'81 tic-tac

The turbo is off a turbo diesel volkswagen and the stock boost level is set to 11psi. I want to lower this setting to about 6psi. I know i need to adjust the wastegate on the turbo, but which bolt/screw is it, and which way do i rotate it, and how much to achieve 6psi. I can't really afford to overboost an engine these days. Thanks for any input!
-John

cuatrokoop

Integrated wastegate? Or external?

You could probably run a manual boost controller if its an integrated (internal) WG. Otherwise, you can adjust the tension on the spring under the cap on the external units. SJMAutotechnik has instructions...

'81 tic-tac

<center><img src="http://pictureposter.audiworld.com/13228/turbo_project_2.jpg"></center><p>
though i could be wrong

Merkin

external

cuatrokoop

Yeah, external, but different than the gas turbos (some of the diesels used an internal wastegate turbo, Garret and/or 3K-Warner supplied for different engines).

Thats actually a better EM than the gas turbos, WG actually vents all cylinders equally, vs the 4/5 cyl biased venting the MC/KH/WR/etc setup has...

Anyway, there should be some way to adjust the spring tension once the top cap is removed. I'd think about getting a spare to play with first. I'd also be more likely to look into a manual boost controller and/or bleeder valve used in conjunction with a good pressure gauge if you don't already have one. The bleeder is easy, taps into the WG signal line IIRC, and bleeds off pressure to a set amount, which keeps the WG closed, allowing more boost to be run. Don't forget to keep an eye on fueling! EGT or a good A/F will help you tune it too.