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Bailey DV30 bov

appletonn

New member
Just wondering if any of you Turbo owners have fitted one in place of the original plastic Bosch one and what, if any, difference have you seen?

I have no reason to think that my standard Bosch one is faulty, but according to the Promax boys I should really fit one to make the most of the other enhancements I have already fitted - does it really improve low rev boost arrival and does it also help to maintain peak boost levels further up the rev range, more so than the standard one?

Cheers
 
The standard one has a plastic diaphragm and a definite shelf life before it starts to leak slightly. The aftermarket ones like Bailey and Turbo Dynamics are all metal with a more durable piston steup inside. They will stop leaks on a standard car and last longer on a tweaked one. I couldn't say if they will improve performance compared with new standard part as I don't think I have heard of anyone just changing a working valve.

You can be the first test mule Nick [;)]
 
ORIGINAL: Diver944

The standard one has a plastic diaphragm and a definite shelf life before it starts to leak slightly. The aftermarket ones like Bailey and Turbo Dynamics are all metal with a more durable piston steup inside. They will stop leaks on a standard car and last longer on a tweaked one. I couldn't say if they will improve performance compared with new standard part as I don't think I have heard of anyone just changing a working valve.

You can be the first test mule Nick [;)]

OK, here goes nothing....[:D]

Will let you know once I have fitted it and done some highly scientific testing [;)]
 
I'd have thought not one jot of difference, they are just underbonnet bling as far as I have ever understood. All the DV has to do is not leak when closed and open when the throttle closes; the only problem with the OE one is that the diaphragm fails and the 993 sourced superceding part (or cheaper but idetical Saab part) has a metal diaphragm that solves that problem nicely. I'd also venture that the Bailey's quality won't be better than Bosch (maybe not even as good) as I have read negative comments about their DVs and BOVs in the past.

Not the first time recently I've heard of a certain "specialist" making dubious/exaggerated claims of benefit to try to sell kit either if I'm honest.
 
Can the OP confirm that Promax have said that fitting a vent to atmosphere air pypass valve will improve the performance of a 300bhp car?
 
I had assumed it was a recirculating one that has been suggested, but that's an interesting point, Simon.

You still run AFM I take it, Nick?

edit: Googled DV30 and it is a recirculating type.
 
Ive had time to google it now, it does appear to be a re-circ. Personally, I wouldnt fit a Bailey anything.
 
For a 300bhp car, providing that the OEM part isnt leaking, then therell be no improvement at all.
 
Yes, it is a recirc one, but allegedly it will improve boost levels at either end of the rev range (ie come in earlier and hold peak boost for longer).

To be fair to any vendors mentioned, it was 12 months ago when I had the conversation and I beleive it was in the context of ' if the OE part was weakening' then there would be a noticeable improvement - much as there would be if I were to fit a new Bosch part then?

I was just curious whether those of us running raised boost levels would see any like for like improvement in boost delivery through such a change.

Evidently not![:D]
 
Nick, please stop splitting hair on such ludicrous items, drop your car by Jon M and have Simon P fit it one of his custom turbo and a Vitesse MAF. By then your car just might be in need of an upgraded recirculating valve.
 
I'd be interested to know how the improvement is supposed to be obtained. My response when statements like the one we are discussing are made to me is normally "how does that work, then?", not in an antagonistic way, but to see if I can learn something and/or if the person making the statement knows what they are talking about enough to make a convincing case to back up the idea.

You opened the thread saying "I have no reason to think that my standard Bosch one is faulty" so I imagine others, like me, were comparing the Bailey to a good OE one. If the advice was given on the basis that the OE ones are prone to failure of the diaphragm then that is a different thing. It's still disengenuous upsell however as the fix for a failed OE one is a new 993 type if you want the Porsche box, or a Saab one if you just want the part as cheap as possible.
 
There are only two possible gains, where: 1] the OEM part is worn and leaks 2] the OEM part cant contain the level of boost achieved.
 
ORIGINAL: TTM

Nick, please stop splitting hair on such ludicrous items, drop your car by Jon M and have Simon P fit it one of his custom turbo and a Vitesse MAF. By then your car just might be in need of an upgraded recirculating valve.

Why just that, might as well get a 3.2l monster like Pauls...???!!![;)][:D]

 
IIRC the diaphragm in my old DV27 (non recirculating DV30) was no more advanced than a silicony rubbery material.

A DV27 or 30 may have a different spring rate to standard of course.
 
I have a DV-30 in mine, one of the many trinkets applied by the enthusiastic but slightly misguided previous owner of my car. I've never used the standard Bosch part so I can't compare but I've no complaints about the quality of the one in mine. It has a nylon piston rather than a diaphagm so it's more robust by design, regardless of build quality.

I feel compelled to back up that last statement with some kind of evidence of my ability to judge so I'll just tag on that I spent two years at Coventry learning automotive & mechanical engineering (note: I'm not a great mechanic but I know what stuff should & shouldn't do).




Sod it I'm in the mood so I'll add another:

My Dad died on the 13th, I was in hospital with him, I had the 'big' chat with the docs & had them switch off the machine because there was no point postponing the inevitable (it's what he would have wanted). The funeral was on Tuesday (27th). Drove the family there in my Dad's car, carried the coffin in from the Hearse, stood tall & proud and did my duty in front of the family & friends out of respect for my Dad. Never really got on with him, our opinions differed in many areas but we each learned not to tread on the others toes & everyone around us had enough good grace not to rock the boat.
On Wednesday I planned to take my car down to Promax for a second opinion on some overheating issues, basically it was an excuse to get away from the family for a few hours for some blokey fun but on Tuesday night I came down with this bloody flu everyone seems to have at the moment, and come Wednesday morning rather than getting up at the crack of dawn to drive 90 miles to Promax I waited in & gave them a call at 8:30 (when I figured they'd be open) to let them know I wouldn't be able to make it & to un-book the courtesy car they'd booked for me.

Before I had the chance to cancel Andy asked when I'd be there because they had the Monaro waiting for me. Always had their silver Rover 600 before so I was expecting the same again but with the offer of a V8 muscle car suddenly I was feeling up to the trip & I was out the door by half past nine[;)]
Trip down there in my car was nice & relaxed with the rain keeping the salt off the windscreen & the engine cool, in my slightly dazed state I just stuck to 60 in the inside lane down the M1 & let the world pass by, I didn't have the energy to enjoy Porsches' "make every single car in the outside lane wobble slightly then indicate left when they see it coming" motorway party piece but I was there by 11am, had a chocolate milk & a friendly chat with Andy & Roger while they sorted out Tam's 924 and was still just about standing without assistance when Andy gave me the keys to the Monaro. I don't know what they've done to it from standard but it sounds absolutely fantastic and the power is just incredible from (literally) tickover all the way through the rev range.
Too tired to do anything with the power even though I really, really wanted to plus it was wet and everything, I just tickled the throttle & let it burble & gently cough on the overrun to the M1, then stuck the cruise on at 70 & more or less fell asleep in it's massive leather armchair of a driver's seat.
It's sat outside my house right now, because I'm stuck at home with man-flu & haven't got the energy to go & bounce the exhause noise off every wall I can find in Derbyshire.

One of my Dad's few regrets is that he never had a go (as a passenger or driver) in my turbo; he couldn't fit in the sport seats and neither he nor I were prepared to make a big enough deal of it to fit another seat. He'd have fitted into the Monaro though, and he'd have absolutely loved it. Ironically had he not died I probably wouldn't have booked the car in at Promax this week, it was just an excuse to get out of the house really. Andy & Roger didn't know any of the background to this, a simple chat & coffee was all I was looking for but what their Monaro's done is remind me of some good times with my Dad at a time when I really needed it.

See, when you're nice, people are nice back. When you're bitter you just get withdrawn & die an early death. Probably[8D]
 

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