Should I Put My Stock Blow Off Valve Back On
05-11-2004 | 10:12 PM
#1
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Should I Put My Stock Blow Off Valve Back On
I want to get my ecu upgraded, so i call Cobb Tuning in Salt Lake City,and Vishnu Tuning in the Bay area. As soon as i told them that i have a blitz blow off valve both of them told me that i should remove it that it will shorten the life of the motor and some other resons. I dont know what to do, i went to the dealer and talked to one of the head mechanics and i dont think he really knew either. does anyone think that they want me to put the stock bov because they program the new ecu to the stock bov.
05-11-2004 | 10:44 PM
#2
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Joined: Oct 2003
Posts: 115
From: Atlanta
Car Info: 2002 WRB WRX
There are a lot of people with BOVs, and knowing that I would say that it wont hurt your car. But I would run a 50/50 BOV and not a 100% atmospherical one.
05-11-2004 | 11:01 PM
#3
If you have a 100% atmospherical BOV, it can hurt your engine. I don't know if your blitz one is 100% atmospheric or 50/50, but you should probably go back to stock regardless. A 100% Atmo is dangerous because the ECU thinks there is air presure ready to use from the turbo, but the BOV will just vent it out to atmosphere. This screws up the A/F ratio in the cylinder, making the mixture really rich, which is what can cause the damage (and backfires and whatnot).
It doesn't have to do with the tune of the ECU either, as it has more to do with where all the sensors are located.
Moreso, there is no performance benefit from having a blowoff valve. Unless you really like the 'woosh' sound, I'd suggest taking it back to stock.
It doesn't have to do with the tune of the ECU either, as it has more to do with where all the sensors are located.
Moreso, there is no performance benefit from having a blowoff valve. Unless you really like the 'woosh' sound, I'd suggest taking it back to stock.
05-12-2004 | 11:28 AM
#4
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Joined: Oct 2003
Posts: 115
From: Atlanta
Car Info: 2002 WRB WRX
Or you could try the worx tuning BOV. It is designed specifically for the WRX and is a great bov. Here are just a few posts on it: http://forums.nasioc.com/forums/sear...der=descending
05-12-2004 | 06:44 PM
#5
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do you know that the HKS super SQV is a 50/50 or a 100% atmosperical one?
05-12-2004 | 07:13 PM
#6
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Joined: Oct 2003
Posts: 115
From: Atlanta
Car Info: 2002 WRB WRX
Yeh, and it is a pull type, instead of a push which makes it not as succeptable to leaks
05-13-2004 | 09:33 PM
#8
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thanks guys
ive decided just to leave my blow off on. i think its 100% atmo. I spent like 300 buck for the part and installation and i love that sound and it gets alot of attention . thank you everyone for your information bye
05-13-2004 | 09:51 PM
#9
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Joined: Oct 2003
Posts: 115
From: Atlanta
Car Info: 2002 WRB WRX
bye
05-16-2004 | 06:55 PM
#10
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Joined: Sep 2003
Posts: 330
From: NJ
Car Info: 2004 Subaru WRX
Originally Posted by nKoan
If you have a 100% atmospherical BOV, it can hurt your engine. I don't know if your blitz one is 100% atmospheric or 50/50, but you should probably go back to stock regardless. A 100% Atmo is dangerous because the ECU thinks there is air presure ready to use from the turbo, but the BOV will just vent it out to atmosphere. This screws up the A/F ratio in the cylinder, making the mixture really rich, which is what can cause the damage (and backfires and whatnot).
It doesn't have to do with the tune of the ECU either, as it has more to do with where all the sensors are located.
Moreso, there is no performance benefit from having a blowoff valve. Unless you really like the 'woosh' sound, I'd suggest taking it back to stock.
It doesn't have to do with the tune of the ECU either, as it has more to do with where all the sensors are located.
Moreso, there is no performance benefit from having a blowoff valve. Unless you really like the 'woosh' sound, I'd suggest taking it back to stock.
why would the ECU "think" there is air pressure ready to use.....???
Shouldn't the computer READ what the car is doing and not GUESS what it mighrt be doing???? Just my 2 cents....
05-16-2004 | 07:51 PM
#11
Simply put, the computer screws up the A/F because the car is tuned for the stock BOV, not an aftermarket one. If you have the stock BOV on, the car does know exactly (no guessing involved) how much air is in the system, but an aftermarket one screws with the sensors that tell the ECU whats going on. Someone who knows more about the ECU sensors will have to chime in, as I don't know preciesly where the aftermarket BOV screws you system up.
Bascially:
100% atmo is bad. Makes your car run too rich.
50/50 is better. You get the cool 'whoosh' sound, and the car doesn't run rich (although it gives you no extra performance).
Stock still is the best, but no cool 'woosh' sound.
Bascially:
100% atmo is bad. Makes your car run too rich.
50/50 is better. You get the cool 'whoosh' sound, and the car doesn't run rich (although it gives you no extra performance).
Stock still is the best, but no cool 'woosh' sound.
Last edited by Nick Koan; 05-16-2004 at 10:19 PM.
05-16-2004 | 09:30 PM
#12
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Joined: Oct 2003
Posts: 115
From: Atlanta
Car Info: 2002 WRB WRX
Why would a 50/50 run rich at idle?
05-16-2004 | 10:26 PM
#14
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Joined: Oct 2003
Posts: 115
From: Atlanta
Car Info: 2002 WRB WRX
No performance gains, but still teh 'woosh'!
05-17-2004 | 06:11 PM
#15
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Joined: Apr 2004
Posts: 26
does anyone know if the greddy type S bov is 50/50? I know there is a way to reroute to the intake..but still not quite sure if its a 50/50. Thx