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What if I were to use factory compression and 5lbs of boost? Would that yield about the same power as, say, 8:1 and 10lbs?
Just a thought.
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What's the factory compression?
Class III CNC Machinist/Programmer
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That, I am not sure. The engine is a '76ish 250. It will have a 194 head with some work. I would think about 9-9.25:1?!
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Joined: Dec 2005
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More boost means more air is being forced into the engine which makes more power. The higher boost makes more cylinder pressure which is why you need to be careful on how much compression you run, or else you will have to kill the ignition advance to make it live.
This is why a better flowing head will make more power at lower boost, higher compression, and more ignition advance.
Harry
Turbo-6
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More boost alone will not nessarly make more power if you don't have enough fuel to go with it, this becomes the biggest problem how to get enough fuel to keep the engine from detonation and melting parts.
With siamesed bump ports, to get better air flow, the easy way is to use fuel injection with methanol it can be run extermely rich, almost like a Top Fuel car, the cylinders run cooler won't lean out as easy and melt parts. otherwise keep under 400 HP
With the 12 port Sissel Kirby head (the best flow )you can you can make more power with an intercooled, injected or carb set up on gas.
Harry
Turbo-6
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More compression with less boost gives more around driveability. Less compression with more boost will give more peak power. It depends on what your goals are.
"The first rule of overkill: You can never have too much overkill."
"Overkill is underrated."
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Joined: Dec 2005
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This is true, but why turbo a car if you want driveability.
A Hot Rod is a mean, nasty, scary thrill to drive.
Harry
Turbo-6
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You and I are on the same page for sure, Harry. Driveable cars are boring!
"The first rule of overkill: You can never have too much overkill."
"Overkill is underrated."
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I think a streetable car is running 3600 RPM stall,use a trans brake @ see 4000-4100.
A 4l85E trans that wont over heat @ take long trips to the track, no trailer for my Car. But that's just part of my idea of a street car.
MBHD
12 port SDS EFI 
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