Kraig,
5 psi is considered OK for most all engines too handle PROVIDED that the oil
system can supply both the engine and turbo without falling off too much
(Don "old-man" Smith might be able to advice on this).
As 5 psi is 1/3 of sea level atmospheric pressure (14.7 psi) in theory you
would get 1/3 more torque and horsepower across the board. In the real
world, you'll get 20% to 25% across the board when the turbo has spun up to
speed. This is due to increased exhaust backpressure and the compression
heating of the incomming fuel/air mixture.
IT would be a lot easier to (1) use a NOX bottle for the same increase, or
(2) bore and stroke the engine to 1500cc.
Where the turbo would prevail would be at altitudes 3000 ft and greater
where ALL normaly aspired engines have (by then) lost noticable power due to
the thinner air.
If theory, the lowest ET and highest traps speeds should happen at a high
altitule track with turbocharge/supercharges machines.
Even 5 psi can be serious business if ANY detonation raises it's ugly
head,,,, err to the mixture rich side always!
As far as engine life goes,,,,, expect about 20% shorter life if you use the
boost only every now and again and the system is set up well. Turbos put a
large increased heat load on engines. Worst case..... 15 to 20 seconds and
you'll have burnt a piston if you're too lean.
Robert
Costa Mesa
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