Subject	I wouldn't totally trust a stock tach accuracy
Posted by	turbomaniac on November 09, 2006 at 7:07 AM
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In Reply To	An reply to BigTdogg to my post, When drag racing or posted by Eishozzzz on November 09, 2006 at 06:16 AM
Message	don't know how fast our ecu clock is or how many clock cycles it takes for our ecu to sample a piece of engine data (rpm), make a caculation with it, and excecute what's neccesarry (add fuel, decrease fuel,cutoff fuel), but I would think it would have to be at least in the low ms range(probably µs range) since engine conditions usually changed pretty quick. I don't think the ecu would have a problem detecting it, unless whatever sensor is used to detect rpm has a slower ramp-up time than our engine. Than again it wouldn't makes sense to use a sensor that slow for a critical part. Ash of anyone would probably know this answer since he's an ecu guy. I think the stock tach is just not mechanically accurate enough at high rpms to be able to tell, I dunno...
Follow Ups	An reply to BigTdogg to my post, When drag racing or - Eishozzzz 06:16:53 11/09/06 Wrong, your tach is probably slightly off at higher rpm - Crim 07:02:24 11/09/06 I wouldn't totally trust a stock tach accuracy - turbomaniac 07:07:21 11/09/06 actually I don't even think the ecu has to do any - turbomaniac 07:19:15 11/09/06 The stock tach is only off by 2/3 hundred RPM. Not 1/2 K rpm (n/m) - Eishozzzz 15:16:40 11/09/06 When you miss shift, an ECU can't do anything to avoid the - TheTwinZ (Peru) 07:27:35 11/09/06 Another action would be to automatically press the clutch... - TheTwinZ (Peru) 07:43:17 11/09/06 Easier said than done. You're there b4 you know it. (n/m) - SuparexTT 19:39:31 11/09/06 That's an accidental downshit. - Kenny 07:59:56 11/09/06 I see :) (n/m) - TheTwinZ (Peru) 08:16:21 11/09/06 Haven't let one go accidentally in at least a few years ;) (n/m) - Kez43 11:07:02 11/09/06 I let one go when no one is in ear shot :) (n/m) - AzHeat 18:21:16 11/09/06 Please, stick to eating crayons. (n/m) - Kenny 07:59:12 11/09/06 Sometimes you are inspired. - Technomancer 18:55:01 11/09/06 You don't think the ECU is smart enough to detect a - BigTDogg (MA) 09:56:36 11/09/06 another issue with missing a shift.. - TURBO GAGE 12:36:48 11/09/06 Momentum would stop it from accelerating past... - Kenny 14:55:56 11/09/06 Actually, friction would stop it... - BigTDogg (MA) 15:29:34 11/09/06 One more time... - Kenny 15:37:25 11/09/06 Actually you gain momentum when you go from load - AzHeat 18:31:33 11/09/06 Wrong. - Kenny 18:40:51 11/09/06 Think of a bow & arrow or sling shot. In gear the - AzHeat 18:55:28 11/09/06 Unloading the engine decreases the mass just like - AzHeat 19:08:44 11/09/06 Please, read my post again. (n/m) - Kenny 22:06:54 11/09/06 Don't think so.... - RSR 08:50:21 11/10/06 <3 (n/m) - Kenny 10:06:24 11/10/06
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