Recommend the best BOV for my boost levels.
#44
My local supplier gets better discount for turbosmart than for forge. Anyone see any glaring problems with Turbosmart Vee Port Pro? It sounds ok on youtube...
Vee Port PRO BOVs
Vee Port PRO BOVs
#48
Elite Member
iTrader: (9)
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,898
Total Cats: 399
Kinda sorta related. I have this old FM Bov. Anyone know much about it? It seems to work well for all the different setups I've had on it but I haven't tried anything else and can't tell if it leaks because it's currently in my fender. I prefer little spring pressure so it vents as much as possible therefore open at idle but I run a filter on the open at idle side. Should I buy something new? Am I loosing 100 hp running this?! it's so quiet.
I've taken it apart a few times and rehoned the ID so it still slides smoooooth as butter.
I've taken it apart a few times and rehoned the ID so it still slides smoooooth as butter.
#50
Elite Member
iTrader: (9)
Join Date: Jun 2006
Location: Chesterfield, NJ
Posts: 6,898
Total Cats: 399
It very well could be, I still don't know if it's 'bad' or why. Seems to be fine but I'm missing something, like:
Huh? If you had a maf you'd want that **** closed so you aren't venting the MAF'ed air out.
On our man cars you'd want it open at idle, no? This is why I like my FM with it's filter and why I haven't gone with a tial Q.
On our man cars you'd want it open at idle, no? This is why I like my FM with it's filter and why I haven't gone with a tial Q.
#51
My local supplier gets better discount for turbosmart than for forge. Anyone see any glaring problems with Turbosmart Vee Port Pro? It sounds ok on youtube...
Vee Port PRO BOVs
Vee Port PRO BOVs
#52
So I got my Forge today. STOKED. Put it on. Massive compressor surge.... Opened it up... sent me the yellow spring instead of lighter green one. Ugh. Called. New one is on its way.
This brings me to the question: what spring do you guys use on the idle side, to keep it closed during idle? I have red, yellow, blue, green, and the stock one in it which is very light. Idle did seem to be much different as soon as I installed the new valve over the old China one so I'm assuming its either sealing a lot better or leaking a lot better, but don't know how to test it hahaha.
This brings me to the question: what spring do you guys use on the idle side, to keep it closed during idle? I have red, yellow, blue, green, and the stock one in it which is very light. Idle did seem to be much different as soon as I installed the new valve over the old China one so I'm assuming its either sealing a lot better or leaking a lot better, but don't know how to test it hahaha.
#53
So I got my Forge today. STOKED. Put it on. Massive compressor surge.... Opened it up... sent me the yellow spring instead of lighter green one. Ugh. Called. New one is on its way.
This brings me to the question: what spring do you guys use on the idle side, to keep it closed during idle? I have red, yellow, blue, green, and the stock one in it which is very light. Idle did seem to be much different as soon as I installed the new valve over the old China one so I'm assuming its either sealing a lot better or leaking a lot better, but don't know how to test it hahaha.
This brings me to the question: what spring do you guys use on the idle side, to keep it closed during idle? I have red, yellow, blue, green, and the stock one in it which is very light. Idle did seem to be much different as soon as I installed the new valve over the old China one so I'm assuming its either sealing a lot better or leaking a lot better, but don't know how to test it hahaha.
1-put in softest spring
2-observe if its open at idle
3-replace spring with stiffer one until it doesn't, without making it surge like crazy
4-????
5-Profit
On MS controlled miata's I've actually had much better luck maintaining a rock solid idle with the bov not open at idle. I don't think there's a drastic difference either way, just my preference. I know some people swear by having it closed at idle.
#55
Retired Mech Design Engr
iTrader: (3)
Join Date: Jan 2013
Location: Seneca, SC
Posts: 5,009
Total Cats: 857
you're not venting it out, it goes back to the inlet after the maf and right before the turbo. the stocker actually opens at idle a little too, I think its to keep the car happy and not surging when letting off (that roughness for a split second right after easing off the throttle when the bov goes between open/closed a few times)
TEST:
1-put in softest spring
2-observe if its open at idle
3-replace spring with stiffer one until it doesn't, without making it surge like crazy
4-????
5-Profit
On MS controlled miata's I've actually had much better luck maintaining a rock solid idle with the bov not open at idle. I don't think there's a drastic difference either way, just my preference. I know some people swear by having it closed at idle.
TEST:
1-put in softest spring
2-observe if its open at idle
3-replace spring with stiffer one until it doesn't, without making it surge like crazy
4-????
5-Profit
On MS controlled miata's I've actually had much better luck maintaining a rock solid idle with the bov not open at idle. I don't think there's a drastic difference either way, just my preference. I know some people swear by having it closed at idle.
On my Mitsubishi BOV, open at idle, I put a plastic bag on it at idle and it neither inflated nor pulled into the filter.
AND all of this is occurring upstream of the throttle and AIC valve.
#60
Not AFAIK.
I had that FM valve on my original kit (2002-vintage 2-cat 99 CARB-approved kit w/ Link Piggyback). It's huge, much bigger than the GFB valve that came when I upgraded to the modern FM2 hardware a couple years ago.
The old FM valve was dual port -- if the piston moved a little bit, then it opened the recirculation port (the one with a flange on it), but if it moved a lot then it opened up a second port on the other side that did VTA. It didn't leak through the VTA port at idle, so didn't **** off cars that still had the stock ECU with the MAF hooked up (like with the Link Piggy).
Aside from being huge and comparatively heavy, the main downside was that the recirc port flange was not retained very well and had a tendency to come off. It was basically pressed into the housing with a few punched retaining points around the circumference, but mine kept coming apart. I eventually JB welded it on.
--Ian
I had that FM valve on my original kit (2002-vintage 2-cat 99 CARB-approved kit w/ Link Piggyback). It's huge, much bigger than the GFB valve that came when I upgraded to the modern FM2 hardware a couple years ago.
The old FM valve was dual port -- if the piston moved a little bit, then it opened the recirculation port (the one with a flange on it), but if it moved a lot then it opened up a second port on the other side that did VTA. It didn't leak through the VTA port at idle, so didn't **** off cars that still had the stock ECU with the MAF hooked up (like with the Link Piggy).
Aside from being huge and comparatively heavy, the main downside was that the recirc port flange was not retained very well and had a tendency to come off. It was basically pressed into the housing with a few punched retaining points around the circumference, but mine kept coming apart. I eventually JB welded it on.
--Ian