I bought 95tsi awd and it already had a full set of underdrive pulleys on it.The guys on dsmtuners say that I should atleast put the stock crank pulley back on since they dont have dampeners and if your just racing thats fine but for ever day driving when you stay at one rpm it will be bad for the engine do to vibration. Is this true?
#7169, "RE: Is this true about ud pulley" In response to Reply # 0
True, although some people have run them for years with luck.. I personally wouldn't run an undampered UDP. I thought somebody made an UDP that was dampered awhile ago but I don't know if it's still available, and I believe it was pretty pricey.
#7170, "RE: Is this true about ud pulley" In response to Reply # 1 Sep-19-06 10:14 PM by eclipzGST
Buschur had one I believe and yes it was pricey. I guess it's really up to you whether or not you want to chance it for a pretty minimal power gain. I'll also say that as many times as I've heard they are bad, I've never really heard of someones engine failing from not having a harmonic balancer. Hell, 1/2 the people I know don't have balance shafts... Don't quote me on any of this though. If I were you, I'd do some more research here as well as other DSM forums. I'm sure the topic has been covered pretty thoroughly.
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#7171, "RE: Is this true about ud pulley" In response to Reply # 2
Originally posted by eclipzGST Buschur had one I believe and yes it was pricey. I guess it's really up to you whether or not you want to chance it for a pretty minimal power gain. I'll also say that as many times as I've heard they are bad, I've never really heard of someones engine failing from not having a harmonic balancer. Hell, 1/2 the people I know don't have balance shafts... Don't quote me on any of this though. If I were you, I'd do some more research here as well as other DSM forums. I'm sure the topic has been covered pretty thoroughly.
I've never heard of this concern with the 420a. Everyone raves about the afx up. Why is that?
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#7174, "RE: Is this true about ud pulley" In response to Reply # 5
Well there's a few reasons for having a harmonic balancer.. It helps smooth the vibrations on the "free" end of the crank making it easier for the bearings to keep the crank in place. It helps absorb the shock from the engine going under load and unloading. Helps reduce vibrations transferred to the belts and other pulley's. In theory some think running an undampered pulley will cause premature wear on the bearings and cause crankwalk.
#7175, "RE: Is this true about ud pulley" In response to Reply # 5
Originally posted by CarbonFiberRST
Originally posted by StreetRacer_21 Because we don't have balance shafts
Half the people EclipzGST knows don't have them either.
True, but the afx unit is also balanced and not completly aluminum. I have never had any problems with mine, and never heard of any. Turbo cars are a different story though
#7177, "RE: Is this true about ud pulley" In response to Reply # 8
Originally posted by eclipzGST
Originally posted by StreetRacer_21Turbo cars are a different story though
That's why we're having this discussion. If we were talking about NT cars, it wouldn't be in this forum.
But he asked a question that related to the non turbo cars... He said why haven't I ever heard of this problem with the 420a, everyone raves about the afx
#7178, "RE: Is this true about ud pulley" In response to Reply # 2
Originally posted by eclipzGST Buschur had one I believe and yes it was pricey. I guess it's really up to you whether or not you want to chance it for a pretty minimal power gain. I'll also say that as many times as I've heard they are bad, I've never really heard of someones engine failing from not having a harmonic balancer. Hell, 1/2 the people I know don't have balance shafts... Don't quote me on any of this though. If I were you, I'd do some more research here as well as other DSM forums. I'm sure the topic has been covered pretty thoroughly.
Balance shafts are COMPLETELY different than a harmonic balancer. Balance shafts balance NOTHING. They just counter the vibration made by the engine with it's own vibration so the driver doesn't feel it as much. It has NOTHING to do with engine balance. Harmonic balancers however actually balance the crank.
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