Electronic Boost Control Issue

[hockey930]

I have just followed the directions posted by aspirator and sucessfully installed ms electronic boost control. (well asher did most of it....) It seems to work great if you are running though the gears, however in high load low rpm conditions it just boosts like no tomorrow.(ex flooring it at 2200 rpm in overdrive) My 9mm rods don't like 20+ psi. Has anyone else run into this problem?
Eamonn

[The Aspirator]

Humm, well I can't say that I've really hogged on it from 2k in 5th (clutch slip), but I've never had ANY problems with boost spikes since I installed it in September. I have beat the heck out of it in all other gears though, like flooring it from 1000rpm, and I've put 10,000 miles on it.

What's your turbo situation like? Maybe you don't have enough flapper? I have a very ported 90+, a ported .63 turbine housing with the WG hole opened up, and I'm using the 32mm flapper from a 740. Ford .60 compressor, 3" exhaust. Right now I'm just running 14psi, but I was running 18 recently.

[hockey930]

this thing is baffeling me. I put on mbc back on and it seems to work just fine with minimul boost spike. But with the ebc it doesn't even seem to matter what I set the boost map too, it just goes nuts, even in 4th gear low rpm the boost seems to shoot past 20lbs. Who else has this setup?

[740ATL]

Eamonn, what are your boost control settings in MS? What duty cycle settings do you have?

[RvolvoR]

Eamonn, what are your boost control settings in MS? What duty cycle settings do you have?

same settings john uses

[The Aspirator]

Got all these good and proper?
http://trollmedia.com/cars/boost-control02.jpg

[RvolvoR]

Got all these good and proper?
http://trollmedia.com/cars/boost-control02.jpg

to a T

[benflynn]

say f it and get an evc, fuzzy logic

[RvolvoR]

say f it and get an evc, fuzzy logic

eff that, you dont got boost tables

[740ATL]

Can you post a datalog of what the MAP looks like? A screenshot'll do.

[The Aspirator]

Well then you can just work around the spike :) , that's the whole awesomeness with MS-EBC. So in your boost map set the 2000-2500 bins to 20% duty cycle, or even 0% (opens the solenoid and runs off the WG only). Then after your spike put the DC back to like 60% for the rest of the table.

Ohh and also make sure that your boost table is the "Boost Duty Targets", and not the "Boost Kpa Targets" table.

[740ATL]

Well then you can just work around the spike :) , that's the whole awesomeness with MS-EBC. So in your boost map set the 2000-2500 bins to 20% duty cycle, or even 0% (opens the solenoid and runs off the WG only). Then after your spike put the DC back to like 60% for the rest of the table.

Ohh and also make sure that your boost table is the "Boost Duty Targets", and not the "Boost Kpa Targets" table.

haha! I did that once.

[RvolvoR]

Well then you can just work around the spike :) , that's the whole awesomeness with MS-EBC. So in your boost map set the 2000-2500 bins to 20% duty cycle, or even 0% (opens the solenoid and runs off the WG only). Then after your spike put the DC back to like 60% for the rest of the table.

Ohh and also make sure that your boost table is the "Boost Duty Targets", and not the "Boost Kpa Targets" table.

we made sure of that, plus it wouldnt matter with those settings if you screwed with it, cause closed loop mode isnt even gonna work

oh yeah, and the AFR target table is effin sweeeet

[hockey930]

I am still very confused by this whole thing.

[qwkswede]

I didn't read what kind of control valve you are using. But, if you disconnect the plug from the boost control valve you should get your base setting of your wastegate actuator spring. If its a volvo actuator, that means something like 7 psi I think. Does that work OK even with the new plumbing to the control valve? Its a good safety net so that you don't overboost if a wire breaks or the valve fails(hopefully). The valve should fail in the closed position, and not bleed any boost signal to the actuator. This should also give your base setting.

Sorry if thats all obvious stuff, but thats where I would start if my car was overboosting like mad.

[The Aspirator]

Ever figure it out?