bov question

[DisEpyon]

i have a 7 psi tial bov and when the car is on idle it opens up about half way causing a leak and the motor doesnt idle right. i put my brothers 11 psi spring bov on and it still opens up a little bit and the motor still doesnt idle right. but when i plug up the vac hose to the bov it idles perfect. my bov is on my cold pipe. do i need a higher spring? my boost guage reads at -20 to 22.
please help me.
thanks, brent

[misfitsfreak81]

where are you running the vacume source from? do you have it tee'd to anything else?

[crazybb]

my buddy had the same problem and he had to put a stiffer spring to make it work

[GSXRJJordan]

yeah, the BOV isnt just supposed to work on a spring, it needs its own (non tee'd) vacuum line connection from the coldpipe or the throttle body. It shouldn't matter which side of the intercooler your BOV is on, although most of us run them closer to the turbo.

[sean350z]

vaccum is def your problem...
you should recirculate it....even if it still leaks you wouldn't run into the idle problem with it recirculated

[DisEpyon]

right now i have it connected to my manifold and teed off with the wastegate.
so i guess i shouldnt tee it with the waste gate? then itll run better?

[punxva]

yes you should run it straight to one of the vacuum lines under the throttle body

[S14DB]

Make sure you have the right spring for your application:
http://www.tialsport.com/documents/w3_tial_bov50_sp.pdf

[DisEpyon]

ok, after hooking the wastegate up to one of the vac sources under the mani, its much better. on the 11 psi spring. cause i know for a fact that my 7 psi is way to soft. my boost guage is ranging from -20 to -22, more around -21. so do you think that 11 psi spring is perfect? it still opens up just a little bit when on idle. but idles alright still.

now i have another problem for anyone that knows. today after fixing that problem and bleeding my brakes and clutch, i got to drive my car for the first time. but the problem is ,when i push in the clutch ,the car dies out on me or stalls. so for instance , when i try and take off and push the clutch in to 1st gear, it will die, so i have to gas it or itll die. then when going around a corner coming out of 3rd gear trying to put it in 2nd gear itll die out on me.

and also, where can i buy a new throttle cable, cause the one im using doesnt work great. before it was too short at the end where it goes to the tb and to my bracket, so i had to customize it and make it longer, but it still doesnt work out great. right now i have it bolted in the two holes on the greddy intake mani, cause i couldnt figure out a way to get a bracket or make one. could it be the angle or what?

thanks, brent

[DisEpyon]

had help figuring out my car stalling problem. it all adds up to being the bov. the tial bov is a vented and not a recirculating one. like i should had bought.after i pluged up the blow off valve the car didnt stall out on me when pushing the clutch in anymore. but now i have another problem, is there a way to make my tial bov work, cause im not buying a new bov. i was told there is a system that helps bybass the maf sensor to make the bov work. and i guess 11 spring is good for me?

thanks, brent

[S14DB]

I would get the -12psi spring to keep it closed if you are having launch problems. When you let out the clutch the engine sees more load and the vac goes up opening up the BOV and allowing unmetered air in. Should be soft enough to still blow off effectively when you let off the gas.

What are you using for management? Stock ECU?SAFC?

[Bay_Area_sr20det]

could juat get a pull type, will never leak on idle.

[DisEpyon]

yes i am running stock.

would the hks vpc system be the best way to get rid of this problem or is there another way to do it easier?
what do you mean by a pull type?

[spdfreek0o]

go blowthrough

[smelly240]

VPC are hard to find IIRC - you can use www.map-ecu.com (similar to VPC and used a lot in supra communities) or use powerFC D-Jetro or AEM. or megasquirt, or haltec, etc.

Theres also the option of runnin blowthrough - which i did for a long time and it worked good but i went back and remembered how much i liked the insta-flame get off my ass in traffic "mechanism" with the blowthrough it still spews toasties runnin it hard tho

I'm just trying to list options for oyu to look at since VPC is old stuff that i havent seen in a while.

edit** VPC is still effin expensive - 700+- bucks **

if you dunno what blowthrough is - its running the maf in your cold side IC piping - you'd have to move oyur bov to the hot side for this. you also need as much straight pipe as you can get on each side of it - and you should use a Z32 maf - stock ones made my car run funny.

pull type is a HKS SSQV or racing Type II (400+$) maybe the apexi dual one??? not sure -

[DisEpyon]

out of all those options you listed , which would be best ,yet cheapest and easy?
im not doing blow through, cause i dont want to redue all my pipeing and bov.

[SoSideways]

Getting the correct spring for your BOV would probably be the easiest/cheapest way to go around it. Also, check to make sure that your BOV is seeling the vacuum signal from the correct vacuum port.

I used the top right nipple from the intake manifold IIRC just above the throttle body on my S13 black top engine.

If all else fails, seems like you need a new BOV. If that's the case, PM me and I'll get you a good deal on the HKS SSQV BOV.