Help-bov Issue

[MRGTR911]

Hi guys,

My lil bro just installed a Tomei BOV in his evo after previously having no BOV. Previously he had a compressor surge noise which is the loud flutter.

He installed the BOV and it plums backs into the intake system. He was expecting it to sound stock however it is still making the loud flutter on all boost levels and RPM ...

Any idea as to what could be the issue ? The BOV is brand new from the package.

Thanks

[DLOOOK]

Is it running a pod filter? Thats why

[MRGTR911]

Yeh its running a HKS-RS air intake from the turbo. Are you sure thats the reason its fluttering ?

[GUN_METAL_GTR32]

sounds about right to me.

my mate has a hks super seqential and it still chu chu's

[(OO)SKYLINE(OO)]

Aftermarket BOV + a HKS Air Pod = Massive "Flutter" and "Choo" noise.

I have the stock GTR BOV and twin HKS Air Pods and they make the "Choo" noise

[Turbz RB-25]

sounds about right to me.

my mate has a hks super seqential and it still chu chu's

Fail...

It should NOT "chu chu" assuming you've set the correct spring tension on the BOV.

1. Ensure that there is vaccum on the hose connecting to the BOV while running, maybe you've installed a line that has no vaccum.

2. Play around with the spring tension to make it soft enough to avoid compression surge, but hard enough so it doesn't leak.

[GUN_METAL_GTR32]

the bov still vents. but its very quick and then it gets the second half of the flutter.

its defiantely installed correctly.

[Turbz RB-25]

Is it far away from the TB?

Usually the BOV should be installed 30cm away from the trottle body to ensure optimal performance.

If it's closer to the turbo side, there will be some compression surge.

Have you tried loosening the tension in the spring?

[nicko2010]

hmmm

[MRGTR911]

after closer inspection, he noticed the lil hose that connects to top of Bov didnt lead anywhere. It was supposed to run into the intake manifold.

Car sounds and goes better now. nicer to drive after gear changed and has a small "chu" after acceleration.

so turbz-rb25 was right . "1. Ensure that there is vaccum on the hose connecting to the BOV while running, maybe you've installed a line that has no vaccum."