Intercooler - BOV setups

[rid1ridz14]

Hey y'all hope you are doing fine. I have a few questions about the bov location for the 4efte.
Why is the BOV located between the turbo and intercooler on the tmic and not between the intercooler and throttle body?

Also if it's fmic, then where should the bov be?
between intercooler and throttle body (the usual)
OR
between turbo and intercooler?
because I have seen both lol

 

[SKINY]

Mine on the GT with a front mount sits just before the throttle body bud, on the Caldina factory top mount it comes of at the rear of the core and recirculates into the Airbox, my Baileys valve slips onto the factory dump valve pipe also so its coming outa the core into atmosphere

 

[RoyalDutchie]

Closest to the turbo is allegedly the best. Not sure what the science is behind it, but it is suppose to prevent any air going through the turbo when located next to it.

Ones the throttle closes air needs to escape and most will go through the bov but of it is far away most likely some will be vented through te turbo. What difference it makes is probably neglectable and both positions will work fine.

 

[SKINY]

Closest to the turbo is allegedly the best. Not sure what the science is behind it, but it is suppose to prevent any air going through the turbo when located next to it.

Ones the throttle closes air needs to escape and most will go through the bov but of it is far away most likely some will be vented through te turbo. What difference it makes is probably neglectable and both positions will work fine.

Some say that no dump valve will eventually wreck your turbo, some say that it has to go close as possible to the turbo on either side lol
Toyota I think got it right tho, Caldina/gtfours factory recirculates the exact same way as the factory GT/glanza does, back into the intake and sucked back through the turbo
It's an argument as old as time bud

 

[rid1ridz14]

yeah true. i guess it's all about what is more convenient to fit in your situation

 

[rid1ridz14]

Closest to the turbo is allegedly the best. Not sure what the science is behind it, but it is suppose to prevent any air going through the turbo when located next to it.

Ones the throttle closes air needs to escape and most will go through the bov but of it is far away most likely some will be vented through te turbo. What difference it makes is probably neglectable and both positions will work fine.

yes when you look at other performance turbo-ed car, the bov are next to the throttle body, for e.g rb or 1jz/2jz etc etc

 

[H_D]

My bov is located before the throttle body.

 

[rid1ridz14]

that's a nice looking engine bay, well done

 

[SKINY]

That's the exact same place mine is on the GT just remembered the last 6 months or so it was on the road I wasnt running a valve at all

 

[rid1ridz14]

That's the exact same place mine is on the GT just remembered the last 6 months or so it was on the road I wasnt running a valve at all

pure stutututu noise lol, amazing

 

[Jay]

Stock valve is designed to send the already filtered air back through the turbo keeping any contamination inside the engine and reduces noise too.

Because that air is already heated it's better to inject it into the air stream before the intercooler to be cooled again rather than throw it straight into the inlet.

Aftermarket valves vent to atmosphere. Much easier to incorporate them in the pipework of an intercooler setup on the cold side than squeeze them into the shorter hot side but plenty of options use the stock position (Blitz, Sard, ARC, etc).

Jury is out on which is better. You could argue throwing air out of the system is less efficient and also allows unfiltered air the chance to get in.

 

[rid1ridz14]

now that you say that.. I dont have a stock bov, its a fake hks(sadly, bought it like that tho) located in the stock location. But soon I'll be doing a fmic so I might change the bov to a real hks and im already venting to atmosphere.. I only have a vacuum line that goes back into the throttle body


Yeah I guess its 50/50 both have there cons and pros

 

[rid1ridz14]

My bov is located before the throttle body.View attachment 6199View attachment 6199

can you send a pic of your intercooler piping? where and how it's routed.. please

 

[rid1ridz14]

hmm after some researches on google, out of curiosity, how does the stock bov look on the 4efte? and does it vent to atmosphere or recirculates from factory?

 

[SKINY]

It recirculates into the air intake pipe not that far from the turbo bud

 

[rid1ridz14]

hmmm okay thx skiny

 

[Jay]

Stock recirculation valve for reference:



Atmospheric (blow off) valve in stock position with stock TMIC:



In stock position with FMIC:




BOV in cold side on FMIC set up:



And FMIC set up without a BOV:

 

[rid1ridz14]

You found all the possible ways with pictures... You're the goat Jay, thanks a lot for always helping, really appreciate it