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Discussion Starter #1 (Edited)
Morning guys,

Looking for a blow off valve.

Which one is the best?

HKS is the best I think but, are there more brands which are cheaper?
 

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Put down your Max Power, walk out of Halfords, go find some where quiet and have a word with yourself!

If you want to hear your turbos, get some intakes, something that arguably actually increases perfromance. BOV are cool when you have a Scumbaru, they are not the reserve of a GTR :)
 

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Discussion Starter #7
Put down your Max Power, walk out of Halfords, go find some where quiet and have a word with yourself!

If you want to hear your turbos, get some intakes, something that arguably actually increases perfromance. BOV are cool when you have a Scumbaru, they are not the reserve of a GTR :)
So you don't like the sound and keep on standard bov's.
 

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You start venting to atmosphere you run rich as you let the throttle off, potentially causing hesitation and backfires. Do a google there is enough literature out there and experiences of BOVs that will give you an idea of the pros and cons.

If you want induction noise, get yourself some GTC intakes for example. When the stock BOVs recirc air, you can still here the wooosh, only you wont be impressing the public on the footpath as they probably won't be able to hear, so perhaps not what you're after
 

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Discussion Starter #9
You start venting to atmosphere you run rich as you let the throttle off, potentially causing hesitation and backfires. Do a google there is enough literature out there and experiences of BOVs that will give you an idea of the pros and cons.

If you want induction noise, get yourself some GTC intakes for example. When the stock BOVs recirc air, you can still here the wooosh, only you wont be impressing the public on the footpath as they probably won't be able to hear, so perhaps not what you're after

Disadvantages:

In the case where a mass airflow sensor is used and is located upstream from the blowoff valve, the engine control unit (ECU) will meter out excess fuel because the atmospherically vented air is not subtracted from the intake charge measurements. The engine then briefly operates with a fuel-rich mixture after each valve actuation.

The rich mixing can lead to hesitation or even stalling of the engine when the throttle is closed, a situation that worsens with higher boost pressures. Occasional events of this type may be only a nuisance, but frequent events can eventually foul the spark plugs and destroy the catalytic converter, as the inefficiently combusted fuel produces soot (excess carbon) and unburned fuel in the exhaust flow can produce soot in the converter and drive the converter beyond its normal operating temperature range.

One way to mitigate the problem is to reduce the boost pressure, which reduces the required venting volume and yields less charge over-calculation by the ECU. The air can also be recirculated back into the intake, a typical stock setup for cars with an upstream MAF sensor. The situation can also be corrected by switching the fuel metering system over to a manifold absolute pressure sensor, a conversion that usually requires a compatible aftermarket ECU or piggy-back fuel controller. The MAP sensor monitors the absolute pressure in the manifold at all times and will correctly detect the change that occurs when the valve vents, allowing the ECU to reduce fuel metering accordingly.

wt* so it's even dangerous for your cat?!
 

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Disadvantages:

In the case where a mass airflow sensor is used and is located upstream from the blowoff valve, the engine control unit (ECU) will meter out excess fuel because the atmospherically vented air is not subtracted from the intake charge measurements. The engine then briefly operates with a fuel-rich mixture after each valve actuation.

The rich mixing can lead to hesitation or even stalling of the engine when the throttle is closed, a situation that worsens with higher boost pressures. Occasional events of this type may be only a nuisance, but frequent events can eventually foul the spark plugs and destroy the catalytic converter, as the inefficiently combusted fuel produces soot (excess carbon) and unburned fuel in the exhaust flow can produce soot in the converter and drive the converter beyond its normal operating temperature range.

One way to mitigate the problem is to reduce the boost pressure, which reduces the required venting volume and yields less charge over-calculation by the ECU. The air can also be recirculated back into the intake, a typical stock setup for cars with an upstream MAF sensor. The situation can also be corrected by switching the fuel metering system over to a manifold absolute pressure sensor, a conversion that usually requires a compatible aftermarket ECU or piggy-back fuel controller. The MAP sensor monitors the absolute pressure in the manifold at all times and will correctly detect the change that occurs when the valve vents, allowing the ECU to reduce fuel metering accordingly.

wt* so it's even dangerous for your cat?!
I refer you to post 4 of the thread :thumbsup:
 

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Discussion Starter #17 (Edited)

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I think Steve has the forge ones and andrew186 has the "go faster bits"? one.

I was looking into the GReddy ones:wavey: - they all seem to be roughly the same prices...but decided against them as to be honest you can't really hear them with a standrad hood. A vented one then maybe...

I have been in "Matt black gt-r" car a few times and drived it - he was thinking of getting some but the carbon cone filters he has sounds great (once the window is down).:nervous:
 

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Discussion Starter #19
I think Steve has the forge ones and andrew186 has the "go faster bits"? one.

I was looking into the GReddy ones:wavey: - they all seem to be roughly the same prices...but decided against them as to be honest you can't really hear them with a standrad hood. A vented one then maybe...

I have been in "Matt black gt-r" car a few times and drived it - he was thinking of getting some but the carbon cone filters he has sounds great (once the window is down).:nervous:
you mean this set?
GREDDY BLOW OFF VALVE BOV KIT NISSAN R35 GTR GT-R [email protected]@K | eBay
 
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