HI i have been lookin at loads of threads about this but i thought id post anyway.

I have a my99 uk turbo and it has a decat pipe a induction kit and a bleed valve fitted, now i have looked at the bleed valve and it i as near as dam it screwed all the way in yet the car still appears to be boosting over 20 psi according to my guage!! also i cant plant my foot as the boost cut comes in pretty much straight away!! any ideas people as im lost

also the car is still only doin around 18 miles to a tenner

 

Has it just developed the boost problem all of a sudden?

 

Reason you're getting 18miles to a tenner is a combo of 20psi/your right foot, no doubt! You should get around 45miles to £10 at current SUL prices of 111.9p/litre, on the combined cycle.

As a control, temporarily remove the BV form the system and reconnect the BCS to make sure the OEM system is functioning as it should and at the quoted boost target, first! Then if all okay, it must be something with the valve/plumbing, etc...

...Double check your bleed valve is plumbed in properly and whether it is actually closed right up. Other than that check for disconnected/loose/split boost control pipework. Is your WG actuator rod stiff? Can you slacken it off a bit to compensate, etc, etc...

 

hi unfortunatly not its been like it since i brought it two weeks ago but its gettin me down now

 

funked 02 sensor can cause the mpg to go mental have ya got standered td04? if so should be getting at least 25 if go steady. i get 18 but running 330ish

 

like the man says above ! me personally would remove the bleed valve. There is no need for one unless you have some serious mods imo

 

im not sure if it has a o2 sensor tbh and i think the turbo is standard td04

 

I would honestly bin the bleed valve mate i think there bad news, iv destroyed a few engines in my younger days with them, 2 rs turbos a fiat uno turbo and a renny5 to be precise, have you tried completly removing it to see if your over boosting.

 

hi the previous keeper told me the bcs was busted as it kept boosting up then loosing boost then boosting up again and tbh i aint sure if the bv is fitted correctly

 

If the bleed valve is screwed all the way in, it gives max boost try unscrewing it and see if your boost goes down...

 

hi i have allways been told that if its screwed in that lowers the boost im seriously confused now

 

if i remove the bleed valve where do the pipes go ??

 

bleed valves are a no no, boost control valve if you must fit one. Unscrew it as this lowers boost.

 

A bleed valve (but NOT a MBC like a Dawes Device) if screwed out, bleeds air out of a 3rd port thus the WG will, effectively, see more boost to overcome its spring's tension, hence greater boost getting into the engine. If screwed right in to its 'stop', then that 3rd bleed port is closed right off, so the WG sees normal OEM WG-set boost.

But get rid of it - a replacement OEM 2-port BCS can be had on eBay or a member on here for around, I think, £20 max.

 

my99 have 2 port if fitting 3 port will he not need a remap

 

lol yeah I realised at the last min he had a MY99 - see my amended post.

But as you say he could get the early, finer-controlled 3-port job (instead of the OEM 2-port), and get a remap....... if he wants to go to that extra trouble, that is...

 

depends on the type some are in some are out
this type is in Manual Boost Controller Audi S3 S4 RS4 RS6 1.8 Turbo TD on eBay (end time 20-Feb-10 10:07:32 GMT)

this one out http://www.fuelsystem.co.uk/Bleed%20Valve%20copy.jpg

 

the top 1 is a boost controller the bottom is a bleed valve, thought the bleed valve would work the same as bc hence my post saying out is less boost

 

Turbo Bleed Valve (Under Bonnet) on eBay (end time 09-Mar-10 16:09:59 GMT)

this is identical to mine

 

Try cleaning out the bcs, im sure there is a thread on here explaining how to do it, it may be all it needs, then bin the bleed valve mate, extra boost without a remap to ensure correct fueling etc is a recipie for disaster.

 

It's the bleed valve thats what they do, there crap as said if you must have 1 fit a bc not bv

 

Best thing to do would be to as stated above get the standard setup working. If you cant do this run a pipe from the turbo to the actuator this will give you about 0.7bar and will check that your actuator still works.
Doing this you know your engine will not pop but will be underpowered.

 

He was saying his bcs was not working correctly, was just saying to try giving it a clean, i no what a bleed valve does lol.

 

OP said the previous owner said the BCS was "busted".

Therefore, I'd be inclined to simply buy an OEM 2-port replacement and junk the bleed valve i.e. getting it all back to std and, very importantly, back to std boost levels!

 

cheers guys lookis like its in the bin with the bleed valve