I have an S300v3 with BBG, 4 port solenoid. configured using gear based duty cycle.

Duty cycle is 60% in 3rd and 4th gear, and on the street that was making about 16psi. First pass at the track the car was making 18psi causing the car to hit its boost cut. The one difference between street and track is that the ambient air temp was about 15-18* cooler... but that doesn't explain the variance while at the track (see below)

I turned the duty cycle down to keep it from hitting boost cut, and eventually worked my way back to the original 60%... problem is the car wasn't getting back to that original boost level. I kept making duty adjustments from 50-60% as I worked back up and it wasn't making the changes I would expect...

Any advice on what would cause the car to make different boost levels with same duty %? I haven't done any boost leak checks yet, as the car seems to make good boost and close to original levels.

Any advice greatly appreciated.

I have logs I can send to those that are interested.

Thanks!
Chris

 

If the air temp is cooler, you will make more boost at the same duty cycle.
Refer to the air temperature compensation table to try and fine tune the compensation based on air temp etc.

 

I wish Hondata offered closed loop boost control.

 

That would be nice.