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BPT under drive pullies 

 

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Posted: Tue Jun 06, 2006 8:09 am 
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i got the ford racing ones,, love them,. i noticed the difference in revs when i put them on, had no problems

 

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Posted: Tue Jun 06, 2006 1:27 pm 
Oompa Loompa
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im a dealer for bpt in bunbury W.A and they are well worth having i run a race set on my ba xr8 with a flashtuner and some other mods and im getting nearly 260 at the rears blows hsv's into outer space

 

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boss 260 with BPT motorsport tune helix tower power spacer C.A.I kit 25% under drive kit cat back twin 2.5" exhaust 250-260kw at the rears

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Posted: Tue Jun 06, 2006 5:40 pm 
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XR9UTE wrote:

Actually No, the alternator pulley is slightly smaller to speed it back up again due to the much smaller crank pulley. So in fact the alternator pulley is an Overdrive pulley to compensate for the small crank pulley. This is why this is a good underdrive set...it doesn't underdrive so much that the battery won't stay charged.

Pete.


IMO that defeats the purpose of fitting underdrives, if you reduce the size of both pulleys, you not acheiving a reduction in parasitic power (hp/kw) drain from the alternator (be it a small as it is), all your acheiving is reducing the flywheel effect that is caused by the larger drive pulley, ie big pulley slower to get going and stop, smaller pulley spins up faster and stops faster, sure you'll increase your rev response, but you'll suffer the same drain of power (minimal anyway).

Horses for courses I suppose, so long as your happy. I reckon the Ford ones are the only ones to have as they provide the best of both worlds, just do you homework and don't listen to hype of either brand.

 

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Posted: Wed Jun 07, 2006 11:27 am 
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The water pump and power steering would be using a lot more power than the alternator, so it isn't a total waste.

Remember the BPT single pulley replaces the crank and slows everything down as well, although the downside of this kit is the slightly different length belt you need. I know it sounds like that'll be a big problem, but really, how often do you throw a serpentine belt? The only ones I've heard of were due to idler bearings siezing or pulley's being out of alignment.

Also, don't you need to get the water pump pulley machined on the FRPP set? I remember Shane (MrLandau) used to sell these kits on here, and had to get them machined to suit the Aussie 5.0 water pump.
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Posted: Wed Jun 07, 2006 11:40 am 
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I thought the BPT still used the same belt?

 

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Posted: Wed Jun 07, 2006 11:52 am 
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The BPT single pulley kit uses a shorter belt. It's the only way it can work.
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Posted: Wed Jun 07, 2006 12:12 pm 
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Ok. They also supply a 3 pulley kit that uses the same belt though don't they?

 

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Posted: Wed Jun 07, 2006 12:22 pm 
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I'm not sure mate, you're best off contacting BPT, the pully I bought was one of the very first they sold, 3 years ago.
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Posted: Wed Jun 07, 2006 2:56 pm 
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Nope, the BPT kit uses the stock belt.

Pete.
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Posted: Wed Jun 07, 2006 3:20 pm 
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znipa-x wrote:
XR9UTE wrote:

Actually No, the alternator pulley is slightly smaller to speed it back up again due to the much smaller crank pulley. So in fact the alternator pulley is an Overdrive pulley to compensate for the small crank pulley. This is why this is a good underdrive set...it doesn't underdrive so much that the battery won't stay charged.

Pete.


IMO that defeats the purpose of fitting underdrives, if you reduce the size of both pulleys, you not acheiving a reduction in parasitic power (hp/kw) drain from the alternator (be it a small as it is), all your acheiving is reducing the flywheel effect that is caused by the larger drive pulley, ie big pulley slower to get going and stop, smaller pulley spins up faster and stops faster, sure you'll increase your rev response, but you'll suffer the same drain of power (minimal anyway).

Horses for courses I suppose, so long as your happy. I reckon the Ford ones are the only ones to have as they provide the best of both worlds, just do you homework and don't listen to hype of either brand.


Well actually it doesn't defeat the purpose of fitting the underdrives because the main parasitic loss is due to the water pump so once the maximum drive reduction to that and the other accessories is sorted via crank pulley diameter it's a matter of sizing the alternator pulley so you don't have any drawbacks like; charging problems and not being able to use the stock belt.
The point is that most of the kits that people have used(the FRPP kit included) have ended up with charging problems and some cooling(but this is less common). If you like yours that's good but I've done my homework and this is why I recommend the BPT kit over any others.

Pete.
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Posted: Wed Jun 07, 2006 3:53 pm 
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XR9UTE wrote:
Nope, the BPT kit uses the stock belt.

Pete.


Damn, cause I just bought a shorter belt for the BPT underdrives, thinking they were the same as the other kits.

For Sale: 1 brand new belt suited for EL with underdrives, 25mm shorter.

 

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Posted: Wed Jun 07, 2006 4:19 pm 
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Dave I'll take the belt back and get a re-fund for ya.
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Posted: Wed Jun 07, 2006 7:25 pm 
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Thanks Sean, i'll give it to you at the next ic meet, otherwise let me know if you need it back sooner

cheers

 

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Posted: Wed Jun 07, 2006 8:12 pm 
Oompa Loompa
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it depends on which xr8 you have if have got a ba then it has the same belt all other model u need a new belt

 

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boss 260 with BPT motorsport tune helix tower power spacer C.A.I kit 25% under drive kit cat back twin 2.5" exhaust 250-260kw at the rears

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Posted: Thu Jun 08, 2006 12:50 am 
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I'm talking about the E-Series V8 kit. I 100% guarantee the single pulley kit needs a shorter belt, how else can it work?
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