Originally Posted by criptballer

So no matter what I do I will always be tapering down that much? What would happen if I install a boost pill on the line going to the wastegate? Also, I set my mbc correct right? Thanks for all the input guys

Originally Posted by rogue

I do think that if you are using a MBC you should not be going so low into the boost range...

All your lines are hooked up correctly? (Yes, a dumb question, but I have made mistakes before)...

right Clark =)

Originally Posted by UT_EvoX

It's because you are at altitude and you haven't adjusted your boost/vacuum data logging item in EvoScan. I have mine calibrated to about -12.65 rather than -14.5. That will show the actual positive pressure up here (it will show higher once adjusted). Also, you'll never see as much boost up top at 4500 ft as you do at sea level. I saw 21 psi at redline at sea level, and only 19.5 up here. Be VERY wary of turning your boost up beyond 25 psi here, I've lost my turbo in the last 10k miles because I've been running 28+ psi at altitude. The pressure ratio becomes higher with the less dense base air given the same boost pressure (the compressor has to spin faster to achieve the same amount of boost). Anyway, if you need any help tuning, I can drop you some tips.