[soxfan143]

I think the drop in boost is due to the Vtec cam design. And there being too much overlap when the vtec cams engage. I really don't think the turbo is running out of breath that suddenly. This is merely a theory of mine based on a converation with a Skunk2 tech I had a while back while I was researching what power adder I should purchase. He told me this would happen with the GReddy kit or any turbo for that matter. He recommended that I get an exhaust cam gear and retard the exhaust cam a few degrees and it will hold boost significantly better in Vtec. But I'm not sure if he was just trying to sell me a cam gear or if he was just being honest...lol...But it does make sense. NA motors use an overlap where the intake valves and exhaust valves are open at the same time for a bit to inprove flow and use exhaust scavenging to help pull the intake charge during the exhaust stroke. And having forced induction will change the need for that. The boost pressure will drop due to the valves being open simultaniously causing the boost pressure to pass right through the open intake and exhaust valves. This is what causes the boost drop in Vtec. Not the turbo itself. That's what he told me anyway. I wish I still had the email he sent me but I deleted it a while back.