Help with boost

randy winn

randy29
Apr 14, 2012
60
2
8
55
Ok I'll try this next but why would the controller not work have you ever heard of this happening
 

Ttype6

Well-Known Member
Aug 17, 2004
3,358
267
83
60
Flint,Michigan
Ok I'll try this next but why would the controller not work have you ever heard of this happening
The controller stops boost pressure from going to the actuator until it overcomes the spring pressure pushing against a check ball. A stiffer spring would create a situation where the check ball wouldn't move until a higher amount of pressure acted on it. The strange part is that you can't achieve more boost when you tighten your HD actuator.
A complete manual boost controller would be one such as the RJC with the addition of a needle valve. You could actually drill the body of your RJC and tap a 1/8" pipe thread hole and install the needle valve that I provided a link to. Another thing you could do is drill the existing hole in the RJC elbow out to a bigger size to create a bigger air leak. This would cause the boost to rise,but couldn't be reversed like it could with the adjustable needle valve
 

randy winn

randy29
Apr 14, 2012
60
2
8
55
When I put the new controller on I let the actuator rod out to where you just had to pull it a little to get hooked back up.
 

Ttype6

Well-Known Member
Aug 17, 2004
3,358
267
83
60
Flint,Michigan
When I put the new controller on I let the actuator rod out to where you just had to pull it a little to get hooked back up.
A manual boost controller can only do so much on it's own. If the spring in the wastegate actuator is adjusted too loose,the puck could get blown open by the exhaust pressure and or the pressure allowed to act on the actuator could open it too far. Either of these will limit the amount of boost you can produce. The only way to produce more boost from this point is to tighten the adjustment on the actuator to create more force to hold the wastegate shut. No amount of adjustment of the controller will help until you do this. It's a 3 way symphony. First we adjust the actuator so that it can't open prematurely or too far,then we put pressure against the check ball in the manual boost controller to stop the boost signal from acting on the actuator until a certain boost level,then we allow some of the boost signal to bleed off via a needle valve to prevent it from acting as forcefully on the actuator to produce an even greater amount of boost. Again,every electronic boost controller does these last two things.

When you disconnected the hose from the actuator,to see how much boost you could produce,was the actuator tight or loose like it is now?
 

Ttype6

Well-Known Member
Aug 17, 2004
3,358
267
83
60
Flint,Michigan
This is how the bleeder valve would look if you used it remotely,which I recommend to get it away from heat. If you installed it inline,you could use that stainless barbed tee that I provided a link to.


DSC00916.JPG
 

randy winn

randy29
Apr 14, 2012
60
2
8
55
A manual boost controller can only do so much on it's own. If the spring in the wastegate actuator is adjusted too loose,the puck could get blown open by the exhaust pressure and or the pressure allowed to act on the actuator could open it too far. Either of these will limit the amount of boost you can produce. The only way to produce more boost from this point is to tighten the adjustment on the actuator to create more force to hold the wastegate shut. No amount of adjustment of the controller will help until you do this. It's a 3 way symphony. First we adjust the actuator so that it can't open prematurely or too far,then we put pressure against the check ball in the manual boost controller to stop the boost signal from acting on the actuator until a certain boost level,then we allow some of the boost signal to bleed off via a needle valve to prevent it from acting as forcefully on the actuator to produce an even greater amount of boost. Again,every electronic boost controller does these last two things.

When you disconnected the hose from the actuator,to see how much boost you could produce,was the actuator tight or loose like it is now?
It was tight when I unhooked the hose
 

Ttype6

Well-Known Member
Aug 17, 2004
3,358
267
83
60
Flint,Michigan
It was tight when I unhooked the hose
The next step would be to disconnect the hose again to see how much boost you can make with the current wastegate setting. You want to make sure that the puck doesn't get blown open by exhaust pressure at some low boost number. If it does,a boost controller won't be able to raise it above that number. You want to see it easily go to 25 like before. If it doesn't,tighten the adjustment on the actuator until it does.
 
  • Like
Reactions: 1986 Buick GX1

randy winn

randy29
Apr 14, 2012
60
2
8
55
I tightened the rod up and took it out this morning. The boost went up to 25. I'm going to order that needle valve set up you showed me. Thanks for all the help this thing was about to drive me crazy. You guys really know your stuff when it comes to these cars.