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L83 Underdrive crank pulley installed!

8thsense

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TJay74 Senior Enthusiast

TJay74

Posted
Posted

 

Some other brands that make the Under drive Pulley as well. SLP part# 100230A

 

 

 

If SLP is like they were in the past, they don't make the pulley. It is made by Powerbond out of Australia.

Willshire Enthusiast

Willshire

Posted
Posted

Not in concert.... It would slow the Blower down!

 

RT

Requires overdriving the whipple. I never thought of an underdrive crank pulley before. I guess i assumed GM put the pulley on there to maximize cooling and charging efficiency. Anyone making an electric water pump? lol

07Softail Senior Enthusiast

07Softail

Posted
Posted

I'm not so sure you could get a pulley that small to compensate for loss of boost...then you would have serious belt slipping issues, remember the smaller the pulley the less surface contact area not to mention a lot of money and work for a crank pulley.

 

RT

Txjose Senior Enthusiast

Txjose

Posted
Posted

I'm not so sure you could get a pulley that small to compensate for loss of boost...then you would have serious belt slipping issues, remember the smaller the pulley the less surface contact area not to mention a lot of money and work for a crank pulley.

 

RT

Whipple does make some really small pullys but idk....

 

Slowing everything down doesnt seem safe to me.... Never ran one before but that cant be keeping everything else in spec

 

Sent from my Note 4 on Tapashit

07Softail Senior Enthusiast

07Softail

Posted
Posted

Whipple does make some really small pullys but idk....

 

Slowing everything down doesnt seem safe to me.... Never ran one before but that cant be keeping everything else in spec

 

Sent from my Note 4 on Tapashit

I put an underdriven pulley on my 91 502 SS truck and it sucked.... the alternator would not charge at idle and the lights dimmed at idle and brightened up above that. Even the quick ratio power steering was sluggish.... I hate them and will never do another one. Did I say underdriven pulleys suck!

 

RT

Txjose Senior Enthusiast

Txjose

Posted
Posted

I have a question, would installing an under drive pulley void the factory warranty?

 

 

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You bet.... If anything goes wrong they can pretty much bkame it on the pully. Its smaller then spec and they will link it to slower spinning components at fault.

 

Sterring goes kaput.... Oh the slower spinning pully couldn't keep up so it over heated.

 

Engine goes kabang.... Well the crank could have been off balance.

 

Alternator doesn't charge.... Yeppp that pully under spins the alt so it won't charge.

 

 

You stubbed your small toe on the kitchen table barefoot??..... It was the pullys fault.

 

 

Lol

 

Sent from my Note 4 on Tapashit

TJay74 Senior Enthusiast

TJay74

Posted
Posted

I have ran UD pulleys on my 1989 Formula, 2001 Formula, 2006 GTO, 2008 Trailblazer SS and never had a issue with any of them, prob have 250k miles on vehicles with UD pulley's on them. My plan was to add one to my 2014 Sierra, but that is on hold until I find out what I am going to do with the truck. Waiting to hear back from GM right now.

  • 7 months later...
SCMChevyMan New Member

SCMChevyMan

Posted
Posted

I know this is an old post but I am trying to find the belt sizes/part numbers to match this pulley. Between Google and the forum I am having no luck. Any help would be appriciated!!

TJay74 Senior Enthusiast

TJay74

Posted
Posted

Most pulleys include a card that gives you the Gates belt size to use with their pulley. Also some kits can be had as a 2 pulley kit that will also come with the alternator pulley so you don't have charging issues.

truckguy82 Senior Enthusiast

truckguy82

Posted
Posted

This is one of those things that costs GM nothing yet they specifically decided on the speed at which these items need to rotate at.

 

You have to wonder why on earth they would choose those rotational speeds, and that there most certainly has to be a downside of some sort.

TxTruckMan Senior Enthusiast

TxTruckMan

Posted
Posted

GM is looking for every tenth of MPG and HP that they can find. Why wouldn't GM do this simple mod? Because there will be problems...

 

What's that saying about a fool and their money?

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