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Old 01-19-2012, 08:37 AM   #1
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underdrive pulley worth it?

SLP's underdrive pulley is it worth getting, do You need anything else to go with it etc...
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Old 01-19-2012, 10:32 AM   #2
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A bitch to install, and chance of dead battery. Not recommended by me
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Old 01-19-2012, 10:34 AM   #3
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K thanks
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Old 01-19-2012, 11:21 AM   #4
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I have this same question and could use some more input. In two weeks I'm having a cam and bolt-on package done. So, I will pay no extra labor for the pulley install since the OEM pulley has to come off anyway. I hear pros about this pullyey such as it's cheap HP (5 - 8 HP for $200 -250). And the risks of a dead battery are oversated since a cammed car will have a higher idle speed anyway and that offsets the lower accessory rpms from the UD pulley. I dunno? I live in SC and the heat is tough on batteries anyway plus I certainly don't want any A/C performance issues. Folks who have a UD pulley on a cammed car - what has been your experience? Would you do it again or not and why? Any feedback would be appreciated.
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Old 01-19-2012, 11:30 AM   #5
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Quote:
Originally Posted by Parag View Post
A bitch to install, and chance of dead battery. Not recommended by me
I have the exact opposite experience. 15 minutes to install, and my voltage levels are only .5 less. I don't run any heavy stereo equipment however, just stock radio. If you plan on running power hungry electronics you will need to also install a capacitor.

You will gain between 10-15hp on average for the UDP, so just figure the $/hp ratio and see if it makes financial sense for where you are at in your mod list.
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Old 01-19-2012, 11:32 AM   #6
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Quote:
Originally Posted by SSDan View Post
I have this same question and could use some more input. In two weeks I'm having a cam and bolt-on package done. So, I will pay no extra labor for the pulley install since the OEM pulley has to come off anyway. I hear pros about this pullyey such as it's cheap HP (5 - 8 HP for $200 -250). And the risks of a dead battery are oversated since a cammed car will have a higher idle speed anyway and that offsets the lower accessory rpms from the UD pulley. I dunno? I live in SC and the heat is tough on batteries anyway plus I certainly don't want any A/C performance issues. Folks who have a UD pulley on a cammed car - what has been your experience? Would you do it again or not and why? Any feedback would be appreciated.
You bring up a good point that I didn't think of in my previous posts. My idle is at 950 with my cam, and I only see a 0.5 drop in voltage, which is very trivial. I haven't noticed any issues with accessories. The added benefit is your accessories last longer as well since the belt is turning them less.
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Old 01-19-2012, 12:07 PM   #7
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A bitch to install, and chance of dead battery. Not recommended by me
I have 2 cars with an underdrive pulley and neither one have voltage issues. The install is not bad either as long as you have the right tools for the job.
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Old 01-19-2012, 01:03 PM   #8
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Putting one on mine very soon. 5-10 rwhp is what I am hoping for.
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Old 01-19-2012, 02:19 PM   #9
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i am really into the little things to add HP so i didn't add one.
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Old 01-19-2012, 02:23 PM   #10
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Increased my tire pressure for another 5HP.....very easy!
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Old 01-19-2012, 02:46 PM   #11
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Not worth it IMO, I have better places to spend the money.

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Increased my tire pressure for another 5HP.....very easy!

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Old 01-19-2012, 02:55 PM   #12
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I have one on every car I have owned. Definitely worth it. Made my 98 SS go 11.0 @ 122 with just bolt ons. Made my 11 Vert go 12.3 @ 113 with just bolt ons and I am also running a tiny 15 lb battery with no voltage issues.
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Old 01-19-2012, 03:07 PM   #13
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A bitch to install, and chance of dead battery. Not recommended by me
I wouldn't think keeping the battery charged would be an issue unless you aren't moving and just idleing a lot.
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Old 01-19-2012, 05:56 PM   #14
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Quote:
Originally Posted by SSDan View Post
I have this same question and could use some more input. In two weeks I'm having a cam and bolt-on package done. So, I will pay no extra labor for the pulley install since the OEM pulley has to come off anyway. I hear pros about this pullyey such as it's cheap HP (5 - 8 HP for $200 -250). And the risks of a dead battery are oversated since a cammed car will have a higher idle speed anyway and that offsets the lower accessory rpms from the UD pulley. I dunno? I live in SC and the heat is tough on batteries anyway plus I certainly don't want any A/C performance issues. Folks who have a UD pulley on a cammed car - what has been your experience? Would you do it again or not and why? Any feedback would be appreciated.
Since you are doing a cam swap, it is a no-brainer. Do it. Your cam install will necessitate a idle increase which will negate the voltage drop at idle. I did not notice any effect on my AC.
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