"turkey" Day

[MazdaSpeedTurbo]

you are in the right direction ^^^

i knew it lol (pow) i had a hks ssqv on my stock pipes and it was surging i loosened the valve and as i kept loosening it would go away more and more till it was gone and hks sounded great.

 

[Dr.Sound]

it's not the stock BPV making the sound,
and everyone that says that our BPV dosnt flow enough air is WRONG.
go look at any RX-7, they all use same BPV as us in stock form.......and that's on a twin-turbo car!

 

[TiGrayMsp716]

I don't understand how a bpv can actually release pressure. Just look at it. There's only about a foot of tubing to release pressure. The air bounces off the throttle plate goes thru the bpv and tubing and back in front of the turbo. It's a closed circuit. So it had a set volume of air, plus the turbo is still creating pressure.

 

[ricenudles]

Off topic but...

THIS is why people need to stop saying s*** like "go search noob." Topics such as the infamous turkey needs to be revisted over and over again. Unless all of you have some sort of degree in egineering, or even any degree at all, you can't say your answer is correct and is forever correct. Hell, even then those people with degrees and PhDs aren't always correct either.

Anyways...someone on this forum said that the placement of the bpv is causing the noise, not compressor surge. I'm not agree or disagreeing, but those of you who know, any opinions?

 

[MrDiggler]

i dont know why but i always thought the "turkey" was cool, althought its funny as s*** to hear it.

Off topic, but I have to share this:

I let my mom borrow the MSP for a day so she could go rip up some mountain roads in it (very cool mom, btw). After she'd been driving it a while she called me and asked what the hell that noise was when she shifted. I knew what it was but asked her to describe it anyway, and she said "it sounds like you've got a pissed-off turkey under the hood". I told her that the turkey was original equipment on our cars and to enjoy it!

 

[Moscarsado]

just to let you guys know, the turkey noise or fluttering, what ever u want to call it, is created by our s pipe on the turbo, to the downpipe. Free that up and no more gobble gobble. The dual set up that some guys on here are doing, works, but with the dual set up, your letting out to much pressure, so then it takes the turbo longer to spool back up and your actually losing alittle power, cause all the air is gone, now the turbo has to fill the pipes up again. You could actually take off the s pipe, get it ported out, and your good to go. But some copanies are in the middle of making us new s pipe.

 

[MazdaSpeedTurbo]

just to let you guys know, the turkey noise or fluttering, what ever u want to call it, is created by our s pipe on the turbo, to the downpipe. Free that up and no more gobble gobble. The dual set up that some guys on here are doing, works, but with the dual set up, your letting out to much pressure, so then it takes the turbo longer to spool back up and your actually losing alittle power, cause all the air is gone, now the turbo has to fill the pipes up again. You could actually take off the s pipe, get it ported out, and your good to go. But some copanies are in the middle of making us new s pipe.

hmmm i disagree totally i dont have dual setup and turkey is there all time i had a bov and i loosened it till there was no turkey the turkey is compressor surge from by-pass valve to much air trying to be passed at once causeing back pressure. causing surge

 

[xXxJIGGAxXx]

I don't think our compressor surges. How can our turbo surge when I get the turkey at very very low boost levels? From my understanding a compressor will surge at HIGH levels of pressure. I just think we hear the air moving back into the intake. My old Vortech kits BPV was angled at 90 degrees. I always wanted to put that BPV on my MSP, sweet CNC aluminum for $100 but then I sold the Vortech. I think if someone puts an angle change in the recirculated airflow the sound will change or go away.

 

[Moscarsado]

read me

I understand its compressor surge, that is due to the s pipe, its not flowing properly. So of course whan u open your bov all the way, its gonna flow thru there. I already ported 2 s pipes and no turkey with stock set up. My msp personaly, im waiting till a company makes a new s pipe, but two of my friends begged me to do theres and it came out pretty good, alot more power and no gobble gobble

 

[t3ase]

I understand its compressor surge, that is due to the s pipe, its not flowing properly. So of course whan u open your bov all the way, its gonna flow thru there. I already ported 2 s pipes and no turkey with stock set up. My msp personaly, im waiting till a company makes a new s pipe, but two of my friends begged me to do theres and it came out pretty good, alot more power and no gobble gobble

...you can't really hear the turkey with a "stock setup".

 

[girth]

...you can't really hear the turkey with a "stock setup".

Sure you can. I'm stock and hear the turkey no problem when shifting at 4k.

Since, according to the original poster, nobody has said it's compressor surge with 100% certainty, I'll say it -- it is compressor surge. Of this I am 100% certain. If your buddies want surge it's real easy to get - put a poor flowing BOV or recirc on.

 

[505zoom]

Sure you can. I'm stock and hear the turkey no problem when shifting at 4k.

Since, according to the original poster, nobody has said it's compressor surge with 100% certainty, I'll say it -- it is compressor surge. Of this I am 100% certain. If your buddies want surge it's real easy to get - put a poor flowing BOV or recirc on.

yea, just tell them to take out the BOV if they want their car to sound like that.

 

[MazdaSpeedTurbo]

Sure you can. I'm stock and hear the turkey no problem when shifting at 4k.

Since, according to the original poster, nobody has said it's compressor surge with 100% certainty, I'll say it -- it is compressor surge. Of this I am 100% certain. If your buddies want surge it's real easy to get - put a poor flowing BOV or recirc on.

hey now i said it with 100% certainty

 

[Emode]

just to let you guys know, the turkey noise or fluttering, what ever u want to call it, is created by our s pipe on the turbo, to the downpipe. Free that up and no more gobble gobble. The dual set up that some guys on here are doing, works, but with the dual set up, your letting out to much pressure, so then it takes the turbo longer to spool back up and your actually losing alittle power, cause all the air is gone, now the turbo has to fill the pipes up again. You could actually take off the s pipe, get it ported out, and your good to go. But some copanies are in the middle of making us new s pipe.

i have the ion TBack with the bigger s pipe and the turkey is the same as it always has been. I think its a combination of bov/bpv placement and weak vacuum sources.

 

[_Sloteg_]

just to let you guys know, the turkey noise or fluttering, what ever u want to call it, is created by our s pipe on the turbo, to the downpipe. Free that up and no more gobble gobble. The dual set up that some guys on here are doing, works, but with the dual set up, your letting out to much pressure, so then it takes the turbo longer to spool back up and your actually losing alittle power, cause all the air is gone, now the turbo has to fill the pipes up again. You could actually take off the s pipe, get it ported out, and your good to go. But some copanies are in the middle of making us new s pipe.

I think your wrong! I helped install a guy's ION 3" turbo back exhaust and, that system has a new S-pipe with two seperate passage's for wastegate and exhaust flow and it made no diffrence it still has the turkey.so i don't see how porting the stock S-pipe would make a diffrence!?!? I thought that might be the problem aswell since the stock S-pipe has the exhaust/waste gate flowing through the same pipe and, it was causing turbulence(sp) that was making the sound but i guess that was wrong!(pow)

 

[DSMConvert]

the turkey sound is cause by both the placement and the type of bov/bqv. basically what is happening is that the vac. line coming from the manifold into the valve causes it to open and close(yes i know common knowledge), but when the valve opens vac/boost is reduced causing it to close again, and then pressure instantaneously builds up and it opens and closes again. Basically its a rapid open and close caused by slight changes in the manifold pressure/vac line. Since ours only has one source it "cycles" very quickly. For those of you with car knowledge this is the same thign that happens with the thermostats when the temp sensor isnt set correctly. ie the open and close temps are the same instead of having a 5 degree window. Another contributing factor is the low boost at which our cars run..the air doesnt have the force nor the velocity(as force is a function of velocity) to keep the valve open by shear movement. As boost increases it will have more of a whoosh sound caused by the overwhelming force and velocity of the air through the re-circ. valve. it HAS NOTHING to do with neither the s-pipe or the plastic pipes. to get rid of it I would suggest both getting a aftermarket "dual-source" BOV like a hks ssq, or greddy type s and turning up the boost. Personally i like the turkey or Butterfly as we used to call it back in the day...

 

[spacemonkey]

hmmm i disagree totally i dont have dual setup and turkey is there all time i had a bov and i loosened it till there was no turkey the turkey is compressor surge from by-pass valve to much air trying to be passed at once causeing back pressure. causing surge

hmmm..that may be, but my BOV has the softest sprign possible and i know it vents off a good amount of air...better then stock atleast. But Im still getting a louder and longer gooble...i'll post clips ASAP. What I've been told is that compressor surge has a higher pitch...I've been told its more like a squealing turkey then a angry one. People who have gotten compressor surge seemed pretty confident that its not compressor surge thats causing the flutter. I know Tom at Forge is confident its not compressor surge and he designs and manufatuers BOVs. But its good to debate and visit these topics from time to time. Im not ruling out compressor surge. I like tghe turkey alot and I know alot of my friends like it too. They want to put that sound in there cars...but not compressor surge. Im not ruling out surge but i would like to get to the bottom of this. anyone have a external wastegate on the MSP?

 

[t3ase]

the turkey sound is cause by both the placement and the type of bov/bqv. basically what is happening is that the vac. line coming from the manifold into the valve causes it to open and close(yes i know common knowledge), but when the valve opens vac/boost is reduced causing it to close again, and then pressure instantaneously builds up and it opens and closes again. Basically its a rapid open and close caused by slight changes in the manifold pressure/vac line. Since ours only has one source it "cycles" very quickly. For those of you with car knowledge this is the same thign that happens with the thermostats when the temp sensor isnt set correctly. ie the open and close temps are the same instead of having a 5 degree window. Another contributing factor is the low boost at which our cars run..the air doesnt have the force nor the velocity(as force is a function of velocity) to keep the valve open by shear movement. As boost increases it will have more of a whoosh sound caused by the overwhelming force and velocity of the air through the re-circ. valve. it HAS NOTHING to do with neither the s-pipe or the plastic pipes. to get rid of it I would suggest both getting a aftermarket "dual-source" BOV like a hks ssq, or greddy type s and turning up the boost. Personally i like the turkey or Butterfly as we used to call it back in the day...

Um, at 14psi, it has no more of whoosh sound than it did at stock... I know this for a fact.

 

[505zoom]

Um, at 14psi, it has no more of whoosh sound than it did at stock... I know this for a fact.

I totally agree... mine has seen from 6psi-14psi and the sound never changes with boost increase. This is also true with the dual valves. BPV/BOV has the same hiss at 14 that it does at 8... BPV/BPV has the exact same slight gobble at 14 (see attached vid) that it does at 8.

 

[DSMConvert]

yes but you must also change the location of the bov/bpv to connect AFTER the intercooler...the air before the intercooler, where our current piping is, is super hot and when you run super hot air over metal/plastic is creates a pressure different and thus the gobble....if you put the valve, instead on your intake pipe a few inches before your throttle body the air is much cooler and will not produce the pressure difference over the valves...sorry i guess I wasnt clear that it is a combination of events that produce the sound and not just isolating one of those.