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  #16  
Old 09-17-2004, 08:31 PM
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Zen And The Art Of Diesel
 
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Quote:
Originally Posted by R Leo



But, I'm not convinced that a heavier flywheel is the silver bullet for shifting issues on the turbo. This is complete speculation but I'm guessing that n/a 617 engines have an IP that is governed throughout the rpm range. OTOH, the turbo's IP is only governed to what, 1000rpm?

What it boils down to is, when modulating the turbo's throttle during a shift, you never have a predictable engine speed for a given throttle position. The result is rough shifting.

This is much like what I felt between my NA VW diesels and the turbo's, the NA's were just much easier to match RPM to speed when shifting, if that makes any sense. The 617 turbo feels like the VW turbo, just more so.

Wonder if one can swap a NA injection pump and just up the fueling some?
No ALDA, but, hmm.. I'm getting a headache, and a TDI in a Scirocco still looks like so much fun...

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  #17  
Old 09-17-2004, 10:26 PM
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Quote:
Originally Posted by TomJ
Silly, silly boy..., don't forget the pressure plate and clutch which almost nullifies the TC.
Tom,
You musta been chasin' the girls when they were trying to teach you new math. Tell me how those parts nullify the torque converter? They're all bolted together and rotate too!

The manual's pressure plate (something like 5-8 lbs) is bolted to the manual flywheel (~13 lbs?) for a total rotating mass of say, 20+ lbs. Engage the clutch and you get another 2 or 3 lbs of the clutch disk.

On the automatic, there's the flexplate/flywheel assy (7-8 lbs?) which the torque converter (say, 10-12 lbs) is bolted to. Counting the weight of the fluid in the TC, you have practically the same rotating mass.
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  #18  
Old 09-17-2004, 10:30 PM
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Quote:
Originally Posted by wolf_walker
Wonder if one can swap a NA injection pump and just up the fueling some?
No ALDA, but, hmm..

Dunno about IPs. They're a black art as far as I'm concerned. In the long run, it would probably be easier to just learn to shift the turbo. I don't find it all that problematic but it's certainly not a car that everyone can simply get in and drive smoothly.
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  #19  
Old 09-17-2004, 10:37 PM
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Quote:
Originally Posted by R Leo

On the automatic, there's the flexplate/flywheel assy (7-8 lbs?) which the torque converter (say, 10-12 lbs) is bolted to. Counting the weight of the fluid in the TC, you have practically the same rotating mass.
The 722.3 tc weights 20 pounds dry, plus it holds about 5 pounds of fluid...
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  #20  
Old 09-17-2004, 10:38 PM
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Quote:
Originally Posted by R Leo
Dunno about IPs. They're a black art as far as I'm concerned. In the long run, it would probably be easier to just learn to shift the turbo. I don't find it all that problematic but it's certainly not a car that everyone can simply get in and drive smoothly.

Your probibly right. And I'll probibly end up doing just that.

Note to self: Buy NA 300D at some point and compare.
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  #21  
Old 09-17-2004, 10:40 PM
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Does anyone actually KNOW of a documented problem using the 240FW, ever?

And knowing MB as I do, there's usually a reason for things, why in heck is the FSM so blatent and specific about using the correct flywheel? Can it be just drivability?
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  #22  
Old 09-17-2004, 11:22 PM
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Quote:
Originally Posted by R Leo
Tom,
......On the automatic, there's the flexplate/flywheel assy (7-8 lbs?) which the torque converter (say, 10-12 lbs) is bolted to. Counting the weight of the fluid in the TC, you have practically the same rotating mass.
Exactly, that's what I meant by "nullify". No difference, or very little.
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  #23  
Old 09-18-2004, 10:42 AM
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Quote:
Originally Posted by TomJ
Exactly, that's what I meant by "nullify". No difference, or very little.
Oh, OK. I understand.
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  #24  
Old 09-18-2004, 10:43 AM
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Quote:
Originally Posted by wolf_walker
Does anyone actually KNOW of a documented problem using the 240FW, ever?

And knowing MB as I do, there's usually a reason for things, why in heck is the FSM so blatent and specific about using the correct flywheel? Can it be just drivability?
It's all about driveability, and Teutonic stubborness.

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