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  #1  
Old 11-26-2004, 05:45 AM
Brandon314159
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Thumbs up ALDA Adjustment Affecting Shifting?

I just adjusted my ALDA tonight and boy that pepped the engine up.

My question is...now my transmission shifts ultra smooth...firm but smooth
I used to have a pretty 'solid' 1st 2nd shift (doesn't everyone?) and now its just as soft as the other 2 unless I stomp on it. Could the ALDA adjustment have caused this?

I don't have ANY flaring whatsoever and the shifts are solid declines in engine speed with medium pedal (moving along pretty good but no flooring it).
This only showed up after my last (and maxed out) ALDA adjustment...I thought something went wrong!
Could the extra torque/HP be making the transmission act like it is supposed to?
Could the quicker spool up do this? (my guess is yes)

I am way happier but was just wondering what could have done this...I will check my ALDA tomorrow to see if it is/was leaky at any setting apart from the maxed out one and possibly caused my crappy shifts before.

The auto is nice and peppy now...leave little stripes of rubber taking off

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  #2  
Old 11-28-2004, 08:21 AM
Brandon314159
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*bump*
Any ideas?
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  #3  
Old 11-28-2004, 09:43 AM
tomm9298's Avatar
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Thumbs up Good question

I want to hear from some of the experts on this. Bump to you..
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  #4  
Old 11-28-2004, 03:42 PM
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Yes, the power output of a diesel engine will affect the way it shifts. The tranny is set up with inputs for the throttle position and vacuum to indicate load for the modulator. With your ALDA adjustments you are making more power with less throttle. Since the trans wasn't set up in this condition, it still shifts based on the original setup where the same amount of throttle equaled less power. When diesels are underpowered you have to really get on the throttle to get them to move. The trans sees the throttle wide open and interprets this as "man this engine should be cranking out some serious power so I've got to really grab that next shift hard or I'll slip" Only thing is when the trans grabs that next gear and the engine is not making a lot of power it engages that gear really hard. The moral.....is that MB's are complex in their simplicity and just about anything can affect everything.
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Old 11-28-2004, 04:04 PM
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that being said.....the question i have:
-are these new "smoother" shifts better...insomuch will they be "easier" on
the workings of the transmission & add to longevity...or will they wear out
clutches etc faster?...
-or, did they originally design that $50,000.00 luxury automobile to not actually have the hard shifts prior to the adjustment & perform more like a
new American luxury sedan going through the gears?...
-i noticed this when i adjusted(bypassed) my Alda as well...it was really nice
having no jerking through 1st,2nd shifts...just silky smooth power/acceleration.....but: WHAT is going on inside the tranny? for times sake?
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  #6  
Old 11-28-2004, 04:54 PM
Brandon314159
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Quote:
Originally Posted by duxthe1
The trans sees the throttle wide open and interprets this as "man this engine should be cranking out some serious power so I've got to really grab that next shift hard or I'll slip"
Sounds like me!
That is a very good explanation....was sorta thinking that but didn't piece it all together
I like your phraseology
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  #7  
Old 11-28-2004, 06:27 PM
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I'm going to have to ask a noob question

What is the ALDA valve and what does it do?

I did a search but never saw an explanation just the abreviated form.

thanks

Danny
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  #8  
Old 11-28-2004, 10:10 PM
Brandon314159
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Quote:
Originally Posted by dannym
What is the ALDA valve and what does it do?

I did a search but never saw an explanation just the abreviated form.
The short of it...
ALDA on turbo engine adjusts for more fuel under boost (needed to make more power) by sensing the boost pressure and richening up the IP
ALDA on non-turbo engine compenstates for altitude differences (same thing but with no boost)

And it is not a valve...its more of a variable source of mechanical movement per pressure units of air.

I presume it is a acronym but I am not familiar with its associated words.
Anyone?

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