Quote:
Originally Posted by Jessika@Magnacharger
If you run a 9" crank pulley you can run a 3.6 @ 12lbs easily.
The stock crank pulley should be 7.527
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(Disclaimer: if all research and tech information from a competitor's web site is correct)
I am not attacking anyone here so please don't take this personal. Just trying to clear the air or my potential confusion.
With a 3.6 SC pulley and a 7.5 crank pulley this means his ratio is ~2.07:1 and multiply that times the engine RPM limit 6500 and a blower RPM of 13448 should get the estimated boost rated at sea level of ~11 psi.
Does being at 1000FT above sea level reduce boost pressure by 4 lbs?
Also isn't the 9 inch crank pulley about 3 sizes larger if they go up by .5 in increments?
Isn't each increment in crank pulley size supposed to change the boost by 4 psi? (again if research is correct)
Wouldn't the 8 inch crank pulley be the preferred size with the 3.6 SC pulley add 4 psi onto the OP's current rating of 7.5 and he should get 11.5? (pushing the limit of stock internals only if he were to take it to 6500 RPM or higher. He might actually have to go up on SC pulley size to a 3.75 to get back down to ~10 psi)
A 9 in is 3 sizes up and would normally add 12 psi making a total of 19.5 psi with the 3.6 SC pulley instead of a total of 12 with the 3.6?
Also, this is with all of the OP's engine internals and exhaust remaining the same.