Fitted A Forge Dump Valve Today

[snuffy]

Whooooosh - Pshhhhhhh

[LJM]

How do you find it, I managed to get a faulks forge one cheap but don't know weather to fit it or not! And once you cut the pipework theres no easy way back! Help me make up my mind!!

[mgbond]

Just think of the extended life you will get on the Turbos.

Bondy

[ThatPhilBrettGuy]

mgbond said:

Just think of the extended life you will get on the Turbos.

Bondy

And quicker gear changes. No brainer really.

[snuffy]

Yep, get it fitted. It's a doddle. It only takes 15 minutes or so.

[Ash M400]

Do it, saves the Turbos and quicker gear changes.

It will also stop the pipes blowing off/up. Mine did and went with a bang.

No cost as it went on a Noble owners day.

[LJM]

Right thats it, As soon as the diif is done it will be going on. I managed to pick it up for just 50 quid, with the fitting instructions so should be a doddle to fit.

My main concern was the sound I was worried people may think there's a Chav in an Rs turbo heading towards them

[mgbond]

Lloyd,

I can't hear mine, all I hear is the air intakes Psssshhhhting in my ears.

I have however just brought the yellow spring and upgraded air filter for the BOV Forge threw in the filter free.

People say it works better. I'll see when I get the car back.

Bondy

[LJM]

Cheers Bondy,

I was just worried about fitting it and then finding the sound annoying. I had one on my type R, but I could just bolt the re-circ one back on if I got sick of it, Not an option on the noble.

Why have you changed the spring? Mine currently has the standard one fitted, Green I think.

If it reduces the lag between gear changes I'll be happy, I've only driven the car 2K miles and already I want it faster, It's a slippery and expensive slope from hear.

[joust]

LJM said:

Cheers Bondy,
I was just worried about fitting it and then finding the sound annoying. I had one on my type R, but I could just bolt the re-circ one back on if I got sick of it, Not an option on the noble.
Why have you changed the spring? Mine currently has the standard one fitted, Green I think.
If it reduces the lag between gear changes I'll be happy, I've only driven the car 2K miles and already I want it faster, It's a slippery and expensive slope from hear.

Tis easy to disable. Just pull the vacumm feed off the BOV, plug it with an M10 bolt or similar screw (cable tie the plug to make sure no leaks) and wrap around the breather pipe.

Mine is currently like that as the green spring gets lazy and it blows far too easily upsetting the ECU. I'm just been too busy to get the correct (yellow) spring from Forge.

J

[superdave]

It's not the green spring that's making your dump valve dump early, it's the fact you've dissabled it that's the problem. People think by plugging the vacuum pipe is a quick easy solution but it isn't. The dump valve under boost actually needs this pipe to be connected to keep it closed. When you boost, the pipe going to your dump valve has boost to keep it closed. It's only when you take your foot off the throttle you creat vacuum hence why it opens. The dump valves won't stay closed just on their spring force alone.
You can put stiffer springs in but you may not get the dump valve to work properly as the boost pressures simply aren't high enough from the T25's. If you had a T3 turbo then maybe or running 1 Bar plus.



Dave

[mgbond]

If it's not working proply how would I know.

When I first put it in I didn't notice any sound dif but gear change I think was improved.


If I put the yellow in what would I expect if it's not working.

Bondy

[joust]

Dave - read my post. I disabled it because it's dumping early due to weak spring.

Trevor Jasper of Roush who designed and tuned the Noble engine gave me instructions on how to disable it, as outlined above, so I think I know what I am doing....

It happily stays closed with the spring when there is no vacuum pipe connected - dump valves run off negative differential pressure, not positive.

J

[superdave]

Sorry, long day yesterday.
I have some spare new yellow springs in my office somewhere from Forge if you are interested?

Dave Walters

[joust]

No problem Dave! I have days like that....

Just rung Forge and they are very nicely sending me all the parts for free in the post - top guys!

So suprised I was I bought their nice Noble Oil Cap cover from them - looks yummie.

J

[plipton]

superdave said:

I have some spare new yellow springs in my office somewhere from Forge if you are interested?

I am if you have some spare - mine's hissing badly now, been getting worse for a while and is now losing up to 0.2 bar on full boost through the leak. How much for the upgraded spring etc?

Ta
Plipton

[plipton]

joust said:

Just rung Forge and they are very nicely sending me all the parts for free in the post - top guys!

Do you have their number, Joust? My Forge BOV has all but died

[mr noble]

I called them at lunchtime and they are sending me a yellow spring and new filter for free! How very kind of them!

[snuffy]

Mine's a bit odd. It hisses under hard acceleration, they goes quiet, then dumps when changing gear ( as you would expect ).

[plipton]

That's what mine's started doing - only it's got really bad since yesterday