Oem Gtst/gtr Bov Idle Operation

[M E S O G L E A]

1. I know the OEM BOV is designed to allow metered air to re-circulate, but is it suppposed to be fully open at idle, closing as the vacuum reaches zero?

2. My PFC was tuned with/for an atmo SSQV. What is the major difference in the tune when using an atmo or recirc?

I ask because if I use the OEM BOV's it idle hunts and fouls plugs.

GTR BOV does not flutter but has bad idle, feels "soft" and fouls plugs.

SSQV has a great idle, very responsive but flutters.

Synchronic idle was not all that great, would open at the wrong times, fouled plugs and I just don't trust US made products.

Greddy is similar to the SSQV. I prefer the Greddy because it has a larger valve, the

recirc outlet will fit the OEM hose, has two springs (remove the smaller one and it

functions like OEM) and it is adjustable.

I even port matched and chamfered the cross pipes BOV outlet to the Greddy increasing the area by about 320mm.

I am going on deployment very soon and my wife will be staying in Japan driving this car. I will be taking in tonight setting up an appointment to have the tune adjusted, it needs to be functional for about a year with no problems.

[T04GTR]

yes meant to be fully open to avoid surge in the afm's. they must be plumbed back if using asn airflow meter

the factory gtr valves crap all over aftermarket ones

[M E S O G L E A]

I figured the OEM BOV was designed to be fully open at idle and light throttle. This would certainly avoid hunting and to stop the flutter.

I know you all like the GTR BOV but what makes it better than the Greddy RS?

The RS is very similar to the GTR in operation and design. The RS has a larger valve, is adjustable but has a smaller outlet. If I remove the smaller spring and it opens fully at idle, it should meet or exceed OEM.