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au xr8 performance pulleys?... 

 

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 Post subject: au xr8 performance pulleys?...
Posted: Mon Jul 09, 2012 11:00 pm 
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need to replace the idler pulley on my au xr8 ute. wanted to know if performance pulleys are availible or wether
they are already under driven?
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 Post subject: Re: au xr8 performance pulleys?...
Posted: Mon Jul 09, 2012 11:05 pm 
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AU's are underdriven from factory.

 

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More people paid for a ride in a VT commodore then an AU Falcon so the VT is superior.
Based on that fact my Mum is the best around!

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 Post subject: Re: au xr8 performance pulleys?...
Posted: Mon Jul 09, 2012 11:31 pm 
Stock as a Rock
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ahhh ok. so a gates nuline pulley set is just a standard direct replacement?
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 Post subject: Re: au xr8 performance pulleys?...
Posted: Tue Jul 10, 2012 7:04 pm 
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EVL098 wrote:
AU's are underdriven from factory.


No they're not.
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 Post subject: Re: au xr8 performance pulleys?...
Posted: Tue Jul 10, 2012 9:26 pm 
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Btw I'd be able to show you why they aren't underdriven and calculate the drive ratio of any pulley setups but this forum won't allow me to upload an Excel sheet for some reason?
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 Post subject: Re: au xr8 performance pulleys?...
Posted: Tue Jul 10, 2012 9:28 pm 
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ive heard from a few people that there under driven....
why do you say there not?
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 Post subject: Re: au xr8 performance pulleys?...
Posted: Tue Jul 10, 2012 9:42 pm 
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XR9UTE wrote:
Btw I'd be able to show you why they aren't underdriven and calculate the drive ratio of any pulley setups but this forum won't allow me to upload an Excel sheet for some reason?


Print it as a PDF and upload that after hosting it at photobucket or similar.

 

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 Post subject: Re: au xr8 performance pulleys?...
Posted: Tue Jul 10, 2012 9:48 pm 
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blue_oval_power wrote:
ive heard from a few people that there under driven....
why do you say there not?


Easy, I measured them. The trouble is most of these people that say they are underdriven, only look at the diameter of the smaller crank pulley and think straight away they are underdriven but, it's the relationship between the crank pulley and the other pulleys that matters.
Here's a copy of my sheet that you'd be able to use if I was able to upload an excel sheet...
Maybe I could PM or email it to you if you're interested?

After measuring all of the pulleys I've worked out the approximate drive ratios to each of the accessories.
On E-series
we have for the;
Alternator 2.827:1
Water pump 1.355:1
Pwr steer 1.12:1

For AU it's;
Alternator 2.9:1
Water pump 1.272:1
Pwr Steer 1.19:1

That means;
AU alternator is overdriven approx 7% compared to E-series.
AU Water pump is underdriven approx 8% compared to E-series.
AU Pwr Steer is overdriven approx 7.5% compared to E-series.
Average 3.3% underdriven compared to E-series(or in technical terms f**k ALL!)

Now E-series underdrives;
Alternator 2.27:1 = 55% underdriven compared to stock E-series
Water pump 0.778:1 = 57% underdriven compared to stock E-series
Pwr Steer 0.842:1 = 28% underdriven compared to stock E-series
Average 46.6% underdriven compared to stock E-series
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 Post subject: Re: au xr8 performance pulleys?...
Posted: Tue Jul 10, 2012 9:50 pm 
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dc_todd wrote:
XR9UTE wrote:
Btw I'd be able to show you why they aren't underdriven and calculate the drive ratio of any pulley setups but this forum won't allow me to upload an Excel sheet for some reason?


Print it as a PDF and upload that after hosting it at photobucket or similar.


Thanks DC. I'll try that.
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 Post subject: Re: au xr8 performance pulleys?...
Posted: Tue Jul 10, 2012 10:01 pm 
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It seems I can't upload excel files to photobucket either DC.
So, anyone who wants the file just email me. Excel experts could probably improve it too...I'm not very good at it.
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 Post subject: Re: au xr8 performance pulleys?...
Posted: Wed Jul 11, 2012 2:26 pm 
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Great writeup . just a bit naieve as to the gain as in power or economy ? shed some light on it would be grand .......
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 Post subject: Re: au xr8 performance pulleys?...
Posted: Wed Jul 11, 2012 3:20 pm 
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It's mainly about leverage, moments of inertia.
Best way to describe it is; Try opening the front door on your house by pushing right close to the hinge...it's bloody hard, it takes a lot of power.
Open it by the handle and it's easy, doesn't take much power at all.
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 Post subject: Re: au xr8 performance pulleys?...
Posted: Wed Jul 11, 2012 4:53 pm 
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sweet work there man.... soooo can you get under drive pulleys for au is the next question?
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 Post subject: Re: au xr8 performance pulleys?...
Posted: Wed Jul 11, 2012 5:55 pm 
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Short answer is no but, it's possible to make some.
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 Post subject: Re: au xr8 performance pulleys?...
Posted: Wed Jul 11, 2012 6:26 pm 
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This is how I ran AU EECV on my XG 5.0 van but we could apply this to AU engines.
We made this encoder wheel and pressed that onto an E-series balancer. We could do the same thing and machine a pulley with a bit of offset to align with the rest of the AU front dress.

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