This is a discussion on "The BIG BOV thread" (Where all bov question threads get merged) within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Originally Posted by Arubiccube again many thanks No problem....
APS makes a Dual Port BOV that both recirculates and vents to atmosphere depending on how much boost you are running. It works awesome and with a short ram intake sounds very nice as well. APS ALL THE WAY!!!
The stock piece is the best one there is.
I' am trying to decide between the Greddy Type RS Blow Off Valve-$190 or the TurboXS Type H-RFL Blow Off Valve-$172.10
Can someone just guide me in the general direction to which one is better.
Both of those are good products when used in the right application...
Past Subies - '11 STI Limited stage 1+ and '04 STi stage 2+
'13 Wrangler Rubicon - custom front bumper w/12k lb winch & off-road lights, skid plates, diff guards, etc.
'04 Porsche 911 Turbo GT2 clone 600 HP/TQ
'77 F-150 heavily modded for off-roading
03 WRB WRX STAGE II
STi COMING SOON
BUGEYE MAFIA #199
LET ME QUOTE THE LATE COLONEL SANDERS " I'M TO DRUNK TO TASTE THIS CHICKEN . . ."
Hey, I never meant any harm... I was responding to a post, and figured the information meatn more than the vernacular, and now feel kinda dumb for having touched the keyboard. At any rate, the car is on a lift, my mechanic baffled as to why I have turbo spindle chatter, while the car was a lease-to-own which apparently underwent extensive mods, with a 5" pipe off of a stock turbo... which is why he is scratching his head. All the seals are new, so is all the tubing... "Oh, it had to have had a bigger turbo... and ..." ... He is still confused as to why the car has all this crazy stuff, and a stock turbo. The intercooler almost hits the hood on both sides it is so wide. It looks like someone stuck an FMIC under the scoop. At any rate, I have the stock turbo and BPV with spankin' new hardware and seals... SO he is going to find me a ball bearing turbo and mount kit, and we are searching for a BOV/BPV, installation requirements are not an issue. I basically wanted to know what the ultimate end to the argument is... what is the best EJ20 BOV/BPV, and why?
I can't see how there are hundreds if not thousands of posts on a sunject with no real right answer, but wow!, is everyone opinionated about what IS best!!
Bottom line is, a non-stock BPV is absolutely moot, on anything under 20psi, with exception to something like a billet unit.. More just for accuracy/speed.
Over that pressure/volume, you'd need to look into going bigger.
BOVs on non-speed density (NSD) EMS' cause a ton of issues, which has been stated at least 690 times (thread page length)..
Not to say they cant be used in NSD setups, but they cause more problems than they help..
That's not an opinion, that's experience.
'96 Dodge 2500 CTD @ 40psi - over 700 lb/ft TQ, 7" stack, and 5speed! - SOLD
'01 Dodge 2500 CTD 6-holed hand-shaker - 3850# dual disk
'97 Dodge 3500 CTD DUALLY built Auto - 40psi boosties
BOV FAQ: The REAL dirt on BOVs. Ups AND downs. Lets dispell some myths. - NASIOC
Blow-Off Valve Info
Blowoff valve - Wikipedia, the free encyclopedia
Basically any valve not stock will require initial setup and tuning.Also any valve not 100% fully recirculating will require cleaning/rebuilding at some point as it is not sealed to the elements (sand/dirt).Thats whats great about the stock valve.Requires no tuning and is 100% sealed from outside debris.Not saying there are not better,more functional designs out there.The stock on does have it's issues but setting up/tuning an aftermarket VTA BOV is harder than most people think depending on the model and your knowledge level.
Last edited by Donkey; 01-06-2009 at 11:51 AM.