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1 Aug 2009, 13:08 (Ref:2513180)
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#1 | ||
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Racer
Join Date: Jul 2004
Posts: 390
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BOV
I race a nissan 200sx 1.8 turbo,
I have also fitted a Bailey blow off valve and have had some interesting discussion for and against BOV valves being fitted. So my Q, to you well informed people is... What advantage (if any) is there to having a BOV fitted, apart from the little whistling between gear changes, tho I quite like the sound of the pidgeon flutter, when i the BOV is removed.. Thanks in advance. |
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__________________
[QUOTE=Mike Kelly 1]Ah yes, the mystery of the year. Just where did that £17.50 go! :Shrug: :laugh: Some say he spent it on fags, some say he exchanged it for a traffic light air freshner for his race car. all we know is he's called PIT BULL! :)[/QUOTE] 
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1 Aug 2009, 16:08 (Ref:2513252)
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#2 | ||
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Rookie
Join Date: Jun 2009
Posts: 5
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It would be advised to leave it on. That flutter you mention is the turbine rapidly decelerating... which is said to possibly loosen the nut on the compressor. The BOV will just bypass the exhaust pressure and allow the turbine to free wheel, reducing the spool time for the next acceleration.
Alex |
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7 Aug 2009, 23:14 (Ref:2517616)
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#3 | ||
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Veteran
Join Date: Apr 2006
Posts: 1,910
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You will not loosen the nut unless it wasn't put on properly.
The flutter, it is more than just rapid deceleration it is air bouncing back along the inlet tract (from the throttle closing). It will flex the compressor blades as it comes back, which eventually weakens them and causes them to chip at the ends. All that said, there is a valid argument that states you want to have air stacked in the lines between the turbo and the thottle so that when you do open that throttle their is a rush of air to the turbine to help spooling/minimise lag. I I have done both and currnetly do not run a BOV, BUT I runn with a restrictor in my class, which limits the volume of air running through the motor, which could change the dynamic effect. THe other thing to consider is the size of the turbo you have on, a smaller turbo will spool faster anyway, but large turbos carry momentum, which can be a positive or negative depending on the situation. You can also adapt some techniques that will see the turbo spinning more consistantly, like always driving with the throttle cracked, promoting some flow through the motor |
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__________________
Contrary to popular opinion, I do have mechanical sympathy, I always feel sorry for the cars I drive.
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