GoFastBits (GFB) Atmospheric Blow Off Valve (BOV)

[killjoy]

If there is, it should be minimal to non-existent because the whole point is to vent it out of the turbo and into open air. However, I know most have just installed them out of the box. If you read above and on the GFB website, the coin slot on top adjusts "how much" to vent out. You can play with this to control how much noise (and volume of air) you want vented out. Perhaps they are all shipping with different setting when assembled? Very possible given this is a feature that can be leveraged by anyone and the expectation by GFB is that each purchaser will tweak.

When I contacted Greg about the slot he provided me with this info and a link as well


From Greg .
There should be a guide on the GFB website for setting it properly but when you tighten that it increased spring preload which can be needed for higher boost level engines or loosen it to decrease for lower boost level. If you tighten it too much you can get "boost creep" issues etc.

 

[Lotus F1]

Funny I hate the turkey flutter and love the ptttsh lol btw it's my understanding that the flutter is not a good thing. That's backpressure into the compressor. It's not ideal but complies with emissions req. and lowers the sound

 

[F1 SML8R]

Funny I hate the turkey flutter and love the ptttsh lol btw it's my understanding that the flutter is not a good thing. That's backpressure into the compressor. It's not ideal but complies with emissions req. and lowers the sound

This. Several people have alluded to this change over the years as being completely emissions related and not performance/engine efficiency related.

 

[Kaz]

I'm a bit sad to say, to me, it gets rid of the turbo flutter. Or it overwhelms it to the point that I personally cannot hear it anymore. I think the flutter noise (which may not be as productive) is a lot more pleasing and characterful than a loud psshhhh - which reminds me a bit more of a turbo diesel city bus or air brakes or a bagged car. Here's my footage.

The install is easy as pictured above and also no errors after a short drive. Dunno if it negatively affects mpg (due to some info of maybe it makes the car run a bit more rich) or anything else that could be negative longer term (nothing that's going to trigger a light).

you need to cut that green wire

 

[Kaz]

I would love a super loud STUTUTUTUTUTU...but that's compressor surge and not good for the turbo...but sounds so good

 

[Rayjoedef]

FYI....
Directly from GFB Tech Dept.

help you with?
	Hi, Purchased this bov and excited to get it installed. Is the item dialed in from factory at correct setting or do I need to adjust screw for optimal performance. Thanks Ray

Hi Ray,
There is no adjustment to be done on that valve. The slot in the top is for assembly only

 

[F1 SML8R]

Well that answers that. Don't mess with it!

 

[Lotus F1]

My adapter plate one works pretty good but I'd wanted it to be a little louder.

 

[F1 SML8R]

So I finally installed my GFB BOV today and just wanted to mention the following for anyone else who does this mod. I noticed 2 of the 3 OE valve bolts seemed to be “sticky” when I removed them. Almost felt like they were cross threaded. However, I noticed they had some red residue on them when I eased them out. So, I’m guessing they had the high temp red thread lock dabbed on each at install from the factory. I mention it in case anyone was afraid of removing them with extra force. Overall, the valve seems to deliver on all its promises. Although I do get random blow-offs, but apparently that’s normal for this valve.

However the bigger concern was unrelated. I noticed the heat shield passed the turbo on the passenger side has 2 bolts that caught my eye. Both were backed out almost half of their thread! Not sure why, but you may want to double check these. BTW the heat shield was visibly loose.

The following first pic is a wide shot for perspective (bolt of concern is closest to the O2 sensor in this first pic) and the second pic is a closeup shot of the top bolt that backed out (there are 2). If you follow straight down from the detail pictured bolt, you’ll see the second one below. 8mm I believe. BTW the pic was after I re-torqued it. that's why it looks normal.

 

[LotsOfTriumphsUsuallySexy]

great photos!

 

[Medic518]

I hate to admit it, but the longest part of the install was removing that stupid wire mounting/retailing clip - blasted thing had me stymied for like 5min ..

I checked the bolts @F1 SML8R mentioned - all tight. The plastic edge pieces for mounting the engine cover were a different story - every single screw (6 total) were completely loose, not just needing tightening but LOOOOOSE.

I will also say I was impressed with how much more robust the GFB BOV was compared to the OE BOV..

 

[F1 SML8R]

I hate to admit it, but the longest part of the install was removing that stupid wire mounting/retailing clip - blasted thing had me stymied for like 5min ..

I checked the bolts @F1 SML8R mentioned - all tight. The plastic edge pieces for mounting the engine cover were a different story - every single screw (6 total) were completely loose, not just needing tightening but LOOOOOSE.

I will also say I was impressed with how much more robust the GFB BOV was compared to the OE BOV..

Good catch! I had the same thing (screws holding the black plastic side trim pieces that the cover clicks into) but I found this the first time I took off the cover just to "check the engine out" when I first got the car back in March. Definitely a good reminder for anyone looking "under the cover" for the first time to check both of these areas.

 

[675430VME]

Just out of curiosity, why do you guys prefer BOV instead of DV?

 

[F1 SML8R]

Just out of curiosity, why do you guys prefer BOV instead of DV?

For me it's the noise. It's largely silly, but we all have our quirks.

 

[675430VME]

For me it's the noise. It's largely silly, but we all have our quirks.

But wouldn't that affect the sound of a modified exhaust? My buddy also has the GFB and sometimes I got confused with the sound of the BOV and the exhaust. I am guessing it sounds different in the cabin?

 

[F1 SML8R]

But wouldn't that affect the sound of a modified exhaust? My buddy also has the GFB and sometimes I got confused with the sound of the BOV and the exhaust. I am guessing it sounds different in the cabin?

Yup it's just more noise. I don't concern myself with distinguishing between intake, BOV and exhaust noise. All of them just add to visceral experience which I think many have said was seriously lacking with the OE i4 exhaust set-up.

I will say the BOV noise is quite obvious. Just think sudden tire pressure leak (Pssshhhhh!!! sound). Lastly, it is supposed to help (negligibly) with boost delay, because its boost release is progressive, not on/off.

 

[Medic518]

For me it's the noise. It's largely silly, but we all have our quirks.

I actually think, after doing a long drive yesterday and then today (before and after BOV swap), that there is a marked difference in the feel of the acceleration performance - I don't notice any lag when I step on it anymore. the new pssshhhh is prominent and flutter is almost completely gone. I understand the flutter is air pressure being forced back across the turbo (but I'm no expert), which is not good for sustained boost - probably why the drive seems much more even with regard to acceleration.

I was also reading that the metal construction of the GFB BOV was much better at sealing than the plastic body of the OE BOV, so that may play a part in maintaining the boost too..

 

[okyou]

I miss the flutter (ability to hear the flutter), if I'm honest. But from the outside it's pretty mental with the GFB.

 

[675430VME]

I will say the BOV noise is quite obvious. Just think sudden tire pressure leak (Pssshhhhh!!! sound). Lastly, it is supposed to help (negligibly) with boost delay, because its boost release is progressive, not on/off.

Shouldn't be a DV that helps with boost delay while BOV releases all air into the atmosphere and starts boost pressure from zero?

 

[Lotus F1]

Im selling my BOV from Burger Motorsports. 50% off , essentially new