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Old 02-05-2010, 02:15 PM   #21 (permalink)
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Re: What advantage is there to blocking off the surge valve?

To do the bov install with the block-off.. I wouldnt have to deal with any vac lines or anything like that would I?

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Old 02-05-2010, 03:17 PM   #22 (permalink)
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Re: What advantage is there to blocking off the surge valve?

Yah you have to do one vac line then went from the original surge valve to the BOV, pretty easy though, there is one guy on here that lost 5psi after a BOV install and he was able to get it back with the solenoid delete. There is a group buy on the BOV from NeedsWings also, check them out, they are on the vendor list, you'd be number 10 and make it that much cheaper
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Old 02-14-2010, 12:08 PM   #23 (permalink)
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Re: What advantage is there to blocking off the surge valve?

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Originally Posted by RysaMess View Post
On the exhaust depot website, they say on their hardpipe combo that it is good to not block off the original surge valve. So you guys say to block it off and others say not to. I beleive you guys, majority rules I guess.
they have no idea what they are talking about really.. leaving the stock surge valve on while having a BOV installed is the equivalent of having a major boost leak.. My buddy has a nsrt4 that had both the stock surge valve and an aftermarket BOV. With both on he was only holding 8 pounds of boost and peaking at 12ish. after simply removing the surge valve and putting a block of plate on it hes now holding about 13 pounds and peaking around 16-17
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Old 02-14-2010, 02:59 PM   #24 (permalink)
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Re: What advantage is there to blocking off the surge valve?

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they have no idea what they are talking about really.. leaving the stock surge valve on while having a BOV installed is the equivalent of having a major boost leak.. My buddy has a nsrt4 that had both the stock surge valve and an aftermarket BOV. With both on he was only holding 8 pounds of boost and peaking at 12ish. after simply removing the surge valve and putting a block of plate on it hes now holding about 13 pounds and peaking around 16-17
I have helped several of his customers out with sending out BOP for the factory surge valve. You MUST remove the factory surge valve if you plan on running an aftermarket BOV. Why they say to keep the OEM unit on there I have no idea, you get zero benefit from leaving it on there.

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Old 02-15-2010, 02:09 PM   #25 (permalink)
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Re: What advantage is there to blocking off the surge valve?

have to agree, take of the stock one, delete the red wire, cap it, and call it a day. had no problems with boost loss and sounds great.
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Old 03-22-2010, 07:55 PM   #26 (permalink)
 
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Re: What advantage is there to blocking off the surge valve?

So, I know I'm new here, but I think I'm getting a chuckle out of the false information you give people. BOV's are not required on turbo setups. Two BOV's will not do anything different then get rid of the excess pressure quicker.

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Old 03-22-2010, 09:04 PM   #27 (permalink)
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Re: What advantage is there to blocking off the surge valve?

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So, I know I'm new here, but I think I'm getting a chuckle out of the false information you give people. BOV's are not required on turbo setups. Two BOV's will not do anything different then get rid of the excess pressure quicker.
Did you mean to say that they are "NOT" required? In a gas application a BOV is a must due to the surge and possible compressor wheel damage.

Two BOV's will work better but they must be set to release at the same pressures (in stock turbo applications) in order to make them work properly. You don't want to vent the pressure back into the turbo inlet, this will cause issues with flow and cause turbulence (sp).

To much pressure released will also cause turbo lag with smaller turbos, you don't want to release all the pressure/volume or the turbo will have to over spin/work to fill the area that was emptied.

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Old 03-22-2010, 11:36 PM   #28 (permalink)
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Re: What advantage is there to blocking off the surge valve?

Yeah you do need one!!! If you dont have one, and you are in boost and shift the boost level will spike for a moment, and that is when it blows off the excess pressure! If the valve was not there, and you have nothing to release the pressure, it would blow the seals in your intake and then were would you be? You would have major boost leak issues ************.
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Last edited by mouser : 03-23-2010 at 08:59 AM. Reason: unnecessary language
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Old 03-23-2010, 08:18 AM   #29 (permalink)
 
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Re: What advantage is there to blocking off the surge valve?

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Yeah you do need one!!! If you dont have one, and you are in boost and shift the boost level will spike for a moment, and that is when it blows off the excess pressure! If the valve was not there, and you have nothing to release the pressure, it would blow the seals in your intake and then were would you be? You would have major boost leak issues ***********.
Really? I am pretty sure 100% of all diesel trucks every built do not come with a BOV from the factory. I run 60lbs in my truck on a daily basis without a BOV. ***************. And I am also pretty sure there are a lot of factory vehicles that came without a BOV from the factory.


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Old 03-23-2010, 08:58 AM   #30 (permalink)
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Re: What advantage is there to blocking off the surge valve?

Our car REQUIREs a blow-off-valve because it couldn't sustain over boosting which can occur with these engines.

Unlike trucks (or busses), they are not setup for super high boost and they need to evacuate excess boost before they self-destruct.

Over boosting would lean out the fuel and knock the engine to smithereens. Or blow out plastic intake.
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