ive searched and havent found a concrete answer.

I have a greddy type s BOV and was wondering if there was a proper way of adjusting it. I am running at stock boost. anything helps. thanks

kevin

 

get a wrench and turn the thing on top, should say "harder" and "softer"

 

how hard or soft tho?

 

I think you can only go so far before it stops, i know on mine its all they way hard, because without breaking it its not going to go any harder

 

Too hard and you'll get compressor flutter (woop woop noise) - you need to loosen it a bit.

 

Its not set that hard to get any fluttering

 

I've got the same bov, got mine set as hard as it will go. Haven't had any probs

 

what if it doesn't open won't you kill your turbos?

 

That's a whole new topic Some say yes, some say no. I personally feel they do.

 

if the air is not releassed when your the trottle closes then the air might go backwards causing the wheels on the turbo to spins backwards which is really bad...no?
turbo wheels are going a certain + k rpm and then poufff -k rpm...ouch.

 

i think it depends on wat kind of turbo you have. if u have small turbines, then a BOV might be a good investment. If u're using larger turbines with thicker shafts, then u may not have to worry. This is what i've been told anyway. Also, the response is better without BOV.

I'm dun post much, but would like to hear the discussion on this topic becoz i haven't heard a strong arguement for or against the BOV.

Another unrelated question, i'm using a blitz nur exhaust. Recently i bought a silencer and installed it. Ever since i had it on, i noticed higher exhaust temp. U guys think the high temp is related to the newly installed silencer? anyone has a silencer plugged up their car's butt? noticed any difference on the exhaust temp?

 

For most BOV's that have an adjustable spring, what you do is:

1. Loosen the spring adjustment all the way
2. Start the car and you should have a vacuum leak (since the spring is too loose to close the valve)
3. Slowly tighten the spring adjustment until the vacuum leak is gone
4. Take it for a drive

If you loosen the spring adjustment all the way loose and the valve doesn't leak, then it really doesn't matter how soft you set it. However, if the spring is set too hard, it might might open when it should causing compressor surge (which is not good for your turbos).

 

the 2 main purposes for adjusting this is for throttle response and sound pleasure.

the BOV sensitivity can cause alot of engine torque. the looser you go the easier it is on the engine, but you are losing boost. it may take a few trys to adjust it where it holds boost but not too much of a jerk when accelerating. of course, if u have extra stiff motor mounts, you would never notice it.

i also do not agree to make it too tight. back preassure on turbos is 1 reason, but it also affects driveability.

 

i heard many cars with that fluttering sound and was wondering if it was a certain BOV. But i guess the fluttering sound is due to the backpressure of air not being release causing the turbos to spin backwards. Am i right, fluttering is bad? so that means too tight are bad for the turbos... makes since.

Thanks Mahjik for your advice on proper adjustments.

 

The fluttering you heard on those cars was probly the wastegate sound.