freshs2k, does your BOV behave like one on a turbo setup? in other words, you get that "psthhhh" sound when you lift off the gas or push in the clutch? also, do you have a BOV instead of a bypass valve?

 

Mine does make the pshhh sound when you shift. Behaves almost like a turbo setup. Except its constantly leaking when the throttle plate is shut @ any rpm. I do have an BOV not a bypass. @ idle it sounds like a soft whistle.

 

fresh, in my original post, i asked if it's possible to run a smaller pulley to make boost earlier but also use a BOV to control the max boost. what do you think? can you run a 10 psi pulley to make boost sooner, but use a BOV to control max boost at 7 psi for example?

my understanding is that a BOV is activated by the vacuum line? when the throttle is closed, the intake manifold is in vacuum, and that activates the BOV right? if that's the case, then i don't know how a BOV can word under WOT.

 

I always wondered how the blow off valve works but I think your question has answered my question. (key word i think ) lol by going WOT, the throttle body is fully open and therefore all the boost from the S/C enters the manifold, therefore the vacuum goes away, and the bov closes.

 

PS, I guess someone can design something that will leak off boost at the higher rpms to limit the ammount of psi that enters the engine.. I don't think a blow off valve can accurately do this though.. and even if you can, you might have to make another device to simulate "vacuum" to activate the bov while the manifold is under boost.... or, maybe some type of solenoid that can open at a preset psi and leak off the excess boost? too complicated for me, probably not worth the hassle.. i'd recommend to just get some gears if you want some power down low..

 

gears don't give you more power, they give you mechanical advantage in the form of effective torque. you give up some top end speed for that. and although the ap1 S is drag limited to the mid 150's, it's geared for 170+, and with the assistance of FI, it should be able to get up in the 160's if not higher. i'm actually working on some simulations with gears and maybe a ctsc, but that should probably go in "s2000 talk".

 

I really like this idea and no one has said that it's not possible yet. Your head is in the right place for trying something new. I would get a wastegate and put that puppie on there. Dyno it starting slow, and work a little at a time check to see if the pressure stays consistant.

Good luck!

 

Using a bov to leak the 3 psi from 10 to 7psi at redline would be difficult I just don't think it would be consistent/accurate you'd have to leak boost elsewhere than the bov or how would you measure how much boost your letting out if it vents to the atmosphere.

 

turbo wastegates bypass exhaust gas. is there an equivalent for intake?

 

I think a roots type SC would be beneficial for the S2000 but I think the research & development of the kit was too much to produce one.