Apr recirculation valve or Forge splitter BOV?

[Blitzen]

That is one theory, I dont know if it has been proven or not. What I have noticed is that most tuners use full atmo BOV's. Sure some do it just for the sound but there are plenty out there are more interested in performance than the sound.

Not to discount this, but to add some thought...Some cars run a MAFless tune, so the MAF is removed all together, and the car tuned around this, and other cars also run a MAP (Manifold Absolute Pressure) sensor...This still allows the engine to run freely(albeit with a large loss of power) if you blow a intercooler hose...(as what happens alot on my mates Evo 3...Thank God he has a MAP sensor...It has saved a long walk sometimes...Too much boost).
What I am saying is, cars can be tuned to work around different parameters...If you want a fully atmosphere BOV, your car can be tuned for this...Its up to what you want, what you have money for, and what the negine has.

[Preen59]

Blitzen is correct. The MAF sensor measures the volume of air passing through the intake and therefore the ECU can predict things like ignition and fuel much more easily in a larger variety of conditions.

If you vent to atmosphere, some of this air is lost from the inlet tract and therefore the ECU 'thinks' that the engine is consuming more air in the charge than it actually is, and it can make the engine run rich and idle rough, among other things.

If you want to run an atmosphere vented BOV (You tossers.. ), you need an engine tune adapted to that.

Vent/recirc BOV's can give you a noise with the benefit of most of the air being recirculated, but it's still not ideal.

Make sense?

[mikepologti]

interesting read, i thaught bov's were purly for noise, didnt relise hey offered a performance gain in some engines.

[Blitzen]

interesting read, i thaught bov's were purly for noise, didnt relise hey offered a performance gain in some engines.

All things on an engine serve some kind of purpose toward the performance of the engine/vehicle. The main use for a BOV/DV is to prevent 'Compressor Stall' in the turbo when the throttle butterfly is snapped shut and the compressed charge air has no where else to go except for back down the inlet tract.
The DV/BOV then, operating under manifold vacuum, opens and allows the wasted charge air out, preventing the turbo from slowing down.

[Swatty]

anyone considered this?

http://motorcade.co.za/index.php?main_page=product_info&cPath=137_6_110&products_id=224&zenid=a338fdbf4e294d668e7cdeb9888bdce5

rekon It would work on stock ecu? hehe

[noone]

From my limited knowledge, think the Forge one sounds the part.

The 70 plumback and 30 BOV gives good reliability and I believe can be made to full plumback with the adjustment knob.

Think someone tried to look into a bulkbuy from that company and never got any response.

[Swatty]

LOL Mozzy, I dont think its the WA police thats the issue, i think its the people they pull over.

Ive been pulled in over many occasions and in cars with various states of subtle to highly illegal (and loud) mods, and Ive never had to go over the pits.

I'm quite happy to offer them the respect they deserve, and the situation warrants

Never heard a BOV on the road mozzy, really?

I had a hks ssqv on my silvia and loved it. Hardly made any noise on daily drive except when you are giving it heaps of stick and then it was very loud.

But yeah I agree with gareth, unless the cops are being really picky it's about how you are driving not about your mods. I drove my car for a good 18 months with a bonnet full of illegal sh*t with no permits but I rarely drove like a tool so I whenever I was pulled over they were good about it, didn't even have side indicators or windscreen wipers haha.

That being said I have known people that have been shafted for illegal goodies for only driving 10kms over the limit.

[Blitzen]

anyone considered this?

http://motorcade.co.za/index.php?main_page=product_info&cPath=137_6_110&products_id=224&zenid=a338fdbf4e294d668e7cdeb9888bdce5

rekon It would work on stock ecu? hehe

Yeah, It probably would...My Forge one worked on a stock ECU too.
Now, read the text in both of these ad's, and tell me this hasn't been copy/pasted...

Motorcade...http://motorcade.co.za/index.php?mai...7cdeb9888bdce5
Forge...http://www.forgemotorsport.co.uk/con...duct=FMDVSPLTR

[Swatty]

Yeah, It probably would...My Forge one worked on a stock ECU too.
Now, read the text in both of these ad's, and tell me this hasn't been copy/pasted...

Motorcade...http://motorcade.co.za/index.php?mai...7cdeb9888bdce5
Forge...http://www.forgemotorsport.co.uk/con...duct=FMDVSPLTR

HAHHaHahaha!

people are so lazy.

Funny thing is, they both probably stole it from another website.

[Blitzen]

I'm thinking the Motorcade boys stole the ad, and did a but of reverse engineering on the valve to make their own.... I personally have the Forge BOV and found that it is very well made too.

[Petrina Polo]

I have found the Forge BOV to work quite well...I have had it for 14 months now, and have lubed it once(takes about 15min to do). You are right it that it takes some amount of time to find the sweet spot, but I felt I have found it (36 clicks from the tightest setting). I am however looking at getting a Forge 007P for insurance and roadworthy reasons (if I was to have an accident, and the BOV was found, there is cause there to deny the insurance as a BOV dose make a car unroadworthy...And this isn't just for the sound issue, even though the sound from the Forge BOV isn't that loud(well under the 90db legal limit)...Look it up people...).
The 007P also looks very stock, and this is also what I am looking for.



1) True...

2) Um... What???

B) You have to remember that so long as the engine is running, the turbo is spinning. The movement of the exhaust gas and heat causes the Impeller blades to spin...This in turn is connected by a shaft to a Compressor/Turbine. This compressor is drawing air through the intake to the turbo. This air is then compressed and pushed through the intercooler to the throttle body and to the combustion chamber. It is nearly impossible for air to be lost back through the air intake when the engine is running.

But you cant say its pressurised? the air cleaner cant pressure anything so whats a puff of air gonna do?

[noone]

Can anyone assist me in getting my hands on a Forge Splitter?

[Blitzen]

But you cant say its pressurised? the air cleaner cant pressure anything so whats a puff of air gonna do?

This 'puff of air' from the DV is taken into account by the ECU. If it isn't there, this throws out the volume of air that is measured.
Once air is in the intake duct (lets say the SEAT intake, before your air filter), because the air is contained, it is under some amount of pressure. Even if the turbo wasn't there, the air would still be drawn in by the pistons on there downward cycle(much like when you breath, air is drawn into your lungs by the vacuum created by your diaphragm...). This vacuum is creating an inwards pressure to the duct, filter, and then to the combustion chamber...

Can anyone assist me in getting my hands on a Forge Splitter?

Try Tim at Rennehaus...Thats where I bought mine from...

http://www.vwwatercooled.org.au/newforum/upload/showthread.php?t=19275

Or, buy it direct from the site...

http://www.forgemotorsport.co.uk/content.asp?inc=product&cat=260501&product=FMDVSPLTR

[mozzzy_2000]

Never heard a BOV on the road mozzy, really?

I had a hks ssqv on my silvia and loved it. Hardly made any noise on daily drive except when you are giving it heaps of stick and then it was very loud.

But yeah I agree with gareth, unless the cops are being really picky it's about how you are driving not about your mods. I drove my car for a good 18 months with a bonnet full of illegal sh*t with no permits but I rarely drove like a tool so I whenever I was pulled over they were good about it, didn't even have side indicators or windscreen wipers haha.

That being said I have known people that have been shafted for illegal goodies for only driving 10kms over the limit.

Back when I posted this comment I don't think I had actually really listened out for them but since then I have heard one on a riced up Nissan Skyline that dared to take me on but thats a different story alltogether.

Anyway having run the APR R1 DV for awhile now I can say that is that the performance is beyond what I had imagined. The way it holds boost during shifts and eliminates turbo lag is nothing short of astonishing at times and sometimes borders on lethal. Quite a few times I have entered a corner a wee bit fast and upon changing down gears the boost is still there and you end up pretty much catapulting around the corner when you go to press the acelerator next. Quite hair raising to say the least.

Anyway the other things I like about this DV that is rarely touched upon is the fact you can install it and forgot about it. It requires zero maintenance due to it being diaphragm based and not piston based like the Forge splitter which requires periodically lubing. It is also said that the R1 functions with a faster response time than piston based DVs.

I guess in the end it all depends with what you prefer and what you can afford.