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Dump valve query


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Hi guys and gals!!

I know that this may spark a bit of debate but as some you may know im doing the 4EFTE conversion with !Rush! (Alex). I need peoples opinions/advice on dump valves. I have been looking at the HKS SSQV one. Is this a good one?

Im not too fussed about the dump noise, although it would be nice, but im after the one that works the best, eg doesn't leak.

Thanks in advance

Bourkey

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I wouldn't overly worry about leakages unless your expecting to up the boost pressure as mine only runs 9-10 psi on high boost. Most people that run fmic look to get the blitz ss or hks ssqv. I only got the forve twin piston bov, because it sounds good and was quite cheap.

Hope this helps.

Joe.

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I will be going for more power/boost in the future and yes i will be running a FMIC as i have no vent in the bonnet being an N/A one. I also like the look of the HKS one.

I just don't want to have to get another one in the future because it can't handle the boost.

ps. Im pretty new to turbos so if im going wrong someone point me in the right direction.

Thanks

Bourkey

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Any dumpvalve will do the job. Bailey,Forge,HKS,Blitz,Sard etc the only real difference is the price and sound. Bailey=£50ish HKS=£200 give or take a tenner,new prices by the way.

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I've just beeen watching some vids on youtube and i like the squeaky discrete sound of the HKS SSQV so i might go for that one unless someone tells me it isn't that good.

Get a Blitz Supersound, loud as hell and mean looking. Can get them for £120ish from ebay. look for JPS trade i think it is.

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That video....is on the CT9, running stock boost. But running through a Blitz filter mounted in the front bumper.

I'd say HKS SSQV is best for quality, plus it's adjustable so you can get some stall at lower boost and only 'dump' at higher pressures (several DV allow this)...I'd say my favourite in the world though, if I had to have one is the SARD racing valve...like the R2D2 only not crap.

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could I interest you in some very cheap GReddy Type-RS Replicas? Only bought them as I needed something cheap, quick when I thought I was being ripped off of my Authentic GReddy Type-RS (I still think I am) - only looking for £35 delivered, could do if you're looking for something "in the meantime"?

The HKS SSQV's are reknowned for being great units with regards to boost sealing, as they utilise a Pull-type mechanism, which means the boost pressure will actually push the valve closed, so it cannot physically leak through. But they do sound like a canary stuck in a blender - they sound horrible. I currently am running sans BOV - sounds kinda cool, but it's far too loud, and people keep looking at me which I don't like, if they're going to look at it me it best be cause of my striking good looks *coughs*. Opted for the GReddy RS as it's one of the few that come with a Recirculating Fitting

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could I interest you in some very cheap GReddy Type-RS Replicas? Only bought them as I needed something cheap, quick when I thought I was being ripped off of my Authentic GReddy Type-RS (I still think I am) - only looking for £35 delivered, could do if you're looking for something "in the meantime"?

The HKS SSQV's are reknowned for being great units with regards to boost sealing, as they utilise a Pull-type mechanism, which means the boost pressure will actually push the valve closed, so it cannot physically leak through. But they do sound like a canary stuck in a blender - they sound horrible. I currently am running sans BOV - sounds kinda cool, but it's far too loud, and people keep looking at me which I don't like, if they're going to look at it me it best be cause of my striking good looks *coughs*. Opted for the GReddy RS as it's one of the few that come with a Recirculating Fitting

Don't forget you can also buy the recirc attachment for SSQV aswell...think it's about £20?

I personally love the look people give (especially those driving convertibles when you come up behind them) as the turbo stalls in a big way :) I'm such a tart...it's all about fun for me.

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Stall is when the pressure air travels backward through the turbo and slows the blades and can result in lag.

When using no BOV you'll get a chatter noise which is caused by the blades of the turbo 'chopping' the air as it passes through them. Some like it, others don't.

Theres mixed views on what damage it does to the turbo.

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I ordered a HKS ssqv couple of days ago and it is yet to arrive! What does the adjustment do? didnt even know it had it. and what is stall in reference to BOV's? Sorry if im being dumb!! :)

The adjuster (depends on the model of the SSQV, some have no adjuster bolt) is to compress the spring within the bov, this in turn means more or less pressure (depending on making it lose or tight) is needed to open the valve of the SSQV. Tighter will mean that unless on full or high boost the valve won't open, making it lose will have it dumping when very little pressure is detected.

A BOV releases the pressure coming back from the closed throttle plate on lift off that's in the system before it hits the turbo...a dump valve vents this pressure/air to the atmosphere creating the sound, in a recirc valve, it performs the same job but the pressure/air isn't dumped to atmosphere it is passed back into the intake system before the turbo. Some cars that run AFM, a system that measures the air taken within the system need a recirc as measured air is lost to atmosphere in the case of a BOV...causing the car to run rich etc etc.

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