Subject	I think its dependent on the HP the car is producing.
Posted by	AshsZ (FABio) on February 25, 2003 at 11:55 AM
	This message has been viewed 127 times.
In Reply To	I Have Heard Some Bad Rumors about Lightened crank pulleys.. posted by 5liter-eater on February 25, 2003 at 11:16 AM
Message	The more HP it puts out, the more tortional deflection the crank experiences. THere are a number of guys out there with NA's running UD pulleys forever without problems, but, those cranks are only being subjected to 200 ft/lbs of torque too. High HP Z's making 400ft/lbs should be more careful of this. The stock pulley is designed to minimize crankshaft resonation and it does that for only about a 10HP loss. Its just not worth it when you are making 400+HP to get 10HP more at that kind of sacrifice. [ ashleypowers.com ] [ agpowers@bellsouth.net ] [ Zemulator Information Sheet ] Enthusiasts soon understand each other. --W. Irving. Are you an enthusiast?
Follow Ups	I Have Heard Some Bad Rumors about Lightened crank pulleys.. - 5liter-eater 11:16:38 02/25/03 Absolutely, 100% YES, they are the worst thing EVER!!! (n/m) - my91z 11:19:41 02/25/03 Every last person who has used one has hda their engine blow (n/m) - my91z 11:20:14 02/25/03 They are SO bad oil will shoot out of your engine the > - my91z 11:20:38 02/25/03 thats enough girly man (n/m) - TARGETZ 12:34:23 02/25/03 Uh-huh.... a bit late on that comeback, eh? (n/m) - my91z 12:37:23 02/25/03 My 91 Z - seoulski 10:45:13 02/26/03 I was going to lay into you, but I'll take the high road> - my91z 16:11:49 02/26/03 Please use SEARCH for "underdrive pully" (n/m) - YugoBernie (NoVA) 11:22:29 02/25/03 yes/no (n/m) - genic 11:25:53 02/25/03 maybe (n/m) - Spee 13:03:58 02/25/03 so? (n/m) - -Ever- 13:13:14 02/25/03 I have over 20,000 miles and no problems. :) (n/m) - Spongerider (Now PFC) 11:27:55 02/25/03 There is a huge debate on this >>> - Mal1ce 11:28:32 02/25/03 Do Not Get one, IMO - WhiteOutZ 11:40:37 02/25/03 according to ASHs logic, Detonation is OK. Ask AK[zip] (n/m) - niXit 11:43:26 02/25/03 Where did you get that from? - AshsZ (FABio) 11:50:48 02/25/03 umm...haters? I don't think so - aliaZ 12:03:23 02/25/03 I wasn't pointing fingers. (n/m) - AshsZ (FABio) 12:52:20 02/25/03 Ok (n/m) - aliaZ 12:54:09 02/25/03 Aren't you going to soak people for the same price? - Turbodog (CT) 12:37:51 02/25/03 Nope. My ECU upgrade that is the same kind of upgrade as JWT - AshsZ (FABio) 12:46:07 02/25/03 what about dual MAFS? - aliaZ 12:57:28 02/25/03 I will have a dual-intake setup which will not require - AshsZ (FABio) 13:25:41 02/25/03 I'm more interested in the benefit of running... - aliaZ 13:39:16 02/25/03 Dual-intake splits the air between two filters so you - AshsZ (FABio) 13:42:00 02/25/03 ok I misunderstood (n/m) - aliaZ 14:35:17 02/25/03 Why not do a MAP sensor...much better for high Hp... (n/m) - Kyle(Houston) 13:39:32 02/25/03 The ECU uses a VE calculation to determine engine load - AshsZ (FABio) 13:44:33 02/25/03 Everything I have read, has said MAP is very innaccurate. - niXit 14:13:23 02/25/03 Hmmm - Marshall 14:24:14 02/25/03 Any race car I have ever seen has had a Map sensor---> - Kyle(Houston) 07:40:48 02/26/03 Yeah, having one for 85K w/ 205K on motor is WAY unreliable. (n/m) - my91z 11:49:27 02/25/03 You also have an NA. (n/m) - AshsZ (FABio) 11:52:03 02/25/03 Which sees redline everyday it is driven...your point is? (n/m) - my91z 11:53:53 02/25/03 Its not specific to RPM - its specific to torque. - AshsZ (FABio) 11:57:25 02/25/03 I agree with this (n/m) - aliaZ 12:04:39 02/25/03 I don't buy it. I think it's an NVH issue >> - my91z 12:18:37 02/25/03 Ok. (n/m) - AshsZ (FABio) 12:21:29 02/25/03 So this is Ash's opinion, not yours then? (n/m) - Woody75 (Denver) 11:56:12 02/25/03 Oh boy.. Thanks for the support, but you're gonna get it.. - AshsZ (FABio) 11:58:24 02/25/03 nice blanket statement :-/ (n/m) - aliaZ 12:05:35 02/25/03 Yup. (n/m) - AshsZ (FABio) 12:22:02 02/25/03 I see your pattern, "yup, ok", I like that new you =) (n/m) - ZEngineer 12:27:26 02/25/03 Hmmmm... My engine has a little shimmy between 2200-3500>>> - Bobby12many 12:05:06 02/25/03 I know what you're talking about... - ZEngineer 12:07:50 02/25/03 Damn does it bother me... (n/m) - Bobby12many 12:14:19 02/25/03 Mine does too - Marshall 12:21:50 02/25/03 yes, but mine's a separate issue - ZEngineer 12:30:30 02/25/03 I know what you are talking about>>> - Bobby12many 12:36:33 02/25/03 yes, make it stop Bobby, MAKE IT STOP!! =( (n/m) - ZEngineer 12:42:37 02/25/03 Oh, I will. :) New DS, Diff Bushings, Trans Isol Mount go on - Bobby12many 13:51:50 02/25/03 I have a great diff bushing writeup here if you need it (n/m) - ZEngineer 14:05:09 02/25/03 If youre referring to the one Mike(my91z) wrote, I got it :) - Bobby12many 14:16:38 02/25/03 yup, that's the 1. You're all set I guess, good luck (n/m) - ZEngineer 14:25:50 02/25/03 Sounds exactly like my car... Exactly (n/m) - Bobby12many 12:32:43 02/25/03 Check your U-joints, my Jeep does that when they R going out - my91z 12:50:57 02/25/03 that is possible. - Marshall 13:29:39 02/25/03 dont be surprised if as you're checking it, - ZEngineer 14:10:01 02/25/03 You're probably right. - Marshall 14:26:07 02/25/03 You forgot the key words, was it a tested on a VG or - Spongerider (Now PFC) 12:17:38 02/25/03 Shorter crank only means the resonant frequency is higher - AshsZ (FABio) 12:33:21 02/25/03 Nope... - Spongerider (Now PFC) 12:48:15 02/25/03 Ok. (n/m) - AshsZ (FABio) 12:50:43 02/25/03 that's overly simplied - Marshall 13:10:15 02/25/03 It is possible to move the resonant frequency out of range? - Marshall 12:55:07 02/25/03 In a good design, yes but > - kuah@splparts.com 13:05:30 02/25/03 Nope. Harmonics allow lower frequencies to amplify higher - AshsZ (FABio) 13:06:13 02/25/03 Re: Shorter crank only means the resonant frequency is higher - SactoTodd 12:55:35 02/25/03 An ant can carry many more times its own weight. (n/m) - AshsZ (FABio) 13:39:40 02/25/03 I got this information from Jim at Sunbelt in GA >>> - Mal1ce 17:52:00 02/25/03 no problems here. (n/m) - wickdGSXR 11:47:22 02/25/03 I think its dependent on the HP the car is producing. - AshsZ (FABio) 11:55:25 02/25/03 Agreed, NAs will last long, but a high HP TT will not enjoy - George(boostsolutionsinc.net) 12:03:14 02/25/03 Yep. - Dallas DamonZ 12:15:33 02/25/03 I ran an underdrive pulley from late 97-late 00 and *NEVER*> - Kyle(Houston) 12:21:50 02/25/03 *shrug* - AshsZ (FABio) 12:24:21 02/25/03 LOL.....True..I just have never seen any *actual* proof---> - Kyle(Houston) 12:30:21 02/25/03 I will agree with that. A friend here had an odd plug - AshsZ (FABio) 12:41:01 02/25/03 And what do you suppose a lightweight flywheel does to the > - my91z 12:44:53 02/25/03 harmonic dampers are filled with rubber - Marshall 13:03:19 02/25/03 ?? I don't see your point? The "damper" is still tuned> - my91z 13:14:31 02/25/03 I'll reply with Kuah's answer- it doesn't need to be tuned. - Marshall 13:24:38 02/25/03 Just like shocks on a car don't need to be tuned 2 the mass? - my91z 13:28:37 02/25/03 The shocks on a car should just dampen anything - Marshall 13:36:44 02/25/03 Actually, the damper compression and rebound, but >> - my91z 13:51:00 02/25/03 it's possible... - Marshall 14:13:46 02/25/03 flywheels do nothing to dampen harmonic vibrations - aliaZ 13:08:40 02/25/03 And I said any of this where? >> - my91z 13:17:39 02/25/03 It would actually lower the tortional flexion because - AshsZ (FABio) 13:09:19 02/25/03 Did anyone actually read my post? - my91z 13:31:18 02/25/03 Yup. I answered. (n/m) - AshsZ (FABio) 13:38:30 02/25/03 I did. - Marshall 13:46:21 02/25/03 That is how it operates. It dissipates the vibration - AshsZ (FABio) 13:55:34 02/25/03 You need to look at it in the relative oreders of magnitude> - my91z 14:01:36 02/25/03 Yes I understand that. - Marshall 14:19:55 02/25/03 Such dampeners do not need to be "tuned" for a frequency - kuah@splparts.com 13:10:22 02/25/03 You are re-iterating what I said. I said that by changing > - my91z 13:27:28 02/25/03 Re: You are re-iterating what I said. I said that by changing > - kuah@splparts.com 13:45:50 02/25/03 I agree about the fixed end point, I hadn't thought > - my91z 13:57:29 02/25/03 I guess I was overzealous, it would reduce the effcetivness> - my91z 13:33:52 02/25/03 I have the ASP UDP on my NA, - shawn300zTT 12:23:44 02/25/03 I have installed well over 150 UR Pullies...... - Specialty-Z 13:11:50 02/25/03 Greg do you have the picture of the whole stack of about 40 - YugoBernie (NoVA) 13:59:02 02/25/03 I have it somewhere at home...it's great! (n/m) - SeedyROM 14:18:29 02/25/03 Find that sh!t for me please. (n/m) - YugoBernie (NoVA) 14:55:27 02/25/03
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