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BOV Positioning 

 

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Posted: Tue May 06, 2008 8:33 pm 
Stock as a Rock
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Location: Canberra
ACT, Australia

The main point to mention is that most factory stuff is very small, when you start uysing much bigger turbos the shafts lack strength relative to the mass of the wheels, when compared to the smaller units. Half the nosiy junk that people fit is useless anyway, noise is restriction, I hate carbs.

The turbine's inertia can snap the shaft when the compressor is suddently stopped or agressively slowed. Its much more prominant of large turbo's.

Another thing is the ETT wheels are more succeptible to damage as the leading fins are relatively unsupported, they can bend if the flow reverses.

 

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Posted: Tue May 06, 2008 9:18 pm 
Getting Side Ways
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Location: Kellyville
NSW, Australia

Hey,

Does the pressure in the manifold help open the BOV, as i connected mine and i assumed it would open under vacuum, but it didnt, but it was very easy to push in????

Cheers

:D Daz :D

 

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Posted: Tue May 06, 2008 11:28 pm 
Getting Side Ways
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It needs to be connected on ENGINE side of throttle body.. The vacuum and boost pushes against spring...

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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Posted: Tue May 06, 2008 11:32 pm 
Getting Side Ways
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Age: 64

Posts: 3552

Joined: 7th Nov 2004

Gallery: 4 images

Power: 482 rwkw

Location: Penrith
NSW, Australia

ltd351T wrote:
The main point to mention is that most factory stuff is very small, when you start using much bigger turbos the shafts lack strength relative to the mass of the wheels, when compared to the smaller units. Half the noisy junk that people fit is useless anyway, noise is restriction, I hate carbs.

The turbine's inertia can snap the shaft when the compressor is suddenly stopped or aggressively slowed. Its much more prominent of large turbo's.

Another thing is the ETT wheels are more susceptible to damage as the leading fins are relatively unsupported, they can bend if the flow reverses.


Yes also bigger turbo's generally mean higher boost levels and with front mount intercoolers, bigger piping etc there is a lot of pressurised air [energy] wanting to escape some where.. I broke some little Nissan turbo's running without BOV.. Best to run one..

 

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As in ZOOM 126 edition
331 Dart block,3.25/ 4340 steel crank, Oliver rods,TFS ported track heat heads, TFS track heat inlet Twin SC61 turbo's
Project 1UZ-EF has started.. S475 Turbo 4.0 V8 Mustang Celica.....

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