There was an in depth one that I can't seem to find anywhere? I've tried searching, maybe I'm just sucking at it. Anyone care to help?

 

no BOV?? in an FD used for anything but drag racing thats gota be a terrible decision right?

 

I remember that thread. I pointed out that the guys turbo was surging. I think if you search my post a few month back you may find it.

but in my opinion BOV is a must.

 

+1, even though the stock location sucks - I relocated mine on the Greddy elbow (thank you David Garfinkle for the beautiful welding)

 

https://www.rx7club.com/3rd-generation-specific-1993-2002-16/about-eliminating-stock-bov-495277/
https://www.rx7club.com/3rd-generation-specific-1993-2002-16/blow-off-vs-bovs-703947/

 

I remember reading some time ago that the best location for a BOV is as close to the intake as possible. I too have the greddy elbow with the BOV on it. I want to upgrade to newer tial style BOV because it's design and function is much superior the older BOVs.

 

That's what I'm doing though.
Thanks Mahjik, but those aren't the threads either. I'll just search some more.

 

What do you expect to gain by not running a BOV? A good quality BOV should not leak at high boost levels.
Let's say you are going down the track @ 30psi and for what ever reason you need to let off wouldn't you want the extra protection of air pressure release?

 

I'm looking for the thread because I'm looking into it. Not because I'm set on it. Woosa.

 

https://www.rx7club.com/single-turbo-rx-7s-23/8-months-counting-no-blowoff-valve-884695/

 

I just found it, I was getting ready to post it. ^That's the one. Thanks though! I've been reading on it for a bit.

 

This is just internet opinion. If you examine the location of factory air bypass valves, there is great variation. Some turbo gas engines don't have air bypass/blowoff/whatever valves at all, mostly 80s ones. Some designs have blowoff valves close to the turbo compressor housings. Both the FD and the FC do that. Some have the blowoff valve literally built into the compressor housing. Borg Warner does that on the the stock turbo on the VW/Audi 2.0 turbo FSI engine:



The Ford 3.5L Ecoboost engine has the blowoff valves before the intercooler.



Many engines do have the factory blowoff valve after the intercooler. Mitsubishi does that on the 3000GT 6G72 and Evo 4G63 engine, shown here:



The Nissan Skyline GT-R RB26DETT and Sylvia SR20DET engines are also like that. On all Subaru engines from the past 10 years the blowoff valve is physically located on the intercooler itself.



So as you can see, blowoff valve location varies greatly depending on whatever goals (noise reduction etc) and constraints (fitment, plumbing, cost) the engineers had.

 

^^^ that's key. Assuming engineers plumb the BOV where they can due to space. Thinking about it on a mechanical stand point it makes much sense to relief pressure closer to the intake.

 

what is the point of not using a bov though? not sure what benefits you would gain, faster spool up between shifts maybe?

 

No risk of failure. It is common practice for modern race cars that are turbocharged to run no bov. This is because when a bov fails it releases all of your boost, aka power. Obviously there is the subjective concern about accelerated turbo wear by running no bov, but this does not apply to every application where cost is less of a factor.