BOV doesn't seem to work? - Ford Mustang Forums : Corral.net Mustang Forum
 
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post #1 of 21 Old 06-09-2009, 12:02 AM Thread Starter
 
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Arrow BOV doesn't seem to work?

I haven't had the car tuned yet, but I pull 7in of vacuum MAX at idle.. The idle is irradic now (because untuned) so the cam lope brings vac down to around 4. Even so, should the car be able to blow off at idle under a rev, because it does not.

Also, even under load it won't.. I gave it just enough gas to spool a little, let off, and just hear a little surge.. no release from the BOV.

I have the lines ran like so:

Side port of Wastegate to one side of vacuum T
BOV to other side of vacuum T
Last nipple on T goes to port on very back of intake

Does this seem correct?

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post #2 of 21 Old 06-09-2009, 11:56 AM
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Sounds like you need to cut the spring in your bov down to ease up the spring rate

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post #3 of 21 Old 06-09-2009, 12:57 PM
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the spring is to hard for the vacumm the engine is making...

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post #4 of 21 Old 06-09-2009, 02:22 PM Thread Starter
 
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I just feel like I've cut too much down already. I can push the bottom of the valve in by hand without vacuum applied.. It does take a little effort but still doable as where when the spring was uncut I couldn't at all.
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post #5 of 21 Old 06-09-2009, 03:19 PM
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sounds like you have a vacuum leak, the bov wont open if you do not get enough vacuum on decel. Fix your vacuum leak and your BOV should work.

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post #6 of 21 Old 06-09-2009, 06:13 PM
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wastegate is supposed to see pressure before the TB IE fromt he compressor housing

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post #7 of 21 Old 06-09-2009, 06:39 PM Thread Starter
 
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Quote:
Originally Posted by Rich Gill View Post
wastegate is supposed to see pressure before the TB IE fromt he compressor housing
Thats what they say, but I've heard from others that they have used a vacuum source and it has been completely fine as well..

I'll search for a vacuum leak.. whats the easiest way to check for this on our cars?
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post #8 of 21 Old 06-09-2009, 10:24 PM
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Quote:
Originally Posted by Rich Gill View Post
wastegate is supposed to see pressure before the TB IE fromt he compressor housing
it can be conected before or after throttle body, depends if you want a little more boost.. (not talking about 1psi or more) or if you want your wastegate to be responsive, i have it before the throttle body...

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post #9 of 21 Old 06-10-2009, 11:25 AM Thread Starter
 
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Oh and it pulls almost 20 vac on decel, just at idle it sucks. Could it just be because the car is un-tuned and running on an N/A MAF in blow through config? If so I'm sure my tuner can take care of it as he has said it will be no problem.. (C&L housing)
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post #10 of 21 Old 06-10-2009, 12:29 PM
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+1 for a vacuum leak. Do NOT cut any more off of the spring until you get it idling with the correct amount of vacuum. Once you do, then you can go back and determine the proper pressure required to keep the BOV seated at idle.


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post #11 of 21 Old 08-07-2009, 12:05 PM
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My car makes just 10 at idle... has a high lift cam in it and its not tune... will tuning net me more vacuum?
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post #12 of 21 Old 08-07-2009, 12:51 PM
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you should see around 18-20 inches at idle, track down the leak before doing anything. Make sure the wastegate is run off the turbo so it always has an accurate reading, bc if its hooked to all the other vac stuff and there is a leak the wastgate will get a faulty reading and overboost and hurt the motor.
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post #13 of 21 Old 08-07-2009, 01:02 PM
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I do not see that much vacuum either.

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post #14 of 21 Old 08-07-2009, 01:06 PM
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I just went thru this problem - let me find the thread - ended up being a broken valvespring on my car.

I was making around 4" of vacuum and the BOV wouldn't work - take it off and hook it up to a hand pump and with 18" of vacuum it opened very easy.

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post #15 of 21 Old 08-07-2009, 03:45 PM
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I have a high lift cam with alot of duration.. pretty sure its the problem
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post #16 of 21 Old 08-08-2009, 03:03 PM
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I havent had 18-20 inches of vac since i ran a bone stock motor in my 82... My turbo car only gets about 11 at idle with a goofy E cam, hell my 357w only got 4.5" with the big duration stick that was in it. Don't use such a blanket statement sending him on a wild goose chase. Maybe he does have a vac leak, but he could be there for 20 god damn years trying to make 20" of vaccum.
We couldnt get the BOV to work origionally on mine when i put one one, i was using some ching chang meow rubber hose, turns out it was collapsing on the transition from boost to vac. Just more things to check out.
Brian

Quote:
Originally Posted by ferfont1 View Post
you should see around 18-20 inches at idle, track down the leak before doing anything. Make sure the wastegate is run off the turbo so it always has an accurate reading, bc if its hooked to all the other vac stuff and there is a leak the wastgate will get a faulty reading and overboost and hurt the motor.

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Last edited by PurpleGT; 08-08-2009 at 03:05 PM.
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post #17 of 21 Old 08-08-2009, 06:51 PM
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Doesn't cutting a spring increase the spring rate guys?
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post #18 of 21 Old 08-08-2009, 10:41 PM
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oops
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post #19 of 21 Old 08-09-2009, 06:22 PM
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Quote:
Originally Posted by PurpleGT View Post
I havent had 18-20 inches of vac since i ran a bone stock motor in my 82... My turbo car only gets about 11 at idle with a goofy E cam, hell my 357w only got 4.5" with the big duration stick that was in it. Don't use such a blanket statement sending him on a wild goose chase. Maybe he does have a vac leak, but he could be there for 20 god damn years trying to make 20" of vaccum.
We couldnt get the BOV to work origionally on mine when i put one one, i was using some ching chang meow rubber hose, turns out it was collapsing on the transition from boost to vac. Just more things to check out.
Brian
I thought this was true..increase duration with higher lift = less vac
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post #20 of 21 Old 08-11-2009, 03:12 AM
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Did you ever fix it ?

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post #21 of 21 Old 08-11-2009, 10:39 AM
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dont know until the car is 100% tune and on the road.
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