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Old 12th June 2017, 04:03 PM   #1 (permalink)
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GFB BOV's

Hi all just fitted my BOV's, do they impact fuel, I'm only running stage 1 everything else is stock apart form y pipe.

Thanks
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Old 12th June 2017, 07:06 PM   #2 (permalink)
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Never mind fuel, can you hear them ?
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Old 12th June 2017, 07:51 PM   #3 (permalink)
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Poooooooointless!!!!
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Old 12th June 2017, 08:15 PM   #4 (permalink)
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Quote:
Originally Posted by snuffy View Post
Never mind fuel, can you hear them ?
sound amazing really happy with them
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Old 12th June 2017, 08:58 PM   #5 (permalink)
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sound amazing really happy with them
I had dump valves on previous cars and I loved the sound. But I do wonder how much I'd be able to hear them given the GTR's quick gear change and my silenced exhaust.
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Old 12th June 2017, 09:00 PM   #6 (permalink)
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I'm running stock exhaust and got them fully atmospheric.
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Old 12th June 2017, 09:46 PM   #7 (permalink)
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They only sound off on lift off, they don't do anything on gear change on this car
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Old 12th June 2017, 09:51 PM   #8 (permalink)
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They only sound off on lift off, they don't do anything on gear change on this car
correct.
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Old 12th June 2017, 10:30 PM   #9 (permalink)
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They only sound off on lift off, they don't do anything on gear change on this car
I see.

On my last 2 cars with dump valves you could slow your gear change down for maximum noise. I've always wondered about the GTR when it's in control of gear change.
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Old 13th June 2017, 06:32 AM   #10 (permalink)
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They only sound off on lift off, they don't do anything on gear change on this car
Gearchange is so quick that there's never a real moment where the throttles close and a BOV is required.

It's also the reason why your MAF tuned GTR doesnt drive like crap using VTA BOVS.

Personally I think you're risking bore wash, fuel into oil contamination, crapped up spark plugs when to VTA on a MAF tune.

Go SD if you want VTA with no risk.

Back to OP question... you're risking a slight increase in rich running when off throttle as the standard tuning method is MAF and the ECU has already injected the correct amount of fuel for the metered air, so when it's blown off you run rich.
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