007p Reverse or Normal Fitment

[wayne lcr]

ive tried it both ways and the noise is different thats about it.

 

[8bit]

I actually found that my car ran worse with it reversed. It was more hesitant and boost felt less severe...something to think about. I personally think having it reversed is illogical in terms of it's function. The piston in the DV should be pushing the presurrised boost air downwards into the TIP, in standard fitment this is exactly what it does when the vacuum drops the piston. In reverse, the vacuum is pulling the piston open at a sideways angle, allowing the presurrised air to escape through a smaller outlet into the TIP and then when the vacuum drops the piston, it's shoving it back through into the charge pipe.

I'm no expert but that's not my understanding - the vacuum pipe is the little one on the top, reversing the valve means swapping the two larger pipes around so the side one is in the TIP and the bottom one is in the bottom. Therefore the vacuum still acts on the piston in the same way. I thought that the vacuum (when applied to the top of the valve) worked to overcome the pressure of the spring, thus opening the path between the two large pipes and allowing the charge air back into the TIP.

If that's the case then it seems logical to me to explain the boost issues you had with your valve in reverse - in this orientation the boost is pushing up on the bottom of the piston, if your spring isn't strong enough to resist that pressure then the boost could potentially push the piston up far enough to allow some of the charge air back into the TIP.

Have I got that completely wrong?

 

[tyrer]

I love learning something new, turbo engines are new to me.

From this I think that I will just fit it one way then the other see what the noise difference is and decide. I am leaning towards the standard way just in relation to the spring that 8bit has just explained as it does make sense... as long as its right mate haha

 

[Pyro]

I'm no expert but that's not my understanding - the vacuum pipe is the little one on the top, reversing the valve means swapping the two larger pipes around so the side one is in the TIP and the bottom one is in the bottom. Therefore the vacuum still acts on the piston in the same way. I thought that the vacuum (when applied to the top of the valve) worked to overcome the pressure of the spring, thus opening the path between the two large pipes and allowing the charge air back into the TIP.

If that's the case then it seems logical to me to explain the boost issues you had with your valve in reverse - in this orientation the boost is pushing up on the bottom of the piston, if your spring isn't strong enough to resist that pressure then the boost could potentially push the piston up far enough to allow some of the charge air back into the TIP.

Have I got that completely wrong?

No your correct.... I think

 

[Steely]

I'm no expert but that's not my understanding - the vacuum pipe is the little one on the top, reversing the valve means swapping the two larger pipes around so the side one is in the TIP and the bottom one is in the bottom. Therefore the vacuum still acts on the piston in the same way. I thought that the vacuum (when applied to the top of the valve) worked to overcome the pressure of the spring, thus opening the path between the two large pipes and allowing the charge air back into the TIP.

If that's the case then it seems logical to me to explain the boost issues you had with your valve in reverse - in this orientation the boost is pushing up on the bottom of the piston, if your spring isn't strong enough to resist that pressure then the boost could potentially push the piston up far enough to allow some of the charge air back into the TIP.

Have I got that completely wrong?

yeah thats bang on, im running a mapped lc with yellow spring in reverse, i find the cycle time quicker ie, the dump is dropped quicker, and closed quicker since the aid of the boost on the piston makes it easier for the vac to lift the piston,

99% of turbo diverter valves on all other cars, run in what us 1.8t owners call reversed, with the boost acting on the base of the piston, i think even on a diaphragm type valve having boost act on the perimeter of the rubber diaphragm does'nt seem logical to me, plus with the forge 007 fitted the right way round the boost pressure is acting on the o-rings as well as the seal to the TIP, putting more stress on them,

ive possibly put too much thought into this , but hey im a pneumatics engineer whos usually working with 150psi +,

 

[tyrer]

yeah thats bang on, im running a mapped lc with yellow spring in reverse, i find the cycle time quicker ie, the dump is dropped quicker, and closed quicker since the aid of the boost on the piston makes it easier for the vac to lift the piston,

99% of turbo diverter valves on all other cars, run in what us 1.8t owners call reversed, with the boost acting on the base of the piston, i think even on a diaphragm type valve having boost act on the perimeter of the rubber diaphragm does'nt seem logical to me, plus with the forge 007 fitted the right way round the boost pressure is acting on the o-rings as well as the seal to the TIP, putting more stress on them,

ive possibly put too much thought into this , but hey im a pneumatics engineer whos usually working with 150psi +,

so your saying reversed????

IM GETTING LOST

 

[Steely]

so your saying reversed????

IM GETTING LOST

yup thats what i be saying!

 

[jamiebennett81]

so your saying reversed????

IM GETTING LOST

Seriously, just put it on the normal way round. Tried and tested it works fine and then leave it at that

 

[traumapat]

hmmmm Forge have said it makes no difference...
However the faster operating valve isnt always a good thing. The quicker and more abrupt the operation, the more of a pressure shock on the turbo. Better if the valve is progressive allowing better equalisation rather than the slamming door effect.

Bit extreme but its worth bearing this in mind.

 

[Steely]

Seriously, just put it on the normal way round. Tried and tested it works fine and then leave it at that

someones having a bad monday at work!

agree though, it works both ways, and the benefits are next to nothing, as long as it seals under boost its doing its job, people just have preferences i guess!

 

[wayne lcr]

just put the way you want to put it.

 

[jamiebennett81]

just put the way you want to put it.

Even better, happy days

 

[wayne lcr]

sorted

 

[DOLBY]

i have had mine both ways (when i had the BMC), and yeh, you will hear a distant chirp...im sure with my open cone now it will sound louder. At first it is irritating but i kinda warmed to it....but...and you will read some threads about it sometimes sticking when in reverse- and mine did a few times. Was booting it on a trip down to AmD a couple years back and under throttle made a long continuous chirp a couple of times. Then after the lower than expected torque and BHP figure on the rollers i decided to change it back.

At the moment the 007p in the normal position with an open cone makes a nice sound tbh

 

[Pyro]

i have had mine both ways (when i had the BMC), and yeh, you will hear a distant chirp...im sure with my open cone now it will sound louder. At first it is irritating but i kinda warmed to it....but...and you will read some threads about it sometimes sticking when in reverse- and mine did a few times. Was booting it on a trip down to AmD a couple years back and under throttle made a long continuous chirp a couple of times. Then after the lower than expected torque and BHP figure on the rollers i decided to change it back.

At the moment the 007p in the normal position with an open cone makes a nice sound tbh

Thinhat might need a service fella lol

 

[DOLBY]

lol the dv was 6 months old when that happened

 

[Pyro]

lol the dv was 6 months old when that happened

Hmmmmm it really shouldn't do that no matter what way round it is I'd be sending that back

 

[Pyro]

yeah thats bang on, im running a mapped lc with yellow spring in reverse, i find the cycle time quicker ie, the dump is dropped quicker, and closed quicker since the aid of the boost on the piston makes it easier for the vac to lift the piston,

99% of turbo diverter valves on all other cars, run in what us 1.8t owners call reversed, with the boost acting on the base of the piston, i think even on a diaphragm type valve having boost act on the perimeter of the rubber diaphragm does'nt seem logical to me, plus with the forge 007 fitted the right way round the boost pressure is acting on the o-rings as well as the seal to the TIP, putting more stress on them,

ive possibly put too much thought into this , but hey im a pneumatics engineer whos usually working with 150psi +,

This I pretty much exactly what I red on the web don't suppose you've been posting your knowledge

 

[traumapat]

Had similar sticking issues after 7 months or so, put it down to heat. R1 cant stick

 

[8bit]

lol the dv was 6 months old when that happened

May not have been properly greased at the factory, you wouldn't be the first 007p owner I've read of already in my short time here so far that got one that wasn't 100% perfect. Did you already have a remap when you got that valve?