underdrive pullys?

91cobra5.0 · February 20th, 2008, 09:56 AM

what do they accomplish?

Speedstang302 · February 20th, 2008, 09:57 AM

about 5hp..by making it so the accessorys dont take as much horse...so ur freeing up HP...but some people notice charge problems when u use the alternator one..for about $100..5hp to me aint worth it..find some used ones for like $40..

91cobra5.0 · February 20th, 2008, 09:58 AM

Originally Posted by Speedstang302

about 5hp..by making it so the accessorys dont take as much horse...so ur freeing up HP...but some people notice charge problems when u use the alternator one..for about $100..5hp to me aint worth it..find some used ones for like $40..

agree on the used part, why would the alternator have trouble charging? is the pully bigger?

Speedstang302 · February 20th, 2008, 10:01 AM

yeah the underdrive pullys are bigger pullys...so it spins slower taking up less hp front the motor..and spinning slower makes the alternator not charge as well..as long as you dont have a crazy sound system ur fine..

Iwannagofast · February 20th, 2008, 10:39 AM

and you can get a set new for 50 bucks on summit......they arent aluminim though

86_Notch · February 20th, 2008, 11:21 AM

you can expect anywhere from 8 - 12 hp and for 50 bucks i think they're worth it

Speedstang302 · February 20th, 2008, 12:49 PM

Originally Posted by Iwannagofast

and you can get a set new for 50 bucks on summit......they arent aluminim though

yeah there steel

Originally Posted by 86_notch

you can expect anywhere from 8 - 12 hp and for 50 bucks i think they're worth it

i doubt people see even the low side of that range...you probably get more horse from switching to synthetic oils...

86_Notch · February 20th, 2008, 01:17 PM

i used to be skeptical as a matter of fact i don't buy into cold air kits and ram air but i once got a set of pulleys for 20 bucks from a guy ( brand new but never used ) so i put them on a 5.0 i used to have and while i never had it dynoed the motor revved much easier and accelerated noticibly quicker and easier

91cobra5.0 · February 20th, 2008, 01:40 PM

wait with a bigger pully it revs easier? shouldnt that make everything spin slower?

Juggalo_X · February 20th, 2008, 01:41 PM

Originally Posted by 91cobra5.0

wait with a bigger pully it revs easier? shouldnt that make everything spin slower?

its lighter and spins the accessories slower which creates less engine drag.

86_Notch · February 20th, 2008, 01:49 PM

smaller crank pulley + larger alt and water pump pulley = spinning the accesories slower which frees up power, plus it will help the alt and water pump live longer

izze01 · February 20th, 2008, 02:05 PM

I have them and yes u can see the battery and lights dim down when u are at idle so if u are running a sound system (i.e. subs with an amp) then u will want to take them out or put the amp on a switch just so it doesnt drain everything out of the battery.

Speedstang302 · February 20th, 2008, 02:09 PM

Originally Posted by izze01

I have them and yes u can see the battery and lights dim down when u are at idle so if u are running a sound system (i.e. subs with an amp) then u will want to take them out or put the amp on a switch just so it doesnt drain everything out of the battery.

or just not run the pully for the altanator

tehdwarvenn · February 20th, 2008, 02:25 PM

but if you have 2 blue pulleys, you need the 3rd one! its just not right skipping out like that. 66% is a F in my expirience. =)

Iwannagofast · February 20th, 2008, 02:34 PM

or just upgrade to like a 3g 150 amp alternator

Speedstang302 · February 20th, 2008, 02:36 PM

Originally Posted by tehdwarvenn

but if you have 2 blue pulleys, you need the 3rd one! its just not right skipping out like that. 66% is a F in my expirience. =)

um..you suck...im pretty sure i'd rather my alt fully charging my battery so i know it will start all the time rather than be slightly less charging at make .5hp more!!!!

Speedstang302 · February 20th, 2008, 02:37 PM

Originally Posted by Iwannagofast

or just upgrade to like a 3g 150 amp alternator

and that pully basically makes it a 90amp alt

izze01 · February 20th, 2008, 03:09 PM

Ehh mine is fine I have a red top battery and I have never needed a jump from anyone since the pulleys.

tehdwarvenn · February 20th, 2008, 03:38 PM

speedstang.. ive had these pulleys for a while, dont even have that good of a battery, i can idle with headlights/ foglights on for 10 min, turn car off, and turn it back on, no problem. (ive never had any reason to stay in one spot for more than 10 min O_o)

edit: although if you have an electric fan and waterpump, i dont think this is a good idea at all.. thoughtd id add that.

Speedstang302 · February 20th, 2008, 04:28 PM

well i have electric fan and more of a motor to start up..i have an optima red top along with stock alternator...and dont have my underdrive pullie on there and i still cant even keep a charge...and my starter solenoids new, so arent all my battery cables and grounds are all clean..so idk

February 20th, 2008, 09:56 AM	#1
91cobra5.0 Hardcore Enthusiast 98 Cobra Join Date: Jan 2008 Location: Bay Area, Ca Posts: 2,057 iTrader: 0 reviews	underdrive pullys? what do they accomplish?

February 20th, 2008, 09:57 AM	#2
Speedstang302 I Post Entirely Way Too Much 1996 Mustang GT 13.64@101mph Join Date: Apr 2007 Location: Massachusetss Posts: 5,828 iTrader: 1 reviews	about 5hp..by making it so the accessorys dont take as much horse...so ur freeing up HP...but some people notice charge problems when u use the alternator one..for about $100..5hp to me aint worth it..find some used ones for like $40.. __________________ 1990 GT- GT40p Heads\| Anderson N41 cam\| Crane 1.6 RR's\| Trickflow Intake\|MGW Short Throw\| Aluminum d/s\| 3.73's.....still slow....

February 20th, 2008, 10:01 AM	#4
Speedstang302 I Post Entirely Way Too Much 1996 Mustang GT 13.64@101mph Join Date: Apr 2007 Location: Massachusetss Posts: 5,828 iTrader: 1 reviews	yeah the underdrive pullys are bigger pullys...so it spins slower taking up less hp front the motor..and spinning slower makes the alternator not charge as well..as long as you dont have a crazy sound system ur fine.. __________________ 1990 GT- GT40p Heads\| Anderson N41 cam\| Crane 1.6 RR's\| Trickflow Intake\|MGW Short Throw\| Aluminum d/s\| 3.73's.....still slow....

February 20th, 2008, 02:25 PM	#14
tehdwarvenn Regular Join Date: May 2007 Location: Columbia SC Posts: 301 iTrader: 0 reviews	but if you have 2 blue pulleys, you need the 3rd one! its just not right skipping out like that. 66% is a F in my expirience. =) __________________ 1993 Mustang GT, catless h-pipe, bbk shorties, 40 series flows, bbk rear suspension, edelbrock front suspension, AUTOLITES!!! =), k&n, underdrives, 3.73's

February 20th, 2008, 03:38 PM	#19
tehdwarvenn Regular Join Date: May 2007 Location: Columbia SC Posts: 301 iTrader: 0 reviews	speedstang.. ive had these pulleys for a while, dont even have that good of a battery, i can idle with headlights/ foglights on for 10 min, turn car off, and turn it back on, no problem. (ive never had any reason to stay in one spot for more than 10 min O_o) edit: although if you have an electric fan and waterpump, i dont think this is a good idea at all.. thoughtd id add that. __________________ 1993 Mustang GT, catless h-pipe, bbk shorties, 40 series flows, bbk rear suspension, edelbrock front suspension, AUTOLITES!!! =), k&n, underdrives, 3.73's Last edited by tehdwarvenn; February 20th, 2008 at 03:39 PM. Reason: electric

February 20th, 2008, 11:21 AM	#6
86_Notch Hardcore Enthusiast 1986 lx notch 9.98 @ 135 Join Date: Mar 2007 Location: Delaware Posts: 1,522 iTrader: 0 reviews	you can expect anywhere from 8 - 12 hp and for 50 bucks i think they're worth it

February 20th, 2008, 01:17 PM	#8
86_Notch Hardcore Enthusiast 1986 lx notch 9.98 @ 135 Join Date: Mar 2007 Location: Delaware Posts: 1,522 iTrader: 0 reviews	i used to be skeptical as a matter of fact i don't buy into cold air kits and ram air but i once got a set of pulleys for 20 bucks from a guy ( brand new but never used ) so i put them on a 5.0 i used to have and while i never had it dynoed the motor revved much easier and accelerated noticibly quicker and easier

February 20th, 2008, 01:40 PM	#9
91cobra5.0 Hardcore Enthusiast 98 Cobra Join Date: Jan 2008 Location: Bay Area, Ca Posts: 2,057 iTrader: 0 reviews	wait with a bigger pully it revs easier? shouldnt that make everything spin slower?

February 20th, 2008, 01:49 PM	#11
86_Notch Hardcore Enthusiast 1986 lx notch 9.98 @ 135 Join Date: Mar 2007 Location: Delaware Posts: 1,522 iTrader: 0 reviews	smaller crank pulley + larger alt and water pump pulley = spinning the accesories slower which frees up power, plus it will help the alt and water pump live longer

February 20th, 2008, 02:05 PM	#12
izze01 Regular 1994, mustang gt N/A Join Date: Dec 2006 Location: Clarksville Posts: 292 iTrader: 0 reviews	I have them and yes u can see the battery and lights dim down when u are at idle so if u are running a sound system (i.e. subs with an amp) then u will want to take them out or put the amp on a switch just so it doesnt drain everything out of the battery.

February 20th, 2008, 03:09 PM	#18
izze01 Regular 1994, mustang gt N/A Join Date: Dec 2006 Location: Clarksville Posts: 292 iTrader: 0 reviews	Ehh mine is fine I have a red top battery and I have never needed a jump from anyone since the pulleys.

February 20th, 2008, 04:28 PM	#20
Speedstang302 I Post Entirely Way Too Much 1996 Mustang GT 13.64@101mph Join Date: Apr 2007 Location: Massachusetss Posts: 5,828 iTrader: 1 reviews	well i have electric fan and more of a motor to start up..i have an optima red top along with stock alternator...and dont have my underdrive pullie on there and i still cant even keep a charge...and my starter solenoids new, so arent all my battery cables and grounds are all clean..so idk __________________ 1990 GT- GT40p Heads\| Anderson N41 cam\| Crane 1.6 RR's\| Trickflow Intake\|MGW Short Throw\| Aluminum d/s\| 3.73's.....still slow....

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