How bad is 4.5lbs of boost on a 100% stock 305 TPI. It's on a SN2000. The motor approximately has 100k miles but runs great. Been supercharged 10,000 miles of it's life.

Anyway, about how much horspower is each pound of boost in a supercharged application?
thanks fellas

 

each lbs of boost is 10 % or something?

not bad for the motor... you dont wanna put a sc on a brand new factory motor anyways the piston ring gap is still to small...


anwyays, yoru fine, that motor will lats ya a while!

Steve

 

any more opinions??? Is it 1 boost=10hp???

 

Positive pressure (boost) is an irrelevant figure. It doesn't mean anything except the fact that it is resistance to flow. What I can say is my car with a Paxton SN92 producing 10.5 pounds boost, stock peanut cam and heads, I gained 1.1 seconds and almost 10 mph at the track. The general rule of thumb is that it takes 100 hp to reduce 1/4-mile E/T's by one second (or 10 hp for every 0.1 second). This infers that on my car, one pound of boost is roughly equivalent to 10 horsepower. However.....

After my engine rebuild with cam and heads (same blower), I produced only six pounds of boost (thanks to lower resistance by opening up the intake). I still gained 1.1 seconds and almost 10 mph. So what does this say? Less boost, yet the same results.

To conclude, you cannot make an equivalent statement such as one pound of boost equals 10 horsepower. Too many variables.

------------------
Willie

Supercharged 1987 305 IROC-Z, Daily-Driver, Emissions-Legal.
Former Paxton (6-psig): 12.57 @ 111 mph.
Former Paxton (6-psig) & former 50-hp nitrous: 12.04 @ 114 mph.
Current ATI D1SC (Initially 10-psig): Projecting high 11's.
Future ATI D1SC (15-psig): Gotta catch them pesky 26-psig boosted TTA's!!

http://willie.camaro-firebird.org/

1987 "20th Anniversary Commemorative Edition" Z28 Convertible -- Super Chevy Show Class Winner, 1998.