Adjustable Wastegate Actuator and the BstC Boost Controller

[huntsg]

I have an adjustable waste gate actuator and a BstC boost controller and I can't get the boost to come down. With the BstC Controller on minimum, I extended the rod a good 1/4"-1/2" from my last run (it is very easy to connect to the waste gate now) but the boost didn't come down at all. What am I missing? Can the actuator be broken? How would it still build boost? If it is extended too far will this occur? Thanks.

 

[Heisenberg]

You can easily test the actuator by inserting a blow gun nozzle into the actuator line.
I like to set an adjustable air pressure regulator to say - 35 psi or so.

Then press trigger and watch if the actuator moves freely.

 

[huntsg]

I'm wondering if the waste gate solenoid is bad. Does anyone know if the BstC controller will work without one?

 

[salvageV6]

The BSTC controller runs/pulses the wastegate solenoid(s) so no it will not work without a good one.

 

[huntsg]

Well, I can test the actuator as described above, but I can't deduce how I'm able to continue to build so much boost (~23 lbs) with the rod unthreaded so far??

 

[TurboBob]

bypass all the solenoid stuff, connect the wastegate "tuner style", and see what the base boost of your setup is. The solenoid and all of the boost control gizmos can only adjust up from there.


Bob

 

[earlbrown]

hook it up 'turner style' by eliminating all the addon stuff. Run a single line from the compressor to the wastegate actuator. Set the boost where you want it then back off a couple pounds. Next add the factory 'Y' and boost control solenoid, then slowly add any other gimmicks one by one and that will tell you where the problem is.

 

[turbo89]

I have an adjustable waste gate actuator and a BstC boost controller and I can't get the boost to come down. With the BstC Controller on minimum, I extended the rod a good 1/4"-1/2" from my last run (it is very easy to connect to the waste gate now) but the boost didn't come down at all. What am I missing? Can the actuator be broken? How would it still build boost? If it is extended too far will this occur? Thanks.

in the metered Y .. see what the orifice size is.. if its .028 or about .. you need to open that up ~.040

 

[huntsg]

Let me make sure I understand this 'tuner style'. First I take the actuator rod and make it as short as possible by screwing it in. Then I eliminate the 'Y" by running a boost line directly from the turbo to the waste gate actuator. Then I make a run and record the boost. That will be the base boost. If it is too high, I back the threads out on the rod. Once the base boost is set I add the 'Y' and solenoid back in and then my BstC controller will control boost up from there.

 

[huntsg]

I don't follow you turbo89. Can you explain a little more. The 'Y' is a stock 'Y'.

 

[turbo89]

they had that stock Y in a few different forms ... on some the orifice restrictor ( small cap inside) was .028 ( like on a TTA) and some were .040 (GN's) .. make sure you have the larger one.

I set the rod on the wastegate so I have to pull slightly to slip it on.. then I have a few Y's with custom restrictor sizes that I can alter the boost to the range I need...

If you try and use a .028 on a GN the boost will be higher

 

[earlbrown]

Let me make sure I understand this 'tuner style'. First I take the actuator rod and make it as short as possible by screwing it in. Then I eliminate the 'Y" by running a boost line directly from the turbo to the waste gate actuator. Then I make a run and record the boost. That will be the base boost. If it is too high, I back the threads out on the rod. Once the base boost is set I add the 'Y' and solenoid back in and then my BstC controller will control boost up from there.

Yes. The idea here is to keep it simple. Run a singular rubber hose from the turbo compressor to the wastegate. Set the rod where you have to stretch it about 1/8" then test drive it. That will be your starting point.

 

[TurboBob]

yes, to restate, do NOT set the rod as short as you can,

you want to set it as long as practical. I agree with earl, 1/8" of preload tension is a good place to start.

Bob

 

[huntsg]

Got it. Thanks a bunch. I should be able to test the tuner style tomorrow. Now I'm just not sure how I will measure the orifice restrictor...

 

[turbo89]

Got it. Thanks a bunch. I should be able to test the tuner style tomorrow. Now I'm just not sure how I will measure the orifice restrictor...

easy ... drill bits !

 

[huntsg]

Ha ha. That was good! Should have thought of that myself. Thanks.

 

[turbo89]

Ha ha. That was good! Should have thought of that myself. Thanks.

another thing to check .. is that a HD adjustable wastegate ( 17-18 psi min ) .. might want to check the part number on it as well .. just 1 more quick check

if that orifice is .028 you will have to open it up or get a original GN one... it doesn't take very much opening on that restrictor to get a big change in lowering boost .

 

[huntsg]

What's the part number? The actuator came with the car when I bought it.

 

[turbo89]

What's the part number? The actuator came with the car when I bought it.

I believe the HD one ends with a 144 part number.. 673 should be the stock one

 

[earlbrown]

Don't worry about orifice sizes right now. Get the car where you have control of the boost and it's not going to shoot a head gasket out the side and go from there.