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  #1  
Old 04-05-2006, 12:10 PM
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85 300SD. 9.5lb boost. Should I mess with it?

Hello

I intalled a boost gauge this morning. Necessity is the mother of invention.. I had enough line to get MOST of the way in to where I wanted to go (under the ashtray) I opted to install the gauge in the glovebox instead.

I'm getting 9.5lbs of boost using the brake and 4k RPM method.

Should I bother to spend the 30 bucks on a dawes controller to tweak it? Will I see any more performance from the 3lbs of boost? I suppose it is 30%

Ideas? Comments? Wild Guesses?

JP
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  #2  
Old 04-05-2006, 12:16 PM
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Most say that that last increase in boost will help out your top end (ie. highway driving) My '85 SD is the same way, but I have not bothered changing it yet.

You dont have to spend the money for the dawas boost controller, you can just make your own for $10 in brass fittings/a spring/ and a ball bearing/ and a bolt with lock nut. Google it.
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  #3  
Old 04-05-2006, 03:12 PM
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Or you can just adjust your existing waste gate. If your turbo is a garrett its a major pain. worth it in the end though. If you have a garrett about the max boost you can run is 14.5psi before the compressor starts to loose efficiency.
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  #4  
Old 04-05-2006, 06:54 PM
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Yup

It is a garrett.

For the couple bucks.. I'd rather not play with it.

So, consensus is get the boost up to 13.5?

JP
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  #5  
Old 04-05-2006, 07:27 PM
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Get it up to at least 12 psi.

Once you figure out how to get the Garrett wastegate diaphram housing open its not that big of a deal.
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green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

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  #6  
Old 04-05-2006, 07:35 PM
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Quote:
Originally Posted by ConnClark
Get it up to at least 12 psi.

Once you figure out how to get the Garrett wastegate diaphram housing open its not that big of a deal.
I agree, however, once you get the housing open, you need a specially made and very thin 14 mm wrench to hold the shaft.
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  #7  
Old 04-05-2006, 07:56 PM
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Get a cheap wrench and take a grinder to it.
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green 85 300SD 200K miles "Das Schlepper Frog" With a OM603 TBO360 turbo ( To be intercooled someday )( Kalifornistani emissons )
white 79 300SD 200K'ish miles "Farfegnugen" (RIP - cracked crank)
desert storm primer 63 T-bird "The Undead" (long term hibernation)

http://ecomodder.com/forum/fe-graphs/sig692a.png
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  #8  
Old 04-05-2006, 07:58 PM
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Quote:
Originally Posted by ConnClark
Get a cheap wrench and take a grinder to it.
Done..........
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  #9  
Old 04-05-2006, 08:45 PM
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I bet you get more than 9.5 with the car moving.....trust me I found that out 2 years ago when I got 13 like that but hit 20 psi 50 feet down the road.
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  #10  
Old 04-05-2006, 09:06 PM
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Nope

The 9.5 was a one time deal with the brake on at 4k RPM moving.

I drove 30 or 40 miles today. I had a big hill where I just put it to the mat. 9psi.. That's all she pulls.

JP
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  #11  
Old 04-05-2006, 09:53 PM
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Thumbs up

It seemed to help my '85 quite a bit going from 8psi to 12psi...



Check this one one - Anyone have a Manual Boost Controller?
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  #12  
Old 04-06-2006, 02:39 AM
ForcedInduction
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Quote:
Originally Posted by Brian Carlton
I agree, however, once you get the housing open, you need a specially made and very thin 14 mm wrench to hold the shaft.
13mm, BTW.
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  #13  
Old 04-06-2006, 09:24 AM
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Do you experience better fuel economy at 12psi?
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  #14  
Old 04-06-2006, 10:22 AM
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Quote:
Originally Posted by imdavid28
Do you experience better fuel economy at 12psi?


Too early to tell at the moment, I'll report back in a week or two. I did many WOT runs to get it adjusted properly so my average economy is for sure down.
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I'm not a doctor, but I'll have a look.

'85 300SD 244k
'87 300SDL 251k
'90 300SEL 325k
'91 560SEL 189k

Eight others from IH, BMW, GM, Ford, and Volvo.

Liberty will not descend to a people; a people must raise themselves to liberty.
[/IMG]
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  #15  
Old 04-06-2006, 11:32 PM
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Quote:
Originally Posted by ForcedInduction
13mm, BTW.
Thanks.......can't remember.
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