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Dangers from Underdrive Pulley- Fact or Fiction????

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Old 11-01-2001, 08:05 PM
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Dangers from Underdrive Pulley- Fact or Fiction????
Anyone who may have the technical knowledge to answer or comment, please comment on this article by Steve Dinan. Sounds like a pretty compelling argument to me...??? Anyone have any idea???

http://www.dinanbmw.com/html/danger_...er_pulleys.htm
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Old 11-01-2001, 08:34 PM
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not this again

One question......does Steve Dinan mod Nissans????

didn't think so.

some people have had these pullys on for over 2 years with NO PROBLEMS...actually no one has EVER had a problem on a maxima with a UDP. the UR UDP is actually BETTER balanced than the stock pully and the stock pully is NOT A HARMONIC DAMPENER.
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Old 11-01-2001, 09:02 PM
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I recall reading our engines are internally balanced. I also recall reading our engines do not require a harmonic balancer. It seems to me a light aluminum pulley presents less inertia than the stock steel pulley, thereby creating a smaller torsional load in the crank under acceleration/deceleration. As advertised.

Either the information *is* applicable to the BMW engine, or Dinan is providing a long-winded excuse for not providing a UDP to BMW owners. In any case, the Dinan article seems to speak to BMW owners only.
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Old 11-02-2001, 05:25 AM
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ARGH Search is your friend, really!!!!

NISSAN ENGINES DO NOT REQUIRE HARMONIC BALANCERS. They are INTERNALLY BALANCED. The Unorthodox Racing UDP (SS) has NO NEGATIVE EFFECTS on your car if you use the correct belts and tension.
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Old 11-02-2001, 05:32 AM
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I've been running my UDP for 2yrs (30K) and I love it. No major problems. (just an oil seal at 60K).
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Old 11-02-2001, 05:13 PM
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Harmonic Damper
If there is no harmonic damper, then why would Nissan build some sort of rubber compound into the stock pulley??
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Old 11-02-2001, 05:32 PM
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Re: Harmonic Damper
There was some big time drama on the e46 board and this article a while back. Go to my other site, www.e46fanatics.com and do a search if you really want to try and find it. It may have been before the new server though. I can't remember. This is OT.
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Old 11-02-2001, 07:17 PM
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It for a BWM, you can;t generilze german engineering with Nissan, smarts, they are totaly different.....
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Old 11-02-2001, 08:31 PM
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how much gain can u get out of them ??
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Old 11-02-2001, 08:37 PM
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Originally posted by Tri-lite
how much gain can u get out of them ??

5-9 at the wheels is whati heard, which doesnt seem that much, but really is...revs quicker too.
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Old 11-02-2001, 09:19 PM
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Originally posted by Tai Mai Shu



5-9 at the wheels is whati heard, which doesnt seem that much, but really is...revs quicker too.
ha

try 1 hp low end -1 high end
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Old 11-03-2001, 03:05 AM
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Re: Re: Harmonic Damper
Originally posted by NickStam
There was some big time drama on the e46 board and this article a while back. Go to my other site, www.e46fanatics.com and do a search if you really want to try and find it. It may have been before the new server though. I can't remember. This is OT.
dont see how this is OT. I think ur slippin my man.

Anyway, I think that the udp is all personal preference. some people swear by them and others hate them. good thing they arent all that expensive...
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Old 11-03-2001, 04:34 AM
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Originally posted by SprintMax
ha

try 1 hp low end -1 high end
pretty much. i had one and it was ok but i wouldn't spend hte money and the time again.
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Old 11-03-2001, 04:36 AM
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Re: Re: Re: Harmonic Damper
Originally posted by black019


dont see how this is OT. I think ur slippin my man.

Anyway, I think that the udp is all personal preference. some people swear by them and others hate them. good thing they arent all that expensive...
That article was written for BMW's. Their situation is probably different.
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Old 11-03-2001, 05:59 AM
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the only danger is that it doesn't work
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Old 11-04-2001, 02:12 PM
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Originally posted by SprintMax
the only danger is that it doesn't work
true
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Old 11-04-2001, 02:21 PM
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Originally posted by SprintMax
the only danger is that it doesn't work
sprint...I gained an average of 2 mph on my trap speeds with the UDP. at that was with a 25 mph headwind too!
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