how-to: ECU-based direct boost control
Oct 8, 2007 | 01:39 PM
#136
Yes, WGDC, WGDC Correction, JDMMap, and Boost Error. I really just got started with the new setup. edited...
This solenoid is not on the stock lines.. it's just between the compressor housing and the wastegate bleeding to atmosphere. I'm not sure if port 3 can be ran back into the intake or not. I think I tried that once and it made the car run weird.
The 4th gear log on here was a mid rpm WOT.. looks like the AEM caught the spike as it's pretty small. Overall I just need to work with it a little more. I only had an hour to play with it that day and had to fix some other things as well while I was out there.
This solenoid is not on the stock lines.. it's just between the compressor housing and the wastegate bleeding to atmosphere. I'm not sure if port 3 can be ran back into the intake or not. I think I tried that once and it made the car run weird.
The 4th gear log on here was a mid rpm WOT.. looks like the AEM caught the spike as it's pretty small. Overall I just need to work with it a little more. I only had an hour to play with it that day and had to fix some other things as well while I was out there.
Sounds like you have your 3port routed correctly as far as no pills or T's involved. Now it just takes a little time to get it all running properly with the tables.
Oct 9, 2007 | 05:19 AM
#137
Yea, boost is logged. I'm just doing preliminary adjustments prior to turning on the error correction. Really I'm just trying to get it very close before even asking the ECU to correct it so it doesnt have as much correction to do. In fact correction and all of that stuff is logged to. I just havent figured out how to add it to my Data Log Lab definition yet.
Oct 9, 2007 | 11:28 AM
#138
What nj and razorlab said, and I'll add a quick summary on my recommended tuning process:
1) Disable the error correction and tune the BWGDC (MWGDC) tables until you reach your target boost profile in 3rd gear only. No need to mess with other gears during this process. Get it as close as you can. As nj said, within +/- 0.5 psi of your target boost is a good goal.
2) Reenable the error correction and see how well it works in 3rd gear. Boost should still be right on the money. Then try 4th gear. The error correction should kick in and keep the boost at your target value. Also try some mid-rpm WOT runs in various gears. You can try my error correction settings as a start, but since you are using different boost control hardware, you may end up having to change the correction table and interval to better suit your setup.
1) Disable the error correction and tune the BWGDC (MWGDC) tables until you reach your target boost profile in 3rd gear only. No need to mess with other gears during this process. Get it as close as you can. As nj said, within +/- 0.5 psi of your target boost is a good goal.
2) Reenable the error correction and see how well it works in 3rd gear. Boost should still be right on the money. Then try 4th gear. The error correction should kick in and keep the boost at your target value. Also try some mid-rpm WOT runs in various gears. You can try my error correction settings as a start, but since you are using different boost control hardware, you may end up having to change the correction table and interval to better suit your setup.
Oct 9, 2007 | 11:46 AM
#139
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So i got a question. Basically the boost is controlled through BWGDC. And the other 3 table are used to correct the duty. And so if the error correction is set to 0, the 2 boost tables aren't even active, right? You can put whatever you'd like in there, it wouldn't matter. I'm 99.9% sure that's how it works, just wanna be certain.
Oct 11, 2007 | 02:05 PM
#140
This might have been covered already, but I couldn't find it searching in this thread. Would there be any issue of using this method with the GM boost solenoid? Can the stock BCS hold 26-28lbs? I was wondering if this setup could be used to control boost on ix turbo with meth. Thanks
Oct 11, 2007 | 02:07 PM
#141
Oct 11, 2007 | 02:11 PM
#142
Nov 15, 2007 | 11:24 AM
#146
So since this is not implemented yet, i have a question for people using this boost control - how long (rpmwise) do you hold the WGDC at 100%? I, for one (with GM 3-port), have it at 100% at 2750 and then at 60% at 3000, because if i step on it in 5th i get full boost right around 3000, so i don't want to overboost, error correction won't be fast enough. But then when i do a pull in 3rd, it takes longer to reach full boost and the fact that WDGC goes down to 60 at 3000rpm makes the spool longer because the WG is partially open....
Any solutions for venting all the air with solenoid during spool-up?
Nov 15, 2007 | 08:45 PM
#147
You could lower the interval for the boost correction and that would help catch overboost a bit quicker. I don't think using any load based solution is going to be able to do much else for you.
Last edited by codgi; Nov 16, 2007 at 12:24 AM.
Nov 21, 2007 | 04:43 PM
#150
I dont have my duty at 100%. I basically have it almost solid 65.5 except to help with the taper a little bit but I have the AEM solenoid instead of the gm3port. Solid 70 duty gave me 25psi but I lowered it down for daily driving.
Last edited by Mr. Evo IX; Nov 21, 2007 at 04:47 PM.