Hey lovelies,

I have a question that I'm sure you can help me with. I currently have an aftermarket dump valve on my scooby and thinking if changing it back to a recirculating one. What are the pros and cons to this and is it worth doing. Here's a pic of what is on there now. Thank you for any help xx

 

I currently have a GFB blow off valve as it is fully adjustable so you can have the blow off sound but if you have had enough you can put it back to recirculating. Best of both worlds. 

Recirc pros: tends to run better unless mapped. Silent (if you like that kind of thing)

Vta pros and cons: makes noise but can cause running issues

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I have a GFB as above and run it mainly on recirc, but great to have turned on when you want a good drive. I did spend some time setting up the spring on it (see GFB videos) and haven't had a problem whether on recirc or VTA.

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Thank you for the help, I'm still undecided. I like the noise mine makes but have had some blank spots in the turbo and wondered if changing the dump valve back would fix it. I also don't know if it was remapped when it was changed over in the first place. Worried I may cause more problems changing it back. I'm having a do I or don't I moment. x

Get yourself a second hand genuine one, should be cheap as chips from a breaker and try it. I'm running Forge 50/50 recirc/atm but it has been mapped with it

Recirc has less lag. The car doesn't waste it all sending it to the atmosphere. You built up that boost. Keep hold of it. GFB are a good compromise.

i replaced my GFB back to the oem valve from a sti as coming from a hatchback that was quiet,the stupid noise from the dump valve was doing my head in,ok if your 20 but now am old i like a quiet life lol and the car seams to run better as well now.

I thought my car was broke until i changed the dump valve for the recirc valve so much lag was terrible. Recirc is better.

I knows its a topic debated a lot and often people say there is no difference in my experience though ive always found the recirc better, obviously you lose the noise.

Just as a small update, I've noticed the GFB valve is rubbing on the underside of the bonnet, and seen as a I don't run it much on VTA I've removed it and returned to standard recirc.

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Kept my oem dump valve on my 2003 wrx mapped at 280. I'm not bothered for the noise of a vta and I tend to think that if the genuine dv wasn't up to the job, subaru wouldn't have fitted it in the first place. Like has already been mentioned, I have heard that changing to vta valves can cause all sorts of running issues. Only my opinion though and there are lots of scooby owners that would argue a case for changing.

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After spending some time adjusting the spring correctly I didn't have any sign of a problem on a 2014 (new design) STi, with a slight improvement in gear change..... Say that.... :-)...... And this might just be me, it does seem a little smoother with the OEM back on ;-)

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I'm going back to the oem once I can be bothered to change it back lol. But I do like a bit of noise when changing gear but I don't really hear it with the nurspec exhurst on.