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underdrive pulleys??? 

 

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 Post subject: underdrive pulleys???
Posted: Wed Sep 19, 2007 10:30 pm 
Oompa Loompa
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WA, Australia

anyone one done it to the xh 5.0 and what results did you get

cheers

phil

 

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Posted: Thu Sep 20, 2007 11:07 am 
Getting Side Ways
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Talk to Jeff (XH5LWEPN), or see his heads & cam thread. I'm pretty sure his underdrives are documented in there.

Also, look at the E series 5L differences. Same engine, just different body.

 

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Posted: Thu Sep 20, 2007 9:01 pm 
Getting Side Ways
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Ride: ef xr8

Power: 229 rwkw

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I have em on my car. They are the ones from BPT.

They do make a noticable difference for what they are. Just make sure your alternator is in good nick too.

 

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Posted: Fri Sep 21, 2007 2:33 pm 
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I'd recommend the underdrives, noticed a good gain with mine, car revved up alot quiker.

 

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 Post subject: Re: underdrive pulleys???
Posted: Fri Sep 21, 2007 2:41 pm 
Getting Side Ways
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maxwell wrote:
anyone one done it to the xh 5.0 and what results did you get

cheers

phil


ive got the b.p.t. race set on my elxr8 and yeah im happy with em. probably one of the best bang for buck mods out there for the windsor, nice litle gain (nothing huge but noticable) and not much money spent. there was a chrome set in the forsale section not so long ago (i think it was on here)

 

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Posted: Fri Sep 21, 2007 11:29 pm 
Getting Side Ways
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I have them, not from BPT but from states with modification to water pump pulley. It's meant to be a 10kw gain but all you really notice is that the car revs faster. Extractors is the best mod you can do if you haven't done it.

 

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Posted: Sat Sep 22, 2007 12:49 am 
Getting Side Ways
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Ride: 1999 XHII XR8, 2002 AU Fairmont

Power: 236 rwkw

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I had BPT 3 peice ones fitted to my ute before i was running the alloy heads. You can feel a slight difference in the ramp up speed of the revs, we just put them on a mates EL XR8 5spd and it definately made a difference in the mid-range, made the time between about 2800-4500 that little bit quicker, we all know how agonising that time can be with E7's and HO. Although i was running explorer, paceys, twin 2 1/4" exh with the E7's and the underdrives and still made 157rwkw, sure they must of aided in that.
Am still running them to this day and havent had a problem, but like stated above be sure alternator and cooling system are in good nick.

 

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Posted: Wed Sep 26, 2007 11:33 pm 
Oompa Loompa
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cheers fellas looks like i'll get it done then but the only question i have is where can i get it done in perth and how much?having a hard time trusting car places these days, any good ones out there???

 

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Posted: Wed Sep 26, 2007 11:37 pm 
Getting Side Ways
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Ride: 1999 XHII XR8, 2002 AU Fairmont

Power: 236 rwkw

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WA, Australia

BPT Motorsport in Wangara, they can supply and fit them. I think you'll have a hard time finding them elsewhere. If i was you just fit them yourself, very very easy.

 

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Posted: Thu Sep 27, 2007 11:00 am 
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i hear that you need a a bigger pully on the alt as it under chages with the under drive pully

 

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Posted: Thu Sep 27, 2007 6:43 pm 
Getting Side Ways
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BuNtEr wrote:
i hear that you need a a bigger pully on the alt as it under chages with the under drive pully


not really an issue unless your idling for hours in traffic, or driving at night with ultra high watt lights, or maybe a supa dupa stereo, I've never had a problem

 

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Posted: Thu Sep 27, 2007 7:36 pm 
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I'm having trouble with mine with the lights on and with summer coming on the aircon is going to be a b**ch too. I think I'll try a smaller pulley before i change the alternator tho!

 

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Posted: Tue Oct 02, 2007 5:17 pm 
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Had problem with BPT pulleys and alternator in 5.0L ED Fairmont - especially with thermofans and climate control running together.
Bolted in an EL 5.0L 110A alternator and used a VN alternator pulley.
(55mm dia with 17mm shaft).
Also ran another battery cable (16mm2) from + ve alternator terminal to +ve battery terminal.

Richie.

 

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Posted: Sat Nov 22, 2008 3:07 am 
Getting Side Ways
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richie wrote:
Had problem with BPT pulleys and alternator in 5.0L ED Fairmont - especially with thermofans and climate control running together.
Bolted in an EL 5.0L 110A alternator and used a VN alternator pulley.
(55mm dia with 17mm shaft).
Also ran another battery cable (16mm2) from + ve alternator terminal to +ve battery terminal.

Richie.


good info
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Posted: Sun Nov 23, 2008 1:43 am 
Stock as a Rock
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The AU alternator pulley is also smaller than the e-series pulley.

 

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