underdrive pulley question

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Jun 22, 2013 | 04:00 PM

RobsZ28

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From: Mesa, AZ

underdrive pulley question

Anyone notice inconsistent and or higher engine temperature after switching to a 25% under drive crank pulley? The engine in my car was rebuild everything is new including the cooling system it's a forged bottom end 11.1 347ci now. I had better and consistent coolant temperatures with a stock engine and a cracked leaking radiator.

Jun 22, 2013 | 04:21 PM

badazz81z28

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Quote:

Originally Posted by RobsZ28

A high performance engine will make more heat, but it doesn't help when your water pump is spinning slower. I would expect some minor issues with a UDP. Higher engine temps be one in addition to charging issues and power steering functions. All that stuff is spinning slower with a UDP.

Jun 22, 2013 | 04:34 PM

Rich-L79

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From: Nebraska, The Good Life

I've noticed absolutely no changes in cooling or AC function after installing a 25% UDP on my LS2. It revs quicker though!

Jun 22, 2013 | 04:43 PM

spy2520

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From: Waldorf, MD

It shouldn't make a huge difference. Unless you're idling for a long time.

Jun 24, 2013 | 03:18 PM

AmarilloWS6

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From: Van Buren AR

I had a Powerbond 25% underdrive pulley on my ws6 and never had issues, temps stayed the same, no flickering lights, etc. I now have a c5 with a Powerbond 25% underdrive pulley again and I still don't have any issues with anything. Both of my cars have been tuned with the pulley on as well so that may be part of the reasoning.

Jun 24, 2013 | 04:28 PM

dailydriver

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From: Bucks County, Pa.

I know everyone on here swears by them, and I even had an ASP on the car for 12 years from buying it new, but I NEVER thought it was 'worth' the very few extra ponies it delivered vs. battery life, stop and go traffic cooling issues (shortening battery life even more from the fans constantly being on

), and a little rougher running due to less 'flywheel effect' balancer mass.

So, when that fell apart, I went with a FULL, OEM size Fluidampr to replace it.

Jun 24, 2013 | 04:36 PM

sopes

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From: In the Sticks

I have heard so many mixed reviews, I think this winter I will get one. I dont plan on it idling for long periods but when I do that I will be getting a custom tune