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  #1  
Old 10-28-2012, 10:13 PM
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UNderdrive pulley for 5.7 L hemi

Can anyone provide me a link for an under drive pulley kit for my 5.7? if there is even one, just wondering. Thanks
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Old 10-31-2012, 12:58 AM
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Re: UNderdrive pulley for 5.7 L hemi

Here ya go http://www.summitracing.com/parts/sum-c2515

put one on mine, this is the belt i used with it. no problems with anything at all
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Old 10-31-2012, 03:27 AM
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Re: UNderdrive pulley for 5.7 L hemi

Hey thanks. How was the power increase? Was it noticeable? If so I'm gonna order it right up.
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Old 10-31-2012, 06:23 AM
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Re: UNderdrive pulley for 5.7 L hemi

Interested in knowing what kind of gains you saw as well, and I know you said no probs with anything, but just to be clear, you have seen zero negative effects on charging system or cooling system?
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Old 10-31-2012, 12:56 PM
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Re: UNderdrive pulley for 5.7 L hemi

well, it technically doesnt add hp (throwing that out cuz if i dont someone else will ) it eases the drag on the engine. they say it frees up about 10 hp. I noticed it revs quicker. Also on a trip comparison the mpg went up .4 ,not huge but still up.

I have had no adverse effects with it. stays right at temp with ac on & we had way to many 100*+ days this year. I have not had any elec problems either,but The only extra i have is a amp for my sub(600w)

I had a little trouble with the install as my old crank bolt didnt go quietly but that is no fault of /with the damper. (its in my build thread-see sig )

Note summit doesnt show the jeep as an application for it, but it DOES work -lx version pn c2515
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Old 10-31-2012, 07:09 PM
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Re: UNderdrive pulley for 5.7 L hemi

Thats good to know. Would you say it was worth the money?
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Old 11-01-2012, 09:57 AM
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Re: UNderdrive pulley for 5.7 L hemi

thanks for the breakdown, def going on the wish list
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Old 11-02-2012, 05:06 PM
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Re: UNderdrive pulley for 5.7 L hemi

Quote:
Originally Posted by Combat View Post
Thats good to know. Would you say it was worth the money?
I'd do it again for sure

Note: if you're needing to do anything @ the front of the engine- water pump/timing set (i did both) steering pump, etc, save time and do them together
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Old 11-03-2012, 07:28 AM
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Re: UNderdrive pulley for 5.7 L hemi

Note: if you're needing to do anything @ the front of the engine- water pump/timing set (i did both) steering pump, etc, save time and do them together [/QUOTE]


Whats the life on these parts, did you change just to be safe or were you having problems, I have 85k on mine, just curious
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Old 11-04-2012, 01:50 PM
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Re: UNderdrive pulley for 5.7 L hemi

water pump was leaking, i replaced the 5.7 timing tensioner with one from a 6.1 the 6.1 has more springs and while its not common, some have seen the 5.7 fail, and as i like high revs, i changed it for piece of mind.

i was over 120k @ time
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Old 11-05-2012, 06:52 AM
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Re: UNderdrive pulley for 5.7 L hemi

thanks, if/when i do this ill keep those in mind
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Old 11-07-2012, 08:41 PM
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Re: UNderdrive pulley for 5.7 L hemi

Just installed the 20% UD Pulley from summit racing. Haven't gotten around to driving it; however, I will be sure to let you know if I feel any difference.
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