amoosenamedhank

I was just wondering what you guys were typically seeing for a boost increase as you dropped pulley sizes.

Basically, I'm running a 3.33" pulley right now making about 6-7lbs (390rwph) and I'm trying to decide whether I should drop to a 3.125 or a 3" pulley.

The most I would want to pick up is aound 3lbs.. Do you think I could get this down with a 3.125?

lizzyfan

3.1 gives me 13 psi without intercooler

amoosenamedhank

well I know my setup is already off from other peoples... I think it probably has to do with the 5.4 because most people with an S-trim, power pipe, FMIC and 3.33" pulley are normally seeing more than 6-7#s.

Mustang_NTriangle

Lizzy with 3.1 pulley with intercooler or aftercooler would you expect more psi than 13 assuming stock heads and no LTs?

jvog

I am seeing 6.8#s with the above mentioned parts.

amoosenamedhank

hmmm maybe that is normal? It just seems like everyone is getting some much more boost with this setup... either way jvog you should drop a pulley size this weekend so I know how much boost I'll pick up

jvog

Haha I'll drop a couple pulley sizes when I drop my motor in, but that won't be for a couple of months. I think my boost numbers are really low, and I did a leak test on my setup and its not leaking anywhere.

Mustang_NTriangle

my 3.33" pulley with aftercooler I was at 10 psi.

amoosenamedhank

Stock heads and cams? Did you have a power pipe with that setup?

lizzyfan

I doubt it