: 10" Pulley ?



qictrk
07-28-09, 05:12 PM
Just curious if anyone has tried W4M 10" pulley. I would like to give it a go, but i don't want to be the first. Not even sure how much more i would pick up since i already have the 9 1/2". Cecil.............

jwa999
07-28-09, 05:50 PM
Just curious if anyone has tried W4M 10" pulley. I would like to give it a go, but i don't want to be the first. Not even sure how much more i would pick up since i already have the 9 1/2". Cecil.............

I'm thinking about it. It should give a 25% increase from stock. Jesse also mentioned gave the idler pulley better stability. 9.5 -> 10 is 5.2% increase of what your currently have. Your' going from 18.5 to 25% above stock.

qictrk
07-28-09, 06:08 PM
I'm wondering how much more boost it would give me. I currently have about 12 lbs. That works out to only 1 more lb of boost by that calc. Cecil.......

Luna.
07-28-09, 11:45 PM
What have you dynoed at right now? I'm very interested to see...

jwa999
07-29-09, 12:35 AM
I'm wondering how much more boost it would give me. I currently have about 12 lbs. That works out to only 1 more lb of boost by that calc. Cecil.......

So, that made me think how to calculate the effect of boost on HP:

without boost, 1 atmosphere is 14.7 psi. So with 7.6 lbs boost, total is 22.3 psi of air going into the engine = 556 hp.
So every 1 lbs of boost = 24.9 increase in HP!
With a loss of 18-19% in an auto tranny, we're still talking over 20 rwhp per 1 lbs boost.

Hans.

marcw
07-30-09, 12:23 AM
a 10" pulley is too big...it will interfere with one of the idler pulleys......

jwa999
07-30-09, 01:17 AM
Wait4me says:


Im just curious as to how many i should have built. They are 100% needed for those of you guys wanting to run the 10inch and larger rings, And would be a beneficial upgrade for those running a 9.5 as it moves the little idler a little more out of the way of the crank for better alignment.

9.55 ring has been hitting in the 550-560 range, The 10 adds 30-40 more.