Pounds per Minute - Roush Supercharger

[WERA49]

Does anyone know the pounds per minute of air that a Roush supercharger, #422090, consumes?

People running turbo's regularly work with that information. I have searched and can't find the information anywhere.

A friend upgraded the turbo on his Mustang. The new turbo uses 160 pounds of air per minute. It will comfortably make 1,250 HP.


Rob

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[Cory S]

Something doesn't sound right here.....

Using 160 POUNDS of air per minute isn't happening...... and a turbo doesn't USE air. It draws air, compress air, and MOVES air....

As an example, my 2.65L compressor can draw up around 100 lb/min through the MAF sensor.

 

[Proshop]

Something doesn't sound right here.....

Using 160 POUNDS of air per minute isn't happening...... and a turbo doesn't USE air. It draws air, compress air, and MOVES air....

As an example, my 2.65L compressor can draw up around 100 lb/min through the MAF sensor.

I’ll have to check and see if my old logs from the Roush had that perimeter logged. Only issue is Roush ditches the maf and uses a map sensor when installed.

 

[engineermike]

The supercharger is 2.65 liters per rev and the supplied pulley is 80mm. If you do the math, that means it will move 118 lb/min air at 7350 rpm. But we know it doesn’t move anywhere near that, which is due to either a restrictive throttle body or other inability to fully fill the rotor cavities at that speed. You’d need a compressor map to say for sure but I haven’t been able to find one. I also know once you get past 900 rwhp with the 2.65 blower, the gains of going higher really diminish and power falls off up top.

 

[Grimreaper]

My 2.3 rotor pack with ported lower mani will move mid to upper 70 lb/min at 8psi (85mm) and upper 70lb/min to low 80lb/min at 10psi(80mm]. Humidity and ambient temps matter a lot here. 4- 500ft above sea level. Stock twin 60 tb and roush intake assembly. Spinning to 7250 to 7500rpm

What's the end goal? Ideal setup on paper or chasing some numbers/ times?

 

[WERA49]

a turbo doesn't USE air.

Obviously. You like semantics, but you know what I'm asking about.

I have studied compressor maps for my BMW and my friend's Mustang. I'm asking about this particular supercharger.

The end goal is to learn about this supercharger and its limits. This thread is purely academic.

I have not seen the math for 80mm pulleys, 7,350 RPM and 2.65 liters. There's plenty of missing information and assumptions for me to arrive at 118 pounds of air per minute.

 

[drive_55_not]

Eaton specs the 2.65 TVS at 18,000 max rotor rpm = 3,377kg/hr = 122lb/min

Math for a stock crank damper 6.78"/3.15"x7350rpm = 15,800rpm. So that is theoretically 110lb/min.

You can over spin the TVS but the limiting factor is going to be pulling the heat out of the air charge as these things become a big ole heat pump the harder your spin it.



Eaton 2.65l

 

[WERA49]

Thank you sir. That is exactly what I was looking for.

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