08-11-2006, 04:51 PM
Thirdgen89GTA Wrote:Yes and no, If its a forced induction motor a pulley is REALLY good. If its a N/A motor then it really doesn't net all that much.Not sure about T/A's, but worked well on all my mustangs. One time, one the dyno, we took off the belt completely for one pass just see how much power the accesseries were robbing. This was on a '93 5speed Mustang GT. We picked up 37HP to the tire by taking off the belt!! Underdriving the pulleys didn't do me any harm in that car or the cobra I had after that. They were a great purchase IMO.
I'm not a big fan of under drive pullies on daily driven cars. Puts too much stress on the alternator, as well as less coolant flow. If you get stuck in traffic I'd rather have good flow through the radiator and a strong alternator to keep the AC workin good. If it were a street/strip car where it really wasn't driven all that much, and spent alot of time at the track I'd go with underdrive pullies too.
If the car is undercammed then and the heads can support the flow then higher ratio rockers are also a good mod. Had 1.6RR's on my small block. .530"/.560" lift on a 211/219 duration cam. Idled perfect at 500rpm all day long. Couldn't even tell the car was cammed. Modeled my build up after a Lingenfelter TPI motor.