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Brake booster and vacume lines? 

 

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 Post subject: Brake booster and vacume lines?
Posted: Fri Jan 25, 2008 1:05 pm 
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Hi, im turboing my E-series and have an idea about what im going to do about the vacume for the brake booster and heater controlls but i was wondering how you other guys go about it? cheers.

 

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Posted: Fri Jan 25, 2008 2:00 pm 
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I think ive read that why are brakes needed when your on boost.

 

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Posted: Fri Jan 25, 2008 2:58 pm 
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Yeah fair enough, but you need constant vacume for the heater controls so why not hook up the brake booster to that also? would help for burnouts under boost too!

 

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Posted: Fri Jan 25, 2008 4:46 pm 
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im boosting my car at the moment, does something have to be done about the heater controls, or is it fine just leaving it. I think i also read that theres a valve in there that only allows vaccum and no boost.

 

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Posted: Fri Jan 25, 2008 8:20 pm 
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just leave it all standard.

 

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Posted: Fri Jan 25, 2008 8:24 pm 
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yeah didn't changr any of it
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Posted: Fri Jan 25, 2008 10:47 pm 
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I've wondered the same thing while fitting 14.3psi into my XR8 too, but I think they get the required vaccuum by air velocity past the hose fitting?
Is this correct cos I'm not quite ready for the road, but dont want any drama's on test day!
cheers kenny

 

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Posted: Fri Jan 25, 2008 11:55 pm 
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pressure is pressure, your not going to have velocity going past a fitting.

brake boosters and heater controls have 1 way valves from standard.

u wont have a problem, just leave it as is, its been done 1000's of times.

 

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Posted: Sat Jan 26, 2008 12:47 am 
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f**k sake!

how much time do u think u will be spending f**k around with the heater controls while on boost?

and the brakes will work exactly the same at full throttle as they did b4 at full throttle, remember an na should have no vac at wot

its the biggest non issue ever when it comes to turboing an e series
why does everyone get so hung up on it?
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Posted: Sat Jan 26, 2008 5:36 pm 
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cos its the times when not on full throttle when you need the brakes!

 

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Posted: Mon Jan 28, 2008 5:11 pm 
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When you get off the throttle the butterfly closes and voila! vacuum in the manifold just when you need it for the brakes. Clever eh? Actually a bit more than that, the booster stores enough vacuum for a few brake applications and has a 1-way valve so it never gets pressure, it just gets sucked every time you close the throttle.

The vent controls have a vacuum tank and a 1-way valve as well, so the tank never gets pressure and also stores some vacuum.

So as others have said it's fine to leave it stock. I guess you know you'll have to change the PCV line though?

 

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Posted: Tue Jan 29, 2008 8:05 am 
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Brake booster stores some vacum in it aswell, so if there's no vacum going to it then it's still usable once or twice.

 

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Posted: Tue Jan 29, 2008 11:41 am 
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sly wrote:
When you get off the throttle the butterfly closes and voila! vacuum in the manifold just when you need it for the brakes. Clever eh? Actually a bit more than that, the booster stores enough vacuum for a few brake applications and has a 1-way valve so it never gets pressure, it just gets sucked every time you close the throttle.

The vent controls have a vacuum tank and a 1-way valve as well, so the tank never gets pressure and also stores some vacuum.

So as others have said it's fine to leave it stock. I guess you know you'll have to change the PCV line though?


Whats the PCV line and whats needed to be done to it?

 

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Posted: Tue Jan 29, 2008 11:56 am 
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3.9from hell wrote:
its the biggest non issue ever when it comes to turboing an e series
why does everyone get so hung up on it?

Probably because ppl post replies saying only "leave it" without explaining how it works... :D

 

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Posted: Tue Jan 29, 2008 12:01 pm 
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el_xr6_luke wrote:
Whats the PCV line and whats needed to be done to it?

The tube that tees off from the intake before the throttle body. The intake end needs to be relocated to between the turbo/SC and air filter and the factory tee sealed off. Otherwise the PCV system will get pressure instead of vacuum.

 

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