Underdrive pulley

firefly1241 · December 6th, 2006, 03:39 PM

looking to pick up an underdrive pulle kit for my 1992 gt havent looked to hard to find one yer was wondering wat are some good sites you guys use for parts also what a grood brand of pulleys would be ?

Darrell · December 6th, 2006, 04:34 PM

Summit. March or BBK underdrive pulleys are good. There are alot of other good ones out there too.

firefly1241 · December 6th, 2006, 04:38 PM

srry for the serious masacre in my last post lol. but anyways i was looking at some bbk steel underdrive pulleys, I was going to get there steel kind since they should be built stronger but idk for sure. Aluminum is light and may give me a better take off even if it is a hair of a second what are your guys ideas?

TENGRAM · December 6th, 2006, 05:33 PM

the difference in weight is so minimal i don't think it would make a difference either way. for something as simple as underdrive pulleys, just buy the cheapest ones you can find. mine were made by CAT...never heard of them? me neither, but they were $40 and do the job as well as any

Tony_90fox · December 6th, 2006, 05:41 PM

i got my pullies at a UPR table at a swap meet for the NMRA. I dont think they make pullies though, or at least i havent been able to find them if they do. anyway, whatever brand they were, they cost $80.

82GT · December 6th, 2006, 06:20 PM

You can usualy find a cheap set on Ebay

cobraetti · December 6th, 2006, 06:37 PM

I got the BBK steel from CJPONYPARTS.COM($80.00), the only thing I might be aware of was that when I used the alt. pulley it greatly reduced the output of my alt.. So I went back with the stock Alt. pulley :sleep

firefly1241 · December 6th, 2006, 10:09 PM

so if i go with them keep the stock alt pulley ??? or was that just in your case 89 ragtop ?

Tony_90fox · December 6th, 2006, 11:11 PM

some people have had problems so they go with a 130 amp alternator....that should keep it charging well. Get one off a taurus or buy it new.

firefly1241 · December 6th, 2006, 11:21 PM

how much off a taurus u think and what year ???

cobraetti · December 7th, 2006, 07:23 PM

Yes in my case it benefited me to reinstall the factory ALT. pulley(lights were going dim at idle). you can see if this is the case with yours

shurb125 · December 7th, 2006, 09:52 PM

Just put a set ot BBK on my 93 covert Wednesday, haven't had any problems thus far, and as far as the alt pulley the new BBK was actually slightly bigger than the original but I still put it on anyways.

turbong · December 8th, 2006, 11:30 AM

Well personally I would like to see a test done to see if there is a difference. In theory rotating mass weighs more then stationary mass. For example 1lb weights 1lb, but a 1lb pulley rotating at X speed then it now weighs 1.3 lbs. Not 100% sure on formula. So you would be gaining on loss of weight but how much is the real question. I do say the billet pulleys are better since they would never rust or need painted. And the cost isn’t that big of difference 50 compared to 80….

TENGRAM · December 8th, 2006, 02:42 PM

Originally Posted by turbong

Well personally I would like to see a test done to see if there is a difference. In theory rotating mass weighs more then stationary mass. For example 1lb weights 1lb, but a 1lb pulley rotating at X speed then it now weighs 1.3 lbs. Not 100% sure on formula. So you would be gaining on loss of weight but how much is the real question. I do say the billet pulleys are better since they would never rust or need painted. And the cost isn’t that big of difference 50 compared to 80….

i'd like to see that test too, even if it only uncovers a 1 or 2 hp difference. when i bought my pulleys from Dallas Mustang, they actually tried to tell me that the aluminum pulleys, with their lighter rotational weight, would cause a loss of engine momentum between shifts, and thusly slightly less performance...sounded like some BS at the time, but seems worth noting in this discussion

turbong · December 8th, 2006, 03:02 PM

Yes and no at the same time! The rotating mass (weight) helps you only when launching the car from a slow roll or a complete stop. For example pick up a bucket of water and throw it as far as you can with out spinning it around first. Then using the same amount of water in the same bucket twirl the bucket around and around like a helicopter and then release it. The second throw will travel much further. I had an AWD Eclipse and with the stock fly wheel I could launch the car at 3k RPMs but when I put on an aluminum flywheel I lost the ability to launch the car at 3k, I had to at 5-6k RPMs.
(So you loose little launching ability with lighter pulleys and flywheels but gain lighter weight car and more HP) But with RWD not many are worried about gaining or loosing launching power!

Darrell · December 8th, 2006, 03:38 PM

1 pound of rotating mass is equal to 8 lbs of dead weight. However in the case of underdrive pullies the difference is so minimal that you will never notice it.

firefly1241 · December 8th, 2006, 03:39 PM

thats alot of helpful info not really for the get up in go i want it in the long run

Tony_90fox · December 8th, 2006, 03:58 PM

do you have gears? you will get up and go with some 4:10s for sure!

turbong · December 8th, 2006, 04:56 PM

--------------------------------------------------------------------------------
"1 pound of rotating mass is equal to 8 lbs of dead weight. However in the case of underdrive pullies the difference is so minimal that you will never notice it. "

Are you sure it's not 1.8lbs rotating to 1lbs dead weight? I don't think it's that much of a differance. If a steel pully weighs 5lbs then that would be 40lbs rotating. I think the ratio is 1.8 for ever 1lb, if i'm wrong then please corect me. I'm looking for it online but with no luck.... LOL

every100lbs is a .10 in the quarter mile

TENGRAM · December 8th, 2006, 06:15 PM

Originally Posted by turbong

--------------------------------------------------------------------------------
"1 pound of rotating mass is equal to 8 lbs of dead weight. However in the case of underdrive pullies the difference is so minimal that you will never notice it. "

Are you sure it's not 1.8lbs rotating to 1lbs dead weight? I don't think it's that much of a differance. If a steel pully weighs 5lbs then that would be 40lbs rotating. I think the ratio is 1.8 for ever 1lb, if i'm wrong then please corect me. I'm looking for it online but with no luck.... LOL

every100lbs is a .10 in the quarter mile

you may be right about the rotating mass, i really don't know, but a pulley doesn't weigh 5lbs...its much less, probably 1 maybe 2 pounds.

also its important to point out that, although 100lbs is about a tenth in the quarter, normal street driving is where weight reduction really pays off. consider driving and never shifting later than 2000rpm. at 2000rpm our 5ohs only have about 100hp. at 100hp, weight plays a much larger role in performance.

December 6th, 2006, 03:39 PM	#1
firefly1241 Regular Join Date: Nov 2006 Posts: 93	Underdrive pulley looking to pick up an underdrive pulle kit for my 1992 gt havent looked to hard to find one yer was wondering wat are some good sites you guys use for parts also what a grood brand of pulleys would be ?

December 6th, 2006, 04:34 PM	#2
Darrell Feb 08 ROTM 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: Fond du Lac, Wisconsin Posts: 7,318	Summit. March or BBK underdrive pulleys are good. There are alot of other good ones out there too. __________________ Racing in memory of Dave Bandt 11/19/69 - 3/23/08 "he's traded his wheels for wings" Professor of Natural Aspiration Thanks to: Artie at Trick Flow, Dave at Team Z Motorsports, Brian at Total Engine Airflow and Harold at Furo Racecraft

December 6th, 2006, 05:33 PM	#4
TENGRAM Hardcore Enthusiast Join Date: Jun 2006 Posts: 1,027	the difference in weight is so minimal i don't think it would make a difference either way. for something as simple as underdrive pulleys, just buy the cheapest ones you can find. mine were made by CAT...never heard of them? me neither, but they were $40 and do the job as well as any __________________ 89 GT t5 3.73 www.my5oh.com/

December 6th, 2006, 06:20 PM	#6
82GT Regular Join Date: Nov 2006 Location: Danville, Pa. Posts: 243	You can usualy find a cheap set on Ebay __________________ 1982 GT (t-top) 351w(.060),10:3, ported & polished iron heads, 1.94/1.60 valves, BBK shorties & flowmasters, 274XE cam, stealth intake, mallory dizzy, stealth intake, 750dp, Edge 3700 stall converter, C-4, 4:10's Best E.T 12.85@102mph

December 8th, 2006, 11:30 AM	#13
turbong Regular Join Date: Oct 2006 Posts: 84	Well personally I would like to see a test done to see if there is a difference. In theory rotating mass weighs more then stationary mass. For example 1lb weights 1lb, but a 1lb pulley rotating at X speed then it now weighs 1.3 lbs. Not 100% sure on formula. So you would be gaining on loss of weight but how much is the real question. I do say the billet pulleys are better since they would never rust or need painted. And the cost isn’t that big of difference 50 compared to 80…. __________________ "90 LX 12.5 @ 114 / $8,500 invested? How much did you spend on that 13.0 Vet?" "Treat your car like you treat women: wash, rub down, pamper, then pound the shifter in every gear, drive it till it gets loose and trade it in for a new model!"

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December 6th, 2006, 04:38 PM	#3
firefly1241 Regular Join Date: Nov 2006 Posts: 93	srry for the serious masacre in my last post lol. but anyways i was looking at some bbk steel underdrive pulleys, I was going to get there steel kind since they should be built stronger but idk for sure. Aluminum is light and may give me a better take off even if it is a hair of a second what are your guys ideas?

December 6th, 2006, 06:37 PM	#7
cobraetti Regular 2001 svt cobra 10's I wish Join Date: Aug 2006 Location: goose creek,sc Posts: 249	I got the BBK steel from CJPONYPARTS.COM($80.00), the only thing I might be aware of was that when I used the alt. pulley it greatly reduced the output of my alt.. So I went back with the stock Alt. pulley :sleep

December 6th, 2006, 10:09 PM	#8
firefly1241 Regular Join Date: Nov 2006 Posts: 93	so if i go with them keep the stock alt pulley ??? or was that just in your case 89 ragtop ?

December 6th, 2006, 11:21 PM	#10
firefly1241 Regular Join Date: Nov 2006 Posts: 93	how much off a taurus u think and what year ???

December 7th, 2006, 07:23 PM	#11
cobraetti Regular 2001 svt cobra 10's I wish Join Date: Aug 2006 Location: goose creek,sc Posts: 249	Yes in my case it benefited me to reinstall the factory ALT. pulley(lights were going dim at idle). you can see if this is the case with yours

December 7th, 2006, 09:52 PM	#12
shurb125 Regular 1993 Mustang LX Vert Join Date: Nov 2006 Location: South Carolina Posts: 432	Just put a set ot BBK on my 93 covert Wednesday, haven't had any problems thus far, and as far as the alt pulley the new BBK was actually slightly bigger than the original but I still put it on anyways.

December 8th, 2006, 03:02 PM	#15
turbong Regular Join Date: Oct 2006 Posts: 84	Yes and no at the same time! The rotating mass (weight) helps you only when launching the car from a slow roll or a complete stop. For example pick up a bucket of water and throw it as far as you can with out spinning it around first. Then using the same amount of water in the same bucket twirl the bucket around and around like a helicopter and then release it. The second throw will travel much further. I had an AWD Eclipse and with the stock fly wheel I could launch the car at 3k RPMs but when I put on an aluminum flywheel I lost the ability to launch the car at 3k, I had to at 5-6k RPMs. (So you loose little launching ability with lighter pulleys and flywheels but gain lighter weight car and more HP) But with RWD not many are worried about gaining or loosing launching power! __________________ "90 LX 12.5 @ 114 / $8,500 invested? How much did you spend on that 13.0 Vet?" "Treat your car like you treat women: wash, rub down, pamper, then pound the shifter in every gear, drive it till it gets loose and trade it in for a new model!"

December 8th, 2006, 03:38 PM	#16
Darrell Feb 08 ROTM 1990 Mustang LX 9.36@143 mph Join Date: Jan 2006 Location: Fond du Lac, Wisconsin Posts: 7,318	1 pound of rotating mass is equal to 8 lbs of dead weight. However in the case of underdrive pullies the difference is so minimal that you will never notice it. __________________ Racing in memory of Dave Bandt 11/19/69 - 3/23/08 "he's traded his wheels for wings" Professor of Natural Aspiration Thanks to: Artie at Trick Flow, Dave at Team Z Motorsports, Brian at Total Engine Airflow and Harold at Furo Racecraft

December 8th, 2006, 03:39 PM	#17
firefly1241 Regular Join Date: Nov 2006 Posts: 93	thats alot of helpful info not really for the get up in go i want it in the long run

December 8th, 2006, 04:56 PM	#19
turbong Regular Join Date: Oct 2006 Posts: 84	-------------------------------------------------------------------------------- "1 pound of rotating mass is equal to 8 lbs of dead weight. However in the case of underdrive pullies the difference is so minimal that you will never notice it. " Are you sure it's not 1.8lbs rotating to 1lbs dead weight? I don't think it's that much of a differance. If a steel pully weighs 5lbs then that would be 40lbs rotating. I think the ratio is 1.8 for ever 1lb, if i'm wrong then please corect me. I'm looking for it online but with no luck.... LOL every100lbs is a .10 in the quarter mile __________________ "90 LX 12.5 @ 114 / $8,500 invested? How much did you spend on that 13.0 Vet?" "Treat your car like you treat women: wash, rub down, pamper, then pound the shifter in every gear, drive it till it gets loose and trade it in for a new model!"

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