Turbo placement for T4 in bug

[Sandeep]

Great information guys !

I have just completed a spreadsheet to determine what type of turbo I should be looking for.

It has the following variables:

1. Engine displacement in cc's (1971)
2. Engine's volumetric efficency (85%)
3. Desired boost pressure (10 psi)
4. Engine rpm range (2000,3000,4000,5000,6000)

It calculates the pressure ratio using atmospheric pressure for all RPM's and gives me a boosted lbs/min of airflow.

I now have to plot the values on some turbo compressor maps to find the right turbo.

By playing with the values, I found out a 1971cc @ 14 lbs boost (6000 rpm) will flow as much lbs/min of air as a 2270cc @ 10 lbs of boost (6000 rpm). (23.91 vs 23.70)

Not sure how accurate this is in the real world but it seems like boost is the 'great equalizer'

Sandeep