Welcome to Mustang Evolution.
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02-20-2007, 04:29 PM
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#1
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Under drive pulleys, should I or shouldn't I?
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Registered User
Join Date: Aug 2006
City: Orlando
State: Florida
Posts: 22
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I have an 03 GT with 4.6, off road x pipe, flow master 40's, 3.73 gear, mhw shifter, bbk cold air kit,
I have been thinking about getting under drive pulleys before I have the dyno tune done. I drive the car on the street and on long trips from time to time. I live in the middle of Florida.
I have had two speed shops tell me not to get them.
What do you people think?
Thanks in Advance |
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02-20-2007, 04:35 PM
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#2
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Re: Under drive pulleys, should I or shouldn't I?
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#2 (I Wish I Could Lope Like A tC)
Join Date: Apr 2006
City: Pineville/Alexandria
State: Louisiana
Posts: 1,265
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Do you have alot of accsessories... System or anything that would use more battery than normal?
__________________
(Project "TORQUE")
Mods - Off Road H w/ Flowmaster 40s and 3" x 22" Tips, Shiftkit, Shorties, and 4.10s
Soon to come - UDPs, Off Road X-Pipe, A/T Cooler, and 03' Cobra Rims
Club - Tha Crew Leader of Muscle Car Division
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02-20-2007, 05:27 PM
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#3
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Re: Under drive pulleys, should I or shouldn't I?
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Resident A$$hole
Join Date: Apr 2006
City: Columbus
State: Mississippi
Posts: 2,478
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What he said. We have pullies, but don't have a kickin stereo, and also spends a lot of time at higher rpm since it's highway all the way to work. If you are in stop in go alot, charging the battery might be a problem.
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01 Bullitt
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02-20-2007, 05:38 PM
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#4
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Re: Under drive pulleys, should I or shouldn't I?
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WTF^^...
Join Date: May 2003
City: Hoover / Florence
State: Alabama
Posts: 27,126
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I never had any issues with a crank only under drive (25%) dont expect much from them as with any bolt on but ... they do help gas milage a tad.
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2003 REDFIRE COBRA #3938 of 5082 @ 05/27/2003 1 of 414
MGW Shifter, Stingers, JLT, SS Inserts, MM FLSFC & CC Plates, SS Lines, H&R Race springs, IRS Brace, MRT Hood Struts
ME.com Member #29 - 400rwhp/380rwtq
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02-21-2007, 02:51 PM
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#5
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Re: Under drive pulleys, should I or shouldn't I?
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Sometimes I feel Like a Nut!
Join Date: Jul 2003
State: Connecticut
Posts: 8,504
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I dont know why everyone says they effect the battery and charging cause i had a UDP on my old V6 ontop of a system that was pushing 2 1000.1 amps to my subs and never once did it make a differ.
On an older car it does but not on newer cars.
I say go for it I noticed a differ when i put mine on not much but just enough
__________________
 1989 5.0 - Mustang Brandy the NOW It can Barely Idle B**ch  1999 Jeep Cherokee Sport 4.0 - Yeah Its Gotta Baby Dick Lift |
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03-01-2007, 12:00 AM
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#6
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Re: Under drive pulleys, should I or shouldn't I?
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The Internet Badass
Join Date: Feb 2007
City: St Louis
State: Missouri
Posts: 818
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I to have had no problems and i have a system but the only thing it helps is the car revs and drops revs a bit quicker as long as you get the lightwieght underdrive crank pulley. Gas mileage does increase a bit
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03 GT silver, bbk intake, march underdrive crank pulley, cat delete, spec stage2 clutch, spec lightweight flywheel, catless x-pipe, short throw shifter.
I don't condone stupidity i promote it
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03-01-2007, 12:15 AM
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#7
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Re: Under drive pulleys, should I or shouldn't I?
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Registered User
Join Date: Jul 2006
City: Allentown
State: Pennsylvania
Posts: 1,139
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^ how do you have a profile for your stang but dont have any pictures in it?? come on man. lol. i went to a shop once and asked about a whole bunch of performance mods when i was still learnin what to/not to do with the 6er. the shop owner/top mechanic said that he always told ppl to stay away from them and he also said that if a car came in with ud pulleys, he would take them off of the persons car and put stocks back on. how gay is that. im like yea and you wanna do work on my car. lol. so, i have always been told not to put ud pulleys on cuz the gains arent worth the possible negatives. just thought id share.
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03-01-2007, 12:19 AM
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#8
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Re: Under drive pulleys, should I or shouldn't I?
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The Internet Badass
Join Date: Feb 2007
City: St Louis
State: Missouri
Posts: 818
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i just joined the site havent loaded any yet and ive heard nothing but good ive never heard anything bad about them
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03 GT silver, bbk intake, march underdrive crank pulley, cat delete, spec stage2 clutch, spec lightweight flywheel, catless x-pipe, short throw shifter.
I don't condone stupidity i promote it
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03-01-2007, 12:22 AM
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#9
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Re: Under drive pulleys, should I or shouldn't I?
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LS THIS
Join Date: May 2006
City: bristol
State: Tennessee
Posts: 520
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I've heard alot of bad about them but i dont have any issues same battery has been on my car since i bought it over a year ago. |
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03-01-2007, 12:23 AM
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#10
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Re: Under drive pulleys, should I or shouldn't I?
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The Internet Badass
Join Date: Feb 2007
City: St Louis
State: Missouri
Posts: 818
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__________________
03 GT silver, bbk intake, march underdrive crank pulley, cat delete, spec stage2 clutch, spec lightweight flywheel, catless x-pipe, short throw shifter.
I don't condone stupidity i promote it
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03-01-2007, 12:26 AM
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#11
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Re: Under drive pulleys, should I or shouldn't I?
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LS THIS
Join Date: May 2006
City: bristol
State: Tennessee
Posts: 520
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They cause over heating issues,charging issues etc. i dont care what people say my car is living proof its BS for the simple fact i beat the living shit out of the motor and i have yet too have it overheat or a dead battery. |
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03-01-2007, 12:30 AM
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#12
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Re: Under drive pulleys, should I or shouldn't I?
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The Internet Badass
Join Date: Feb 2007
City: St Louis
State: Missouri
Posts: 818
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__________________
03 GT silver, bbk intake, march underdrive crank pulley, cat delete, spec stage2 clutch, spec lightweight flywheel, catless x-pipe, short throw shifter.
I don't condone stupidity i promote it
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03-01-2007, 03:13 PM
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#13
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Re: Under drive pulleys, should I or shouldn't I?
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Registered User
Join Date: Dec 2006
Posts: 96
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No problems here and ive had mine for about 6 months now and i have a system
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00 Mustang GT: Upr x-pipe,Magnaflow Cat-back, MAC intake with 60mm mass air, underdrive pulleys, 3:73, and tuned
01 CBR RR: Full Erion exhaust, power commander, and intake
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03-01-2007, 03:57 PM
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#14
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Re: Under drive pulleys, should I or shouldn't I?
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^needs more bondo
Join Date: Sep 2003
City: Modesto
State: California
Posts: 9,575
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I have the march piggybacks and never any issues. Theyre what, 150$, theyre a pita to install, and they give you zero sotp gains. so yeah, if they werent such a pain id uninstall them and sell them off, but im lazy so ill just leave them on for now. but yeah, in retrospect, i wouldnt do them again if i ever got another car.
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-Thomas-
2003 Redfire Cobra "Ruby" - Mine Again!
1990 Eclipse GSX - Project "What the Hell is that clunking noise and where did my power steering go?!"
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03-08-2007, 06:23 AM
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#15
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Re: Under drive pulleys, should I or shouldn't I?
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Registered User
Join Date: Oct 2006
City: Atlanta
State: Georgia
Posts: 99
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OK, I've heard pros and cons with most of your guys' stangs but what about with mine. I have a Saleen supercharger and no system. What it be worth my money to get them?
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 Saleen #232
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03-08-2007, 10:27 AM
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#16
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Re: Under drive pulleys, should I or shouldn't I?
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Sometimes I feel Like a Nut!
Join Date: Jul 2003
State: Connecticut
Posts: 8,504
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i personally thought it was worth it. I noticed a difference when I put them in
__________________
1989 5.0 - Mustang Brandy the NOW It can Barely Idle B**ch 1999 Jeep Cherokee Sport 4.0 - Yeah Its Gotta Baby Dick Lift |
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03-09-2007, 12:00 PM
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#17
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Re: Under drive pulleys, should I or shouldn't I?
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Registered User
Join Date: Feb 2005
City: Delray Beach
State: Florida
Posts: 339
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I had the crank UDP and the alternator pulley as well when I had the air ride on. I had issues with that because the compressor would draw off the battery and with the smaller pulley for the alternator the charging system wasnt able to keep up so I did have to replace my battery later. I took them off when I took off the air ride but I put the crank UDP on only again. Acceleration is a tad bit quicker as well as the RPMs and I was able to rev higher between shifts. I havent had any problems with just the UDP so I think its worth it.
~Jon~
__________________
Sinister Six 1998 3.8L V6
Done So Far:
~CAI, True dual exhaust, UDPs, MGW Shifter, H&R springs, Stage 1 & 2 supension kit, performance rotors & pads, steel braided lines, 1 inch rear spacers, A.R. Rebel 17x9s with BFG rubber! 
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03-09-2007, 12:52 PM
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#18
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Re: Under drive pulleys, should I or shouldn't I?
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Deranged
Join Date: Jan 2005
City: Largo
State: Florida
Posts: 6,159
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__________________
Mods-MAc CAI , True Dual Flowmaster 40,3.73 ,T-Lok, 25% UDP, 3/8 Phenolic Intake Spacer ,Steeda Tri-ax, SCT Chip/ Tune
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03-09-2007, 03:07 PM
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#19
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Re: Under drive pulleys, should I or shouldn't I?
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Bob is Good.
Join Date: Jun 2004
City: Greenville
State: Texas
Posts: 5,172
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I'd say buy a crank pulley and leave it at that. I started out with an entire set, but eventually took off the alternator and water pump pulleys due to various issues.
The crank pulley is definitely worth it though in my opinion. Pretty cheap for the gains. |
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03-09-2007, 03:15 PM
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#20
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Re: Under drive pulleys, should I or shouldn't I?
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Imma Ho...
Join Date: Aug 2004
City: Baton Rouge
State: Louisiana
Posts: 9,957
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No, do not get them. If you were N/A like most of the people here, I would say definitely get them. Being blown, do not get them. While they may work out just fine, there is no sense in slowing down your water pump and risking any heat related issues. The gains are not worth the risk in my opinion.
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