Is there any chance this BOV can work with the stock intake pipe using these 50mm bov adaptors?


i think it can be done. No need to weld it on the UICP. It should be made to fit in the stock location and this way it will clear the hood.

 

It's released. As for how it works with stockish turbos, someone else will have to talk about that. Everyone has to remember this is a 180* inlet/outlet configuration (instead of the 90* of the stocker). Plus the inlet and outlet are the same size (and quite large). It took a good bit of fabricating to get my inlet pipe port in a straight line with the port from the UICP. Plus it's a big piece so fitting all of that into the tight confines wasn't easy.

I just wanted to give everyone a heads up in case they thought it would be a simple modification.

 

i have no idea what those are so i'm going to say no

 

they only started shipping a few months ago.

surging at partial throttle is the turbo, not the BOV

 

thats what all the other BOV companies say

 

perhaps because it's the truth, we might have an understanding about how things work

 

No. It is not. It is a combination of the turbo and the BOV.

The stock BOV works perfectly with the stock turbo. Even the stock turbo will have partial throttle surging issues with many aftermarket BOVs. . .

The stock BOV works perfectly with an FP Green. Even an FP Green will have partial throttle surging issues with many aftermarket BOVs. . .

The stock BOV just can't hold the higher boost that people are running with stock and modified stock turbos. . .

 

reson being the stock bpv is leaking and keeping the turbo out of surge.

 

That is exactly what it should do. Under partial throttle/partial boost the BOV should open slightly to keep the airflow the engine is not using from backing up and causing compressor surge. When you tip on the throttle the BOV closes and resume full boost. On the stock BOV this works perfectly up until 25-30psi, at which point the BOV is blown open a bit causing a loss in ultimate power. . .

The perfect BOV would be one that acts exactly like the stock one, but that doesn't blow open under full boost/full throttle. I have been dealing with this for 4 years, 4 different stock style turbos (VIII, IX, 20G, Green), 6 different BOVs, different types of cams, 4 different tuners. . .

The basic question here is - does your Alpha Q recic. valve surge with the stock EVO turbos?? If so, it's not a problem with the stock OEM turbo. . .

If not - then it is going to be the perfect replacement for people running high boost on the stock turbo. . .

 

probably not, it won't leak at partial throttle.
again, the valve doesn't surge, the turbo surges

which BOV's have you used?

 

Sorry for the improper terminology. I should have said the turbo surging due to insufficient/improper BOV action. . .

I have used the plastic EVO VIII valve, the metal EVO IX valve, Greddy Type-S with dual springs, Greddy Type-S with single spring mod, 2 different Forge units with all different combos of springs and shims, an original Tial 50mm with every spring rate you have available . . .

The next best to the stocker for driveabliity was the Greddy Type S with single spring mod, but it started leaking at 12psi. . .

The next best to the stocker for holding boost was the Tial, but it felt like it would need a lighter spring than your lightest available (7?) in order for it to be able to open a little under partial throttle. . .

It seems it's impossible to get the best of both worlds. . .

 

since the turbo would be going into surge if you didn't have a bov at all (just on throttle surge, not speaking about lift off), you can't blame the bov for doing it's job - which is to stay closed while you are on the gas. The problem is either the turbo, tune or combination of parts on the car (cam, port work, etc) - all a bov is designed to do is release/recirculate air when you take your foot off the gas - nothing else, a good bov will not leak at all


to your edit: we have a -3psi spring for S/C applications...i can send you one in exchange for one of the springs you have now if you wanted to give that a go

 

This is all fine and dandy, but I think the question most are asking is, what is the partial throttle responce like with the tial recirc. valve.

In steady state light boost applications such as a long sweeper in 4th or 5th gear, light throttle modulations will have the BOV rapidly opening and closing, and in some circumstances cause a light "bucking" or "flutter" that can be felt through the chassis.

How seamless is the tial recirc. valve at handling partial throttle responce as outlined above?

 

it would depend on the spring you have, the lighter the spring, the more sensative it's going to be, the stronger the spring, the less sensitive it's going to be...all the road racers i know go with the lightest possible for the quickest reaction.

 

EVOlutionary, you need to try the Dejon Tool leak stop kit. Holy Grail for RR/autox IMO.