Underdrive pulleys
Thread Starter
2nd Gear Member
Joined: Sep 2005
Posts: 307
From: NY
Underdrive pulleys
i want to buy an underdrive pulley set, they are fairly cheap.
what are the advantages of underdrive pulleys... and the set i want comes with 3 pulleys, what are they for and what belt do i need to get once installed
what are the advantages of underdrive pulleys... and the set i want comes with 3 pulleys, what are they for and what belt do i need to get once installed
4th Gear Member
Joined: Apr 2005
Posts: 1,036
From:
RE: Underdrive pulleys
He's right. 
It makes the water pump and alternator pulleys bigger, and the crank pulley smaller. Kind of like lightening the load on the engine. There are no disadvantages to them, unless you plan on supercharging it. In that case you actually lose boost. If you plan on supercharging your car, I wouldn't get the pulleys. In my case I didn't need a new belt after having them installed.
It makes the water pump and alternator pulleys bigger, and the crank pulley smaller. Kind of like lightening the load on the engine. There are no disadvantages to them, unless you plan on supercharging it. In that case you actually lose boost. If you plan on supercharging your car, I wouldn't get the pulleys. In my case I didn't need a new belt after having them installed.
5th Gear Member
Joined: Feb 2004
Posts: 2,028
From:
RE: Underdrive pulleys
Don't buy piggyback pulleys.To retain the harmonic balancer you bolt the stock balancer to the new crank pulley.Steeda and March both offer the SFI approved non piggyback set.Remember to remove the washer under the bolt on the old crank pulley and to use a good bead of RTV in the keyway when installing the new crank pulley.
Thread Starter
2nd Gear Member
Joined: Sep 2005
Posts: 307
From: NY
RE: Underdrive pulleys
ORIGINAL: Chopper
Don't buy piggyback pulleys.To retain the harmonic balancer you bolt the stock balancer to the new crank pulley.Steeda and March both offer the SFI approved non piggyback set.Remember to remove the washer under the bolt on the old crank pulley and to use a good bead of RTV in the keyway when installing the new crank pulley.
Don't buy piggyback pulleys.To retain the harmonic balancer you bolt the stock balancer to the new crank pulley.Steeda and March both offer the SFI approved non piggyback set.Remember to remove the washer under the bolt on the old crank pulley and to use a good bead of RTV in the keyway when installing the new crank pulley.
these guys on ebay sell all mustang parts and havent had anything bad said about them....
what do you guys think of these pullies? and how much would steeda pully set run if i needed to go with them
Thread Starter
2nd Gear Member
Joined: Sep 2005
Posts: 307
From: NY
RE: Underdrive pulleys
actually i just looked on steeda.com and the pully set is 100 bucks, might as well do that instead of paying 80 for some knock off,
i see steeda has a 3" racing crank pulley that you can buy by itself... is that how big the crank pully is in the underdrive set?
i see steeda has a 3" racing crank pulley that you can buy by itself... is that how big the crank pully is in the underdrive set?
Thread Starter
2nd Gear Member
Joined: Sep 2005
Posts: 307
From: NY
RE: Underdrive pulleys
ORIGINAL: Tim37
you probably don't want a 3" underdrive pulley thats gonna be best for a car turnning serious RPM on a open track or getting the battery charged inbetween rounds at a drag strip.
you probably don't want a 3" underdrive pulley thats gonna be best for a car turnning serious RPM on a open track or getting the battery charged inbetween rounds at a drag strip.
alright thats good info...... im actually worried about the alternator frying if i get an underdrive set, my friend said get a 130 amp alternator from a 94-95 gt and splice it in then mabey ill do the pulleys