i cant get the mini to overboost for some reason im running 11 psi the mods right now catless 3 inch downpipe,3 alta exaust,alta intercooler and all the boost pipes,alta intake ????

 

You need to reprogram your chip. Otherwise stock boost is 11.6 psi or 0.8 bar including overboost.

 

how comesome see 15 psi overboost

 

07 versus other years and possibility calibration of the boost guage

 

^ ++1 exactly.

Calibration. You get what you pay for.

 

When I bought my 07 cooper I had no idea what the crack in the hood was. I still love the speed from the stock engine...and changing gears on the steering wheel...but next year I'm trading for the Convertible..with a crack in the hood...and how do you increase HP with a chip..?

 

Short answer... plug and play. (Correct me if I'm off here as I'm not an expert on this.) It's called a piggy back ECU. Basically it rides along plugged into the stock ECU and "widens" the performance parameters based on the mods that you've done to your car and "unlocks" some HP. On a stock car, it'll probably just increase the boost a wee bit.

 

To the OP: Have you done any datalogging? How do you know you aren't inducing overboost at all times?

FWIW: when I built my custom 3" turbo-back exhaust on my '07, I discovered it was much more difficult to induce overboost, due to the change in exhaust aerodynamics and pressure deltas. The MINI's ECU is very "HAL", and it knows when you change the hardware and reacts, usually negatively. Change all the hardware variables and you will leave the ECU in a different state and it will allow a different boost curve that may or may not be beneficial.