i have an 87 iroc-z im thinking about getting underdrive pulleys but im having voltage problems as it is so i was thinking about just getting the crank and water pump pulley if i run these 2 pulley how much hp should i gain also will it affect my water pump in anyway as for cooling

 

i would guess about 5-10 HP gain and most likely,yes u will have some cooling problems. i would think u would notice them when ur sitting at a red light rather than driving down the road.

 

March sells a set of pullies that turns your altenator at a higher speed,this should help with your charging problem. The set is called Power & Amp by March.


T.