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Old 20-02-2006   #1
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bleed valve/adjustable boost control VS FSE Powerboost valve

Ok, so my new car has a bleed valve/adjustable boost control valve. Ive been told that they make the car run lean in higher revs and so could potentialy damage your engine.

Im not going to name names as i dont know whos right or wrong etc. but another guy on here thats owned the same car said to get rid of the adjustable bleed valv thing as they make the car run lean in higher revs and so could potentialy damage your engine.

He also said to replace it with an FSE powerboost valve and get it setup properly at a rolling road as then it wont run lean and should be fine etc.

is this a good idea? he also mentioned just removing it all together? im confused. im not all up on this turbo lark yet
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Old 20-02-2006   #2
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Re: bleed valve/adjustable boost control VS FSE Powerboost valve

right, i think that on your new car it does have to be tuned correctly as its old, you've kinda shot youself in the foot now aswell as people will need to know what car your talking about
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Old 20-02-2006   #3
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Re: bleed valve/adjustable boost control VS FSE Powerboost valve

Bleed valves are a hangover from the 80's school of tuning turbo cars, they are mostly responsible for many turbo cars from the 80's Uno turbo's, RS turbos, R5GTT's, MG Montego Turbo(when launched fastest saloon in world no less) form getting reps as unreliable, people stuck bleed valves on and then wonder why pistons melted, head gaskets blew and turbos exploded.

Remove it immediately, and get the car set up by a "professional", if you want more power do the conventional things that you do to a n/a car as a turbo car normally responds even better to things like head work, cams etc as they are even more reliant on good breathing as you are forcing air into the car.

I have no knowledge of the FSE valve but do know that an integrale has a rising rate fuel regulator as standard so if yours doesn't then it may be worthwhile, but check as it ma do already.

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Old 20-02-2006   #4
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Re: bleed valve/adjustable boost control VS FSE Powerboost valve

Many of my mates run tuned Jap cars and there isn't a FSE in sight with there engines.

I would say a remap or fuel controller is a better solution.

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Old 20-02-2006   #5
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Re: bleed valve/adjustable boost control VS FSE Powerboost valve

An FSE effectively gives you adjustable pressure fuel pump is my understanding.. which can stop the bleedvalve from leaning the car out...

Personally I would ditch the bleedvalve altogether though

Liam- Most *fast* Jap cars have these as standard i think..
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Old 20-02-2006   #6
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Re: bleed valve/adjustable boost control VS FSE Powerboost valve

right its going then. but will taking it straight out make it run crap or will the car readjust itself and run like it did before it was put on?

reason being that if I take it out and seal the hose and it runs rubbish then ive still gotta drive it to work etc. before I can get a proffesional to look at it.
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Old 20-02-2006   #7
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Re: bleed valve/adjustable boost control VS FSE Powerboost valve

Just get a new bit of hose and replace the bit the bleed valve is on.. you wont have any probs
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Old 20-02-2006   #8
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Re: bleed valve/adjustable boost control VS FSE Powerboost valve

was wondering about this today too, if i remove the bleed valve, how will the turbo be restricted in what its boosting to? ie will it just boost freely to like 1bar or something silly? (did this the time one of the bleed valve pipes came loose - so quick! but so about to blow up lol )
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Old 20-02-2006   #9
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Re: bleed valve/adjustable boost control VS FSE Powerboost valve

It will boost to whatever the wastegate actuater lets it from my understanding
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Old 20-02-2006   #10
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Re: bleed valve/adjustable boost control VS FSE Powerboost valve

i dont know much about turbos etc only the easy most ppl know bits So if i remove the bleed valve is it pot luck what car will then boost to? may boost to 0.3 bar or may boost to 1bar?
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Old 20-02-2006   #11
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Re: bleed valve/adjustable boost control VS FSE Powerboost valve

Your mate's talking balls.

You need an uprated fuel pump, not pressure regulator. If you whack up the boost and add an FSE you are asking for trouble. A 255 walbro fuel pump is needed if you are running higher boost. (Not sure if this would be the right one for your car tho) there's a group buy on at fccuk I think and they are about £80.
I'd get your car on the rollers to see if it's running lean anywhere in the rev range.
Also if you are going the mechanical boost controller route I'd recommend a PRV or pressure relief valve as opposed to a bleed valve, the boost instantaneous as opposed to the slight lag from the bleed valve.
I'm running an ARMVAL PRV and it's good kit, just until I can get that Apexi AVC-R jobbie
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Old 20-02-2006   #12
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Re: bleed valve/adjustable boost control VS FSE Powerboost valve

Quote Originally Posted by GhostWKD
i dont know much about turbos etc only the easy most ppl know bits So if i remove the bleed valve is it pot luck what car will then boost to? may boost to 0.3 bar or may boost to 1bar?
Removing the bleed valve will either cause you to run base boost (whichever your actuator is set at) or what happened when one of the hoses came loose on my coop, is there was no boost limit, and I saw 2 bar of boost before I realised something was amiss.
It was fun, if totally dangerous
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Old 20-02-2006   #13
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Re: bleed valve/adjustable boost control VS FSE Powerboost valve

Quote Originally Posted by GhostWKD
i dont know much about turbos etc only the easy most ppl know bits So if i remove the bleed valve is it pot luck what car will then boost to? may boost to 0.3 bar or may boost to 1bar?
With any turbo car it depends entirely on how the bleed valve is set up and to what extent it bleeds off the signal to the actuator as to what the effect will be when you remove it. It's a 'how long is a piece of string' thing, m'afraid. You need a boost gauge before you play with one.

They work by reducing the pressure the turbo wastegate actuator sees, so the actuator doesn't open as early, so the boost pressure will run higher.
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Old 20-02-2006   #14
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Re: bleed valve/adjustable boost control VS FSE Powerboost valve

Of course I forgot to say if you haven't got a boost gauge get one before anything else, they are vital for turbo cars. I can't beleive the coupe didn't have one as standard! The focus ST has one The uno turbo does to doesn't it?
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Old 20-02-2006   #15
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Re: bleed valve/adjustable boost control VS FSE Powerboost valve

Cant quite get my head around this bleed valve stuff so you'll have to bear with me

So if a bleed valve is the crude way to manage boost what would be the effective/proper way to manage the boost? as from what i can understand it will otherwise just boost to x amount (x being determined by the actuator) also, is the actuator adjustable or will it be a fixed variable?

Thanks all for your help hope its as useful to bushboy as it is to me

Edit: oh and dont worry i do have a boost gauge think the UT has one as std, mk2 one does anyway
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