I've had a search and feel I may re-open a can of worms on this one

Forged 2.0 zetec turbo running a T3 turbo @ 20 - 22 psi

Do I need a dump valve?

I can't put up with the noise of the damn things but I don't want to damage anything!

Thanks.

 

is the t3 a standard unit? if it is i would use a dv. 22psi sounds a bit borderline on a std t3. if its uprated and can safely handle that sort of boost i wouldnt bother. i cant stand the sound of them either. i fitted a blank in place of the dv and it idles better, starts first time and i noticed no other difference. i prefer not running the dv.

 

Well I like DVs tastless spoilers an think lady GaGa would make a fine GF so prob best not to take anything I say as useful.

 

A 360 deg thrust bearing and different size wheels/housings will make no difference as to if you should run a DV mate.

But, IIRC the T series are ok to run without a DV but the newer GT and GTX series have a thinner shaft and are more likely to snap with compressor stall (chatter).
I ran my T3 without a DV (always have) at 30psi and had no problems for example.

 

iirc unless you are running a T4 or 30psi you don't need to. I've been running 25psi on my T3 with no problems. If you're worried why not fit a recirculating dv.

Mind you I did have a moment of childishness and fitted an HKS dv to my daily for shits and giggles

 

thats good to know. the noise reminds me of bad car films, spotty chavs in sportsgear with bad haircuts and sterling silver 25kg necklace/bracelets. i find them most pikey. having said that, i used to 'dig' them but as i approach thirty the fact that 15yr olds look around knowingly, and 30 year olds look around with a sneer makes me reavaluate what i dig. if they dump at full bost or therabouts then there ok. its when they dump at about 2psi they get on wick. how do you alter the boost at which they operate at? is it possible by altering the spring rate? assuming its a dv26 of course.

 

Running no dump valve on my Orion zetec turbo.

 

Thanks guys. Its just knowing I'm not going to do any damage with not having one on!

 

Ford fitted one... So I always use one either it be atmospheric or re-circ.

 

The way I see it is that the turbo will slow down quicker if it's trying to push boost against a closed throttle, also, the compressor is going to be subjected to undue stress. I have a pair of recirculating ones on my twin turbo, dumping the air straight back into the compressors. This should help keep them spinning and doesn't have the chav soundtrack either. Win all round.