Beta Code Boost Control Issues

Maddog6961 · Post by **Maddog6961** » Sun Jul 15, 2007 12:25 pm

I just got my boost control setup. I am using pin JS11 and using all of the parts for MS1 extra boost control. I am outputting via one of the idle stepper motor pins on the ECU. I am also using the GM solenoid valve.

Today I turned it on and was trying to run in open loop mode. I was slowly increasing the duty cycle to find where the valve would start changing boost. I didn't get very far though. By the time I had the duty cycle up at 25%, I noticed my engine was running extremely rich. I immediately turned boost control off and the engine began to run normally again at my normal AFRs. The boost control duty cycle is causing my injector pulse widths to increase. Whats the deal with this?

I datalogged the strange behavior. In the first half of the datalog, boost control is on. In the second half of the log, boost control is off. You can see where I turned it off because there is a sharp drop of RPMs where I burned to the ECU. This is located at 5943.913 seconds.

Maddog6961 · Post by **Maddog6961** » Sun Jul 15, 2007 1:57 pm

After messing a little further with the settings, it seems boost control is not working at all for me. I swapped my circuit over to use JS0 for IAC A. I did not drive the car around further to see if I was having issues with my PWs. I did however just try to get the GM valve to close and was unable. I was running in open loop mode, i changed my duty cycle tables appropriately and had no luck at getting the valve to close. Does anyone here have any ideas?

Does anyone have boost control running on MS2 extra yet?

Maddog6961 · Post by **Maddog6961** » Wed Jul 18, 2007 11:31 am

Does anyone have any ideas on this?

George

Post by **muythaibxr** » Wed Jul 18, 2007 11:56 am

I'll check the behavior using the output you chose... Try setting it to IAC1 and seeing if it does anything as well.

There isn't anything in the boost control code which would cause you to go richer with it on, so going richer was likely just a result of something else not working.

Ken

Maddog6961 · Post by **Maddog6961** » Wed Jul 18, 2007 12:02 pm

Well i believe that whatever is causing the engine to go richer is either an effect of the way I installed the hardware, or something with the code, because as soon as I turned boost control off, the engine behaved normally again.

I'll play with it some more and report back my results.

Post by **muythaibxr** » Sun Jul 22, 2007 10:28 am

The engine went richer because accel enrichment was triggering the whole time you were on the throttle when boost control was on.

It does appear that there is a bug in boost control causing this in the rtc section.

However, the duty cycle on IAC1 is correct so the solenoid not working was due to something other than a code problem.

I would guess you might want to invert the solenoid output and try again.

Ken

Post by **muythaibxr** » Sun Jul 22, 2007 11:33 am

Alright, I found and fixed the running rich problem... and tested all the selectable outputs, which all worked, so your problem with the solenoid not working is most likely the way you've wired it.

Ken

Maddog6961 · Post by **Maddog6961** » Sun Jul 22, 2007 11:49 am

Is this fixed in a beta release?

Post by **muythaibxr** » Sun Jul 22, 2007 1:49 pm

I fixed the only problem I found today, so it's not released yet. I'll be releasing it later today.

Ken

kurtw85 · Post by **kurtw85** » Thu Aug 02, 2007 9:51 pm

update on this?

Post by **muythaibxr** » Fri Aug 03, 2007 7:28 am

The fix was in the last beta I believe.

Ken