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HOW TO - Control boost using ECUFLash and 3 port GM boost solenoid

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Old Nov 16, 2007 | 02:47 PM
  #211  
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Originally Posted by 76kcfdeng
OK, I am getting ready to do this. I am controlling boost with ECU and 65 Turbo pill. I am into stealth and hate cutting or tapping into stock wiring. I saw a post earlier that the opposite plug for the BCS is not available. Today I spent some time in the local Pick your Part looking for a solution. I found IT! I took the pressure sensor off the aircon line from a 90 Galant, any late model Mitsu should work. The 1 on our cars is the same. This has the same plug as the BCS. I used a hacksaw to remove the metal around the sensor and then removed the innards of the sensor. You then have to pry out and trim the contacts, solder on the pigtail and resistor. I will use some silicone or epoxy inside the area where the soldered contacts are, you will see that it is a void in the back of the plug. I also got the pigtail for the GM 3 port, they are common on gm cars. I will try to post pics later.
Glen
Nice. I know Razorlab has been looking for a plug to use.
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Old Nov 19, 2007 | 03:28 PM
  #212  
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OK, I have the 3 port in and tuned, 1.5 bar peak and holding 1.3. The boost holds flat until about 6000 then tapers down. I tuned it by zeroing the TBEC and tuning with the WGDC. Got a nice curve and then adjusted the BDEL and BCLO to equal the loads I was seeing. The only problem I have is as that like others before me as soon as I add any upward correction in the TBEC my boost and loads shoot way beyond the target. I tried lowering the BDEL a little and then a lot and still went beyond the target. It was raising the WGDC even though I was above the desired engine load and past the the boost limit. I had no fuel cut either, boost limit at 265 and I hit 290 once before I backed out of it. So I have the upward correction zeroed and it works fine. Anyone get this figured out yet? I had an easier time dialing it in with a 65 pill.
Just for information I have the 3 port plugged in to the stock BCS plug as I described 2 posts back, works great.
Glen
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Old Nov 19, 2007 | 03:31 PM
  #213  
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Originally Posted by 76kcfdeng
OK, I have the 3 port in and tuned, 1.5 bar peak and holding 1.3. The boost holds flat until about 6000 then tapers down. I tuned it by zeroing the TBEC and tuning with the WGDC. Got a nice curve and then adjusted the BDEL and BCLO to equal the loads I was seeing. The only problem I have is as that like others before me as soon as I add any upward correction in the TBEC my boost and loads shoot way beyond the target. I tried lowering the BDEL a little and then a lot and still went beyond the target. It was raising the WGDC even though I was above the desired engine load and past the the boost limit. I had no fuel cut either, boost limit at 265 and I hit 290 once before I backed out of it. So I have the upward correction zeroed and it works fine. Anyone get this figured out yet? I had an easier time dialing it in with a 65 pill.
Just for information I have the 3 port plugged in to the stock BCS plug as I described 2 posts back, works great.
Glen
It is because boost follows a different, usually lower load (this is why additive correction is being hit with your BDEL+BCLO set to 2byte load) than the normal 2byte load everyone logs. You can switch the boost to follow the normal 2byte load and this makes it much more stable, in my experience at least.
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Old Nov 19, 2007 | 03:36 PM
  #214  
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Originally Posted by 76kcfdeng
OK, I have the 3 port in and tuned, 1.5 bar peak and holding 1.3. The boost holds flat until about 6000 then tapers down. I tuned it by zeroing the TBEC and tuning with the WGDC. Got a nice curve and then adjusted the BDEL and BCLO to equal the loads I was seeing. The only problem I have is as that like others before me as soon as I add any upward correction in the TBEC my boost and loads shoot way beyond the target. I tried lowering the BDEL a little and then a lot and still went beyond the target. It was raising the WGDC even though I was above the desired engine load and past the the boost limit. I had no fuel cut either, boost limit at 265 and I hit 290 once before I backed out of it. So I have the upward correction zeroed and it works fine. Anyone get this figured out yet? I had an easier time dialing it in with a 65 pill.
Just for information I have the 3 port plugged in to the stock BCS plug as I described 2 posts back, works great.
Glen
Try putting a zero in the -20 box.
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Old Nov 19, 2007 | 04:06 PM
  #215  
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Thanks razorlab, it seemed like it was following a different load table. I am logging 2 byte so which load table do i follow?
Evo_kid, I will try that, I was thinking about lowering all of the minus corrections since it seemed like they were battling each other.
Thanks, Glen
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Old Nov 19, 2007 | 04:13 PM
  #216  
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From mrfred here:

https://www.evolutionm.net/forums/sh...d.php?t=288408

Example:

USDM Evo IX 88590015

<table name="Variable for Boost Control" category="Turbo" address="41E12" type="1D" level="1" scaling="Hex16"/>

Instructions for ECUFlash


Variable for boost control: Stock will read 6B48. Change it to 6B42. The table is in hex format, so you will have to enter it as 0x6AEC.

Just use the "Variable for Boost Control" above and switching it from stock 6B48 to 6AEC (using hex format) will switch the load the boost system follows to normal 2byte load.

Last edited by razorlab; Nov 19, 2007 at 07:51 PM.
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Old Nov 19, 2007 | 06:06 PM
  #217  
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Originally Posted by razorlab
From mrfred here:

https://www.evolutionm.net/forums/sh...d.php?t=288408

Example:

USDM Evo IX 88590015

<table name="Variable for Boost Control" category="Turbo" address="41E12" type="1D" level="1" scaling="Hex16"/>

Instructions for ECUFlash


Variable for boost control: Stock will read 6B48. Change it to 6AEC. The table is in hex format, so you will have to enter it as 0x6AEC.

Just use the "Variable for Boost Control" above and switching it from stock 6B48 to 6AEC (using hex format) will switch the load the boost system follows to normal 2byte load.
Yeah, do this too. It will make the boost system follow the same load that 2byte load reads.
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Old Nov 19, 2007 | 06:47 PM
  #218  
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Thanks guys, did all that stuff and I will try it out tomorrow. That should make things a lot easier.
Glen
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Old Nov 19, 2007 | 07:45 PM
  #219  
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Originally Posted by razorlab
From mrfred here:

https://www.evolutionm.net/forums/sh...d.php?t=288408

Example:

USDM Evo IX 88590015

<table name="Variable for Boost Control" category="Turbo" address="41E12" type="1D" level="1" scaling="Hex16"/>

Instructions for ECUFlash


Variable for boost control: Stock will read 6B48. Change it to 6AEC. The table is in hex format, so you will have to enter it as 0x6AEC.

Just use the "Variable for Boost Control" above and switching it from stock 6B48 to 6AEC (using hex format) will switch the load the boost system follows to normal 2byte load.
razorlab, 6AEC is for direct boost control. 6B42 is the recommended 2-byte load to switch to for load-based boost control. You had me worried for a minute that I wrote the wrong address if my instructions. Just looked though, and its 6B42 as it should be. :-)
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Old Nov 19, 2007 | 07:51 PM
  #220  
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Originally Posted by mrfred
razorlab, 6AEC is for direct boost control. 6B42 is the recommended 2-byte load to switch to for load-based boost control. You had me worried for a minute that I wrote the wrong address if my instructions. Just looked though, and its 6B42 as it should be. :-)

oops! You are right I was just copy pasting from the wrong thread!
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Old Nov 19, 2007 | 09:45 PM
  #221  
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Originally Posted by razorlab
oops! You are right I was just copy pasting from the wrong thread!
Too many how-to's out there! :-)
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Old Nov 19, 2007 | 11:41 PM
  #222  
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Yeah even if you log WGDC it "Seems" to max out at 100. But if you look at your TBEC when its trying to drag it down you end up with values where it clearly is ending up above 100.

So zeroing -20 is a good bet...in a real WOT case you probably never hit a place where you are -20 and still WOT if you tune BDEL and TBEC correctly.
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Old Nov 20, 2007 | 07:05 AM
  #223  
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mrfred, I went to the link razorlab put up which was the load based write up. So I had the right settings. I am going to try it this morning. I am using the TBEC settings recommended in that post. Thanks for all the great info and help.
Glen
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Old Nov 27, 2007 | 04:58 AM
  #224  
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Sorry, but in post #2 - Step 6 I can not see the vacuum lines diagram. Could someone please repost it?
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Old Nov 27, 2007 | 05:42 AM
  #225  
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Originally Posted by al\lupo
Sorry, but in post #2 - Step 6 I can not see the vacuum lines diagram. Could someone please repost it?
OK, I went and looked all over for the missing pic and could not find it.

The pic with the solenoid gives you all the info you need.
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