WRX RCY

I've just fitted a FMIC with a Forge Dump Valve. When coming off boost some of the air is dump back through the turbo and making a chattering noise. Which I'm assuming isn't good for the turbo. So, what can I do to overcome this? Would a bigger dump valve solve the problem?

Thanks
Chris

charlesk

It does sound like compressor surge.
Try either a softer spring (you can get a full set from forge for (£10-15) or another BOV...

Jolly Green Monster

iTrader: (4)

What turbo?

Simon

kildare scooby

i.ve the same problem with a hks dump valve

hull sti

iTrader: (8)

ive the same problem with a hks ssq i think a lot of ppl get this wen fitting a fmic. any suggestions on how to overcome this ?

lunar tick

iTrader: (2)

I've experienced this as well. Fitting a softer spring will help dump more air and reduce this effect; however, it can also mean that the pickup becomes more laggy when planting the throttle in between gear changes (when the engine is revving hard and the turbo is fully spooled up). I have a Forge dump valve and am just about to experiment with some stiffer spring to try and reduce this effect

Jolly Green Monster

iTrader: (4)

If it is TD or Garrett turbo then enjoy the noise.. shouldn't cause a problem.

Simon

WRX RCY

It's a TD05, but the Dump Valve is fitted on the turbo side and not the inlet manifold side. Does this make a difference?