[Diy_efi] Turbine inlet & outlet pressures, housing A/Rs

[Greg Hermann]

At 3:17 PM 1/6/03, Grant Beaty wrote:
>> Absolute pressure ratio, all the way.
>
>As in 1 psi of backpressure will produce 2 psi more TIP if the pressure
>ratio is 2:1? If thats the case, I gotta do something about this 2 psi of
>TOP...

Perzactly if mass flow , inlet EGT, and shaft power output remain constant.
>
>Or do you mean the pressure ratio influences the effeciency of the turbine?

Different issue.

>I've never been able to find any info of turbine sizing, but I'd ASSume they
>are quite similar to compressors.

They are. The biggest difference is that the efficiency issue changes from
"you can't win" to "you have got to lose"!!
>
>> >How about exhaust housing a/rs. Will a larger a/r always produce a lower
>> >TIP,
>>
>> Sure should.
>>
>> Greg
>
>Interesting. The .81 a/r housing I had lagged about 300 rpms more than the
>.70 housing, and produced the same amount of airflow (according to my MAF).
>Due to time constrants I wasn't able to properly port-match the .81 housing,
>however I doubt that matters as the .70 housing that was on there before was
>divided, and I have an undivided log manifold. Guess I need to hook up the
>pressure gauge and take more readings.

As always, one needs apples vs. apples, not pomegranites to get meaningful
numbers !!

Greg
>
>Grant Beaty
>
>
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