Pics of BOV installation for Carb Turbo

[th4neuk]

Hi All,

I've put some pics of the installation on webshots. Have a look at :-

http://community.webshots.com/album/83835046qsoOUP

I am well chuffed with the results. We took a longish trip out last night and the car seemed alot smoother and more responsive.

Anyone interested should drop me an e-mail.

Cheers

Alan Croft
89 Turbo

[maggio]

Hi Alan,

What is the main purpose of the Blow Off Valve (blow off high pressure)? Should this be done for EFI cars too? Looks like an easy installation. Thanks.
Jim
'87TE

[lotusguy]

maggio said:

Hi Alan, What is the main purpose of the Blow Off Valve (blow off high pressure)? Should this be done for EFI cars too? Looks like an easy installation. Thanks. Jim '87TE

Jim,

The main purpose of a blow off valve is to prevent the shock wave which is formed when the throttle is abruptly closed from traveling back and damaging the blades of the turbine. This shock wave causes the turbo to slam to a halt which stresses the blades excessively.

It prevents this by venting the built-up air pressure in the plenum when it senses a throttle closing either via a vacuum actuator or a solenoid operated one.

You also get the positive side benefit of lower spool-up time (less turbo lag) as the turbo keeps spinning instead of slamming to a stop. Happy Motoring! Jim'85TE

[maggio]

Once again & again...Thanks!

Jim, Who should I contact in NA to purchase a BOV? I am currently an unemployeed engineer, so every dime helps to save.

Thanks.
Jim

[Dr.Hess]

Keep in mind that the turbo guru's say that at the pressures we run stock (like .6 bar), a BOV is a waste of money. Unless you want that cool sound.

Dr.Hess

[lotusguy]

Dr.Hess said:

Keep in mind that the turbo guru's say that at the pressures we run stock (like .6 bar), a BOV is a waste of money. Unless you want that cool sound. Dr.Hess

Doc,

Sorry, but I have to disagree with this one. The Garrett T3 Turbocharger can spin at speeds exceeding 30K RPM.

At these speeds, continual and repeated throttle closings, with the accompanied near instant deceleration of the turbine, will cause premature wear and failure to both the bearing and turbine blades.

Any system which mitigates this from ocurring, such as a BOV, can't help but be a positive thing. Remember the prime function of a BOV is to protect the turbine blades and bearing. Any reduction in Turbo lag is merely a consequence of this primary function. Happy Motoring! Jim'85TE

[th4neuk]

Hi,

I'm with Jim on this one. Ive fitted this mod to the car to protect the turbo. For me the sound is a bonus. If you don't want the sound then you can get a recirculating one. I have noticed a big diference in how the car drives and on how it picks up after closing the throttle. It does seem quite a bit quicker. I have also supplied a kit to Dave Walters (on this forum) and I believe he is also well pleased with the results and has also noticed an improvement in the lack of Turbo lag. Considering the reduced pressure on the turbo I think any mod that can improve the life expectancy has to be of some benefit. BTW I am not a trader and have developed this kit for my own car just because many people said it couldn't be done. If people are interested then I will also try and work on something for the G-shape cars.

Cheers

Alan Croft
89 Turbo