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underdrive pulley and mps gains?

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Old 11-18-2010, 07:08 PM
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Default underdrive pulley and mps gains?
Hey guys I was going to see if there is any increase in mpgs with a 25% udp? I know they claim it will help but, what do you guys think? 0,1,2,3 mpg increase?
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Old 11-20-2010, 09:10 AM
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not sure about the mileage gain, but I definately noticed that the engine revved up quicker. Remember when you buy the UD pulley add in another 30-40 bucks for the shorter belt too.
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Old 11-20-2010, 10:04 AM
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Also get the resuable ARP crank pulley bolt...
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Old 11-20-2010, 10:20 AM
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I put an ASP 25% U/D on a month or so back and haven't noticed any MPG difference. It definitely snaps up faster though. Also, a stock replacement crank-bolt from the GM dealership is $5 and is just fine.
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Old 11-20-2010, 11:53 AM
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Originally Posted by 99v6red
Hey guys I was going to see if there is any increase in mpgs with a 25% udp? I know they claim it will help but, what do you guys think? 0,1,2,3 mpg increase?
I think you bought the wrong car, buddy.....Just sayin'
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Old 11-20-2010, 11:54 AM
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Originally Posted by RARON455
not sure about the mileage gain, but I definately noticed that the engine revved up quicker. Remember when you buy the UD pulley add in another 30-40 bucks for the shorter belt too.
What belt is used?
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Old 11-20-2010, 03:11 PM
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two threads below this one...

https://ls1tech.com/forums/generatio...ve-pulley.html
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Old 11-21-2010, 10:23 PM
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ok great guys thanks!
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Old 11-22-2010, 10:18 AM
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revs a little quicker...track times went down a hair...about it...
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Old 11-22-2010, 10:37 AM
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worth it for 135? then whatever the belts cost? was hoping for a mpg increase too.
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