how-to: ECU-based direct boost control
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From: Tri-Cities, WA // Portland, OR
I think it would be great if you gave it a try with the Vishnu bleeder (and stock pill at the tee and no pill at the BCS side). I don't even look at the boost gauge any more because I know its working. :-)
Anyone know the approximate orifice size of the stock T pill? My has been mia for a few years. I may try the vishnu bleeder as well. Is it what they call the passive boost solenoid emulator? Hell, I'll try em all!
Last edited by FuelsResearch; Jan 21, 2008 at 10:12 AM.
Thread Starter
EvoM Guru
iTrader: (50)
Joined: Mar 2006
Posts: 9,675
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From: Tri-Cities, WA // Portland, OR
Yep, that's the passive boost solenoid emulator. If you can find a metal tee, it would be easy enough to fill in the branch with solder, and then drill a hole to make a bleeder.
Just a note ... I'm doing some testing with a mostly flat BWGDC profile and basically letting the TBEC table control the boost. Results were promising to start, but my car's been down for a week. I'll do some more testing when I get it reassembled.
The only problem I see with it so far is that the stock BCS is a little slow to react and there seems to be a maximum correction that can be applied to the WGDC. I think the GM solenoid and a little more correction delay could help with the response in this situation and the max correction isn't an issue if you set the BWGDC somewhere logical.
The only problem I see with it so far is that the stock BCS is a little slow to react and there seems to be a maximum correction that can be applied to the WGDC. I think the GM solenoid and a little more correction delay could help with the response in this situation and the max correction isn't an issue if you set the BWGDC somewhere logical.
I use a GM 3-port. Don't know if I should add what I have because i'm not using direct boost control, I'm on load-based. But here is my current WGDC table and the boost curve it produces (this error correction off).
Last edited by roger smith; Feb 1, 2008 at 11:17 AM.
Just a note ... I'm doing some testing with a mostly flat BWGDC profile and basically letting the TBEC table control the boost. Results were promising to start, but my car's been down for a week. I'll do some more testing when I get it reassembled.
The only problem I see with it so far is that the stock BCS is a little slow to react and there seems to be a maximum correction that can be applied to the WGDC. I think the GM solenoid and a little more correction delay could help with the response in this situation and the max correction isn't an issue if you set the BWGDC somewhere logical.
The only problem I see with it so far is that the stock BCS is a little slow to react and there seems to be a maximum correction that can be applied to the WGDC. I think the GM solenoid and a little more correction delay could help with the response in this situation and the max correction isn't an issue if you set the BWGDC somewhere logical.
I started on 45% I think because of the weather ... that's why I found the correction limit. I wanted to keep it safe for the initial testing. I was running ~65% or so for my desired load.
Choosing a median BWGDC for all seasons would be the key to avoiding the correction limit ... likely somewhere around 70% as you mentioned.
Choosing a median BWGDC for all seasons would be the key to avoiding the correction limit ... likely somewhere around 70% as you mentioned.
Just a note ... I'm doing some testing with a mostly flat BWGDC profile and basically letting the TBEC table control the boost. Results were promising to start, but my car's been down for a week. I'll do some more testing when I get it reassembled.
The only problem I see with it so far is that the stock BCS is a little slow to react and there seems to be a maximum correction that can be applied to the WGDC. I think the GM solenoid and a little more correction delay could help with the response in this situation and the max correction isn't an issue if you set the BWGDC somewhere logical.
The only problem I see with it so far is that the stock BCS is a little slow to react and there seems to be a maximum correction that can be applied to the WGDC. I think the GM solenoid and a little more correction delay could help with the response in this situation and the max correction isn't an issue if you set the BWGDC somewhere logical.
Last edited by Evo_Jay; Feb 1, 2008 at 12:30 PM.
sept. 16, 07
Yeah, defiantly tune like this. Zero TBEC, use WGDC to get you to your desired boost level, then re induce the TBEC.
The only thing I do different is a run a flat WGDC ie 65s from 3000-7000. I just make sure that the WGDC I use, gets me to my desired peak boost. I then let the correction take away the taper.
The only thing I do different is a run a flat WGDC ie 65s from 3000-7000. I just make sure that the WGDC I use, gets me to my desired peak boost. I then let the correction take away the taper.
I remember your post, but you never really expanded on it much. That's why I'm trying it out now ...
I'm thinking the problem you found with this method is that TBEC doesn't zero out when you let off the throttle ...
I'm thinking the problem you found with this method is that TBEC doesn't zero out when you let off the throttle ...