| Author | Topic |
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Location:
Melbourne
Registered:
October 2003
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Re: BOV's
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Fri, 07 January 2005 11:33
 
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The turbo bearings were designed to cope with the shaft loadings and force to allow the turbo to spool in a time X, and hold the force from the wheels caused by the pressure on both the intake and exhast side. So with some backpressure slowing the turbo to a stop in a time possibly longer than X should be well within the design limits.
To sum that up, the shaft loads from backflow are nothing compared to the shaft loads from the turbo in operation.
Remember when the foot is off the pedal, shit all exhausts gas
is trying to keep the turbo spinning in the forward direction
so this slowing of the comp wheel is not too stressful.
I do think a BOV would be useful in saving pipes/hoses..
I was running 2-3 pounds when my turbo wasn't spooling due to
a dodgy wastegate, and I was cheking for leaks by moving my
gauge around and observed spikes of around 9-10psi that fluttered downto 5psi in sync with the noise. Basicly 9-10psi
of flutter-pressure off only 2-3psi boost. I never saw what it got upto when i was running 17psi, but i'd image something
like 30psi possibly more. I always lost hoses letting off the
pedal..
But rather than go and buy a bov i'd just spend the cash on better intake pipes or something that will deliver more go per $.
I don't know how many of you will agree with this, but i think not running a BOV can be a performance advantage. There is a point with your intake tract, depending on overall volume where the air will act like a spring compressing. Catch it before it bouces back with an open throttle, and you'll get a nice big pressure wave straigt into the manifold. I don't know if it's the shoddy tuning of my engine, but with some specially timed
gear changes i get a burst of torque down low where the turbo
isn't normally spooled. If i leave it a split second too long i loose it all.
Lastly, about the turbo timer, heat soak from an idle car is nothing compared to a turbo at 800deg C. But the few times I would be in this situation i could handle sitting in the car for a bit... but there are some who would rather not, and i guess it's up to them.
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| | Subject | Poster | Date |
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BOV's
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WantaTurbo | Thu, 30 December 2004 06:34 |
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Re: BOV's
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STR8 2.8 | Thu, 30 December 2004 08:29 |
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Re: BOV's
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toof | Thu, 30 December 2004 09:13 |
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Re: BOV's
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WantaTurbo | Mon, 03 January 2005 12:20 |
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Re: BOV's
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styler | Tue, 04 January 2005 07:06 |
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Re: BOV's
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Cool1 | Tue, 04 January 2005 07:08 |
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Re: BOV's
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WantaTurbo | Tue, 04 January 2005 09:17 |
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Re: BOV's
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Kyosho | Tue, 04 January 2005 09:35 |
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Re: BOV's
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Norbie | Tue, 04 January 2005 10:19 |
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Re: BOV's
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Kyosho | Tue, 04 January 2005 10:25 |
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Re: BOV's
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Norbie | Tue, 04 January 2005 14:49 |
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Re: BOV's
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styler | Wed, 05 January 2005 02:55 |
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Re: BOV's
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wastegate | Wed, 05 January 2005 06:26 |
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Re: BOV's
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pro_ke | Tue, 04 January 2005 09:24 |
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Re: BOV's
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Cool1 | Tue, 04 January 2005 09:30 |
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Re: BOV's
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pro_ke | Tue, 04 January 2005 10:30 |
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Re: BOV's
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86twinky | Tue, 04 January 2005 10:31 |
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Re: BOV's
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Kyosho | Tue, 04 January 2005 10:41 |
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Re: BOV's
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mrshin | Tue, 04 January 2005 10:36 |
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Re: BOV's
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Kyosho | Tue, 04 January 2005 10:45 |
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Re: BOV's
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mrshin | Tue, 04 January 2005 12:03 |
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Re: BOV's
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Chris Davey | Tue, 04 January 2005 13:25 |
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Re: BOV's
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STR8 2.8 | Tue, 04 January 2005 14:10 |
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Re: BOV's
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86twinky | Tue, 04 January 2005 20:23 |
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Re: BOV's
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sxturbo | Tue, 04 January 2005 22:39 |
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Re: BOV's
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WantaTurbo | Tue, 04 January 2005 22:45 |
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Re: BOV's
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Aust162 | Wed, 05 January 2005 05:57 |
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Re: BOV's
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WantaTurbo | Wed, 05 January 2005 06:29 |
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Re: BOV's
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RA65 Sleeka | Wed, 05 January 2005 07:16 |
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Re: BOV's
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Ae92rolla | Wed, 05 January 2005 08:57 |
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Re: BOV's
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Spanktown | Wed, 05 January 2005 09:47 |
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Re: BOV's
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thechuckster | Wed, 05 January 2005 13:06 |
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Re: BOV's
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Norbie | Wed, 05 January 2005 10:06 |
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Re: BOV's
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Kyosho | Wed, 05 January 2005 10:42 |
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Re: BOV's
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Norbie | Wed, 05 January 2005 12:49 |
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Re: BOV's
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off-road | Wed, 05 January 2005 10:10 |
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Re: BOV's
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Spanktown | Wed, 05 January 2005 11:14 |
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Re: BOV's
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pro_ke | Wed, 05 January 2005 11:41 |
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Re: BOV's
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joyride | Wed, 05 January 2005 21:08 |
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Re: BOV's
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Ae92rolla | Wed, 05 January 2005 21:22 |
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Re: BOV's
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joyride | Wed, 05 January 2005 22:22 |
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Re: BOV's
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WantaTurbo | Wed, 05 January 2005 22:56 |
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Re: BOV's
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86twinky | Wed, 05 January 2005 23:41 |
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Re: BOV's
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Norbie | Thu, 06 January 2005 11:50 |
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Re: BOV's
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pro_ke | Fri, 07 January 2005 06:36 |
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Re: BOV's
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Norbie | Fri, 07 January 2005 06:41 |
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Re: BOV's
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pro_ke | Thu, 06 January 2005 22:05 |
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Re: BOV's
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Norbie | Fri, 07 January 2005 01:10 |
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Re: BOV's
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pro_ke | Fri, 07 January 2005 03:37 |
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Re: BOV's
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86twinky | Fri, 07 January 2005 03:46 |
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Re: BOV's
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Norbie | Fri, 07 January 2005 05:16 |
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Re: BOV's
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joyride | Fri, 07 January 2005 03:43 |
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Re: BOV's
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pro_ke | Fri, 07 January 2005 03:56 |
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Re: BOV's
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Norbie | Fri, 07 January 2005 05:21 |
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Re: BOV's
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pro_ke | Fri, 07 January 2005 06:57 |
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Re: BOV's
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Joshstix | Fri, 07 January 2005 07:09 |
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Re: BOV's
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Norbie | Fri, 07 January 2005 08:12 |
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Re: BOV's
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pro_ke | Fri, 07 January 2005 10:51 |
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Re: BOV's
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hemi twofifteen turbo | Fri, 07 January 2005 11:33 |
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Re: BOV's
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YelloRolla | Fri, 07 January 2005 22:14 |
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Re: BOV's
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Norbie | Fri, 07 January 2005 12:56 |
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Re: BOV's
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Cool1 | Fri, 07 January 2005 07:03 |
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Re: BOV's
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Cool1 | Fri, 07 January 2005 07:06 |
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Re: BOV's
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pro_ke | Fri, 07 January 2005 07:11 |
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Re: BOV's
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pro_ke | Fri, 07 January 2005 07:06 |
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Re: BOV's
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Cool1 | Fri, 07 January 2005 07:11 |
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Re: BOV's
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Cool1 | Fri, 07 January 2005 07:12 |
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Re: BOV's
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boxh34d | Fri, 07 January 2005 12:21 |
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Re: BOV's
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off-road | Fri, 07 January 2005 07:13 |
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Re: BOV's
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Toobs | Fri, 07 January 2005 07:47 |
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Re: BOV's
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Spanktown | Fri, 07 January 2005 07:58 |
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Re: BOV's
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Norbie | Fri, 07 January 2005 08:13 |
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Re: BOV's
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Spanktown | Fri, 07 January 2005 11:59 |
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Re: BOV's
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Cool1 | Fri, 07 January 2005 08:18 |
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Re: BOV's
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mrshin | Fri, 07 January 2005 11:32 |
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Re: BOV's
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Norbie | Fri, 07 January 2005 13:03 |
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Re: BOV's
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mrshin | Fri, 07 January 2005 13:12 |
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Re: BOV's
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Norbie | Sat, 08 January 2005 01:29 |
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Re: BOV's
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pro_ke | Fri, 07 January 2005 16:28 |
