Subject	More thoughts on this - it might be that the pulley set is
Posted by	robo (sebring1970) on July 18, 2021 at 6:34 PM
	This message has been viewed 192 times.
In Reply To	I have all the pulleys, and I think there is some synergism posted by robo (sebring1970) on July 16, 2021 at 02:51 PM
Message	a more beneficial mod at lower horsepowers and for NA's, as a percentage improvement and whether or not it hold as the crank. I have an unmolested longblock, but anything and everything that can be bolted on for improved performance has been changed. That statistician in me knows that my sample of size of two underdrive pulleys on two different twin turbos Z's has no power but paralysis by analysis is not my style. I want to scuff my underdrive pulley. The nice thing about friction coefficients is small changes can make big differences. I haven't decided how to do it yet. Suggestions? 800 grit emory paper by hand? Acid bath? "Straight-line acceleration is probably the first aspect of automotive performance that any intelligent driver gets bored with." Peter Gregg "We owe a lot to the dragsters. They always break something, figure out a way to beef up the part and then the benefit trickles down." Robo "Not everything that can be counted counts. Not everything that counts can be counted." Einstein
Follow Ups	Underdrive Pulley question…is everyone changing all - Z-line 19:04:40 07/14/21 Crank pulley and water pump - Drk93TT 19:13:15 07/14/21 Re: Crank pulley and water pump - Mike@ZSpeed 19:17:36 07/14/21 Indeed - Drk93TT 19:20:38 07/14/21 Thx for the input. That’s enough for me to skip it. (n/m) - Z-line 20:14:16 07/14/21 If interested, I have a stock size lightweight pulley that I - Mr.Stacy 07:36:11 07/15/21 I changed them all - got the UR kit from CZP. That said, - Woodnutz (PA) 20:35:47 07/14/21 UR crank pulley, rest stock, no issues ... - ConVerTT 00:01:16 07/15/21 No issues as well (n/m) - bbug 08:09:43 07/15/21 True - Drk93TT 15:02:20 07/15/21 Truth! (n/m) - ConVerTT 20:28:16 07/15/21 Crank UR v1 and HI water pump. (n/m) - Bernie (NoVA) 01:22:42 07/15/21 Charging issues with underdrive pulley? (n/m) - ForceFedTT 16:04:13 07/15/21 Not that I've seen ever. Only time I have seen charging iss - MixManMash 17:49:37 07/15/21 No (n/m) - ConVerTT 20:28:39 07/15/21 And ... - ConVerTT 20:30:37 07/15/21 i use an ATI race damper with an UR power - slayer fan 18:47:11 07/15/21 I have stock sized UR pulley I would let go for cheap - komplexZTT 09:03:13 07/16/21 Same issue here, I hate the underdrive pulley, worst mod (n/m) - ZaXxon 12:35:59 07/16/21 I have all the pulleys, and I think there is some synergism - robo (sebring1970) 14:51:05 07/16/21 More thoughts on this - it might be that the pulley set is - robo (sebring1970) 18:34:01 07/18/21 I would consider sandblasting with medium sand - ZXoltan 07:55:27 07/19/21 Thank you. I like your suggestion. I read once that the - robo (sebring1970) 13:28:02 07/20/21 It didn't make any noise before your replaced the alternator - Bernie (NoVA) 00:30:01 07/21/21 it was making noise before I got the car home - robo (sebring1970) 14:29:47 07/21/21 Didn't make any noise when I drove it for weeks before. (n/m) - Bernie (NoVA) 20:31:48 07/21/21 you probably put a small fraction of the miles on it that I - robo (sebring1970) 14:50:14 07/22/21
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