Hi,

The previous thread I opened was dead serious about me fitting some kind of BOV noise out of the sprintex supercharger in my 99 verada.

The youtube refence was to show you what I was after, sorry if people thought it was an invitation to post up youtube vids.

So yeah, Ashneel's idea about running something of the bypass valve sounded actually half decent. Does anyone else here have any thoughts or any other suggestions to the topic?

if you want it done properly go to a respected tuning shop that actually do these things and ge tthem to have a look at it.

if it makes boost it will dose but you just gotta find out how.

i thought u couldnt run BOV's that vent into the atmosphere unless you get rid of the MAS sensor? (ie full aftermarket ecu)...?

You "can" run them...

But it will affect your afr as the afm has already measured that air. if it doesnt make it into the engine your car will run rich for a second as it vents.

My silvia used to do this and id get black soot on my rear bar from it.

So yes it can be done. but with side affects

You can also buy exhaust BOV's, sure they're not the real thing but sound the same and won't affect your car negatively. Normally I curse at people who use these, but usually they're on stock excels lol. But seen as you have a supercharger no one would know?

A BOV on a supercharged car is exactly the same as a turbocharged car. Fit it to a piece of boost piping, and feed it a vacuum line from after the throttle body so that it see's vacuum on 0% throttle.

The vacuum on one side of the piston, and boost on the other will lift the piston and vent excess pressure.

Problem with that is, there is pressure on the throttle all the time, so the BOV will remain open. This, unless vented back to after the MAF but before the supercharger will cause problems.

It is actually benificial to do this, because without a release for the SC air when cruising or at low throttle, it actually loads the motor more because the SC has to work harder. It should already have one on a decient setup, but it wont make any noise or even look like a std BOV. They are specially made for SC to pass high volumes of air.

Doesn't the Sprintex sourced supercharger use a by-pass valve that recircs excess boost? Like in the Eaton 4th gens?? This is now used very commonly in air tools to decrease compressor workload, increase tool efficiency etc.

no the bypass valve is open when the manifold is in vaccuum the air enters the manifold pre supercharger, as soon as it comes onto boost the valve snaps shut and the air is supplied through the s/c

the s/c supplies air to the manifold at all times, but the by pass valve helps when you nail it and the engine takes a big gulp of air before the s/c can spool up

Bah, be happy with what you got. Your car sounds like a jet engine, mine sounds like a minature steam train.

You can't have it all :cool:

You can't have it all :cool:


he can try, leather climate sunroof... list goes on ;) mmmm verada..:drool:

What is a BOV??

What is a BOV??
blow off valve, it kinda sounds like the whoosh sound your hear in turbo cars

blow off valve, it kinda sounds like the whoosh sound your hear in turbo cars
Is it a performance enhancer or just something that makes car sound better

Is it a performance enhancer or just something that makes car sound better

it releases the pressure thats been forced into the engine
cause as soon as you take your foot off the accelerator the air flow will not go into the engine (throttle body butterfly is closed) and has to come back the way it came
which can be harmful for turbos
BOV gets rid of the pressure so it doesnt go back into the turbo

it also prolongs the life of your butterfly valve:D

it also prolongs the life of your butterfly valve:D

bov come on all turbos otherwise everytime you release the throttle some pipe along the line somewhere will burst. This thread is for the aftermarket noisy illegal ones. They dont make any difference to engine.

ok a lot clearer now

bov come on all turbos otherwise everytime you release the throttle some pipe along the line somewhere will burst.

actually not true.. a friend of mine just finished building up the RB30 in his VL and deliberately didn't include a BOV, either recirculating or atmosphericly venting.. his claim is that in all the research he's done (and he's done a lot) there's no evidence that the rebounding wave off the closed throttle has any effect on the life of the turbo at all.

i read a motorbike magazine and it had a 500hp Suzuki Hayabusa Turbo, running 32psi of boost and blitzing the low 6's on the qtr mile. N e way it had a HKS hypersonic bov and it still bent 3 sets of butterflys...so it dose happen even with bovs never really herd of it crapping on a TB with boost below 26psi...so only on mssive boot lol.

is any1 familiar with the hayabusa? 145kw...208kg...1.3Lengine...out accelerates a bugatti veyron. My dads got 1 it is the most psycho vehicle...its seriously scary:nuts:

OMG how can he run the VL with out a BOV bro!

no ssssstssstsststststs thats just not on :rant:

i burnt the sound effect on to a cd just to be a knob 1 day, people actually thought it was real and wanted to see my engine, i just told em it was top secret lol

is your V-rada auto, because a loud BOV isn't that much fun without a manual, as mentioned above it vents excess air once the butterfly is closed, with an auto you'll just be venting a lil bit of air between changes but i don't think it will be that noticable, the only time would be when you reach the speed limit, and then its usually a case of easing it off and keeping slight acceleration, which again limits the sound. best way would be is gunning it so engine revs up to at least 3000rpm and then the auto do the shifting to get a big drop in rpm and pressure. or you could pretend to be manual and take ur foot off between gear changes, but that can be damaging.

someone correct me (nicelylol) if i'm wrong!

or he could just use the tiptronic to change gears, and get it high in the revs then change...?

or get a manual transplant lol

i read a motorbike magazine and it had a 500hp Suzuki Hayabusa Turbo, running 32psi of boost and blitzing the low 6's on the qtr mile. N e way it had a HKS hypersonic bov and it still bent 3 sets of butterflys...so it dose happen even with bovs never really herd of it crapping on a TB with boost below 26psi...so only on mssive boot lol.

friend is running about 18psi so he's nearly there lol but GTV_KruzR mentions another good point.. this dude has a 3 speed auto box so he's not closing the throttle on a change anyway.

personaly i despise autos (no offence) and think putting a bov on a s/c auto is pointless

plus u wouldnt like to attract pplz attention away from the jet engine noise coming from under ure bonnet

personaly i despise autos (no offence) and think putting a bov on a s/c auto is pointless

plus u wouldnt like to attract pplz attention away from the jet engine noise coming from under ure bonnet

so do I lol but they have their uses in purpose built drag cars - not least of which is consistency. this one's got a 4000rpm stall converter which is just nuts on the street.

getting way off topic now so I'll shut up.

The pressure build up in a turbo manifold if a bov is not there would be insane. Butterflies will literally be flying around.

his claim is that in all the research he's done (and he's done a lot) there's no evidence that the rebounding wave off the closed throttle has any effect on the life of the turbo at all.

Only real down side to no BOV (on a manual car) is that the rebound waves can slow the turbo down between shifts adding a little lag (not a problem on autos).

HANG ON PEOPLE.

the sprinteks blowers have a draw through throttle set up, there is no pressure on the throttle, except for vacume. closing the throttle does note result in the spike of pressure against the throttle that a turbo, or crentrifugal blower does. To fit the BOV, you would have to do it like a Turbo diesel, with out a throttle. Im not even sure how that is done.

Since the blower always spins at the same speed as the motor, the only thing you have to worrie about is vacume.