manual boost control setup - include ecu & solenoids OR exclude ecu totaly
manual boost control setup - include ecu & solenoids OR exclude ecu totaly
Well after the great thread on air flow,3+mods, and stock ecu usage, I had to bring this up....
More often than not, I see the manual boost/pre-control setup with the bleed valves in between the turbo pipes and the actuators, basically replacing the restrictor pills. This is how it is shown on Rob's site http://robrobinette.com/boost_controller.htm and many other sites. This setup keeps the ecu/solenoids in the loop.
The other setup is bypassing the ecu/solenoids alltogether and placing the bleeder valves after the actuators and removing the restrictor pills. Attached is a pic I got from kahrens setup (tanks kahrens).
The question is what setup provides the most responsive as well as the most robust boost control?
More often than not, I see the manual boost/pre-control setup with the bleed valves in between the turbo pipes and the actuators, basically replacing the restrictor pills. This is how it is shown on Rob's site http://robrobinette.com/boost_controller.htm and many other sites. This setup keeps the ecu/solenoids in the loop.
The other setup is bypassing the ecu/solenoids alltogether and placing the bleeder valves after the actuators and removing the restrictor pills. Attached is a pic I got from kahrens setup (tanks kahrens).
The question is what setup provides the most responsive as well as the most robust boost control?
Chimera Driver
Joined: Jul 2001
Posts: 1,334
Likes: 0
From: Birmingham, AL
Both SPOautos and myself have decided to run bleeder valves on BOTH sides of the wg actuator. Since my car is the only one running at present, 
, I'll comment.
We felt you had better adjustability if you ran a bleeder valve on both sides and eliminated the solenoid/ecu altogether. So far, it seems to be true. The IN side of the solenoid is what adjusts your boost response. The smaller the opening, the faster the reponse but the better chance for a boost spike. The larger the opening, the slower the boost response, but you won't see any spikes. The OUT side controls your max boost. Close the valve and your max boost goes down, open it and the max boost goes up. By the way, I have the OUT valve vented to atmosphere in case you were going to ask if it's plumbed back in somewhere.
This seems to be the best of both worlds. It gives me boost response tuneability as well as being able to set the max boost.
As of now I have the IN side about 1/4 turn from fully closed and the OUT side about 2 turns from fully closed and I'm seeing about 13psi.
, I'll comment. We felt you had better adjustability if you ran a bleeder valve on both sides and eliminated the solenoid/ecu altogether. So far, it seems to be true. The IN side of the solenoid is what adjusts your boost response. The smaller the opening, the faster the reponse but the better chance for a boost spike. The larger the opening, the slower the boost response, but you won't see any spikes. The OUT side controls your max boost. Close the valve and your max boost goes down, open it and the max boost goes up. By the way, I have the OUT valve vented to atmosphere in case you were going to ask if it's plumbed back in somewhere.
This seems to be the best of both worlds. It gives me boost response tuneability as well as being able to set the max boost.
As of now I have the IN side about 1/4 turn from fully closed and the OUT side about 2 turns from fully closed and I'm seeing about 13psi.
Chimera Driver
Joined: Jul 2001
Posts: 1,334
Likes: 0
From: Birmingham, AL
Well, I'm running non-seq as is SPOautos, but I don't believe it'll make a difference. You can either leave the pill-line in there or even put a third bleeder valve on there so you can adjust prespool as well.
bump...anyone with a sequential setup have boost/pre-control valves with the ecu out of the loop?
how is your setup? how did it help the boost/transition pattern?
how is your setup? how did it help the boost/transition pattern?
Senior Member
Joined: Nov 2001
Posts: 318
Likes: 0
From: Nowhere
I'm running daws for WG and bleed valve for PC with out
running solenoid valve.
I tried PC bleed valve without pill but it was really sensitive to control so I put some restrictor pills.
I think it works OK.
running solenoid valve.
I tried PC bleed valve without pill but it was really sensitive to control so I put some restrictor pills.
I think it works OK.
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There and back again
Joined: Feb 2001
Posts: 967
Likes: 0
From: Camarillo, Ca
I also have the dual valves without ECU on a full non sequential setup, and so far so good.
I have been playing with the idea of teeing in the stock vacuum chamber (very large) into the boost control lines to further delay the fill-up of the waste gate actuator. First, I need to try closing off the inlet side of the actuator completely and go for a third/fourth gear drive to see what kind of increase could actually be felt.
Right now, unless you are above 3500 RPM, boost response is very slugish.
So, we'll see. I'll keep you guys updated.
I have been playing with the idea of teeing in the stock vacuum chamber (very large) into the boost control lines to further delay the fill-up of the waste gate actuator. First, I need to try closing off the inlet side of the actuator completely and go for a third/fourth gear drive to see what kind of increase could actually be felt.
Right now, unless you are above 3500 RPM, boost response is very slugish.
So, we'll see. I'll keep you guys updated.
