Underdrive Pulley

[babydumpling]

I guess it has been talked about before but I am looking for info on HP and MPG gains on installing a 20% crankshaft pulley on a 96 Ranger 3.0 with 3.73 rear. I am looking at the ASP pulley because it is aluminum which will give me torque advantage over a heavy steel one. I have not found any other pulleys for this model. They list theirs at full charge at 850 RPM? Would I need to find an alternator pulley to keep my RPMs down at idle? Does anyone make pulleys for this model? I have done exhaust/air intake mods and am looking to increase fuel mileage.

 

[disciplerocks]

Don't waste your money. Please.

 

[adsm08]

Your flywheel weighs at least 10 lbs. Your crank pulley might weigh 3, if it's a "heavy steel one".

Explain to me the cost/benefit ratio of dropping weight off the crank pulley again. When I did the math that just sounded stupid.

 

[buckshotmudder]

Don't waste your money. Please.

This^^^^^

Underdrive pulleys are only beneficial at or near redline, hence the reason NASCAR uses them. They are turning 8000 plus rpm.s for hours at a time. Are you gonna be driving your 96 at redline for hours at a time? No.

 

[Rearanger]

I am looking for info on HP and MPG gains on installing a 20% crankshaft pulley

Best you'll get here is butt-dyno opinions. Why don't you log several months of mileage averages before and after then let us know.