4agte problems

[reecegze]

Hey guys ive recently converted my 4agze to 4agte its runs fine with the stock afm electrics but there is a problem with the bov when off acceleration. It does not vent to air or release any boost at all .. It is not a plumbback type and it seems its just making the turbo surge off accelleration.. What could be causing the bov not to do its job ? Ive tested numerous brand new bov's and still it will not open. If this matters i have it right next to the intake manifold on the engine.

Here are the pics of the setup

http://img401.imageshack.us/img401/5559/019rp1.jpg
http://img183.imageshack.us/img183/373/020vr4.jpg

[Duk]

Nothing wrong with the location. The only thing that spings to mind are insufficient vacuum signal from the manifold or the spring is to tight.

Can you double check to make sure the signal line is seeing full manifold vacuum when you let go of the throttle?

Can you loosen the BOV spring tension at all?

BOV's should be able to push themselves open without a closing pressure from the signal line. If you remove the signal line, can you hear the valve leaking?

[30psi 4agte]

Try plumbing it to a different location... From memory that vac port you have blocked off with the little piece of blue hose on the throttle body is after the throttle plate .......so try putting it there and see if it works.

The bov really should have its own vac source. I doubt that that pissy little vac tree can give it the vac it needs to open correctly

[30psi 4agte]

BOV's should be able to push themselves open without a closing pressure from the signal line. If you remove the signal line, can you hear the valve leaking?

Thats not really true... If that were the case the valve would be open under 0 vac...... How would the engine generate boost if it doesnt have a sealed system to start with

Unless you can get the car to boost at idle so you can see it. It would be hard to hear the valve leaking when you are in the car driving it to get it to boost also.

I see where you were going with it but others with little knowledge may not.

[cri_ag]

my bov is in the exact same spot as yours and from memory i think its connected to the same 3 way splitter yours is. i have no problems with it not going off. how much boost do you run? mine hardly makes any noise when i have the boost set low eg. 7psi

[reecegze]

I run 6 psi pn the stock actuator .. i will try to put it on the t/b or somewhere else.. i am sure its got nothing to do with the bov as i tested it with 3 other ones. Its just not receiving enuff vaccum i think but its got a vaccum tho ..Ill try putting it in a temporary location to see if it changes anything.

[The Real Roadrunner]

Thats not really true... If that were the case the valve would be open under 0 vac...... How would the engine generate boost if it doesnt have a sealed system to start with

Unless you can get the car to boost at idle so you can see it. It would be hard to hear the valve leaking when you are in the car driving it to get it to boost also.

I see where you were going with it but others with little knowledge may not.

he is actually correct,

the valve wont open at 0vac as the spring holds it shut and is generally rated to about 4psi or more.

if its a fullysikhetikwoosh vavle (which it looks like) then you will hear them leaking without a map signal on them, they whistle like a bastard (=annoying) and there will be a distinct lack of power also as it will run waaay rich.

reece12, probly better off plumbing it back as BOVs that dump to atmosphere can cause shity throttle response when you back off then jump on it again (but its up to you) and the cops wont ream you as hard on a plumb back.

cheers
linden

PS ive used the same signal source b4 so it should be fine, try removing the line off it when idling and see if it has vac or it could be blocked

[Cuzzo]

Did you get a weaker spring with it?

Have you tried adjusting the nipple on the top of the bov?

[reecegze]

Hey clearly not the bov as 3 different types dont work.. its my setup/vaccum source i am told... Ive tried to put it in the throttlebody ports with no luck teeing all the 3 port vaccum plug to give a better vaccum to bov but still no luck.. A mate of mine has a gt starlet and hes bov is straight after the turbo we tested my bov on hes and it blows off on idle and at 0- 2 postive pressure ..Something is really weird, I continue to drive the car with 6-7psi without bleeding the boost.. could this harm my turbo short term ?

[Duk]

Weird !!!

[reecegze]

yes it is i am very confuzion

[Beak]

Just an FYI,

Once it's working as intended:
As the vented air is not plumbed back before the turbo, the afm will be measuring airflow that's not entering the engine, and you'll find that it will run rich when the bov opens.
may cause issues

cheers,
Chris

Edit:
this is exactly what Roadrunner's talking about.

[fixeruperer]

does the line to the bov hold vacuum does the nipple leak ?

can you see the valve in the bov move when you rev it ?

pull the line to the bov off and suck a vacuum using that pretty mouth of yours, the valve wont open but it should if you rev it.

then you know you have vac probs wich you no already.

[reecegze]

it doesnt leak , the piston doesnt move with hard revving or standard driving but works when checking with force obviously. I pulled the vac line off the bov and its pulling a vaccum but still bov will not open, while driving or hard revving.

When i drive the car i can hear the turbo spooling up and as i come off the t/b i can hear it whinding down , but no venting is happening :S

[The Real Roadrunner]

try teeing it off the brake booster line, this should have the strongest vacuum of all the vac ports as it has the largest volume, failing that im a dear with no eyes.

cheers
linden