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Old 07-26-2005, 23:50   #1 (permalink)
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Underdrive pulleys for ba xr8

hi im looking at getting a set of Underdrive pulleys for my xr8 just wondering what peoples addvice on them are and if any one as had trubble with them on the 6spd box . What brand would u recomend and should i got for the street or race series
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Old 07-27-2005, 00:37   #2 (permalink)
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Re: Underdrive pulleys for ba xr8

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Originally Posted by tufesp351
hi im looking at getting a set of Underdrive pulleys for my xr8 just wondering what peoples addvice on them are and if any one as had trubble with them on the 6spd box . What brand would u recomend and should i got for the street or race series
I'm running bpt race underdrives, had them fitted by Michael at omega automotive in Guildford, Sydney(really knows his stuff). No probs so far on my 5 spd box but they've only done about 5,000km. From what I understand a clutch upgrade is more or less inevitable with these cars if you mod them and give them a bit - as you would expect with any car. Underdrives seem to work well though - motor tends to rev up a lot quicker, as if you were in a lower gear.
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Old 07-27-2005, 01:12   #3 (permalink)
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Re: Underdrive pulleys for ba xr8

I can back Daves recommendation of Omega Automotive. Give Michael a call and he;ll let you know. No known issues with a 6 speed as a number have already been done without any problems.
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Old 08-01-2005, 02:21   #4 (permalink)
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Re: Underdrive pulleys for ba xr8

What sort of Dollars would you be looking at to have one supplied and fitted?
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Old 05-26-2006, 02:12   #5 (permalink)
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Re: Underdrive pulleys for ba xr8

i had problems with my underdrives would suck the clutch to the floor aparently very few do it and the only way to fix it was too upgrade clutch
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Old 05-27-2006, 04:28   #6 (permalink)
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Re: Underdrive pulleys for ba xr8

In the last issue of Blueprint FPV suggested (in fact it was a full page article) that modifying your underdrive pulley was very risky as it impacted on the balance of the engine and it's ability to run correctly.
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Old 05-27-2006, 22:51   #7 (permalink)
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Re: Underdrive pulleys for ba xr8

Keep away from them all together, They are more trouble than there worth.
Nearly all the so called Ford enhancment joints have them & have had trouble in one sort or an other.. They also give very little in the way of power increase.
As has been mentioned: read the last issue of blueprint that will open your eyes to the trouble they can cause...
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Old 05-28-2006, 00:07   #8 (permalink)
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Re: Underdrive pulleys for ba xr8

I think you you will find they give a better power increase to a Auto and probly less trouble.
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Old 05-29-2006, 03:00   #9 (permalink)
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Re: Underdrive pulleys for ba xr8

Some of the underrive pulleys available, use no apparant harmonic balancer weight which has been blamed for some of the problems and they are meant for 4.6 motors not our 5.4, powerbond make a underive pulley that still retains a full balancer and I have not heard of any problems with these ones, but not to say there has been no problems.



If you beleive everything ford try to tell you, we would all leave our cars dead stock knowing that is the best power we will get and they will never be a problem.
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Old 05-29-2006, 18:34   #10 (permalink)
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Re: Underdrive pulleys for ba xr8

Quote:
Originally Posted by ratter
Some of the underrive pulleys available, use no apparant harmonic balancer weight which has been blamed for some of the problems and they are meant for 4.6 motors not our 5.4, powerbond make a underive pulley that still retains a full balancer and I have not heard of any problems with these ones, but not to say there has been no problems.



If you beleive everything ford try to tell you, we would all leave our cars dead stock knowing that is the best power we will get and they will never be a problem.
I for one can say that in using both UD bpt and powerbond, That the BPT under drives are in fact made fo the 4.6 not 5.4 and will 100% cause your engine to fail due to the oil pump gears even though they are a known issue, It just speeds up this process.

The Powerbond UD on the other hand are in fact fantastic once I'd fitted the UD I noticed that the engine was nicer on idle and thoughout the rev range , As for power I haven't lost anything in the way of performance , Still one of the quickest street trim GT out there. So I would have to say there a good thing.
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