Super charger and turbo question

[Eric Sanborn]

ScottyCBoy at aol.com wrote:

>In my search for more power I've gone insane...
>
>
>Any body have comments one something like this? Most books I have seen only mention either turbos or superchargers, and not both..
>
>  
>
The turbocharger is as you would imagine a turbine pump.  The volume air 
flow is dependant on speed as well as pressure differential.  The Eaton 
you are looking at is postive displacement.  This "pump" moves a preset 
amount of air every revolution of the shaft.  If you have two pumps in 
series you will run into cavitation problems if they don't flow the 
exact same amount.  If you put them in parrallel I don't know what would 
happen.  Likely at low RPM/high boost from the eaton the turbo would 
want to run backwards, but would be counter acted by the exhaust gasses.

I don't know it is starting to make my head hurt thinking about it.  The 
reason you never see it could be for no other reason than complexity and 
cost.  I seem to recall my internal combustion engineering text book 
from college had it as a possible type of system.  I would think you 
would need to tune the two systems separately.  Eaton for idle to say 
3500 rpm, turbo from there up.  I just see problems written all over it.

(I appologize in advance for my blasphomy against all that is turbo).  
Ditch the turbo idea.  Get a big IC and run the eaton with 12 to 14 
lbs.  If I remember correctly the T-Bird has a 3.8.  Your V-8 is likely 
a 3.6 so this eaton (size 62?) is a very good fit).  Somewhere out there 
is a good site where someone added an IC to a T-bird and had very good 
results with more boost.   I think that route would be easier since you 
could use the factory exhaust manifolds still and you would just have to 
make a bracket for the SC and add some plumbing (which would be simpler 
than the plumbing for 2 turbos).

If you are concerned about an SC's ability to make top end power see if 
you can find anyone who still has a G60 Corrado on the road.  A good 
friend of mine had one running 17 lbs of boost.  It was very fun :)

-- 
Eric Sanborn
'85 4ktq

http://sofadog.net/4ktq/