Block Off Plate

[StellarSupra270]

So what happens if I don't have a block off plate and I turn my boost up higher than 18psi? Is it crucial to have one? Why do they make one if you don't need it!!!!!????

[Turbodog97]

Well most suggest to swap out the stock surge valve with a bop and bov around 18psi+ because they tend to leak(the diaphragm). Before I went big turbo I used the stock surge valve for 22-23psi applications and I think it held just fine(think being the operative word). Remember if you remove the stock surge valve and put on a block of plate then you also need a decent(non-ebay) bov and cold side pipe to put it on. If you do get a bop make sure you get a good brand like agp or ptp because the knockoff's tend to be warped a leak around the edges(ask me how I know...).

[blksrt4_2005]

how do you know???lol

[Turbodog97]

Mine looked perfectly flat on a table or the ground but when put on my stocker I couldn't hold more than 9-10psi to redline. My cheap-o bop had a bigger gap in it than pam andersons left and right legs.