Hope someone can please help me out?
I've got an issue with my car that I've never been able to sort out - with cruise control surging especially going up or down hills. Flat road its not too bad.
I can't find the parameter I need to change.
It seems as though when its in cruise control as it slowly releases the throttle it goes in Spark Source mode "Closed throttle Decel" a bit too early (I think) and also the Throttle Angle Source is going into "Idle control mode"
When this happens it feels like the throttle has been fully shut and then a split second later it picks up and goes again.
Then it starts building boost; then it over shoots the target it then decels again. Looking at the speed though its ok within 1kmh.
After examining the logs I can't see any particular trend that causes this.
It's not related to a particular throttle position, map sensor value, engine load etc.
When it decels I noticed that the cam angles change a heap and there's a huge amount of cam error.
I have DFCO disabled.
I've changed so many things on this ecu I can't figure out whats wrong. I'm a bit lost. Maybe HPtuners doesn't have the parameter I need to change.
I would like to raise the reference point (whatever that is) at which it goes into closed decel spark source. Maybe if it stays in Base Spark source it won't do it.
I'd also like to be able to change the rate at which is opens the throttle to accelerate in cruise mode. I can't find any settings for the ETC relating specifically to cruise mode. I've tried changing the Feedback Control proportion under ETC menu but it doesn't make much difference. Its always too abrupt it needs to be smoother.
Heres a screenshot.
cruise.jpg
My car is a XH Ute with BF NA ecu [HACCKA2] with turbo logic enabled. Using OSS and I've changed rear tyre size but the speedo is ok within 1-2kms.
Any help would be appreciated.