crispeed

I have been asked for this information a lot as of late so here goes--->

Closed Loop Boost Control
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TWG FREQUENCY:
Typical frequency the wastegate will operate at. Typical frequency for the Haltech solenoid is 33hz.
START DUTY CYCLE:
This is the duty cycle the wastegate will go to when closed loop boost control begins. This duty cycle should cause the boost to read somewhere below the target boost level. If this is too high then the boost will over shoot the target boost level before it returns to the target. If too low the boost may dip down a bit before being controlled.
START DUTY BY MAP:
When selected it will ignore the 'Start Duty Cycle' value above and base it off the 'Start Duty Map'.
START DUYT MAP:
Output Start Duty Cycle vs Target Boost level. This map can be used when the Target Boost level that the boost controller is aiming for changes each time it goes to control boost. For example when using the trim control for boost control or for Boost By Gear correction.
BOOST TARGET MAP:
Output Target Boost vs RPM. Offers different target boost levels over the range of RPM.

SETUP of Closed Loop Boost Control:
1. Set the 'Closed Loop Boost Target Map' at the boost level you want to run across the whole rpm range.
2. Setup the closed loop boost control in the Auxilary Output page. Click the 'Adjust PID Settings' edit button and check that the Proportional, Integral and Derivative Coefficients are all set to their default values.(Prop.- 50%, INT.-50% and Der.-0%).
3. Set the frequency of the turbo wasgate solenoid in the 'TWG Frequency' field. Haltech boost control solenoid is 33Hz.
4. Set the 'Start Duty Cycle' to a duty cycle that should get you close to your boost target.
5. Put the engine under sufficent load (ie on the dyno) to get it to reach the target boost level. Watch to see that it does not over boost. Also make note of the duty cycle that the wastegate runs when at target boost levels, this can be viewed in the 'Auxilary Output Data page'.
It the boost level exceeds the target boost level then reduce 'Start Duty Cycle'. If the boost dips down before going back up the try increasing 'Start Duty Cycle'.
6. If the boost level ocillates around the boost target then reduce the Proportional and Integral values until the boost is more stable. Proportional and Integral values can be reduced by the same amount.
Setup Of Start Duty Map:
If the boost target varies each time the engine goes on boost by either boost trim or boost by gear correction then it's a good idea to setup the 'Start Duty Map'
7. At first leave the 'Start Duty By Map' un-ticked. Set the 'Cloosed Loop Boost Target Map' to control somwhere above boost if only running off the wastegate spring.
8. Repeat step 4 & 5 and record the 'Start Duty Cycle' and the corresponding boost target.
9.Increment the 'Closed Loop Boost Target Map' by about 3.5psi(25kpa) and repeat untill you reach the maximum boost the engine is going to run
10. Fill out the 'Start Duty Map' with the data recorded. Run a duty cycle of zero below the spring pressure. Run a duty cycle of the maximum recorded 'Start Duty Cycle' above the maximum boost the engine is running.
11. Tick the 'Start Duty BY Map' in the closed loop boost control setup.
12. (Optional) . To fine tune the 'Start Duty map' setup a closed loop boost control trim under the Anolog Input Function Page and load up the engine at different boost level to make sure that the boost control runs smoothly.

gear ratios setup.
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In the 'Options Menu' under 'Gear Ratios' you'll find the table setup.
In the 'Gear Ratio' colum, gear ratios are entered as Speed/MPH for every gear at 1000rpm. For example in first gear at 1000rpm set the corresponding speed/mph in the table. Do this for every gear.
In the Open Loop Boost Correction (%) colum set the 'Duty Cycle' for the wastegate at the corresponding boost level in each gear.
In the Closed Loop Boost Correction (PSI) colum, set the maximum boost in the gears that you are going to run that boost level at. For every other gear that you want to run less boost the amount entered must be a negative number from the maximum set in the previous gears. For example if you're running 20 psi in 5th gear and want to run 15 psi in 4th gear and 10 psi in 3rd and 2nd gear then you enter 20 psi for 5th gear, -5psi for 4th gear and -10psi for 3rd and 2nd gear.

Gohan3rdrift

iTrader: (11)

STICKY!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
if not it's in my favorites already anyways....

crispeed

Additional updates for closed loop boost control using the latest 1.71 software version.

New boost control threshold value, 'Control Point Before Target' has to be set for closed loop boost control to keep working. This value determines the point below the target boost level where control begins. This used to be fixed at 20 kPa. This change has been added for some more extreme applications of boost control where control needs to happen earlier to stop over boosting. (Default value: 20 kPa).

http://www.haltech.com/Beta%20Releas...ol%20Setup.pdf

13B-RX3

iTrader: (2)

I hate to start a new thread so I'll just ask here. No matter what i have tried i still can't get my closed loop boost control to work. Whenever the car starts boosting it instantly goes over 20 PSI and hits the boost cut. I have tried changing the star duty cycle and target map. I even made a tester with an air pressure regulator to see if anything is going on. It seems like it is working as it is supposed to be, when i get close to the preset boost level the valve starts to cycle and release pressure from the top chamber. Then when i increase the pressure the valve vents pressure from the top chamber completely. It seems like that is how it is supposed to operate but when i drive the car it goes straight to the boost cut. I am sure it is a matter of something i am doing wrong but i don't know what. This is the last thing i have to do before i can run the car so any advise is very appreciated.

TIA
Allen

P.S. i am still running 1.62.

crispeed

Assuming you've followed the setup instructions properly then try reducing the 'Proportional Co-eff' and the 'Derivate Co-eff'. Start with a very low setting between 1-5 for both. The 'Derivative Co-eff' should be at zero.

13B-RX3

iTrader: (2)

What about the integral Co-eff?

What is a traditional start duty cycle (dumb question, i know). The reason i ask is i have it set at 5% and it still overshoots the target but not bad enough to hit the cut, by the time i am in second it levels off at the target boost level. I don't have access to a dyno and i am not fast enough to read the duty cycle on the output page . Is there a way to datalog it?

TIA
Allen

crispeed

PC at 5%
IC at 5%
DC at 0%

Instead of trying to look at the dutycycle use the logger.
What's the wastegate spring base pressure?
How to do you have the solenoid hoses routed?

13B-RX3

iTrader: (2)

If i remember right it is a 7.252lb spring (small blue) but i wouldn't swear to it.

I have the sol routed like you suggested. There is a "T" on the compressor housing, one line goes to the bottom of the diaphragm and the other goes to the solenoid and then to the reference port.

Thanks for all you help Chris

13B-RX3

iTrader: (2)

*sigh* Well i still have not got the controller to work as advertised. Right now i have the PC-3 IC-3 DC-0. I have tried as low as 1% start duty cycle and the boost shoots right past 14.7 and hits the cut at 18 in first gear. When it hits the cut i shift into second and the boost then stabilizes where it should be. The only thing that i can think of is that running dual wastegates increases the volume of "control" air enough that just one valve cannot vent it fast enough to keep it from overshooting the target. Has anyone ever had any problems like this or is it just my dumb luck.

I also had an unrelated question. When you have the overboost cut set to ignition cut do the injectors still fire when it is in a cut situation. When Gaby tuned the car he had it set to cut at 18 and resume at 9. It seems like every time i hit the cut it loads up and tries to fowl the plugs.

Thanks for any advise.
Allen

13B-RX3

iTrader: (2)

Took the car to the track again and i still can't control boost even with a manual boost controller. What the hell is going on? Am i just trying to run too low a boost?

crispeed

Does the boost hold steady without any boost controller hooked to the wastegate?
If it does then you have something hooked up wrong or one of your hoses have a leak somewhere.

13B-RX3

iTrader: (2)

It works great without any form of control hooked up. I am just trying to get a little more boost out of it. I ran the boost up to about 16 PSI with a manual controller and it seemed to work ok but i would rather use the haltech is possible. I ordered up a pair of high flowing solenoids so we shall see if that fixes it. Consequently, can i run both solenoids off one channel or do i need to configure another channel for it? Thanks again for all your help Chris!!!

13B-RX3

iTrader: (2)

Well if a picture is worth a thousand words you will love this **** .


By allenrx3, shot with E4300 at 2007-08-08