[Diy_efi] RE: Throttling intake air -- references

[Dave Dahlgren]

You might want to add EGT and MAT to the list as well, Turbo speed might be
interesting as well. Have you given any thought to the speed the system can or
should respond? the only reason I bring this up is with a large turbo on a small
engine that will make 20 or so lbs of boost you have a problem if you do not
have a BOV.. High rpm and a quick throttle lift is pretty tough on the turbo
which is essence what the control scheme you are proposing can do under certain
situations. There is some time delay between closing the throttle and the
turbine slowing to reflect the new energy level in the exhaust. Unfortunately
the compressor is still spinning at the old speed.. Real hard on the shaft and
thrust bearings.
Dave

Mike wrote:

> I suppose what I should do first, for my current setup, is plumb a
> couple of pressure gauges, pre turbine and post turbine or better
> still log these with manifold boost pressure vs a digital input
> so I know when wastegate actuated. Might be of interest.

> rgds
> 
> mike


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