got a stock 305, want to run a turbo setup.
how much hp gain can i expect running a low 6psi?

thanks

 

6 psi of forced air is worth up to 40% more horsepower. If the air temperature is increased significantly, the power increase will be less.

 

well this may/may not give u an idea... but when i took my car into the chop to have my mechanic tune it/ new comp chip, there was a 96 t/a *all stock except free mods and exuast* getting a s/c put on with a 6psi kit. my mechanic said it was prob going to make 400-410hp. i dont know if a d/c and turbo's #'s r going to be different.. but if ur 305 was anything liek my 305 (190hp) expect about 75-80 hp.

 

what turbo wqould you be running?

 

20-25% without an intercooler, depending on compressor efficientcy. Anything between that and 40% with a good intercooler.

 

looking at an old rajay setup a friend has in his shop.

i need power help.

lol

 

(boosted PSI/14.7)*stock HP = HP increase ideally

 

zeroto60v8, the only time that that would be right is if you had a 100% efficient intercooler, which like anything 100% efficient is very unlikely.

to compute the actual what you do is convert the inlet temp to *R, calculate the ideal temp rise due to the compression of the air, divide that by the adiabatic efficiency of the compressor, divide the ideal temp by the actual temp (again, in degrees R) and multiply it by the pressure ratio (the number that you were computing) and then you get a density ratio.

Or trust me when I say about 20-25% for most turbos working in their efficiency range (anyplace 65-80%) at that pressure ratio

 

Depends on size of turbo and your intake setup. Old RayJay turbo .. like the ones in the old Gale Banks kit?

 

That's why i said "ideally" just take that number and multiply it by .7 to get a more realistic number if you don't have all the other values to do a specific equation.