If I am going BPU, do I need BOV?

Some people use the stock blow of valve at BPU. I don't think there is any hard data out there that absolutely says whether or not the stock BOV is flowing enough when it's working. Common sense tells my the stock BOV was probably designed for the stock boost levels and at 18 psi isn't working as well as an aftermarket. As things go, this can be a pretty cheap mod. I got my Turbo XS for $170. You didn't mention it, but you need some method to increase the boost. Bleeder T's spike bad but cost next to nothing. Manual boost controllers seem to work well and aren't too expensive. Electronic boost controllers work well and can be expensive. You need one of the above before the BOV. I personally like the aftermarket BOV because I can hear it and I know that it's working properly. Couldn't hear the stock BOV on my car although some claim they can.

supra400hptt said:

Some people use the stock blow of valve at BPU. I don't think there is any hard data out there that absolutely says whether or not the stock BOV is flowing enough when it's working. Common sense tells my the stock BOV was probably designed for the stock boost levels and at 18 psi isn't working as well as an aftermarket. As things go, this can be a pretty cheap mod. I got my Turbo XS for $170. You didn't mention it, but you need some method to increase the boost. Bleeder T's spike bad but cost next to nothing. Manual boost controllers seem to work well and aren't too expensive. Electronic boost controllers work well and can be expensive. You need one of the above before the BOV. I personally like the aftermarket BOV because I can hear it and I know that it's working properly. Couldn't hear the stock BOV on my car although some claim they can.

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Agreed. I have stock and apexi together. At bpu an aftermrkt bov is not really needed. Nothing works better at low boost/rpm than stock bov. But at 17 to 19 psi, it's nice to know you have something for insurance

I have T mode now but that increase boost of 2 turbo only. I would prefer to have higher boost level at all rpm. Will manual boost controler make it?

It is not possible to increase the boost of turbo #1. Both turbos share the same wastegate. When turbo #1 hits 9 PSI, it then sends some pressure through the VSV in order to prespool the #2 turbo. When #2 turbo comes on line, both turbos are working together to make your maximum boost. The only way to get both turbos to boost faster is through a True Twin Turbo Conversion. Downside, is that many find it too laggy on the Automatics. I only use this conversion when I'm racing from a roll. Otherwise I keep mine in Sequential the rest of the time.

Peace,
Jesse

Actually, the EBV controls the boost level of the #1 along with the pre-spool of the #2.

Prob. not but it sure does sound cool !