There is a DEFINITE fuel cut at 10 PSI.
I could not go any higher without the car jerking passed this point.
As Joe said in the past and I confirmed it that: 1st gear is just spinning of the tires, 2nd gear gives a very good 2 second spin of the tires and 3rd gear really gives you a pull. 4th and 5th gear seem to give about the same feeling as 5 PSI.
I am from CANADA amd I was reaching 110 KM in the picture of my boost gauge showing 9.5 PSI
This is just what the car needed, was an increase to the boost level.
I had to make SEVERAL passes to get the MBC set properly.
The method that JOEMBC says to blow into the controller did not work for me.
I would say to turn it out 3/4 of the way, then turn it 1/2 a revolution until you get close to 9 PSI then in smaller increments until you are satisfied.
This is a sure RECOMMENDED product!
Thanks Joe.