Bummer!

i ran a long runner manifold on my IWG8374 with 0 creep, it held boost solid at the 1bar spring pressure right through solid to redline, I bought the cast manifold and i am now unable to stop boost creep with the same boost controller , timing and AFR.

The only thing that has changed is the manifold. Can't work it out... not sure where to go from here...

How sucessfull is porting the turbo housing of an iwg 8374 to resolve creep? I don’t want to waste my time if this will still not resolve the issue