STUMPED issue with turbo camaro :(

[iroctt]

Trying to get my 89 iroc twin turbo running right and strugling with it.
The Basics
Twin t3/4 turbos new
Big FMIC
HKS bov
Tial 38 wastegates
3" dp
stock 350L98 with a stealth ram intake
72# inj.
FAST WB ecu
Big fuel sytem etc etc etc
6 speed

Car worked great in the spring was very fast but blew up the stock shortblock with 15# boost because the actuators didn't work properly. So I get the Tial 38 external wastegates. I get a new 02 from FAST since the old one was ruined from the antifreeze. So the problem starts when I put the new stock engine in it this winter and when I fire it up after a couple times in and out of the shop maybe 20 minutes of run time timing it etc a piece of the header weld inside comes loose and the impeller stops spinning and car sounds like it has a horible exhaust leak. I think wtf. I pull the turbo to inspect and and see a large piece of metal stuck in the exhaust impeller. I wiggle the turbo and it falls out the bottom of the turbo. I pull the compresor of and the impeler on the intake side looks perfect. I wip it back on and its works fine no oil leaking seems fine. So I drive it for the first time with the new stock engine and the car feels like it has 120HP and is very slugish and slow. Is it possible the turbo is shot? Could the turbo be acting as a huge restriction now and the other turbo is boosting fine to 5 pounds but making no power? Tial wastegates are set at 5 pounds and working perfect. The compresor side is perfect but i didn't pull the exhaust housing of the turbo I just looked at the exhaust wheel it looked fine. I checked the obvious intake leaks loose hose clamp etc. The turbo still does not leake oil at all and spins fine when idling. I just have the FAST demo running the car it should run ok with it and it idles pretty good. I'am getting ready to send the turbo out to be looked at. The car seriouly only makes about 120hp and won't even spin the tires in the rain. I have the wastegates set at 5# to be safe and when you rev it in 1st gear it goes up to 5# on the gauge and stops like it should but car is a pig my lumina would beat it.

I just thought if the turbo was shot it would leake oil or the impeller wheel would be damaged or locked up?

 

[FastRegalWE2]

not to sound like a tard here but, you have checked your ignition timing yes?
I dont know much about turbos yet, only had one for a month now. But let me give it a shot. If the turbo is spinning freely it should not be a "huge" restriction in the exhaust. The gasses could still pass as it spins. Something I had read was it is true that they are "somewhat" of a restriction but not where it makes them less desirable as they are the most efficient type af add on power maker.
ANyway, if both wheels are not damaged and it spins I do not know why it would not boost. Do you have some sort of boost controller in the car thats messed up? Didnt leave a rag in the intake or something like that? Cause it could always be something stupid as that ya know. May even be looking in th ewrong area all together.

 

[azgn]

if you had antifreeze on your wideband (ASSume it is in the downpipe) heaven only knows what went thru your turbo(s)

they are prolly shot

 

[iroctt]

car is fixed, distributor was of two teeth. We ran the car tonight briefly only shifting at 4k and getting 3 pounds of boost on the gauge. Tial wastegates have 5 pound springs. I think with the large FMIC and steath ram intake it loses a pound or so on a bone stock L98. Car ran good, hard to say but similar to a LT-1 car stock. Going to hook up the boost controller and turn it up a little. The new engine hopefully will be ready for spring.
Thanks for the help