BOV replacement: Forge Motorsports
Thread Starter
Senior Member
Joined: 03-11-2009
Posts: 327
From: WI
Green "installed" one is for lower 5-15 psi, yellow spring is for 15-23 psi.
http://www.forgemotorsport.com/conte...roduct=FMDVTUN
Just got mine yesterday but haven't really looked at it yet. The spring laying in the box was golden in color but I'm sure that is the "yellow" one.
http://www.forgemotorsport.com/conte...roduct=FMDVTUN
Just got mine yesterday but haven't really looked at it yet. The spring laying in the box was golden in color but I'm sure that is the "yellow" one.
Senior Member
Joined: 05-13-2008
Posts: 2,075
From: Knoxville, TN
Hey Guys, You know they make a BOV that mounts to the same housing unit, they know from testing that it won't fit the 'balts, but are unsure on an HHR. from looking at my buddies 'balt, we seem to have more room to add the one they sell that vents to atmosphere, without having to tap the IC pipes.
Senior Member
Joined: 09-09-2011
Posts: 372
From: South Haven, MI
Please Note:
The quoted spring pressure (Psi) relates to the un-assisted clamping force of the spring and should NOT be taken as an equivalent to boost pressure when determining suitability. Once a valve is fitted to a car it is subjected to various pressures that act upon the diaphragm or piston to aid its respective ability to seal or hold boost. An example of this, would be when using a FMCL007P valve on a 1.8T engine as found in the TT 225hp. The boost pressure on a "chipped" car can peak at 26psi. The recommended spring would be the Green or Yellow
The quoted spring pressure (Psi) relates to the un-assisted clamping force of the spring and should NOT be taken as an equivalent to boost pressure when determining suitability. Once a valve is fitted to a car it is subjected to various pressures that act upon the diaphragm or piston to aid its respective ability to seal or hold boost. An example of this, would be when using a FMCL007P valve on a 1.8T engine as found in the TT 225hp. The boost pressure on a "chipped" car can peak at 26psi. The recommended spring would be the Green or Yellow
. I've ran the yellow peaking 25-27 sometimes and never had an issue, for the K04 it's plenty sufficient.
Senior Member
Joined: 09-09-2011
Posts: 372
From: South Haven, MI
Personally I feel no need to go atmospheric on a stock K04 turbo, none. Not to mention the potential tuning issues you will encounter without a MAF relocate due to skewed readings. The Forge BPV is where it's at.
Senior Member
Joined: 05-13-2008
Posts: 2,075
From: Knoxville, TN
Joe, ever know anybody who actually needed a BOV? Me Neither, but most get it for the sound, some for the quicker shift, a few for harder boost hit, and then ther is always one guy who just thinks it looks good. MAF relocate aside, it is an added performance tool when used with a turbo above the 04