I was dynoing my setup the other day and about half way through the car stopped boosting. We went from 30 psi pulls to the last pull that would only muster 1.8 psi, lol. I checked for leaks, all the connectors and plumbing was perfect. The turbo manifold looked great and the turbo gasket and exhaust manifold gaskets were fine and everything was tight. I assumed the turbo died but when I checked it out it spins perfect and the wheels look perfect. It is a brand new turbo so I was surprised to think it was bad anyways. I am really at a loss right now and can not figure out why it stopped boosting. One of my buddies mentioned the dizzy for some reason but it starts and revs fine. So I am lost right now and any advice would be great.

 

wastegate/boost controller

 

I checked the gate and it wasn't open and was functioning correctly. After that we unhooked the controller and tried it on the gate spring with no fix. I may try taking the gate apart and checking the internals but it checked out fine that day.

 

thats odd.... The car didn't jump timing did it? Check your timing, meaning the cam gears....
That would be the only thing I can think of that would happen in the middle of a pull, beside something leaking.

Pull the gate apart and make sure all the alan keys that hold the cup onto the valve are good and inspect the diaphram for leaks...

 

try a different dizzy... cant hurt and ive heard of people having that problem before, altho i personally never have...

im betting on the dizzy or the software having some sort of oddball issue...

could also be cam timing, but doubtful...

stop taking shots in the dark and start checking stuff, swap dizzys, it takes 3 minutes, pull the gate apart and make sure everything is good and tight (altho we already checked it, it still cant hurt)...

it could easily be the turbo, but itd be nice to rule out the cheaper stuff hehe...