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

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.

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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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

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

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.

__________________
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

I agree, however, once you get the housing open, you need a specially made and very thin 14 mm wrench to hold the shaft.

Get a cheap wrench and take a grinder to it.

__________________
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

Done..........

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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Proud owner of ....
1971 280SE W108
1979 300SD W116
1983 300D W123
1975 Ironhead Sportster chopper
1987 GMC 3/4 ton 4X4 Diesel
1989 Honda Civic (Heavily modified)
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Section 609 MVAC Certified
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"He who fights with monsters might take care lest he thereby become a monster. And if you gaze for long into an abyss, the abyss gazes also into you." - Friedrich Nietzsche

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

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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I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

13mm, BTW.

Do you experience better fuel economy at 12psi?

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http://www.uni-stuttgart.de/impulse/...h_bosch_kl.jpg

Love the Bob!

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.

__________________
I'm not a doctor, but I'll have a look.

'85 300SD 245k
'87 300SDL 251k
'90 300SEL 326k

Six others from BMW, GM, and Ford.

Liberty will not descend to a people; a people must raise themselves to liberty.[/IMG]

Thanks.......can't remember.