mikegrays00

Hello im new to the forums and the lsx engines and I have a major issue.

I have a 05 gto its a built 408 stroker eagle crank rods weisco pistons

it has a
comp cam 227/227/613/613 1150lsa
comp dual valve springs 660
comp push rods 7638 magnums
ls7 lifters
ls3 heads
pro comp sheet metal intake mainfold
areomotive fuel rails
85lb injectors
two 255 lph fuel pumps
comp triple ball bearing ct4380 turbo
turbo smart 50mm wastegate
turbo smart boost tee

on the dyno it boost up to about 6 psi and gets up to about 5400 rpm and completely drops off like its hitting a wall.

There are no rev limiters set that low or fuel cuts its very confusing
it just drops the power completely.
All spark plugs are good using tr6 gapped at .25
no boost leaks
any suggestions would help

itsslow98

iTrader: (18)

Sounds like its blowing the spark out to me. With your setup I would definetly be running NGK BR7Ef anyways.

Twin turbo c5

What kinda down pipe do you have and what muffler are you running. I had one do the same with a restricted downpipe.

Old Geezer

iTrader: (3)

What do the data log[s] look like when this happens??

Wasn't there another recent thread about this same problem?? AIRC, I read it. The rpm was in the same 5000 rev area, when it went south...