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Old 06-10-2003, 03:32 PM   #1
Hojai
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Member#: 2190
Join Date: Aug 2000
Location: Richmond, Canada
Default Need some help with setting up the AVC-R

i want to set mode A and B as 1 bar and 0.7 bar but for mode A it overboosts and for B, it underboosts........

why's that?
by the way it was fine before and suddenly it overboosts/underboosts
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Old 06-10-2003, 06:39 PM   #2
Darshu
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Member#: 1676
Join Date: Jun 2000
Chapter/Region: NESIC
Location: Exile in Norcal
Vehicle:
98RS w/ EJ257/Dom
2014 Tesla Model S P85

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Do you have the F/B Speed set to 5 or so in all gears? Also, you should try and bump the duty cycle setting [b] up and down on [A] until the boost gets closer to your target.
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Old 06-10-2003, 08:45 PM   #3
Hojai
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Location: Richmond, Canada
Default

Cyl Spd Thr
4 4 up
<don't know what is "sensor sel"?>
Gear Judge
1=120, 2=75, 3=50, 4=35, 5=25 N/S=255
Graph Scale
Bs=2.0, Ne=8000, Sp=240
Sensor Check
Bost=1.528V, Thrt=0.664V, SCSW=off
(when i turn ignition to ON)
VFD Bright
Day=90, Dim=60, Nig=20
<don't know what is "initialize"?>

Mode B
Bost=0.7
Duty=27%
Ne point
from 3000 to 6500rpm with 500rpm increment
F/B speed
all 3
Learning gear
all 0 (what is learning gear?)
Start duty
all 0%

Mode A
Bost=1.0
Duty=28%
Ne point
2500, 3000, 3500, 4000, 4500, 5500, 6500, 7500
F/B speed
all 3
Learning gear
all 0
Start duty
+32%, +33%, +33%, +32%, +32%

I did a search and found something here but i don't understand
http://forums.nasioc.com/forums/show...highlight=AVCR
What is learning gear?
i don't know why the system always changes suddenly. Like i was not overboost or underboost before and suddenly 3 weeks later the car overboosts without changing anything to the AVC-R
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Old 06-10-2003, 11:01 PM   #4
Darshu
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Member#: 1676
Join Date: Jun 2000
Chapter/Region: NESIC
Location: Exile in Norcal
Vehicle:
98RS w/ EJ257/Dom
2014 Tesla Model S P85

Default

yeah here do this:

First set Start duty to 0 everywhere, that just messes things up. You use Start duty to control boost spikes on initial throttle tip-in. You can play with that once you've got your boost steady.
set all your F/B Speed values to 6
set Duty in mode B as low as it will go
set Duty in mode A to like 45%.


Get on the highway and put it in 5th at about 60mph and floor it. If you overshoot and it doesn't adjust to get the boost you want, lower the Duty setting. If it undershoots and can't hit the boost level you want, raise it.

The reason it's boosting differently now? The weather changed and your F/B Speed and Start duty settings aren't configured right to let the boost controller work like it should.
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Old 06-11-2003, 02:13 AM   #5
Hojai
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Location: Richmond, Canada
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what is the meaning for the start duty?
i don't understand what is the meaning of controlling boost spikes on initial throttle tip-in?
how to play with start duty after i get a steady boost?
actually the start duty i have was set by my mechanic when i installed the AVC-R in summer............was that a good set?
How come i heard some ppl setting the F/B to 3?
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Old 06-11-2003, 09:45 AM   #6
Darshu
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Join Date: Jun 2000
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Location: Exile in Norcal
Vehicle:
98RS w/ EJ257/Dom
2014 Tesla Model S P85

Default

F/B Speed controls how agressively the AVC-R adjusts solenoid duty cycle to achieve the proper boost level.

Start Duty forces a certain duty cycle start-point in a given gear. This setting is intended to allow you to control boost response in each individual gear -- for example, if you're worried about boost spiking in first and second gear, you can set your start duty cycle to a few percent negative to make boost spool up more slowly in those gears.

You shouldn't try to use start duty until you've got your boost levels where you want them though. You'll end up getting erratic boost response like you describe.
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Old 06-11-2003, 04:06 PM   #7
Hojai
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Location: Richmond, Canada
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oh........so the F/B should not be worried about right?
like you said, if i want the boost to come faster in 1st and 2nd gear then i have to set the start duty for 1st and 2nd gear to a positive number......but is there any side effect of setting a positive number?
What about the learning gear?
sometimes i see "***" for the duty cycle for mode A and B why's that? others say this is when the controller is learning?

Thanks for your help
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Old 06-11-2003, 04:29 PM   #8
Darshu
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Join Date: Jun 2000
Chapter/Region: NESIC
Location: Exile in Norcal
Vehicle:
98RS w/ EJ257/Dom
2014 Tesla Model S P85

Default

Generally you set the F/B speed values once and leave them alone.

If setting the Start Duty cycle to a higher value gets you the boost response you're looking for, it shouldn't be a problem -- you should just try and get as close to the boost response you want without the Start Duty cycle enabled and _then_ try and fine tune it later.

The *** under duty cycle does mean that the controller is learning. If you change the cuty cycle settings under the main screen, it will reset your learned values though, which will change boost repsonse until it re-learns.
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Old 06-11-2003, 09:46 PM   #9
Hojai
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Location: Richmond, Canada
Default

Thanks a lot..............
i kind of understand how the F/B and Start Duty work but don't know about the Learning Gear?
Right now my learning gears are all 0............what does that mean?
if i change the Duty value below the Boost then the system has to learn again and all the Start Duty and Learning Gear will change automatically?
How long does it take the system to learn?
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Old 06-12-2003, 01:26 PM   #10
Darshu
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Member#: 1676
Join Date: Jun 2000
Chapter/Region: NESIC
Location: Exile in Norcal
Vehicle:
98RS w/ EJ257/Dom
2014 Tesla Model S P85

Default

Learning Gear only has two values: 0 for on and X for off. You want them all set to 0 if you want it to try and learn to control the boost curve in a given gear.

it should only take 5-10 seconds for the boost controller to lock in on the right boost levels in any given gear. It should also re-learn if the weather changes and it overboosts initially.
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Old 06-13-2003, 04:05 AM   #11
Hojai
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oh......so most people set the learning to ON .......

thanks a lot
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Old 06-24-2003, 09:14 PM   #12
Hojai
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Location: Richmond, Canada
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Finally i have time to set up the AVC-R today. Anyways, i was setting up the mode B for 0.7 bar and i set all F/B to 6. I put in 5th gear and floor it while i set the duty to 30%, the needle of the boost gauge was kind of shaking at 0.5 bar and moved up to 0.6 very slowly and stop there.
I tried to floor it in 3rd and 4th gear also and got the same result

do you have an idea what's happened?
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Old 06-26-2003, 01:10 AM   #13
Hojai
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Location: Richmond, Canada
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someone help plzzzzzzz
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Old 06-26-2003, 06:53 AM   #14
Darshu
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Member#: 1676
Join Date: Jun 2000
Chapter/Region: NESIC
Location: Exile in Norcal
Vehicle:
98RS w/ EJ257/Dom
2014 Tesla Model S P85

Default

your duty cycle is too low. raise it until your boost responds like you want it to.
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Old 06-26-2003, 07:44 PM   #15
Hojai
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even 30% for 0.7 bar is too low?
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Old 06-26-2003, 09:22 PM   #16
Darshu
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Member#: 1676
Join Date: Jun 2000
Chapter/Region: NESIC
Location: Exile in Norcal
Vehicle:
98RS w/ EJ257/Dom
2014 Tesla Model S P85

Default

It depends on the car and the turbo. Obviously, it's too low for your car and turbo.
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Old 06-26-2003, 11:03 PM   #17
Hojai
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Location: Richmond, Canada
Default

but how come the needle of the boost gauge was kind of shaking at 0.5 bar and seemed like the boost didn't want to go over 0.5 bar.............by the way i am using the Deltawastegate from Minnam kit...........would that be a potential problem..............
i just read a thread about this wastegate in this forum and most ppl don't like this............

Again thanks for your help..........................always here to help me with the AVC-R
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