Ive got this despite having it all plumbed in correctly and on the weakest spring, im thinking of fitting my vta forge just to see if something is amiss.

Any suggestions?

I did have a pipe welded on as silly autobahn forgot to fit a dv outlet on the redesigned classic fmic.

It sounds like this, still spools up fine.

YouTube - SR20DET Compressor Surge

Push come to shove i'll contact forge to see if they sell an even weaker spring, or failing that knock one up myself.