Black2001GT
Founding Member
Are Underdrive pulleys worth buying?
- Thread starter BLaCk-40th
- Start date
If you are thinking about pullies here is some advice from www.bullittarchive.com
Under drive pulleys
Selling points
* More of the engine power is available by using driving the accessories at a slower rate than normal.
Things to consider
* The vehicle is engineered to work from the AZ desert to sub zero temps in the northern states. Perhaps you are able to slow your water pump and alternator down with out a problem. Just remember that the entire cooling system was engineered on how much heat your engine makes, how much HP it produces.
* If you start adding power modifiers AND under drive the accessories, this may be a recipe for problems later.
* If you find your self mainly making a lot of short trips and idling for extended a period of time, then under driving your alternator may be a problem later also.
ALSO:
14520
4.6L Pulley Instructions
Some 1996-2001 Mustang owners, for engine performance purposes, are adding a special front drive pulley kit to reduce front accessory drive speeds. When removing and replacing the crank pulley, if the large bolt used to hold the crank pulley undertorqued, the keyway will shear and cause major engine damage. The resulting engine damage is not warrantable. If the crankshaft pulley bolt is removed it should be replaced as it is a torque to yield bolt. The installation of the crankshaft pulley requires that a specific torque operation be adhered to. The crankshaft pulley bolt must be installed using these 4 steps: 1) Torque to 75 lbs/ft 2) Back out one turn 3) torque to 45 lb?ft 4) continue to tighten and additional 90 degrees.
Under drive pulleys
Selling points
* More of the engine power is available by using driving the accessories at a slower rate than normal.
Things to consider
* The vehicle is engineered to work from the AZ desert to sub zero temps in the northern states. Perhaps you are able to slow your water pump and alternator down with out a problem. Just remember that the entire cooling system was engineered on how much heat your engine makes, how much HP it produces.
* If you start adding power modifiers AND under drive the accessories, this may be a recipe for problems later.
* If you find your self mainly making a lot of short trips and idling for extended a period of time, then under driving your alternator may be a problem later also.
ALSO:
14520
4.6L Pulley Instructions
Some 1996-2001 Mustang owners, for engine performance purposes, are adding a special front drive pulley kit to reduce front accessory drive speeds. When removing and replacing the crank pulley, if the large bolt used to hold the crank pulley undertorqued, the keyway will shear and cause major engine damage. The resulting engine damage is not warrantable. If the crankshaft pulley bolt is removed it should be replaced as it is a torque to yield bolt. The installation of the crankshaft pulley requires that a specific torque operation be adhered to. The crankshaft pulley bolt must be installed using these 4 steps: 1) Torque to 75 lbs/ft 2) Back out one turn 3) torque to 45 lb?ft 4) continue to tighten and additional 90 degrees.
myponyrocks
I have more billet on the Stang than most women ha
- Apr 18, 2004
- 1,219
- 0
- 37
streetstang03 said:i never could understand paying 200 for ~5hp.or spending 500+ for a plenum and getting 8hp
Great everything on my car is a waste of money then.
I HAD them but pulled them off...sitting in my junk bin in the utility room. It remains to be seen but I had charging problems and went thru 2 batteries and 2 alternators while they were on. I'll wait a while longer since I'm running without them for 6 months now to form an opinion on whether removing them has fixed my problem. I didn't go into detail on WHY since I only stated I felt they were a waste for just a few HP and a tenth at the track.Black2001GT said:
The TB and plenum are a toss-up too. I only paid 225 for my set-up (used) so i really don't have a problem with there not giving me any gains. I guess I could put the stock stuff back on to dyno them again with the new.
Similar threads
