FM's aluminum bypass valve annoying - replacement?
05-09-2008, 07:56 PM
#1
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FM's aluminum bypass valve annoying - replacement?
I have the older one, just a simple piston and it sounds annoyingly loud and gobbles. I've greased the piston with no help. I wonder if it's crappy quality is causing a vacuum leak and contributing to my poor idle?
I'm thinking of going with an inexpensive and quiet Bosch or one of these on BEGi's website http://www.bellengineering.net/Pages...ts_valves.html
Will those be stealthy quiet?
I'm thinking of going with an inexpensive and quiet Bosch or one of these on BEGi's website http://www.bellengineering.net/Pages...ts_valves.html
Will those be stealthy quiet?
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05-09-2008, 08:36 PM
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Boost Pope
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I had the same problem with my first BOV, also one of the FM aluminum piston types.
I replaced it with a Chinese knockoff of a Greddy Type RS from eBay. Quiet-ish, and dead reliable.
The Bosch unit on Bell's website, if recirculated, will be the ultimate in stealth.
I replaced it with a Chinese knockoff of a Greddy Type RS from eBay. Quiet-ish, and dead reliable.
The Bosch unit on Bell's website, if recirculated, will be the ultimate in stealth.
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05-14-2008, 10:13 AM
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This is the one to avoid:
Not sure the whole production history on this unit, but it was being closed out as a DOTD almost exactly two years ago, which is when I bought mine.
My understanding is that the GFB unit they sell now is supposedly pretty reliable, and of course the OEM Mitsu valves they sell are gonna be fine.
Not sure the whole production history on this unit, but it was being closed out as a DOTD almost exactly two years ago, which is when I bought mine.
My understanding is that the GFB unit they sell now is supposedly pretty reliable, and of course the OEM Mitsu valves they sell are gonna be fine.
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05-24-2008, 08:12 AM
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Installed the 3000GT valve last night and love it. Even with an open element filter it's stealthy quiet. Just a muffle sneeze at high RPM shifts.
It's waaay stiffer than the old FM piece.
It's waaay stiffer than the old FM piece.
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06-03-2008, 06:21 PM
#10
Hmmm, I thought that was the "new" one, the one you have pictured there, Joe.
I have the one from before that, similar, it's a piston, with an adjustable preload (yay!). It is a two stage deal, with a recirc for light duty, and a vent-to-atmosphere for hard lifts.
I really love it, actually. It's easy enough to keep quiet, but has a nice sound when you blow some air through it. People who know what it is can't miss it, and people who don't won't notice. It doesn't sound restrictive, and it moves a lot of air.
My guess is the reason it went away was in the earlier kits, the valve was mounted in a different orientation, the vent to atmosphere port basically blowing straight up (huge grease spot under my hood is testament to that). It would jam up with grease, and need regular cleaning/lubing. You could do it by blowing cleaner into the secondary blow off port, but it was easy to blow that cleaner back into your eyes if the motor was running. :-)
Anyway, with the (newly fixed) intake kit, the valve mounts facing down, and I think the contaminants all collect at the bottom and blow out of the system. Maybe that's not what does it, but whatever doe, it hasn't needed cleaning since I put it on the car, compared to every month or so before.
I have the one from before that, similar, it's a piston, with an adjustable preload (yay!). It is a two stage deal, with a recirc for light duty, and a vent-to-atmosphere for hard lifts.
I really love it, actually. It's easy enough to keep quiet, but has a nice sound when you blow some air through it. People who know what it is can't miss it, and people who don't won't notice. It doesn't sound restrictive, and it moves a lot of air.
My guess is the reason it went away was in the earlier kits, the valve was mounted in a different orientation, the vent to atmosphere port basically blowing straight up (huge grease spot under my hood is testament to that). It would jam up with grease, and need regular cleaning/lubing. You could do it by blowing cleaner into the secondary blow off port, but it was easy to blow that cleaner back into your eyes if the motor was running. :-)
Anyway, with the (newly fixed) intake kit, the valve mounts facing down, and I think the contaminants all collect at the bottom and blow out of the system. Maybe that's not what does it, but whatever doe, it hasn't needed cleaning since I put it on the car, compared to every month or so before.
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06-03-2008, 07:24 PM
#11
Boost Pope
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FM's current offering is a valve made by GFB, available in either VTA or recirc. Looks like this:
Here's the mfg homepage: http://www.gofastbits.com/index.php?...ub_option=bovs
They're supposedly pretty good. If nothing else, you gotta love a manufacturer who names one of their products the Bovus Maximus. Still, my $50 (shipped) knock-off Greddy RS has been working nicely for the past 1.5 years.
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