Best Blow-Off Valve For Daihatsu?

[Dougster]

...

BOV sifu's....hahaha...

 

[VF10]

dougster... don't laaa... hehehe if my brother in law reads this thread he'll laugh to death lor... hehehe

 

[Dougster]

...

haha..

WHy? ur brother in law is a BOV god ar?

let him laugh lar...laughter is good for health dont u know? hahaha..

U laugh too much then u'll need a blow off valve for urself....

u'd be like "hAHahahahahha..kepiiish....AHahahahahaha.....kepiiissshh...."

 

[turbonetics]

tezt: yeah....rev till the bov release the presure then if ur rpm drop till wanna die off...means the tension not hard enough

 

[Speed Demon]

The BOV should be installed just before the throttle body. I can't explain that well so let me copy & paste some info I've gotten from a website:

Why vent the pressure ?[SIZE=-1]
[/SIZE][SIZE=-1]Primary reason is to reduce strain on the compressor turbine wheel due to compressor surge. Between shifts, or sudden throttle lift-off, the turbine is still spinning very fast (but slowing) and pumping air at the closed throttle plate, as well as placing strain on the intercooler, hoses and fittings. A BOV keeps air from flowing backwards over the compressor wheel, allowing the turbine to continue spinning freely. When back on the throttle, boost pressure quickly rises again with little lag. A suitable valve location is just before the throttle plate.[/SIZE]

On your question of tuning a BOV, let me insert a document and pics I got off the Internet quite sometime ago which helped me decide to get the Greddy BOV:

Q: How does the Greddy valve work?
A: The Greddy valve has a rubber diaphragm, steel valve and vacuum assisted movement. The boost valve that is normally closed is held shut via spring tension at the top of the valve. A rubber ring at the bottom of the valve flange helps prevent boost leakage. A screw/nut at the top of the bov adjusts the tension of the spring and thus the sealing power of the valve. Normally under boost, the boost pressure on the top nipple helps keep the valve shut along with spring tension against the boost that is underneath the valve. When the throttle plate is closed, your manifold now has vacuum in it while the intercooler pipes are still pressurized. The vacuum, when transmitted to the BOV, helps assist in bringing the valve up, while the escaping boost pressure pushes further to fight its way out. The higher the vacuum level and the higher the boost, the more the valve will move up. Once the boost is evacuated, the spring tension will push the valve shut.
Q: What is the 2nd bottom port for?
A: The 2nd port can be used to help lift up the diaphragm under low vacuum conditions. If you are experiencing surge before your pressure release, hook up the 2nd port to your turbo pressure line. The vaccum at the top of the diaphragm and the boost pressure under the diaphragm will help it open faster. Keep in mind that the valve will not stay open as long using this method, so the sound will not be as loud.
Q: How do you adjust the Greddy BOV?
A: The BOV has an adjusting screw on the top. Use a 10MM wrench to loosen the nut that keeps the screw in place. Then use a 3MM allen key to turn the screw back and forth. Tighten the 10MM nut (snug but not too tight) when you are finished. First, do a rev test with the BOV if you will vent to air. After a few aggressive revs, the valve should close quickly on it's own power. If it does not close or takes too long, then the valve is set too softly. Then do a test drive to listen and be sure that you are getting proper pressure release. If you boost highly, you may want to consider a Type R Greddy instead.
Sorry, pics are too large to attach but I think the description is good enough. Hope this helps.

 

[Fluffy]

VF10's bov is before the IC.is that still okay? :P

 

[teztozterone]

Wow! Nice piece of info bros! Especially speed demon. Very intricate research

made on your greddy BOV!

To all sifus,

Since your all here, mind explaining the use of a dump pipe? ( The other extension

from the turbine unit, right next to the exhaust )... I heard it releases more hot

air???

Thanks all experts,
Tezt.

 

[VF10]

waaa... new info for me too la. very informative laa this speeddemon guy..

to Fluffy, i installed the BOV b4 IC bcos i want it loud lor... most of L2 users install it that way. try find a space before the throttle body? no space right? the only space to install it is either the at by-pass part (which most the us put a stopper there) or before the IC/ after turbo... i see that L5 turbo oso put the stock by-pass before the IC..correct me if i'm wrong..

starler 2E or 4E users oso face the same problem with L2/ L5 users... normally they install the BOV right after turbo/ before IC... BUT>.. if u upgrade to FMIC... the theory that speeddemon suggest could be an option... this is just my opinion on L2/L5 engine lor... i'm not condemning what speeddemon just said... hehehe...

waaa,,, gud forum laa.