Standard recirc valve limit?

[drakesnow]

Hi all, might be a silly question but just an intriguing topic for me. Was speaking with scott about my standard recirc valve on my classic v4. I'm currently mapped mafless and running a front mount if that helps.


Is there an actual point where the standard recirc is no longer any good?
Is that dependent on boost or any other fators in your tune?
Is there a point where you need to run a vent to atmosphere setup or a "dv delete" and get rid of it all together?

I thought this could be for reasons of spring strength or maybe possible turbo damage, or overall efficiency of the system.

Curious what you all have to say.

[asperformance]

if its the plastic std v3/v4 tube style then they do have a boost limit and will start to be pushed open at higher levels (around 1.4/1.5BAR IME) if its in the std orientation......

a common "cheat' we used on the older grpN cars (and very similarly equipped EVO's) is to turn the valve around so its piped backwards and then we have run them at near 2BAR with no issue (the boost now pushes the valve closed)

[drakesnow]

Good info. Will this trick work with it being run in conjunction with my front mount/mafless? Or would getting rid of it all together be plausable?

[Tyler]

Ran mine at 1.5 bar at 351bhp with no issues.

[drakesnow]

Curious about higher than that though , and was concerned about compressor surge and what not

[Tyler]

Anything above the recirc will leak. So yes you are correct bud