Are you suggesting I start using the WGDC tables below 5500RPM? If so, that's not what I'm aiming for here. I'm merely trying to add the BCS to help rid myself of so much taper... but according to the post I made just today it seems the layout that Cookie suggested is not working. I may try "Tee-ing" the BCS off of the line that feeds the MBC rather than behind it... but race day is quickly approaching so this testing may need to be postponed in lieu of preparation.

Anyonoe have a comment on the overlaid boost graphs above? Any idea why this didn't work at all? I've confirmed that the BCS does work by my previous tests... is it just because it can't bleed off enough air? Why can't I get ECU-boost top end boost control results? Maybe I'll need to have Bryan email me some BCS parameters and see if I can get the ECU-boost to give me the top end I want then perhaps I can reverse engineer an answer. I have no intention of going fully ECU-based boost.

 

i think the problem here is that your expecting the BCS to do alot of work all of a sudden, im telling you just for sh*ts and giggles try phasing it in like i said and see what happens, i think gradually using the BCS from say 4500 all the way up would produce a smoother hold on power along with your goal of keeping the boost up, bottom line is that turbo is gunna fall off up top no matter what you do i dont understand why you wanna run 30psi tapering to 19 when i run 24psi that tapers to 23, i understand 30psi is 30psi but it only holds for such a short time why not try lowering it a little and see if the taper calms down and isnt as aggressive


::edit::
you may want to try getting an uprated actuator like the forge unit it will hold the boost longer

 

Also, make sure you aren't using any pills in the configuration you are now using...

 

Question: What do your desired load & error correction tables look like?

You should start logging WGDC so you can see what the BCS is actually doing.

For your EvoScan Data.xml:

 

hmmm... I will try to log WGDC... but I'm using ECU+ not evoscan. Let me see what I can do.

 

Chab: see post 14, I am using 0-100 there and the BCS seems to react fine. The ECU interpolates between cells so 0-100 isn't a big deal over a 500rpm range. (at 5250 it is 50% WGDC)

fost: I have no other "pills" in the system right now at all.

I think one of the following is occuring:
1. The BCS simply can't bleed enough off
2. The extra bleed is nullified by the MBC opening more at higher boost
3. Something else is going on that is giving me this horrible taper... I don't think its an exhaust leak b/c I just revamped the whole exhaust myself.

 

The setup should work...

Imagine this...

You have two cars, one uses MBC, the other uses stock BCS...

You set the MBC car to match the stock BCS car so they run the EXACT same amount of boost.

What can you conclude?

The MBC Output on Car #1 = the restricted compressor outlet on Car #2, minus the BCS bleed.

 

True, problem is though you CANT set the MBC car to the same BOOST CURVE as the BCS car. Sure, you can hit the same peak boost, problem is though that the spring in the MBC is linear, and I think the forces acting against the WG are more exponential. Since the BCS is adjustable throughout the rev range it can compensate for the exponential force against the WG.

Think about this: Those of you who use the GM (and probably the OE BCS) have to increase WGDC after peak torque right? Is it perfectly linear? Probably not. If you were to try to keep a flat boost curve (or as flat as possible) after peak torque you would have to add a LOT of duty cycle. The MBC cannot do this... which is why I agree with you that this should work because the BCS should offer that extra "duty cycle" where the MBC cannot compensate. But my testing is proving otherwise.... Maybe we misunderstand the pills and their placement a bit?

 

Okay, so testing goes on hold for a while...

At CMP this past weekend I blew out my turbo gasket so now I only spool to a max of 15psi, and at 5K!!!! Also, out of nowhere my starter doesn't work at all. Great weekend at the races other than that. While I'm looking through logs I may get a chance to figure out some WGDC correlation, since I logged it all weekend.