I had my car re-tuned a couple of days ago and for some reason when it hits vtec, boost goes down to 5psi from the regular setting of 10psi. But the problem is that it only does it when its on the dyno. I could be driving all day long and boost stays steady at 10psi all the way to 9k. Why would it do it only on the dyno? Setup is b16 with type r cams and garrett t3 turbo.

 

thats crazy samething happened to me, also a b16T