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Old 11-14-2006, 10:48 AM   #1
TheShad0w
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2005 Saabaru 92-x
AWDTuning.com

Default Aftermarket BCS tuning.

G'Morning everyone... This topic is basically regarding a problem I'm trying to iron out regarding tuning for the GM BCS for a td04 "on edge". As we all know when dealing with tuning on the edge of a turbo's efficiency range the sensitivity to wastegate changes is magnified. so in my case, I'm trying to tune for 19 psi (stable sub 3500) tapering to 14.5 psi and red line. My problem is at this level wastegate changes greatly effect the turbo. I substantial spikes in higher gears, and then isolations because of the spikes. I'm using enginuity to tune and I have played with several adjustments over the last week, esp on gain/continuous settings. I've gotten close to where I like but its far from perfect. Any help would be greatly appreciated, Thanks!

Notes:
Mostly stock WRX with a catless exhaust and airbox removal.
The BCS is installed correctly, thanks to Freon for his great write up.
Wastegate arm has been reverted to its stock position after BCS install.
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Old 11-14-2006, 12:17 PM   #2
akira02rex
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You will always see spiking in higher gears because we can't tune the boost with our ECU via load. It is TPS based only .
I may install the GM bcs sometime..or just buy a standalone electronic boost controller.

I am currently running the stock BCS and I can hold 20psi in the midrange and 19 at redline.
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Old 11-14-2006, 03:53 PM   #3
bluescoobywagon
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2011 WRX - 285s on 18x9.5

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It's possible to tune out the spikes, but you really need to dork with it. Just 1 week isn't enough. You may want to try loosening the wastegate a turn.

What injectors are you running? I noticed that when I turn up my boost and it tapers to a higher level (like 14.5) at redline that it pulls timing. I can't spray enough fuel to keep it cool with the stock injectors. I'm running up to 98% IDC as I approach redline at 13.5 psi.
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Old 11-14-2006, 04:00 PM   #4
bluescoobywagon
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Here's my Proportional Gain:
Code:
-2.94	-1.70	-0.77	0.00	0.31	0.77	1.70	2.94	4.51
-5.50	-2.00	-0.79	0.00	1.00	2.00	5.00	15.00	40.00
And here's my Proportional Continuous:
Code:
-2.94	-1.70	-0.77	0.00	0.31	0.77	1.70	2.94	4.51
-1.50	-0.50	-0.20	0.00	0.10	0.25	1.00	3.00	10.00
If you have a DBW ECU, your tables won't match.
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Old 11-14-2006, 04:13 PM   #5
TheShad0w
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blue.. I have not logged my injector duty cycles yet since the change, but I did have to pull a few degrees and change my fuel setting to keep the car happy. I would imagine that they are pretty high though, injector scaling is set to 420. previously I was able to keep it right at 14.0-13.9 with the stock BCS, but I had the WG arm reallllly tight. it seems pretty happy up to 14.8 before things really begin getting warm.

I'm actually pretty surprised on how high the turbo wants to run high boost into the higher RPM range sometimes staying in the high 17's to 5000, (even though thats not the target). This was just on my initial runs. Thanks for your tables though, while not a direct match, anything to give me some more perspective is a big help.

I'll be doing my TGV's and injector mods after Christmas(recovering from shoulder surgey). So I'm not too worried about maxing the injectors out for the time being.
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