I'm looking for a little info. I've called several manufactures of 6-71 style blowers, and haven't received a definitive answer.
I know it takes HP to turn the blower-let's call that X. Just for the sake of this discussion, let's say X=100HP
The FlatCad made 570HP at 14.2lbs boost. If I took the blower off, and added a turbo, at 14.2 lbs boost would I then see that 100HP in my net numbers-670HP?
...or am I looking at this wrong?
Yes, I know the turbo isn't legal in Vintage class!
38 flattie... it would be easier to answer your hp question if the intake charge temp was known but with no intercooling
or cooling from gas my charts show a 75-98 deg differance over a 45% efficient roots type blower.
Dyno videos are hard to tell if you had ice water circulating through intercooler.
A couple reasons why we went with centrifugals over turbos over [20 yrs now] is that the centrifugals don't have instant
boost as the Turbo's did in those days allowing more throttle controll and less instant wheelspin Also keeping the fuel matched to the instant boost was harder to do then than now. New turbo controls and EFI have overcome those problems.
In 1994 we had a time of 288 mph with a 279 mph exit speed. Overdrive trans clutch slipped, went back to dirrect drive
engine went to 8500 dropped valve and blew one blower apart.
We knew the combination was making good hp and despite having problems driving two blowers we have stuck with the centrifugals. Besides we like the sound [ some racers think we run fuel]
Manufactures have finally
developed an independed drive for two blowers and in Pro Chargers case made blowers with enough CFM to only use one.
Their are old Indy and Fuel injector guys [Gene Adams for one] that know what parts to use for the no electronics setup
for turbos and centrifugals.
p.s. I have a Hillborn boost sensing device I'll contribute, if wanted