Doesn't a manual boost controller just take the place of the
waste gate? If so then I would still have just the 5-6 lbs at
55-60. The boost only goes higher then that when I really push
the peddle down to accelerate fast and it will go up fast and
then stop right at 9lbs. It doesn't matter if I am going 45 or 60
when I nail it the boost pops up and then stops at 9. When I let
off to go to cruise the boost comes down just as fast to whatever
the steady state pressure is for that speed. I can see where a
manual boost controller will allow the boost to go higher at the
top end but don't really see it increasing the boost at 5-6lbs. I
don't think the spring is that weak that it would be letting
exhaust by at that low a pressure, especially in the one that has
just been rebuilt. From what I have read in a lot of different
places 9lbs seems to be the most reported top pressure in
unmodified turbos. I have been thinking of turning the spring
adjustment to try and raise the top boost but haven't had the
time to remove and dissect one of the turbos and do that. When I
get to that I will let everyone know what I found out.
Right now I just took time out to pull all the trim off the 300D
and get the worst dents taken out and repainted. Looks quite nice
but I wish I hadn't done it. Now I worry all the time about
someone banging into it with their door. I've taken to parking
farther away and walking a bit. May get over that in a while or I
may just sell it so I don't have to worry about it any more.
Manfred
Date: Fri, 29 Jul 2011 13:28:41 -0400
From: Rolf <r...@winmutt.com>
To: mercedes@okiebenz.com
Subject: Re: [MBZ] Bearing kit and special tool? Now chaning a cv,
shaft too...
Message-ID: <4e32edc9.9090...@winmutt.com>
Content-Type: text/plain; charset=ISO-8859-1; format=flowed
Proper boost is 11psi. Youd be surprised how much of a diff 2-3 psi
makes. You might be able to increase cruising boost by using a manual
boost controller. The waste gate will start opening as it
approaches max
psi, making for more of a curve, with the mbc you get a straight
ride up
and then a direct fall off.
-Rolf
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