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Old 02-21-2005, 08:01 PM   #1
quicksilver
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UDP news - you be the judge

UDP's for our cars have caused a bit of controversy. Do they or don't they do harm?

I called Ford Motorsports tech line to inquire about the Ford Racing UDP sold in the catalog. Of course they have never heard of problems w/ UDP's. I specifically requested that they ask a powertrain engineer for feedback. He took my info and told me that he would contact one of the engineers and let me know.
After one week he called back to tell me that the engineers give UDP's for the Focus a thumb's up. It will not cause any problems. He didn't have a good answer as to why the stocker had a rubber core. I can surmise that it is likely to reduce the effects of the a/c kicking on/off... I dunno.


I feel a little better about putting an UDP, but not completely relieved. I would think that they would have run the idea of an UDP by the engineers before they put it in the catalogue, but Ford doesn't exactly have the greatest credibility.

Only time will tell!


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Old 02-21-2005, 10:27 PM   #2
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Wait, who did this engineer work for?
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Old 02-21-2005, 10:47 PM   #3
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where are these stories causing harm? i dont think i've notcied any posts or threads on the boards(then again i am sometimes blind). are you really just worried about them harming your car? many users on these boards have them and as i've said i havnt seen any threads about them(not to mention on any of the other car boards i read: UDP are a very common mod on various cars and i dont recall ever seeing problems from them)
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Old 02-21-2005, 11:35 PM   #4
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Well the problem most people are worried about is the udp causing the alternator not to work properly and end up causing your battery to run out of power. Also there have been questions raised about the udp overheating.
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Old 02-22-2005, 06:36 AM   #5
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Engineer = Ford

Harm - Read AEM's website about UDP's. To contrast, read Unorthodox.
The issue - Do undampened UDP's cause main bearing wear which can lead to crank failure.

According to Ford for the Focus - NO.
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Old 02-22-2005, 11:32 AM   #6
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No problem with mine.(Ford Racing UDP crank pulley) Also ran 130,000mi. on my 5.0 Mustang with all 3 UDPs and never had Battery/Alt or overheating problems.Which was a major question here in the desert,when I first put them on.
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Old 02-22-2005, 06:47 PM   #7
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UDP's effect Civics and Miatas....something with Oil Pumps. Dont know where I read it, but when I had my Miata, I wasnt about to try it.

Also; Re: Oil Pumps...the pump is driven by the crank, right? If you get a UDP, you in turn spin the pump slower. I was told 7300 is the redline for the SVTF due to the pump. But, if you have a UDP, cant you then spin another ~300 crank rpms and be safe? Anyone? Turbo Tom scared me to the point where my limiter is at 7300.....if I can do 7600, I will cuz it sure sounds cool!
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Old 02-22-2005, 06:57 PM   #8
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If the oil pump is driven by the crank, a UDP will certainly not slow it down.
7,300 crank rpms is still 7,300 crank rpms, UDP or not.

Now, if the pump was somehow driven off the serpentine belt, you may be on to something.
Though, I'm relatively certain, it's not driven by the belt, or any other accessory that's turned by the belt.

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Dude! You've got 666 posts.
Put another one up quick!

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Old 02-22-2005, 07:06 PM   #9
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I think the complaints about UDPs are more gneralized become some engines are internally balanced and some aren't. Those that aren't will suffer from a non-balanced UDP. The Focus engine is internally balanced, so we are okay.
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Old 02-22-2005, 07:31 PM   #10
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Quote:
Originally posted by AmazonRacing
UDP's effect Civics and Miatas....something with Oil Pumps. Dont know where I read it, but when I had my Miata, I wasnt about to try it.

Also; Re: Oil Pumps...the pump is driven by the crank, right? If you get a UDP, you in turn spin the pump slower. I was told 7300 is the redline for the SVTF due to the pump. But, if you have a UDP, cant you then spin another ~300 crank rpms and be safe? Anyone? Turbo Tom scared me to the point where my limiter is at 7300.....if I can do 7600, I will cuz it sure sounds cool!
WD40 is right. The layout will vary from engine designer to engine designer, but the oil pump is never driven by the serp. belt. Typically, they are either driven off the timing belt/chain or through a gear train inside the block. Just think, if you lost a serp. belt, you'd lose oil to the engine...not a good thing!
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