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shotwell
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Reged: 04/08/02
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Aren't there underdrive pulleys that fit on the power steering pump and alternator or something? I remember reading that somewhere...that wouldn't affect the dampening of the crank at all. I'm concerned because I hit the redline EVERY DAY, well, when it's running that is.
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'98 SVT Contour, in at least 639 pieces 
4 Speed MTX...synchro and shift fork replacement in progress 
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techme
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CEG'er
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Reged: 08/26/02
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Posts: 126
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Loc: Near St. Louis, MO., moved to Fayetteville, AR!
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Let me see if I got this right as a newbie. If I put a UDP on my '99 Countour SE 2.5l and rev
it high requently, I can expect reduce engine life? I read in a different post that the UDP only helps get to x rpm quicker and doesn't increase horsepower-maybe only responsiveness.
Thoughts?
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DemonSVT
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Hard-core CEG'er
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Originally posted by techme:
Let me see if I got this right as a newbie. If I put a UDP on my '99 Countour SE 2.5l and rev
it high requently, I can expect reduce engine life? Thoughts?
Yes. In theory that is exactly correct.
Running a UDP will worsen the crank whip and cause more damage to your engine.
The higher the rpms you take your engine to, the worse the whip & damage is. Therefore SVT's are likely to suffer more from this phenomenon since they make power well past 6000rpm where the stock Duratec falls on it's face.
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2000 SVT #674
13.47 @ 102 - All Motor!
It was not broke; Yet I fixed it anyway.
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Terry Haines
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4 engine teardowns for new crankshaft/rods in HMS Inc proves the point, lowest miles 38,000, highest 62,000.New crank ,in excess of $600, rods ,over $100 a piece + bearings + full gasket sets+head bolts + any other 'worn bits' + labor + a DMD (better late than never !!) 
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V6 MTX
'We are a 'shop' not a laptop 'MotorSports outfit!!....
'Its only nuts & bolts!'
Haines Motor Sports Inc,
Dealer for 'Quaife America'
SOLE USA Dealer for the American Axle 'AUSSIE BAR'...
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whitegt
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Reged: 01/31/02
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So if you have the DMD then it's ok to put UDP's on?
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2000 Tropic Green SVT Contour
Back to stock.....?
1991 Mustang GT
Oxford white
Lots 'O Mods awaiting P1-SC this summer
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Micah
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when I had a 2.5 in my car it did not fall on its face after 6k, whos car are you judging this on? everyone I have been to keeps going past 6k
Micah
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pre98@trudellbio.com
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Dan Nixon
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Originally posted by ScottK97SEMTX:
It is a tuned elastomer pulley which IIRC has a pretty narrow damping range (from tech tid bits from Terry and Judge), designed for cars that redline at about 7000 rpm. I would guess it is tuned for that range. Obvioulsy it has better "dual damping" for smooth operation, but is there proof that it'll be sufficient/better at 8000 rpm?
Actually, that is a good point/question..how effective is the DMD at controlling "whip" above factory redline. Does it work at 7.5K, at 8K? Judge, Terry, anybody know?
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1999 Amazon Green SVT Contour (#554/2760)
"People demand freedom of speech as a compensation for the freedom of thought which they seldom use."
-Soren Kierkegaard (as posted by Jato)
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JasonS
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A possible benefit of a UDP besides HP might be reduced frothing of the power steering fluid at high sustained RPMS...
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JasonS
2000 SVT #1119
Go: SHOshop Intake & y-pipe, Brullen exhaust,
Eibach springs, EBC TurboGroove rotors,
Corbeau seat, TRW 5pt Harness
Show: Knauberized, Clear corners
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Shaun G
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Originally posted by whitelx:
So if you have the DMD then it's ok to put UDP's on?
DMD and UDP are the same part. Except the DMD is heavier and reduces vibration. Personally, I think your crazy to run an underdrive pulley. Plus the DMD makes the car feel so much better at higher RPMs. As in mods this is one I highly recommend.
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JVT
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Over 40k on my motor w/ the pulley, no problems.... Yet.
Plan on buying the DMD later this year when I can justify the funds....
Anybody wanna swap a DMD for a Aussie bar? (I'm serious) I'll throw in a gutted MAF for free that you can try. All you'd need is a couple of brackets and new bushings. ($20)
-J
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'98 4Runner
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