Hard Pipes with bov?
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Joined: Aug 2006
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RE: Hard Pipes with bov?
O.K, I'm a little confused here. What else is new huh ? Exhaust Depot has posted the following 2 posts on the "other" forum and is recommending using the stock surge valve in conjunction with an aftermarket BOV. The stock "surge valve" is what we all had before we put the famous "Blue Plate" on it or a block off plate with a new aftermarket BOV. His reasoning makes sense to me I guess. I'm not running anything more that 17-18 lbs of boost.
So what do you all make of this ?
Exhaust Depot post 1,
I managed to get the HKS BOV installed. Sounds pretty wicked.
I noticed a quicker recovery of the turbo when I would shift pretty quick.
For those who don't know, the purpose of teh blow off valve is to vent pressure. The turbo spools at about 100,000 rpm when worked hard. When you shift, your thottle closes and then the air has no where to go, so it backs up on the turbo causing a surge.
What the stock surge valve does is that it opens when your throttle closes and vents the air back into the inlet of the turbo, this prevents the turbo from slowing down some. The blow off valve does the same, except that it vents it into the air giving you that Pssshh sound. It also can hold higher boost levels with out leaking and can also vent out more volume. I suggest you use one in conjunction with your factory one. The factory one does not really need to be replaced unless you go with high PSI which will cause the stock one to leak(im yet to check whenit leaks). You cant spit out to much pressure from the stock turbo persay with out hitting fuel cut.
Exhaust depot post 2,
For the newbies, read my first post up top first or you will be lost reading this.
At 11psi I dont notice a difference with the BOV I have. But when I raised the boost to 15psi, I did notice a difference with the recovery. The turbo came online sooner than with just the stock surge valve in place. And this is my reasoning as to why:
The stock surge valve is located on the compressor housing of the turbo. When it opens up, it recirculates the air that is in the compressor discharge into the compressor inlet. The air that is foward of the turbo, hits the throttle plate then bounces and comes back. Now when the throttle opens and the turbo is pumping air back into the plumbing, it has to overcome the air that bounced off the throttle plate. So this slows down the turbo to a certain degree. The air in the intercooler piping is traveling well over 300mph at high boost. So imagine what that air does when it hits a brick wall in front of it. It only has one place to go.
Now, with the addition of a second BOV , you now get rid of all the air that is located between the turbo and the inlet of the FMIC (front mount intercooler) which is the longest section of piping in the system.
I have used various BOV before. I am very happy with the HKSSBOV because unlike the BLITZ and most of the others out there, it does not have a piston inside of it. I have had problems with pistons wearing out on me and sticking.
I tested most of the BOV out there on my mkiv supra. Most of the supra guys use the HKS unit. THey utilize two of them though for those pushing alot of horse power. Some with large single turbo setups, use teh HKS racing BOV which can handle more pressure than the SSBOV. They also use the turbonetics Godzilla one, but those are the guys who have strickly race cars in tube chassies.
So what do you all make of this ?
Exhaust Depot post 1,
I managed to get the HKS BOV installed. Sounds pretty wicked.
I noticed a quicker recovery of the turbo when I would shift pretty quick.
For those who don't know, the purpose of teh blow off valve is to vent pressure. The turbo spools at about 100,000 rpm when worked hard. When you shift, your thottle closes and then the air has no where to go, so it backs up on the turbo causing a surge.
What the stock surge valve does is that it opens when your throttle closes and vents the air back into the inlet of the turbo, this prevents the turbo from slowing down some. The blow off valve does the same, except that it vents it into the air giving you that Pssshh sound. It also can hold higher boost levels with out leaking and can also vent out more volume. I suggest you use one in conjunction with your factory one. The factory one does not really need to be replaced unless you go with high PSI which will cause the stock one to leak(im yet to check whenit leaks). You cant spit out to much pressure from the stock turbo persay with out hitting fuel cut.
Exhaust depot post 2,
For the newbies, read my first post up top first or you will be lost reading this.
At 11psi I dont notice a difference with the BOV I have. But when I raised the boost to 15psi, I did notice a difference with the recovery. The turbo came online sooner than with just the stock surge valve in place. And this is my reasoning as to why:
The stock surge valve is located on the compressor housing of the turbo. When it opens up, it recirculates the air that is in the compressor discharge into the compressor inlet. The air that is foward of the turbo, hits the throttle plate then bounces and comes back. Now when the throttle opens and the turbo is pumping air back into the plumbing, it has to overcome the air that bounced off the throttle plate. So this slows down the turbo to a certain degree. The air in the intercooler piping is traveling well over 300mph at high boost. So imagine what that air does when it hits a brick wall in front of it. It only has one place to go.
Now, with the addition of a second BOV , you now get rid of all the air that is located between the turbo and the inlet of the FMIC (front mount intercooler) which is the longest section of piping in the system.
I have used various BOV before. I am very happy with the HKSSBOV because unlike the BLITZ and most of the others out there, it does not have a piston inside of it. I have had problems with pistons wearing out on me and sticking.
I tested most of the BOV out there on my mkiv supra. Most of the supra guys use the HKS unit. THey utilize two of them though for those pushing alot of horse power. Some with large single turbo setups, use teh HKS racing BOV which can handle more pressure than the SSBOV. They also use the turbonetics Godzilla one, but those are the guys who have strickly race cars in tube chassies.
Professional
Joined: Jun 2006
Posts: 174
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From: New Jersey
RE: Hard Pipes with bov?
Don't listen to that reply from Exhaust Depot. Hector was smoking crack when he made that. I told him so myself 
Sorry the late reply winniep, your looking at about 3-4 week wait but your probably better off taking it in to a local powdercoater if you have one available.
Sorry the late reply winniep, your looking at about 3-4 week wait but your probably better off taking it in to a local powdercoater if you have one available.
