Quote:
Originally Posted by Brian Carlton
Well, "move" is a relative term. The engine certainly builds significantly more horsepower when the turbo begins to supply more air and the ALDA supplies more fuel.
However, many of the older MB diesels are truly too slow below 2K rpm..........ridiculously so. The problem with these vehicles is one or all of the following:
1) IP timing
2) Insufficient fuel at low rpm (ALDA problem).
3) Bowden cable too loose (tightening it delays shifts).
The SD has these issues corrected and it keeps up with most traffic with about 1/4 pedal to allow it to reach 2000 rpm.
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I've owned 4 MB diesels and all of them were less pedal responsive than other diesels. The 300d I'm driving now is decent but still doesn't compete anywhere near the others at the first touch of the pedal. This is just something I've noticed driving many different diesels. Most of them are quicker (ie jerkier when you hit the pedal). I can floor my 300d and not break the tires on blacktop. It goes very nicely and will jerk your head back after 2k which is in about 1-2 seconds or so. But not remotely a launch from a stop. This is probably better for the car but just curious why this could be.
Brian, your points are valid but I don't think a problem with my car.
1. The IP was recently timed by the MB dealer (very good 60 year old MB diesel mechanic)
2. No ALDA on this one so I'm sure that's not the problem
3. Transmission shifts pretty late if I floor it. Probably around 4-4.5kRPMs.
But I still notice the launch thing. I don't think it's a tuning issue. I'm getting more than enough fuel.
I still think it's a Mercedes thing. Every other diesel I've driven has more immediate (jerky) pedal response. But I wonder why this is.
See the picture of what I interpret a typical 0-60 time as in a Mercedes 300d turbo with a 603. Notice the slow ramp of 1-2 seconds to 10mph or so. It's a cool feeling when the turbo kicks in but different than other diesels. I'm wondering why?