Underdrive Pulleys??
thanks guys for all the responses, and thats an awesome price, wish i had the cash now... ive only heard good things from the swap so its deffintly gpoing to happen!!
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Joined: Sep 2009
Posts: 859
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From: Frozen Tundra, WI
I am in the market for a UD pulley. How much extra for an OD alternator pulley, too?? I do have a 6.0 truck motor & accessories if it makes a difference...no A/C (yet).
Glad we could help you out 
I forgot to add in this thread but I have offered it to those who have purchased from me when they call, you guys can upgrade to our reusable crank bolt and the price is $210 instead of $199!
I forgot to add in this thread but I have offered it to those who have purchased from me when they call, you guys can upgrade to our reusable crank bolt and the price is $210 instead of $199!
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From: Bossier city,LA barksdale AFB
I love my ASP but summit racing has a killer deal on one! Ive put on a few cars its nice!
it used to be $150 nows its $180. its 25% and looks just like powerbond and slp's
http://www.summitracing.com/parts/SU...2/?image=large
it used to be $150 nows its $180. its 25% and looks just like powerbond and slp's
http://www.summitracing.com/parts/SU...2/?image=large
Last edited by SIC LSX; Dec 16, 2009 at 09:17 AM.
I use and recommend Fluidampr underdrive for the f-body. It's 10%, not 25%, but it's also aluminum and weighs a bit more than 3 pounds LESS than a stock pulley. And that's rotating mass you are dumping, just like if you put a lighter flywheel in, or run a lighter driveshaft. Less weight to turn.
And aside from slighly underdriving the accessories, and losing rotational mass... I find them to be smoother than the others due to the fluid encased steel ring which is effective at all RPM's and not certain tuned ranges like elastomer pulleys. And there is no elastomer to wear out either.
Yes it costs more @ just over $360... but it's one of the best mods I made. Car idles, revs smoother, and faster too. Did not dyno it, but the difference was as noticeable as my aluminum flywheel.
And aside from slighly underdriving the accessories, and losing rotational mass... I find them to be smoother than the others due to the fluid encased steel ring which is effective at all RPM's and not certain tuned ranges like elastomer pulleys. And there is no elastomer to wear out either.
Yes it costs more @ just over $360... but it's one of the best mods I made. Car idles, revs smoother, and faster too. Did not dyno it, but the difference was as noticeable as my aluminum flywheel.
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Results matter. Talk is cheap. We are miles beyond the success anyone else has had with the 4th gens, and C5, C6, C7 Corvettes,
10 SCCA Solo National Championships, 2008 Driver of they Year, 2012 Driver of Eminence
13 SCCA Pro Solo Nationals Championships
2023 UMI King of the Mountain Champion
right on point ! if its going to b a drivien DD or weekend car now need for the pulley kit (UD and alt pulley)
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iTrader: (10)
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From: Bossier city,LA barksdale AFB
LOL No you dont need a alt pulley! Had one for 3 years and never below 13-14volts at idle on same battery. I have install a ton of UD pulleys and never had any problems at all! Even a few cars with amps and subs.
i put mine on yesterday and found no difference with charging system no alt pulley oh and don't know about the summit but the powerbond is sfi approved and thats important for drag racers
TECH Apprentice
Joined: Jun 2009
Posts: 370
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From: Garland, TX
How could it not free up hp?
it is like running an elec fan to a belt driven fan.
It takes hp to run accessories.if you don't have the drag on the motor as much it doesn't require the same amount of hp to spin them.
it is like running an elec fan to a belt driven fan.
It takes hp to run accessories.if you don't have the drag on the motor as much it doesn't require the same amount of hp to spin them.
I love my ASP but summit racing has a killer deal on one! Ive put on a few cars its nice!
it used to be $150 nows its $180. its 25% and looks just like powerbond and slp's
http://www.summitracing.com/parts/SU...2/?image=large
it used to be $150 nows its $180. its 25% and looks just like powerbond and slp's
http://www.summitracing.com/parts/SU...2/?image=large
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From: Bossier city,LA barksdale AFB
Joined: Aug 2007
Posts: 24,241
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From: Turnin' Wrenches Infractions: 005
The Summit does not look like the Powerbond at all, that one has a screw on front plate and the Powerbond uses a snap ring. The powerbond is now black with timing marks as well (much better looking than it used to be, IMO.)
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WHIPPLE Superchargers, Procharger, Magnuson, Powerbond Sale, HPTuners packages!, Trickflow, AFR, PRC, CHE Trunion upgrade, $100 7.400" pushrod set, Custom Cam of your choice
800-456-0211 / PM / Facebook
WHIPPLE Superchargers, Procharger, Magnuson, Powerbond Sale, HPTuners packages!, Trickflow, AFR, PRC, CHE Trunion upgrade, $100 7.400" pushrod set, Custom Cam of your choice