Compressor Surge...IC Pipes or Bad BOV??

The Reaper

Single, and lovin' it!!
Jan 10, 2006
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Florida
alright i just recently picked up a T'netics 60-1 with a custom cast exhaust housing to bolt onto the stock mani.

After the install my BOV doesn't work (vac lines and everything are fine believe me) but the turbo has a 2.5 in. outlet and im on stock IC pipes (yes i know i need to upgrade them but i can only do a little at a time) right now i have the porsche bosch BOV and then i tried the higher grade bosch porsche BOV, and neither one of them work......

i can be in 5 in. vac. and the bitch will surge like a mo fugga. so out of 2 BOV's both will surge.

so Tissimo (on SF) and i narrowed it down to either the BOV isn't big enough for the air flow/volume, or the IC pipes are just restrictive and causing it to surge.

What are your thoughts on this guys????

thanks for the help in advance.
 

The Reaper

Single, and lovin' it!!
Jan 10, 2006
1,909
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Florida
thats what we were thinking but people on SF are saying its the BOV or vaccum source to the BOV but it has PLENTY of vaccum
 

Joel W.

Just A Jedi
Nov 7, 2005
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Washington
Even if you had both BOV's installed, the air still has to get crammed into the 2" pipe then forced through the 2" intercooler, and back into 2" pipes up to the intake before the air can even see the BOV's...

That is 11 feet +- of restrictions including the intercooler..:)
 

Joel W.

Just A Jedi
Nov 7, 2005
1,561
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Washington
It makes sense when you break it into square inches...
2.5 x 3.14 = 7.85sq inches
2.0 x 3.14 = 6.28sq inches

That is an extra 1.57sq inches of air that has no where else to go except back out through the turbo..
 

Joel W.

Just A Jedi
Nov 7, 2005
1,561
0
0
Washington
^^^ Wow I suck at math... Let me correct this..
It is radius, not diameter x 3.14 to get sq inches.. :slap:

It would actually be:

1.25 x 3.14 = 3.925 sq inches
1.00 x 3.14 = 3.140 sq inches

So there would actually be .785 sq inches of air that gets forced back out the turbo...

My bad...:(