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Old 07-17-2004, 03:24   #1 (permalink)
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Lightbulb Underdrive Pullies

Could someone please explain what Underdrive Pullies are? And what they do?
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Old 07-17-2004, 03:34   #2 (permalink)
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Re: Underdrive Pullies

Quote:
Originally Posted by BB-GT
Could someone please explain what Underdrive Pullies are? And what they do?

The standard pullies on a car take a certain amount of power to drive them and this also affects the rpm, similar to the way a supercharger will draw power from the engine to drive it.The smaller the pulley....the less work the engine does and the quicker it will rev. Their are also advantages and disadvantages to be gained by this. One disadvantage, is the flow rate from the water pump pulley is decreased and hense the car could overheat in summer.





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Old 07-21-2004, 03:32   #3 (permalink)
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biggrin Re: Underdrive Pullies

Is this the only disadvantage? What if you fitted one of those Craigh Davies electric water pumps that are always advertised in the Mags?
Who make the pullies and where do you get them?

May 2004 Envy GT Stripes,Leather,FPV Wheel, Prem Sound, Tint, No mods Yet!
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Old 07-21-2004, 04:22   #4 (permalink)
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Re: Underdrive Pullies

http://norcom.net.au/~bpt/products.htm Give Barry a call.
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Old 07-21-2004, 22:58   #5 (permalink)
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Re: Underdrive Pullies

Quote:
Originally Posted by BB-GT
Is this the only disadvantage? What if you fitted one of those Craigh Davies electric water pumps that are always advertised in the Mags?
Who make the pullies and where do you get them?

May 2004 Envy GT Stripes,Leather,FPV Wheel, Prem Sound, Tint, No mods Yet!
Mate I have had them on my car for 6 months and all thats happened is the engine revs faster. None of this waffle about alternators not charging or water pumps not turning fast enough. JUST A CONSTANT 10 RWKW INCREASE THROUGH THE ENTIRE REV RANGE
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Old 07-22-2004, 00:49   #6 (permalink)
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Re: Underdrive Pullies

Thanks Hypnodoc!
Did you happen to have your car dynoed before you did any mods?
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Old 07-22-2004, 01:59   #7 (permalink)
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Re: Underdrive Pullies

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Originally Posted by BB-GT
Thanks Hypnodoc!
Did you happen to have your car dynoed before you did any mods?
BB-GT The underdrives were the first real mod I put on and if the bumometer is anything to go by then they work well. Be warned though that if you start making more than 310 engine kWs and you drive a manual your gonna get clutch dramas. Redhawk put them on his car and got clutch probs because they let the engine rev much freer and the pressure plate can't handle it. I had the same prob, hard soft pedal etc. rang Mal Woods in Qld and got a real clutch now I have no probs.
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Pedders Shocks & Springs,Whiteline Swaybars, Manta Exhaust System, Twin 3 inch High Flow Cats & 4 inch Dump Pipe, Injectors and High Vol Pump, FPV Mats, Tinted Glass
Whhoooosssshhh

350rwkw XTREME EDIT
The Real Performance Thing
HSV What ?
and 013, Lightning Strike:
Twin 2.5 Mandrel Bent Exhaust, High Flow Cat, CAI & Pedders Suspension
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Old 07-22-2004, 06:58   #8 (permalink)
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Re: Underdrive Pullies

Quote:
Originally Posted by Hypnodoc
None of this waffle about alternators not charging or water pumps not turning fast enough.

Waffle.....I'm sorry but it is true. Maybe not on the GT/P....Maybe not even on a Corvette....but it does happen. I think it really comes down to the design and engineering of the specific manufacturer. The Underdrives you have (for the GT/P) , are most likley very well designed & you will gain more than lose from this modd. I was speaking more on the broader scale. Underdrives are a fantastic way of getting more Kwts.....I will not dought that fact. But as with ANY modd, there are always..,,,always...Pro's & Con's associated with any deviance from the manufacturing specification.


Deviance from the manufacturing specification:wgaf: I want a Supercharger.







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Old 07-22-2004, 08:04   #9 (permalink)
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Re: Underdrive Pullies

Battens underdrive pulleys are good stuff.
i was one of the people who was worried about charging effects etc:..
i can tell you BB-GT there a good quality product that has been tested by many now, i havn't seen or heard one compliant ...like the Doc said
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Old 07-22-2004, 09:06   #10 (permalink)
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Re: Underdrive Pullies

Quote:
Originally Posted by XRFPV8
Battens underdrive pulleys are good stuff.
i was one of the people who was worried about charging effects etc:..
i can tell you BB-GT there a good quality product that has been tested by many now, i havn't seen or heard one compliant ...like the Doc said
I think perhaps its because (dare I say it) as we all know the mighty Falcon is commonly used as a taxi in its base model and the altenators would have to be able to stand a lot of low revs at full load, e.g city traffic with A/C and lights going at low revs for extended periods of time. I have noticed that the lights will dim a little at idle, but then again so did my XR6T and that didn't have them. As for the BPT Underdrives. SUPERB in my book.
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F6 Typhoon's Numbers 333.
Shockwave
,
Pedders Shocks & Springs,Whiteline Swaybars, Manta Exhaust System, Twin 3 inch High Flow Cats & 4 inch Dump Pipe, Injectors and High Vol Pump, FPV Mats, Tinted Glass
Whhoooosssshhh

350rwkw XTREME EDIT
The Real Performance Thing
HSV What ?
and 013, Lightning Strike:
Twin 2.5 Mandrel Bent Exhaust, High Flow Cat, CAI & Pedders Suspension
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