4agze afm with ae101 s/c pulley / new pulley help

[reecegze]

i have a 175mm on the lil feral, with standard 125mm s/c it was doing a max of 14psi. when i put the smallport 120mm s/c on i was getting a max of 17psi, and was doing 13-14 psi by 3500rpm.

*useless feral after beer info # 234539*


reece, i ran a 160mm crank and custom fixed 90mm s/c pulley on the feral years ago. by memory was getting me ~15psi. with the smaller the s/c pulley it was very agressive, much over useing a larger crank pulley, i liked it.

Thats crazy you got an extra 2 psi just by swapping the afm charger to the map s/c ???

[feral4mr2]

smaller s/c pulley = more boost.

[reecegze]

Yer i know that but i didnt think 5mm smaller pulley would give and extra 1- 2 psi

125mm afm compare to the 120mm map Charger

[nick.parker]

Dont think, do the maths, a car with a stock crank pulley will get about +1 psi boost going to the 120mm sc pulley. But remember crudely speaking the power is actually related to ABSOLUTE pressure i.e. 14.7+8 vs 14.7+9.

(125/120 * (14.7 + 8psi) ) - 14.7 = 8.95 psi FTW

[reecegze]

so in other words its a good upgrade for a afm enigne