BOV Pressure Testing: HKS, Forge, Stock
Mar 15, 2006, 08:56 PM
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BOV Pressure Testing: HKS, Forge, Stock
Out of curiosity, I decided to make a pressure tester to see how much pressure each of the blow off valves I own could hold before it leaks.
Stock Valve: It held to about 10psi and started leaking. It was a really slow leak though.
Forge RS: With it screwed all the way in, it held 38psi. The only problem I had w/ it was w/ the connection to the stock hose. I had to really crank the clamp down in order to not have it leak. I didn't have this problem w/ the other valves.
HKS SSQV: This bad boy can hold whatever you can throw at it. Of course, the design of it is the main reason. I had it cranked up to 60psi w/ no leaks
. This is my project BOV. I think I have found the issues it seems to have on our EVO's w/ the recirculation kit. I am going to do some more testing on it. I like the design of this BOV, I just need to work on the driveability portion of it.
This weekend I will be testing my older Forge DV w/ the green, yellow, blue, and red springs. Should be fun
.
Stock Valve: It held to about 10psi and started leaking. It was a really slow leak though.
Forge RS: With it screwed all the way in, it held 38psi. The only problem I had w/ it was w/ the connection to the stock hose. I had to really crank the clamp down in order to not have it leak. I didn't have this problem w/ the other valves.
HKS SSQV: This bad boy can hold whatever you can throw at it. Of course, the design of it is the main reason. I had it cranked up to 60psi w/ no leaks
. This is my project BOV. I think I have found the issues it seems to have on our EVO's w/ the recirculation kit. I am going to do some more testing on it. I like the design of this BOV, I just need to work on the driveability portion of it.This weekend I will be testing my older Forge DV w/ the green, yellow, blue, and red springs. Should be fun
.
Mar 15, 2006, 10:00 PM
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/\ Hahah... Hey let me know how it goes with the different colored springs of the Forge DV. BTW, Warrtalon, would you happen to know what each color holds up to? 
Mar 15, 2006, 10:02 PM
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Originally Posted by jj_008
Out of curiosity, I decided to make a pressure tester to see how much pressure each of the blow off valves I own could hold before it leaks.
Stock Valve: It held to about 10psi and started leaking. It was a really slow leak though.
Forge RS: With it screwed all the way in, it held 38psi. The only problem I had w/ it was w/ the connection to the stock hose. I had to really crank the clamp down in order to not have it leak. I didn't have this problem w/ the other valves.
HKS SSQV: This bad boy can hold whatever you can throw at it. Of course, the design of it is the main reason. I had it cranked up to 60psi w/ no leaks. This is my project BOV. I think I have found the issues it seems to have on our EVO's w/ the recirculation kit. I am going to do some more testing on it. I like the design of this BOV, I just need to work on the driveability portion of it.
This weekend I will be testing my older Forge DV w/ the green, yellow, blue, and red springs. Should be fun .
Stock Valve: It held to about 10psi and started leaking. It was a really slow leak though.
Forge RS: With it screwed all the way in, it held 38psi. The only problem I had w/ it was w/ the connection to the stock hose. I had to really crank the clamp down in order to not have it leak. I didn't have this problem w/ the other valves.
HKS SSQV: This bad boy can hold whatever you can throw at it. Of course, the design of it is the main reason. I had it cranked up to 60psi w/ no leaks
. This is my project BOV. I think I have found the issues it seems to have on our EVO's w/ the recirculation kit. I am going to do some more testing on it. I like the design of this BOV, I just need to work on the driveability portion of it.This weekend I will be testing my older Forge DV w/ the green, yellow, blue, and red springs. Should be fun
.
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Mar 16, 2006, 06:59 AM
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Originally Posted by Warrtalon
I doubt he just has every random BOV sitting around...
Mar 16, 2006, 07:04 AM
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Originally Posted by WannaRace
/\ Hahah... Hey let me know how it goes with the different colored springs of the Forge DV. BTW, Warrtalon, would you happen to know what each color holds up to?
.
Last edited by jj_008; Mar 16, 2006 at 07:16 AM.
Mar 16, 2006, 07:07 AM
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Originally Posted by jj_008
The order of spring stiffness is the following (with estimated psi): Green (18psi), yellow (23psi), blue (28psi), red (40psi). I will see how close my estimates are this weekend. I won't be using the shims. That would take forever .
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Mar 16, 2006, 07:10 AM
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Originally Posted by TURBODAWG
Did you try the Forge RS bov at less than full preload on the spring? It seems to hold good at less than full preload also.
Brian
Brian
Mar 16, 2006, 07:12 AM
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Originally Posted by Mike@Forge
Those numbers are pretty close, HOWEVER, it should be understood that those PSI ratings for our standard valve springs are not that of the spring pressures alone. Those PSI ratings will also take into account the pressure reference to the top of the valve adding force holding the valve shut which is what the valve will see under normal operation (with no leaks anywhere else in the system). The spring pressures alone are less than those figures.
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Mar 16, 2006, 07:15 AM
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Originally Posted by jj_008
The pressure numbers I quoted are w/ the top port hose connected. I would like to think nobody runs a BOV w/o the top port connected .
.