Underdrive pully ?
12-28-2009, 09:13 PM
#3
4th Gear Member
Join Date: Nov 2009
Location: SoCal
Posts: 1,826
Look down at your crank pulley.... If it looks like there's two of them stuck together (larger one toward the front of the car, belt running on the smaller inside pulley closest to the engine), then yes; those are usually referred to as "piggyback" style. Or if it's by itself and has any little colored lines/marks on the outer edge of the face of it then probably yes, as well. A few of the more expensive brands, like Steeda, sell theirs with a new crankshaft dampener that replaces the factory one altogether. I have udp's on my car, so can't help you with the stock ones diameters.
12-28-2009, 10:02 PM
#5
4th Gear Member
Join Date: Sep 2009
Location: Michigan
Posts: 1,830
does the car have any other noticeable mods done to it? if not, id bet it doesnt... seems like someone wouldnt do just pulleys on their car. although i could be wrong.
and ya, what all of the above have said.
and ya, what all of the above have said.
12-28-2009, 10:40 PM
#6
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
The OEM harmonic dampener is 7" diameter, the actual pulley has a 6.5" working diameter. I have the Steeda UDPs on my '03, and the harmonic balancer is 5.25" diameter with a working pulley diameter of 4.875".
My brother has Steeda's UDPs for his '99 GT and the dampener is a bit larger than mine, perhaps 5.75" OD, they pulley seems about the same.
My brother has Steeda's UDPs for his '99 GT and the dampener is a bit larger than mine, perhaps 5.75" OD, they pulley seems about the same.
12-29-2009, 02:41 PM
#7
Thread Starter
Join Date: Dec 2009
Location: Missouri
Posts: 6
Thank you all for the info, I guess I should have been more specific so I will give a little detail about myself and the car.
This is my 4th mustang, my others were a 91 lx 5.0, 95 GT, 06 Gt and now this one. The 91 was for drag racing only, my ex wife made me sell it when we moved, the 95 I sold it and the 06 I sold do to the economy and my job. So now I have bought this one, it has only 39,000 miles on it and came out of florida, who ever had it installed a new throttle body and cold air kit, 4.10 gears and flow master exhaust.
Since I havent toyed around with mustangs in a while I dont know crap about this 2valve motor and have no idea if they had installed the underdrive pullies or not and didnt want to buy them if they were already on there.
So once again thank you all for the info and if there is anything else you would like to share with me about this motor as far as getting more bang for your buck and I dont want Nitrous (been there done that with 91) I would appreciate it. But I do plan on purchasing the Hellion twin turbo kit in the near future so if you would like to comment on that feel free.
This is my 4th mustang, my others were a 91 lx 5.0, 95 GT, 06 Gt and now this one. The 91 was for drag racing only, my ex wife made me sell it when we moved, the 95 I sold it and the 06 I sold do to the economy and my job. So now I have bought this one, it has only 39,000 miles on it and came out of florida, who ever had it installed a new throttle body and cold air kit, 4.10 gears and flow master exhaust.
Since I havent toyed around with mustangs in a while I dont know crap about this 2valve motor and have no idea if they had installed the underdrive pullies or not and didnt want to buy them if they were already on there.
So once again thank you all for the info and if there is anything else you would like to share with me about this motor as far as getting more bang for your buck and I dont want Nitrous (been there done that with 91) I would appreciate it. But I do plan on purchasing the Hellion twin turbo kit in the near future so if you would like to comment on that feel free.
12-29-2009, 02:52 PM
#8
6th Gear Member
Join Date: Jan 2007
Location: MI
Posts: 5,884
Thank you all for the info, I guess I should have been more specific so I will give a little detail about myself and the car.
This is my 4th mustang, my others were a 91 lx 5.0, 95 GT, 06 Gt and now this one. The 91 was for drag racing only, my ex wife made me sell it when we moved, the 95 I sold it and the 06 I sold do to the economy and my job. So now I have bought this one, it has only 39,000 miles on it and came out of florida, who ever had it installed a new throttle body and cold air kit, 4.10 gears and flow master exhaust.
Since I havent toyed around with mustangs in a while I dont know crap about this 2valve motor and have no idea if they had installed the underdrive pullies or not and didnt want to buy them if they were already on there.
So once again thank you all for the info and if there is anything else you would like to share with me about this motor as far as getting more bang for your buck and I dont want Nitrous (been there done that with 91) I would appreciate it. But I do plan on purchasing the Hellion twin turbo kit in the near future so if you would like to comment on that feel free.
This is my 4th mustang, my others were a 91 lx 5.0, 95 GT, 06 Gt and now this one. The 91 was for drag racing only, my ex wife made me sell it when we moved, the 95 I sold it and the 06 I sold do to the economy and my job. So now I have bought this one, it has only 39,000 miles on it and came out of florida, who ever had it installed a new throttle body and cold air kit, 4.10 gears and flow master exhaust.
Since I havent toyed around with mustangs in a while I dont know crap about this 2valve motor and have no idea if they had installed the underdrive pullies or not and didnt want to buy them if they were already on there.
So once again thank you all for the info and if there is anything else you would like to share with me about this motor as far as getting more bang for your buck and I dont want Nitrous (been there done that with 91) I would appreciate it. But I do plan on purchasing the Hellion twin turbo kit in the near future so if you would like to comment on that feel free.
10-29-2015, 05:20 PM
#9
1st Gear Member
Join Date: Aug 2009
Location: pa.
Posts: 64
diameter confusion?
The OEM harmonic dampener is 7" diameter, the actual pulley has a 6.5" working diameter. I have the Steeda UDPs on my '03, and the harmonic balancer is 5.25" diameter with a working pulley diameter of 4.875".
My brother has Steeda's UDPs for his '99 GT and the dampener is a bit larger than mine, perhaps 5.75" OD, they pulley seems about the same.
My brother has Steeda's UDPs for his '99 GT and the dampener is a bit larger than mine, perhaps 5.75" OD, they pulley seems about the same.
stock pulleys.my harmonic balancer is 4.75'' with a pulley diameter of 4.25''.
my water pump pulley is 6.25''.and alt. pulley is 2.5''.the pulleys were on
the car when i bought it.i dont see any markings on them.thanks in advance
10-29-2015, 05:48 PM
#10
TECH SAVANT
Join Date: Dec 2006
Location: Saint Augustine, FL
Posts: 10,938
hi cliffyk,could you tell me what i have,i think i have something other than
stock pulleys.my harmonic balancer is 4.75'' with a pulley diameter of 4.25''.
my water pump pulley is 6.25''.and alt. pulley is 2.5''.the pulleys were on
the car when i bought it.i dont see any markings on them.thanks in advance
stock pulleys.my harmonic balancer is 4.75'' with a pulley diameter of 4.25''.
my water pump pulley is 6.25''.and alt. pulley is 2.5''.the pulleys were on
the car when i bought it.i dont see any markings on them.thanks in advance
