Testing a blow off valve?

[Sy-1177]

So I had a blow off valve installed on my Typhoon that another forum member bought from me, and he says that it doesn't work for him. Is there a way to test these without actually mounting it on the truck? Maybe force some air into it somehow? Its already bolted to the up-pipe and he said he has the vaccume line going to the intake so it should be hooked up right. Not sure what the problem would be?

 

[Windedv6]

Re: Testing a blow off valve?

So I had a blow off valve installed on my Typhoon that another forum member bought from me, and he says that it doesn't work for him. Is there a way to test these without actually mounting it on the truck? Maybe force some air into it somehow? Its already bolted to the up-pipe and he said he has the vaccume line going to the intake so it should be hooked up right. Not sure what the problem would be?

What kind is it? So will open slightly under vac which is normal. Some ppl think something is wrong when they see this as it sounds like a leak. What happens is that under manifold vac the spring is at minimum tension and the turbo is actually building a little boost in the intake pipe because the TB plate is closed down. Normally if you hear a leak at idle it is actually air escaping the air intake not leaking in.

Some over tighten the spring when they experience this which only causes the blowoff to not work properly under full boost.

John

 

[Sy-1177]

Re: Testing a blow off valve?

What kind is it? So will open slightly under vac which is normal. Some ppl think something is wrong when they see this as it sounds like a leak. What happens is that under manifold vac the spring is at minimum tension and the turbo is actually building a little boost in the intake pipe because the TB plate is closed down. Normally if you hear a leak at idle it is actually air escaping the air intake not leaking in.

Some over tighten the spring when they experience this which only causes the blowoff to not work properly under full boost.

John

Its a TurboXS bov. I didn't know they were adjustable, I never took it apart or anything. I was just curious if there was any way to test it besides having it mounted on the truck. There isn't much to them, so there really isn't anything that would break.

http://www.summitracing.com/parts/TXS-BOV-H-RFL/?image=large

 

[Windedv6]

Re: Testing a blow off valve?

Its a TurboXS bov. I didn't know they were adjustable, I never took it apart or anything. I was just curious if there was any way to test it besides having it mounted on the truck. There isn't much to them, so there really isn't anything that would break.

http://www.summitracing.com/parts/TXS-BOV-H-RFL/?image=large

I have the same one on my AWD. I did put a shim washer in mine to adjust it for high boost levels (25 lbs plus). Other than that it works great!

John

 

[gary sy]

Re: Testing a blow off valve?

no one knows how to test this blow off valve ?????????????/

 

[MRKING]

Re: Testing a blow off valve?

mightyvac brake bleeder will work , they even say wastegate testing as an option on the back of the package . most autoparts stores will have them

 

[gary sy]

Re: Testing a blow off valve?

i have a hand wac pump can u tell what to do to test the blowoff valve with it?

 

[MRKING]

Re: Testing a blow off valve?

hook it up , pump until it reaches desired psi or it may be in hg on the dial .6 hg is roughly 20 psi .

it will open the wastegate/blowoff once pressure reaches the base setting

 

[gary sy]

Re: Testing a blow off valve?

well a blow off valve works under boost right and if there is boost then there is no vacume right or not?

 

[gary sy]

Re: Testing a blow off valve?

my boost guage tells me so right or wrong

 

[Darin]

Re: Testing a blow off valve?

It uses spring pressure to keep it closed, well a single port BOV/wastegate does anyways. Upon the the throttle plate closing and vaccuum entering the BOV it opens it.

There are some check valves and shit on the syty vac harness. Make sure the guy has it T'eed into something directly off the manifold, not further down the harness. Also, it will not work if it's tied into the vac lines on the turbo for operating the wastegate. It needs to be tied into somehwere AFTER the throttle body and not with some fancy check valves on it.

 

[MRKING]

Re: Testing a blow off valve?

yes they work off of boost , let me get the instructions and get back with you .

 

[gary sy]

Re: Testing a blow off valve?

i teed off the vac line from the fuel presure reg and i know its good cuz when its pulled off the motor dies?

 

[MRKING]

Re: Testing a blow off valve?

what i said earlier was close , just switch it to pressure from the vac setting it usually comes as .

 

[gary sy]

Re: Testing a blow off valve?

ok thankyou ill try that where did u tee off of for your vac line?

 

[MRKING]

Re: Testing a blow off valve?

on my edelbrock intake rear port , that may not help you though .lol

 

[Sy-1177]

Re: Testing a blow off valve?

Is there a check valve on that vac line that goes to the fuel pressure reg? I can't recall off hand. If so, there's your problem. I used that front intake port as I knew there were no restrictions in the line.

 

[43t_ftw]

Re: Testing a blow off valve?

when i first put on my Tial BOV it wouldn't work T'd into the line to the fuel pressure regulator think i tryed it on that one first, i ended up finding a different line of the front of the manifod to T into, cant remember witch one but worked fine after that, i bet it works just need to find different vac source, realy not much can go wrong with a BOV

 

[gary sy]

Re: Testing a blow off valve?

still not working hooked up a vac pump will not hold any pressure at all ive tried 5 different sorces and still nada? i know it cant be that hard. there must be a seal any idea where i may finde new o rings ? must be a seal bad.

 

[gary sy]

Re: Testing a blow off valve?

any one know if or where a blow off valve can be serviced need o rings