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Underdrive pulleys... 

 

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 Post subject: Re: Underdrive pulleys...
Posted: Sun Apr 15, 2012 12:51 pm 
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Your thermostat controls the temp so it wouldn't be running any hotter.
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 Post subject: Re: Underdrive pulleys...
Posted: Sun Apr 15, 2012 1:05 pm 
Getting Side Ways
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but the thermostat only controls the flow of water that the pump has put into the head
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 Post subject: Re: Underdrive pulleys...
Posted: Sun Apr 15, 2012 9:40 pm 
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79raven wrote:
but the thermostat only controls the flow of water that the pump has put into the head

and thereby controlling the temp.
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 Post subject: Re: Underdrive pulleys...
Posted: Mon Apr 16, 2012 1:22 am 
Getting Side Ways
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Looks like another little test for Streetbuilt to do on the dyno. Run a stock 302 without underdrives, then fit a set with the car still on the rollers and run her up again...

 

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 Post subject: Re: Underdrive pulleys...
Posted: Mon Apr 16, 2012 10:14 am 
Oompa Loompa
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Scaffy wish you guys were in sydney would have you tune my el xr8

jeff sent me down some underdrives fitted them up and you feel a difference on the bum0meter
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 Post subject: Re: Underdrive pulleys...
Posted: Mon Apr 16, 2012 10:39 am 
Getting Side Ways
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Scaffy wrote:
Looks like another little test for Streetbuilt to do on the dyno. Run a stock 302 without underdrives, then fit a set with the car still on the rollers and run her up again...


yea mate if you could kill this off once and for all would be great.
be it either way, i would like to see the results.

 

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 Post subject: Re: Underdrive pulleys...
Posted: Thu Apr 19, 2012 3:29 pm 
Getting Side Ways
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Yeah, we'd just need to find a suitable car for the test. I suppose it wouldn't hurt to do it on an EB GT. Will try and get on to it after I get home in a couple of weeks.

Andy, I wish we had more E-series over here that I could have a play with. I might have to go over that way for a working holiday some time.

 

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When injustice becomes law, resistance becomes duty

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 Post subject: Re: Underdrive pulleys...
Posted: Fri Jan 25, 2013 3:55 pm 
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Hey, how do I order myself a set of the Ford racing ones for my EF? Im keen as...

 

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 Post subject: Re: Underdrive pulleys...
Posted: Sun Jan 27, 2013 9:29 pm 
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www.summitracing but I wouldn't get Ford racing ones.
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 Post subject: Re: Underdrive pulleys...
Posted: Sun Jan 27, 2013 9:37 pm 
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How come? They not real good, have problems?

 

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 Post subject: Re: Underdrive pulleys...
Posted: Sun Jan 27, 2013 9:51 pm 
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Get steel ASP ones.
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 Post subject: Re: Underdrive pulleys...
Posted: Sun Jan 27, 2013 10:10 pm 
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Ill look into it, thanks heaps.
Do they actually give a noticeable gain? Do I need replace idlers/tensioner pulleys too, or stock ones are fine?

 

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 Post subject: Re: Underdrive pulleys...
Posted: Mon Jan 28, 2013 11:56 am 
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They produce a noticeable gain over the entire rev range. In fact they're the best performance bang for the buck on a 5.0.
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 Post subject: Re: Underdrive pulleys...
Posted: Mon Jan 28, 2013 12:34 pm 
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So I was looking at the summit racing ones, and I dont know enough about them to understand what im looking at, which ones will fit, etc... They're for mustangs, not falcons, the crank looks too big, and the water pump is ribbed, on my xr8 water pump is smooth...
Ive also been thinking about this one http://www.bptmotorsport.com.au/home/pr ... detail/246 ?

 

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 Post subject: Re: Underdrive pulleys...
Posted: Thu Apr 25, 2013 10:33 am 
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Hi Guys - found reading through this pulley post interesting, and I'm hoping someone with experiance can assist :-))

Situation - I've brought and installed an aftermarket WP pulley that measures 5.7in which is the same measurement as my AU HBalancer. The after market WP was a flow cooler and when it arrived the factory WP would not fit as it was to small and shallow... hence the only WP I could get to fit was the current spec mentioned.

So now after reading up - i feel I have created an under driven set up which is good or have I misunderstood the concept ???

Also ---

Question - is this a workable ratio for my engine ?? ( 347 )

Question - can my factory fan belt can be used ??

Thanks in advance - just trying to cover as many bases possible prior to install :-))

 

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