Quote Originally Posted by Grintch View Post
It's called engine managment, all modern engines chnage a number of variables over their operating range. As long as you stay with the same map there shouldn't be an issue. The only downside is that if you are limiting high RPM boost this way is that you probably could have used a smaller, more responsive turbo than what you have.
If we're talking about racing, NASA TT rule 9.1 states that adjustments may not be made on race day. Not with a different map or with a manual boost controller.
I agree with you, in that, dialing down boost seems counter-intuitive except for octane or heat issues. If paired correctly you wouldn't do that... only try to go up! I remember having my engine tuned for my STi track car for a HPDE event at New Hampshire and somehow I was getting some boost creep. What started out at 400 WHP at 24 PSI spiked to 26+. I was like "give me more boost Scotty, this baby is screaming!" I had no interest in selecting my conservative map.