light comes on unless your doing a lot of highway driving.

__________________
1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

I knew it was crappy winter fuel... lol

Can't wait to get some regular diesel in there

At 3500 RPM in 3rd gear floored I get 11.5 - 12 PSI boost.
With the trans in drive and flooring it, I more consistently get 12 PSI.
No matter what gear though, my boost max. is 12 PSI even at 3800 RPM.
I guess the waste gate actuator is working.
The FSM states that I should achieve about 5.0 PSI boost at 1600 RPM.
I am still down around 2.0 -2.5 PSI at 1600 RPM level.
There is a lot variance based on load and temperature below 2000 RPM.

__________________
1986 300SDL 201K Daily Driver
1984 300D In Progress
1989 240GL 196K Swedish Brick
1984 300SD -- Sold 289K
------------------------------

I have not looked at the catalyst since my last post, however I can't duplicate your 10.7.
My best is about 13 sec. 0-60 flat out , floored.
I don't see smoke when idling or light acceleration ,but do have quite a bit when the beast is floored.

When I purchased the car it was a dog. Had been sitting about 2 years and started periodically but not driven.
As I have repaired and replaced virtually everything except the lower end, the performance has increased but leveled off.
I can identify no specific point in time or incident where the MPG has fallen.
It is just a matter of after the repairs and such, not achieving the frequently reported higher mileage.
I suppose I should be glad that I'm getting what I do for mileage.
Unfortunately , so many people are getting better , you know, MPG envy or some such macho thing.

__________________
1986 300SDL 201K Daily Driver
1984 300D In Progress
1989 240GL 196K Swedish Brick
1984 300SD -- Sold 289K
------------------------------

You really must be careful of the claims made for this vehicle. I'll guarantee that this '86 gets 28 mpg in the summer...........never less..........but, realize that I'm on the highway 90% of the time and my speeds around the NYC area are never more than 70 mph. Furthermore, I'm an "anti-brake" fanatic..........I can go 150 miles and only hit the brakes for the toll booth and the three cloverleafs.

It's a rather heavy vehicle and if you use it around town, those numbers are impossible to achieve.

Low 20's are what I saw. 90%-100% around town, 2k-3k shifts, some AC.

My broker drivers her 86 with a lead foot, I mean she floors it all the time the throttle is really an on off switch with her, she gets about 20.

Still considering these are big heavy cars, and a 560SEL would get about half that...its not so bad.

__________________
1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200

I got 21 mpg on winter fuel with the AC on 75% of the time and like 50/50 city,hwy.

not bad for a big S-Class.. the 560SEL gets what... 12?

Yeah thats what I always figured. I mean even my Golf doesn't do much better than that. I think I can get 26 if I short shift it at 2k.

For what they are these cars do pretty good.

__________________
1999 SL500
1969 280SE
2023 Ram 1500
2007 Tiara 3200