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Attached is a good reference chart Lingenfelter was kind enough to make available to all. May help with your decision. View attachment 158987
If you were to spin the blower to 27,300 rpm, how much 'Hot Air'
would be present at the output of the blower. . .

Below the value of 1728 equals 12^3, or one cubic foot.
And where the 1.9L blower, equals 115.9 Cubic Inches.

=> (115.9 * 27,300 / 1728)= ~1,831 CFM.

If that air was at, or around 70°F, the engine could produce about. . .
=> (1831 * 0.67)= 1,227 fwHP.
***The value of 0.67 is equal to the ASE% for an efficient engine. . .
Or the Air Standard Efficiency Percentage.

Working with these numbers now for many years, I have determined that a 'Good' mass flow recovery system, will reduce (via cooling) that value of 1,831 CFM down to a useful number, when we apply the value of 75%.

=> (1831 * 0.75)= ~1,373 CFM.

This would amount to a 'potential' value of ~920 fwHP. . . .On Gasoline!

Please understand that a stock blower will not flow that amount.
It must either be ported, or a larger blower put into service.

Please also understand that adding Meth around the blower, can help immensely.

Cheers
 
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Wonder how long the blower would last if it were spun to 27,300. I know it's bursts of WOT but....
 
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Wonder how long the blower would last if it were spun to 27,300. I know it's bursts of WOT but....
Actually, that is a very important point, and many have had to learn that, the hard way.

Run 'One Bar (14.7 gauge psi)' of boost, or 'Two Bar ABS (29.4 psi)' on the street, with E85, and be happy..lol

Above, the term ABS simply stands for 'Absolute Pressure', not gauge pressure.

Ambient pressure surrounding you, is about 14.7 psi. . Depending!
So that is added to gauge pressure, for the ABS Value.
 
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