Blow off valve

[Jeff Hansen]

>If the blowoff valve were controlled by the engine management unit,
>the blowoff valve could be opened _fully_ when going off throttle.
>(The EFI unit already have the data to detect this condition.)
>Then the turbo should have less resistance and keep the speeed.
>Right or wrong?

That makes sense to me, but I have also been wondering about the turbine 
side. Wouldn't the turbine be trying to pull a vacuum through the engine 
during throttle-lift and cause the turbo to spin down? If so, the same 
concept could be applied to the exhaust side by using an electronicly 
actuated wastegate. What do you think?

I have been thinking about this because I was considering implementing some 
sort of electronic wastegate to allow the boost limit to adjust from 12-15 
pounds at low rpm to 7-10 pounds at red-line. Why? Well the way I see it 
there are all sorts of restrictions to power at the top end (air-flow, 
exhaust-flow, fuel-flow) that disappear at say half red-line why not take 
advantage of them? Any comments?

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Jeff Hansen
Anaheim, California, USA
JHansen777 at gnn.com
http://members.gnn.com/JHansen777/car/index.htm
Seven pounds of boost is a 'Good-Thing'
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