Boost control help please

[gjls]

My boost control oscillates allot at part throttle and as much as I have searched I can't find how to tune it out any help would be very much appreciated.

MS3/MS3X 1.3.2

94 f150 4x4
302 with 60mm turbo

[Raymond_B]

Hey man

I wonder if it is in the PID settings, just like when you go PID for WB O2. For reference http://www.msextra.com/forums/viewtopic ... 34&t=55744

[gjls]

Raymond I dont believe that is the issue since in only happens about 1/2 throttle

[pit_celica]

Increase your Boost Control Lower Limit Delta. The problem is that when the boost is less than (your_target - boost_lower_limit_delta), the boost duty goes to maximum_duty (100% in your case). It can be seen at 270.936-271.003. Right at this time, MAP goes right under the threshold (155-15 = 140) and the boost duty goes to 100%. This yield to an overshoot and the boost then goes to 0 to fight the overshoot. You could aslo reduce P a little while making sure the full throttle is still working good.

Sam

[gjls]

Thanks sam i will give it a try

Jerry