quick blower ic setup question....(bov related)

turbot4 · June 13th, 2009, 11:51 AM

just wondering if i have my ic set done correctly.....
at part throttle i feel like the valve maybe openeing and closing, which i think is normal..
when i rev the car and release the pressure, i get a fluttering noise...as my bov is venting back into the power pipe....
is this bov flutter or commpressor surge?....
just want to make sure i have my setup done correctly..(don't want to hurt the sc or the car)
my bov (stock vortech) connects to my tb ic pipe, and then connects again to the power pipe...the mass and filter are in the fender...
here is a pic and video of what it sounds like and looks like..

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Black Bullitt · June 13th, 2009, 02:45 PM

Are you running the stock BPV? I know my stock BPV doesn't sound like that. I don't recall the exact number, but if you're pushing past a certain # of boost the stock one isn't going to bleed off that pressure like a larger one can. You'll have to upgrade to the Vortech mini race BPV.

turbot4 · June 13th, 2009, 07:20 PM

it is the stocker, but i have a bigger bosch dsm bov, thinking of swapping it in ...

Black Bullitt · June 13th, 2009, 07:38 PM

I would since you are already pushing what about 10#s IIRC?

turbot4 · June 13th, 2009, 09:00 PM

yeah, the dsm bov is much larger than the stock vortech, they appear to work the same and the dsm valve has a stiffer spring than the vortech....i gotta get some new rubber piping next week, and i will install it...i'll post up when i do since nobody else wants to chime in..

oh yeah, what's IIRC mean?

mustanginky · June 13th, 2009, 11:54 PM

IIRC=If I Remember Correctly...
yes that fluttering noise is the bpv blowing back into the intake tube. or at least that's the sound mine makes. but it's never a bad idea to upgrade bpv's.

turbot4 · June 14th, 2009, 07:23 AM

so switching to a blow off valve from a bypass will be bo different?...i won't be venting it, so it will work just like the vortech bpv...it's much larger and has a stiffer spring so i think i will benefit from it...
so since they both work the same, i should have no problems correct?

Black Bullitt · June 14th, 2009, 08:47 AM

Right. They both funtion the same. In this case they work as a bypass valve since your MAF is before the BPV. That air is metered, so you can't make it a BOV. If the MAF was after the BPV then it would funtion as a BOV and you can blow off to the atomoshpere.

mustanginky · June 14th, 2009, 11:01 AM

yup if you're a draw thru system you can't blow it off to the atmosphere. you'd be wayyy too rich if you did that lol.

Eagle2000GT · June 14th, 2009, 04:52 PM

I've not seen the vortech BPV, but I'm assuming that it works the same as a Procharger if both are blow through systems. I'm not sure why you want a stronger spring. The throttle body controls how much boost your engine gets. Unless the throttle body is wide open the excess boost has to go somewhere and that's out the BPV. And they do make a lot of noise when you go WOT and then let off.

Mine made excess noise because it was loosing vacuum, not because of the spring. There wasn't enough vacuum to hold it wide open so the excess pressure had to sqeeze through a smaller opening.

You can basically tell how open your BPV should be by looking at your vacuum/boost gage. The more vacuum the wider it is open. At idle it should be fully open. As vacuum goes down, the spring closes it. When the gage shows boost then not only the spring but the pressure is holding it closed.

turbot4 · June 14th, 2009, 08:32 PM

well, i believe at part throttle driving , my stock vortech is not staying closed causing a few blips every now and then , my tuner says it's normal, but i think with a bigger stiffer bov, it should help the problem.....and release pressure much quicker
does that make sense or am i way off?...

Eagle2000GT · June 14th, 2009, 10:45 PM

I don't think that's correct. A centrifical supercharger builds boost with rpm but it doesn't matter how high the rpm or how much boost you're generating if you are at partial throttle your vacuum/boost gage will show vacuum. The butterfly valve in your throttle body has the boost from your supercharger blocked. It needs to go somewhere that's why the BPV is open. I've tested this by driving at 5000 rpm in third down the highway. You can hear the pressure roar out the BPV. If it didn't the pressure would be forced back into the supercharger damaging it. Ideally the BPV and the throttle body valve work together but in opposite directions.

turbot4 · June 14th, 2009, 11:32 PM

but either way , using a larger bov the same way the bpv is set up will work right?...

Eagle2000GT · June 15th, 2009, 01:53 AM

A larger diameter BPV should work the same way. It's diaphram and spring should be balanced to operate correctly. You ought to call Vortech and ask.

jivepepper · June 15th, 2009, 05:29 AM

There's a bigger volume of air now and I doubt the stock bypass can keep up. That's why you hear the flutter now.

turbot4 · June 15th, 2009, 07:30 AM

Originally Posted by jivepepper

There's a bigger volume of air now and I doubt the stock bypass can keep up. That's why you hear the flutter now.

thats why i thought with the bigger valve should help it out..i'll find out later this week..

gotta get to the junkyard to get some hose..the local autoparts store only sells radiator hose that big and it cost alot more than expected being i need to by a radiator hose so i need to wait..

jivepepper · June 15th, 2009, 09:04 AM

Originally Posted by turbot4

thats why i thought with the bigger valve should help it out..i'll find out later this week..

gotta get to the junkyard to get some hose..the local autoparts store only sells radiator hose that big and it cost alot more than expected being i need to by a radiator hose so i need to wait..

If you lived a little closer I would probably have some. What size pipe did you use for the intercooler?

turbot4 · June 15th, 2009, 08:56 PM

3inch...pepper, where do you live?...

anyway if i can't get any hose, i'll just hit the local you pull it at the boneyard...i'm sure the'll more than likely give it to me...

jivepepper · June 15th, 2009, 09:13 PM

Right at the end it looks like the stock vortech pipe. Morgantown WV.

turbot4 · June 16th, 2009, 07:28 AM

no , it'snot...speaking of i need to put that one for esale on ebay.

i thought you were in pa..

June 13th, 2009, 07:20 PM	#3
turbot4 Hardcore Enthusiast R.I.P. twin screwed!! Join Date: Jan 2009 Location: lebanon pa Posts: 2,377 iTrader: 9 reviews	it is the stocker, but i have a bigger bosch dsm bov, thinking of swapping it in ... __________________

June 13th, 2009, 09:00 PM	#5
turbot4 Hardcore Enthusiast R.I.P. twin screwed!! Join Date: Jan 2009 Location: lebanon pa Posts: 2,377 iTrader: 9 reviews	yeah, the dsm bov is much larger than the stock vortech, they appear to work the same and the dsm valve has a stiffer spring than the vortech....i gotta get some new rubber piping next week, and i will install it...i'll post up when i do since nobody else wants to chime in.. oh yeah, what's IIRC mean? __________________

June 13th, 2009, 11:54 PM	#6
mustanginky MM Fanatic 2000 gt Join Date: Feb 2009 Location: La grange, KY Posts: 4,259 iTrader: 2 reviews	IIRC=If I Remember Correctly... yes that fluttering noise is the bpv blowing back into the intake tube. or at least that's the sound mine makes. but it's never a bad idea to upgrade bpv's. __________________ Procharged 2000 5 Speed BAB GT, built motor, blower cams, speedy dyno tune 412 hp, 450 rw tq HARDCORE CREW BRIGHT ATLANTIC BLUE CREW #1 MEMBER

June 14th, 2009, 07:23 AM	#7
turbot4 Hardcore Enthusiast R.I.P. twin screwed!! Join Date: Jan 2009 Location: lebanon pa Posts: 2,377 iTrader: 9 reviews	so switching to a blow off valve from a bypass will be bo different?...i won't be venting it, so it will work just like the vortech bpv...it's much larger and has a stiffer spring so i think i will benefit from it... so since they both work the same, i should have no problems correct? __________________

June 14th, 2009, 11:01 AM	#9
mustanginky MM Fanatic 2000 gt Join Date: Feb 2009 Location: La grange, KY Posts: 4,259 iTrader: 2 reviews	yup if you're a draw thru system you can't blow it off to the atmosphere. you'd be wayyy too rich if you did that lol. __________________ Procharged 2000 5 Speed BAB GT, built motor, blower cams, speedy dyno tune 412 hp, 450 rw tq HARDCORE CREW BRIGHT ATLANTIC BLUE CREW #1 MEMBER

June 14th, 2009, 04:52 PM	#10
Eagle2000GT I Post Entirely Way Too Much 2000 Mustang GT 12.73@111.36 Join Date: Aug 2007 Location: Shelbyville, IN Posts: 5,311 iTrader: 1 reviews	I've not seen the vortech BPV, but I'm assuming that it works the same as a Procharger if both are blow through systems. I'm not sure why you want a stronger spring. The throttle body controls how much boost your engine gets. Unless the throttle body is wide open the excess boost has to go somewhere and that's out the BPV. And they do make a lot of noise when you go WOT and then let off. Mine made excess noise because it was loosing vacuum, not because of the spring. There wasn't enough vacuum to hold it wide open so the excess pressure had to sqeeze through a smaller opening. You can basically tell how open your BPV should be by looking at your vacuum/boost gage. The more vacuum the wider it is open. At idle it should be fully open. As vacuum goes down, the spring closes it. When the gage shows boost then not only the spring but the pressure is holding it closed. __________________ ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370 Mods list in Garage.

June 14th, 2009, 08:32 PM	#11
turbot4 Hardcore Enthusiast R.I.P. twin screwed!! Join Date: Jan 2009 Location: lebanon pa Posts: 2,377 iTrader: 9 reviews	well, i believe at part throttle driving , my stock vortech is not staying closed causing a few blips every now and then , my tuner says it's normal, but i think with a bigger stiffer bov, it should help the problem.....and release pressure much quicker does that make sense or am i way off?... __________________

June 14th, 2009, 10:45 PM	#12
Eagle2000GT I Post Entirely Way Too Much 2000 Mustang GT 12.73@111.36 Join Date: Aug 2007 Location: Shelbyville, IN Posts: 5,311 iTrader: 1 reviews	I don't think that's correct. A centrifical supercharger builds boost with rpm but it doesn't matter how high the rpm or how much boost you're generating if you are at partial throttle your vacuum/boost gage will show vacuum. The butterfly valve in your throttle body has the boost from your supercharger blocked. It needs to go somewhere that's why the BPV is open. I've tested this by driving at 5000 rpm in third down the highway. You can hear the pressure roar out the BPV. If it didn't the pressure would be forced back into the supercharger damaging it. Ideally the BPV and the throttle body valve work together but in opposite directions. __________________ ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370 Mods list in Garage. Last edited by Eagle2000GT; June 14th, 2009 at 10:51 PM.

June 14th, 2009, 11:32 PM	#13
turbot4 Hardcore Enthusiast R.I.P. twin screwed!! Join Date: Jan 2009 Location: lebanon pa Posts: 2,377 iTrader: 9 reviews	but either way , using a larger bov the same way the bpv is set up will work right?... __________________

June 15th, 2009, 01:53 AM	#14
Eagle2000GT I Post Entirely Way Too Much 2000 Mustang GT 12.73@111.36 Join Date: Aug 2007 Location: Shelbyville, IN Posts: 5,311 iTrader: 1 reviews	A larger diameter BPV should work the same way. It's diaphram and spring should be balanced to operate correctly. You ought to call Vortech and ask. __________________ ProCharger P-1SC, 9 psi, STD 396/383; Uncorrected 388/375; SAE 383/370 Mods list in Garage.

June 15th, 2009, 05:29 AM	#15
jivepepper I Post Entirely Way Too Much Join Date: Mar 2006 Location: Under a sombrero Posts: 5,025 iTrader: 1 reviews	There's a bigger volume of air now and I doubt the stock bypass can keep up. That's why you hear the flutter now. __________________ 665/541 WHP/WTQ 4.6L SOHC 2V ON 93 OCTANE PUMP GAS. NO METH INJ., NO E85, NO RACE GAS, N2O BABY BOTTLES! TRAP=POWER: 11.01 @135, IN SUMMER HEAT, 1350' TRACK, 315/35/17 DR'S

June 15th, 2009, 08:56 PM	#18
turbot4 Hardcore Enthusiast R.I.P. twin screwed!! Join Date: Jan 2009 Location: lebanon pa Posts: 2,377 iTrader: 9 reviews	3inch...pepper, where do you live?... anyway if i can't get any hose, i'll just hit the local you pull it at the boneyard...i'm sure the'll more than likely give it to me... __________________

June 15th, 2009, 09:13 PM	#19
jivepepper I Post Entirely Way Too Much Join Date: Mar 2006 Location: Under a sombrero Posts: 5,025 iTrader: 1 reviews	Right at the end it looks like the stock vortech pipe. Morgantown WV. __________________ 665/541 WHP/WTQ 4.6L SOHC 2V ON 93 OCTANE PUMP GAS. NO METH INJ., NO E85, NO RACE GAS, N2O BABY BOTTLES! TRAP=POWER: 11.01 @135, IN SUMMER HEAT, 1350' TRACK, 315/35/17 DR'S

June 16th, 2009, 07:28 AM	#20
turbot4 Hardcore Enthusiast R.I.P. twin screwed!! Join Date: Jan 2009 Location: lebanon pa Posts: 2,377 iTrader: 9 reviews	no , it'snot...speaking of i need to put that one for esale on ebay. i thought you were in pa.. __________________

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