OK. I did a search, and there is some discussion of this in other threads, but no one seems to know WHY people are switching out the 'stock' bpv (a bosch product) for another bosch product (the 110 sport bpv).

One thread says, "yeah it really pulls...." and a yet another basically said, "I am not sure why I did that".

So my stupid question for the day is: What is the difference between the two?

 

from what i've been told, it allows the boost to come on closer to 3000 r's, instead of the 36-3800 it currently does.
Not having been in a car with one; I can't say if there is anything else to it then that.

 

Hmmm... if true, that would kill fuel efficiency.... which takes a it anyway just by virtue of boosting. Oh well, I suppose it coes with the territory.

 

Actually the reason people change them is the stock unit has a leak issue. I found mine to loose boost in the 3-5K rpm range and once pressure really was starting to build it would finally seal. The sport 110 has a much MUCH stiffer spring and better metal /rubber valve. This allows more boost to be built under heavy or full throttle in the midrange. Also on partial throttle the bpv seals quicker and better which nets a more responsive motor. Very worth while upgrade for not allot of coin. This change out will not however net a peak hp change but I do feel it did net a powerband change especially in the midrange. The stock bypass spring is so mushy and valve assembly so floppy that I was getting allot of flutter in the 3500-4500 rpm range. Was annoying. The 110 cured it.

Last there is no fuel milage change that is noticeable with the bypass change. Since powerband does change and boost is more present under partial throttle there will be a fuel difference but I cannot measure it.

 

Great response desertheat! That makes sense to me... although I am still scratching my head on fuel... The drop I saw once the SC was put on is larger than I thought... I expected 1-3mpg loss as opposed to the 3-5 loss I got on the first tank. Maybe the ecu is still learning....

 

Mabey your foor is a little heavy with the new power

 

I recently replaced my 102 with the 110, and the biggest change I noticed is that the boost stays up longer when I shift so it is much smoother with the way I drive.

Also about the drop in gas milage... the reason is that the A/F ratio is about 11..... when I go to tune mine it will be more in the range of 12.5-13 that will give me more power and better milage. TRD did that as a safety measure.

 

Yes they did. also once in the power up top around 5000-6500 rpm she goes so friggin pig rich it is almost off the scale!

 

Ok... I am going to ask a second stupid question... I thought the ecu reflash was the tune. How can you further tune the ecu without a unichip or other piggyback?

 

it is a "tune" for the new fuel map, but I am going to be tuning it with my emanage ultimate

 

Or u could go with the Forge 007 BPV which is way better than both of the Boschs, but is twice as mush as 110.

The Forge 007 BPV is a real aluminum BPV, not plastic and it has a real piston in side. Not a plastic diaphram. You get three springs you can inter-change for how stiff you want the piston.

Bosch 102 = Free with kit
Bosch 110 = $55 online
Forge 007 = $105 online

You pick

Forge 007 is great though. Alot better than the 110, but the 110 is way better than the 102.

 

where could one purchase the forge 007 bpv?

 

Would putting any of these void the warranty? Would they be able to tell?

 

Look around online.

Ebay has them.

Type it in the search engine as "forge 007 Diverter valve" and something should come up. I tried to find where I got it but couldn't find it. They are like $130-145 on the sites I found. Good luck!

 

they wont be able to tell the difference between the 102 or 110 from looking at it. But the Forge 007 is different. Its bigger, heavier and harder because its aluminum with a real piston in it. Its still black though.

As far as warranty goes, even if you changed nothing completely...Toyota would probably blame you and say you used the wrong gas or something. you know how those ba$tards are.

 

OK... so the Forge is better than the 110 which is better than the 102.

Doing some further reading, I also came across someone who said it does not matter which way it is installed... (a Forge in this case)... in other words backwards or forwards or upside down. That seems counter-intuitive to me. If the bpv is designed to divert boost when your foot comes off, then it seems to me there is only one way to install it... right?

I guess I am just not getting the point of this "upgrade". I'd rather put that money to the TRD sway bar.

 

With the different springs on the forge has anyone tried all three springs? I am interested to know if boost is seen more at the lower rpm's. Also what pulleys are you running and is there a noticeable powerband shift. Thanks.

 

i also want to know if these springs let boost come earlier
thx

 

instead of debating on which one to get, why dont you get a adjustable preload instead of guessing which springs to use.

 

The "Real" forge valves(the reason why I say "Real" is cause half of them on ebay are fake) comes with 4 springs. Green>>Yellow>>Blue>>Red (In order from softest to hardest). I spent a while messing with the spring setups and finally came out to the best setup. I run my diverter valve upsidedown or bacwards you could say with the red spring and a spacer under the spring. That holds the boost the best with my pulley setup, and sounds louder than 90% of turbo BOV's with my K&N short ram intake