Fg Turbo 4" Intake - Picture

[Ralph Wiggum]

There is clear evidence that a BOV helps with turbine longevity, but there doesn't appear to be any research that indicates how much less longer a turbo will run without BOV,

because air cannot escape it is forced back into the turbo, which inturn rapidly reduces fan speed, this then puts greater pressure on fan, shaft and bearings.With out sounding like a Nizpro Fan Boi, Simon did some pretty extensive test with a turbine tach and few years back and could produce a significant reduction in turbine speed when the throttle was closed rapidly on a non Bov car. People tend to over look the fast that as the throttle is closed the pressure thats driving the turbo is also reduced substantially. Dont forget we are no longer playing with plain journal bearing turbos with 8mm or less dia shafts Could 1000k,s could be 100,000k's, no-one seems to be able to answer this question.

But there is no doubt that manufacturers provide this equipment to a vehicle for reliability, not so much for performance.Reliability or noise reduction? Not every Joe Public wants a fooly sick Dose noise when he backs off the throttle

However, there appears to be more lag without BOV and is more noticable in a manual than auto, cheers

I have to disagree with that statement, my car (manual) comes back on boost much quicker and a rapid gear shift with no bov.

[Gonadman2]

Sitting in traffic and driving through heavy traffic the pod will be nice and hot all the time.

I tested this theory in my old MY00 WRX. I was running an Autronic ECU, so was able to complete data logging on the intake charge air temp, as measured in the manifold. With the pod charge air temp would go as high as 65-70C when idling at the lights, in traffic on a 20C ambient day. By the time I got to the other side of the intersection, the intake temp had dropped to 25C, and doesn't go much lower. I also tested this with a makeshift CAI to the pod, and this made no measurable difference according to the logging unit. I wish I still had the data... Personally CAI's are overrated, and most people don't realise how much air is being sucked into the engine at higher rpm, and how much air is moving through the engine bay while moving.

[xr6t_ute]

Id like to see it logged on a 30c day and see the difference.

[Dillz]

There is clear evidence that a BOV helps with turbine longevity, but there doesn't appear to be any research that indicates how much less longer a turbo will run without BOV, because air cannot escape it is forced back into the turbo, which inturn rapidly reduces fan speed, this then puts greater pressure on fan, shaft and bearings. Could 1000k,s could be 100,000k's, no-one seems to be able to answer this question. But there is no doubt that manufacturers provide this equipment to a vehicle for reliability, not so much for performance. However, there appears to be more lag without BOV and is more noticable in a manual than auto, cheers

Completely agree.