Blow off valves
#1
Blow off valves
Does anyone know of a good not hugely noisey blow off valve, im pushing just a bit over 420 horse at the flywheel and it was recommended to me to go with an aftermarket BOV for sound and safty. Does anyone have them and how do they like them. Thanks for the replies.
#2
Originally Posted by Goofyz
Does anyone know of a good not hugely noisey blow off valve, im pushing just a bit over 420 horse at the flywheel and it was recommended to me to go with an aftermarket BOV for sound and safty. Does anyone have them and how do they like them. Thanks for the replies.
#3
In my opinion i have heard the Apex Twin Chaimber BOV's and they sound really good and you can adjust the sound to how much boost ya pushin, also if not those the get the HKS SSq bov ya can get universals for 3 something or get the kit for the car for bout 5 im getting the apex in a couple of months after i get my car outa the shop.
#5
recirculate <--- stock BOV are great for stock 300zx twin turbo but when u have upgraded its best to upgrade to a same type but newrer model ... if i were u i would try ( HKS ) BLOV but trys these if price is a issue http://cgi.ebay.com/ebaymotors/90-96...37906777QQrdZ1
HKS ? http://cgi.ebay.com/ebaymotors/HKS-S...38304776QQrdZ1
WOW !!! u get free HKS stickers WOW !! :-)
HKS ? http://cgi.ebay.com/ebaymotors/HKS-S...38304776QQrdZ1
WOW !!! u get free HKS stickers WOW !! :-)
#6
from what i understand
aftermarket BOVs DO actually put the recirc into the intake again... the advantage to them is you can set them for higher pressure than stock so you don't waste your boost pressure . ( i am already using a Boost regulator and larger turbos) i am mainly into preserving turbo life and as it was explained to me without the proper BOVs you get a nasty backpressure spike that can over time weaken and deform the blades on the turbo. I just don't know which ones are annoyingly loud and which ones are tried and tested, since they seem to be rather expensive id like to hear some opinions before going back on a Ramen noodle diet.
if you don't beleive me about the BOVs recirc take a look at importsextreme.com and look at pictures of his car under the hood, they are set up right on each of the intake pipes.
thanks for the post on the Greedy BOVs, i also saw the apexi ones for sale for 164$ each...now all i have to do is find someone who has one of each and listen to them i guess.
The Quest continues!
if you don't beleive me about the BOVs recirc take a look at importsextreme.com and look at pictures of his car under the hood, they are set up right on each of the intake pipes.
thanks for the post on the Greedy BOVs, i also saw the apexi ones for sale for 164$ each...now all i have to do is find someone who has one of each and listen to them i guess.
The Quest continues!
Last edited by Goofyz; 02-13-2006 at 05:34 PM.
#8
HKS Super Sequential... it's the ONLY blow off valve that never needs adjustment and cannot (by design) leak.
For what it's worth, you're going to be doing it pretty much purely as a cosmetic-type mod. There are plenty of higher-horsepower Z32's (like mine) that run stock recirculation valves with no trouble.
However, I only run stock recirculation valves because my SSQV's were stolen.
One of the advantages of the SSQV is that it has an adapter (sold seperately) that you can fit onto the opening to turn it into a recirculation valve.
Three different fins available for different sounds too, and none of them are that loud (I loved mine... I admit it).
Yes, the high price is worth it, if you really want a blow off valve. But it also really isn't necessary.
For what it's worth, you're going to be doing it pretty much purely as a cosmetic-type mod. There are plenty of higher-horsepower Z32's (like mine) that run stock recirculation valves with no trouble.
However, I only run stock recirculation valves because my SSQV's were stolen.
One of the advantages of the SSQV is that it has an adapter (sold seperately) that you can fit onto the opening to turn it into a recirculation valve.
Three different fins available for different sounds too, and none of them are that loud (I loved mine... I admit it).
Yes, the high price is worth it, if you really want a blow off valve. But it also really isn't necessary.
#9
Originally Posted by Goofyz
if you don't beleive me about the BOVs recirc take a look at importsextreme.com and look at pictures of his car under the hood, they are set up right on each of the intake pipes.
http://www.importsextreme.com/
#12
Originally Posted by Goofyz
aftermarket BOVs DO actually put the recirc into the intake again... the advantage to them is you can set them for higher pressure than stock so you don't waste your boost pressure . ( i am already using a Boost regulator and larger turbos) i am mainly into preserving turbo life and as it was explained to me without the proper BOVs you get a nasty backpressure spike that can over time weaken and deform the blades on the turbo. I just don't know which ones are annoyingly loud and which ones are tried and tested, since they seem to be rather expensive id like to hear some opinions before going back on a Ramen noodle diet.
if you don't beleive me about the BOVs recirc take a look at importsextreme.com and look at pictures of his car under the hood, they are set up right on each of the intake pipes.
if you don't beleive me about the BOVs recirc take a look at importsextreme.com and look at pictures of his car under the hood, they are set up right on each of the intake pipes.
#13
Aftermarket BOV's do not recirc.. I have the Blitz BOVs, they came with the car. But, many BOVs do have adapters that will recirculate into the intake. I would say that it's all in what you like. My Z has the recirc's still in, with the Blitz BOV. Since i'm running the Dual POP charger, JWT makes it necessary to have them for the low speed drivability. Now why Stillen had the BOVs installed, beats me
#14
The recirculation serves a performance purpose (among other things)and it is to keep the turbo spinning. When the valve sends that air back rushing into the intake plumbing ahead of the turbo its going to rush through the compressor and keep that wheels spinning between shifts which keeps the car on boost. When you vent to atmosphere you stall the compressor wheel every time and drop back down to 0 boost between shifts. On a drag car this isn't a big deal caue you spend so much time at high RPMS that the you can sustain a decent amount of boost without the aid of a recirc. But on a street car where you're shifting at reasonable RPS's that recirc. really helps. So if you do decide to go with a BOV it would be a good idea to get an adapter to hook up a recir. pipe/hose.
#15
Originally Posted by jmw.81
When you vent to atmosphere you stall the compressor wheel every time and drop back down to 0 boost between shifts
#16
thanks for all the info guys
good stuff to know, upon futher reading on the subject the recirc valves do just about the same job as the Blow off valves, releive excess pressure during shifts and decelleration. the BOV vents it to atmo and the recirc dumps it in the intake. Im pretty sure the BOV opens and closes at certian pressures and from what i read about them you can set that threshold making them slightly more tunable than standard recirc valves. Plus they do make a pretty neat sound. i heard the HKS ones if anyone has seen the short movie "Gettaway in Stockholm 2" they can get a good idea of what they sound like. Its a 20min long flick of a exhibition race between a modded late model supra turbo and a Cosworth. pretty interesting.
#17
You can also hear them pretty good in the new Maxima commercial but I'm not sure why they used the sound of a turbo car in a Maxima commercial. Anyone else catch that?
Rod.
Rod.
#18
Originally Posted by NismoPick
Not entirely correct... When you let off the THROTTLE it will go to 0+ boost (actually vacuum) no matter what. And the BOV keeps the compressor from stalling even if it vents to the atmosphere... THAT'S IT'S ENTIRE JOB. True, if recirc, it will keep it spinning faster, but only a small amount.
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