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Old 09-02-2010, 10:07 PM
JHZR2's Avatar
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Join Date: Jan 2002
Location: New Jersey
Posts: 4,155
Adapter for boost controller


Used to have a Dawes boost controller on my 83. I recently bought a 3bar racing (same company) controller - looks the same. Problem is, on a 617, the wastegate hose is what? 3/8 ID, but the nipple on the boost controller is maybe 1/8... So poor fit.

I found some tubing that makes a good bushing, and on the straight end it is great... On the other end 90o even with this bushing I can't get a great connection/fit. I tighten down as much as I can, but I don't think the hose clamp has enough overlap over the nipple.

Any suggestion on how to fix and make these two work?

BTW, without the controller, my 82 was only putting out 9.2 psi max. With the controller I can get that optimum 10.75, and slightly faster spool time...

Current Diesels:
1981 240D (73K)
1982 300CD (162k)
1991 350SD (113k)

Past Diesels:
1983 300D (228K)
1985 300D (233K)
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Old 09-03-2010, 10:30 AM
Join Date: Aug 2010
Posts: 111
Originally Posted by JHZR2 View Post
Any suggestion on how to fix and make these two work?
Make one with the correct nipples. The dawes valve is nothing more than a check valve with adjustable spring tension. One can be made for about $10.

BTW, without the controller, my 82 was only putting out 9.2 psi max.
Adjust the wastegate.
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Old 10-27-2010, 06:50 AM
oldsinner111's Avatar
once a happy man
Join Date: Nov 2008
Location: bristol,tn
Posts: 5,782
I used a ball valve with 3/8 fittings.

come on people now,smile on your bro,everybody get together
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