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a vile merchant
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714 Posts
Discussion Starter #1
Has anyone tried underdrive pullies on a fairly stock 5L? The yanks rave about them so I'm wondering what sort of gains there would be.. Any adverse effects?
 

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Lamahs approve of manuals
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1,382 Posts
Adverse effects depend on what system you underdrive, and how much. e.g. alternator will drop power ( you might lose charge when you run lots of gear at once), and water might increase your temp, meaning you need better radiator etc.
Usually you can get a fairly happy medium tho (the stock systems have a little extra margin built in).
Not too sure on power gains however.

Heres one thread of info: http://www.fordforums.com/showthread.php?t=39948

There are a few more if you try a search or two . . .
 

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100MPH Hunter
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1,045 Posts
I know there is a Ford Motorsport Set around brisbane somewhere, they are suppose to fit.
 

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boosted sleeper
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4,575 Posts
I like the thought of this except running the alternator at lower volts. Is this dangerous? Will there be any undue stress on other components?
 

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100MPH Hunter
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1,045 Posts
It is supposidly better as the ancillilaries run slower and therefore the life of these is extended. It should only be a problem if you run big steroes at idle.
 

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a vile merchant
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714 Posts
Discussion Starter #7
Thanks Dodgie, that's the one i've been looing at. I sent them an email but no response so far. Did you find much improvement from it and how much did $$$? How's the alternator charge and water temp?
 

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Registered Snooser
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579 Posts
They may take a few days to respond, but barry batten is helpfull.
I can't recall the pulley price (round $140-150+postage)
you will need another drive belt also.
I picked my belt up from B.S.C. motion tech (bearings/belts specialist)as it was cheaper to do this than buy one from battens(I also get trade price),just ask for a part number for the belt from Battens, they were more than happy to help me out.
A small improvement in the seat of the pants, main benafit is you wont be thrashing your power steering pump etc.
Voltage can drop a bit if your idling with an amp pumping out rockabilly...(or swing!)
My water temps were fine, but I have thermos with an adjustable thermostat switch,and a 180deg coolant thermostat.
I had to cut my crank pulley bolt off with a grinder/cutting disc as the B!^ch of a thing wouldnt budge,apart from that it is an easy mod to do
 

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345kw of V8 Windsor Power
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2,784 Posts
I also run the Batten Performance one and am very happy with it. The pulley was $165 and the belt was $80 but that may have changed by now. You can't really get a better $$$ for kw mod than the underdrive pullies.
 

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do YOU have rubber?
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2,357 Posts
dodgie and EDXR8, could you get in the car and really feel the difference? You guys seem to rave about it! Have you got dyno figures before and after? This may very well be my next mod !!

Dodgie, where in Brisbane do you live? I'm at wilston.
 

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345kw of V8 Windsor Power
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2,784 Posts
Yeah the difference was noticable. Read any mustang forums and its generally the first mod they do. Just give Barry at BPT an email, he designed and tested them himself. He told me 10rwkw (7.5rwkw) for a standard XR8.
 

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do YOU have rubber?
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2,357 Posts
I've already emailed him and am waiting for a reply. Do you mean 10rwkw (7.5rwhp??). Does it alter the idle speed or make the idle rough?
 

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345kw of V8 Windsor Power
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2,784 Posts
No 10rwhp which is equal to 7.5rwkw (1kw = 1.34hp). Idle speed or quality does not change, it mainly affects mid and high range power. The more you rev it the more power the underdrive pullies will give you.
 

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do YOU have rubber?
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2,357 Posts
Ooops, yeah that's what I meant ;) I'll see what Barry has to say. They are based in Perth aren't they? Does the battery charge rate slow to the extent that you get starting problems if you mostly do short trips?
 

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345kw of V8 Windsor Power
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2,784 Posts
I have a 1000Amp dry cell battery, so can't really say for sure. At idle, it dosn't charge the battery at all, but even with the stock pulley, I don't think it charges that much anyway. As soon as you accelerate, there is only minimal charge difference. If you plan on idling the car for a long time with stereo and amps running you might have problems, otherwise it should be fine.
 

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do YOU have rubber?
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2,357 Posts
Sorry for all the questions but my other concern is cooling. I've just got hot summer days in traffic jams in my mind! Will the car generally be able to behave at idle?
 

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boosted sleeper
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4,575 Posts
I reckon it should behave better if you have the EL thermos fitted. But then again, that will drain more power down low if they are pumping at idle. What do you reckon wll happen if that was the case EDXR8?
 

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345kw of V8 Windsor Power
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2,784 Posts
Yeah, if your cooling system isn't up to standard, there could be overheating problems. As for charging, all you would have to do if you were worried would be throw it in neutral or rev the thing to give it a bit more charge. As with any mod, there are usually downsides, but the good thing with this is it is only 4 bolts to remove it and throw the stock pulley back on.
 

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Registered Snooser
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579 Posts
!Gn|T|0n ,
I am in Ashgrove.
Just a note, when my radiator was flushed out a few years ago they got about a fist full of casting sand out of it...Generally I think the biggest factor is the charging issue, as EDXR8 said just kick it into neutral for a few minutes and rev it at 1500rpm or something, the volt meter then starts to go back up. I would think if your cooling system is up to scratch you should be fine.
 
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