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Camaro V8 LS3 / L99 Engine, Exhaust, and Bolt-Ons Bolt-Ons | Intakes | Exhaust

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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:
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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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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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Old 01-19-2012, 06:49 PM   #15
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Do you still see the same benefits of HP without the cam. I ordered LT with HFs and CAI. Thanks
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Old 01-19-2012, 08:10 PM   #16
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I was told by my locale gm performance shop that it isn't worth it. Keep in mind they were doing headers and cam install on my car at the time. They said it puts to much strain on other parts just for a few hp. That's what I was told.
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Old 01-19-2012, 09:05 PM   #17
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When I was a punk underdrive pullies were installed when final drives were upped so the accessories would spin at stock speed when the car was moving.
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Old 06-12-2012, 12:25 PM   #18
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Bump.... What is the charging like after the UD pulley, my stock charging is 14-14.4 volts. L99.
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Old 06-12-2012, 02:09 PM   #19
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Bump.... What is the charging like after the UD pulley, my stock charging is 14-14.4 volts. L99.
i went ahead with the UD pulley as part of my cam install. So far and over 2000 miles later - it is a total non-issue. All accessories run like stock. Guage readings are all normal except for oil pressure which is higher than stock because of the Melling pump.
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Old 06-12-2012, 02:14 PM   #20
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It's worth it as long as you have no intentions of supercharging or running a large aftermarket stereo system. Other then that, is a cost effective way to free up roughly 10-12 rwhp.
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Old 06-12-2012, 02:22 PM   #21
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So charging near 14 volts? I'm comfortable with the power gain, I've had them before, I just wanted to see if it will have charging issues before I can tune it.
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Old 06-12-2012, 02:36 PM   #22
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So charging near 14 volts?
Well, you made me go look. It must be me. Everyone always get these exact readings off the console guages ( like 28 psi oil pressure, or 225 degrees oil temp or 14.5 volts). My guages are not that exact or maybe my eyes are not that good. My volt meter reads at or just above the only mark between 12 and 19 which is what it was stock before the UD pulley. I guess that mark is 14.

I think you will be fine. I've had no problems.
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Old 06-12-2012, 02:41 PM   #23
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I wonder if this could be why my car idles like its retarded...
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Old 06-12-2012, 02:43 PM   #24
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I dont recommend a pulley on a stock engine or a very mild cam that idles low like stock. Once you get to an idle past 800rpm then the negatives about a pulley almost go away.
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Old 06-12-2012, 02:54 PM   #25
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SSDan, you can see the charging volts in that center display, just have to toggle through the options... Oil Life, Coolant Temp, etc. My stock 2010 L99 is 14.4 driving and hasn't gone lower than 14 at idle.
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