Subject	What controls the amount of VTC timing advance?
Posted by	Zarcasm(Hfd, CT) on April 20, 2010 at 6:13 PM
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Message	The VTC solenoids are either ON or OFF but the VTC cams are continuously variable throughout their range of travel. Does the ECU and VTC selonoid (1) signal to "change" the VTC timing where the actual timing advance is set by oil pressure, or does the ECU/VTC selonoid (2) force the VTC cam to go the full travel as quick as the oil pressure allows it to go? If the answer is it's meant to be continuously variable does anyone have the expected VTC control schedule as a function of rpm, or whatever? I'm looking for a more precise answer than the "low to medium" speed description given in the FSM. Zarcasm(Hfd, CT) view My Technical posts (click here) view My General posts (click here)
Follow Ups	What controls the amount of VTC timing advance? - Zarcasm(Hfd, CT) 18:13:19 04/20/10 IIRC VTC solonoids are duty cycled - Spddracer 19:44:17 04/20/10 I believe its just off of oil pressure. - Machtavian 20:00:06 04/20/10 I think you'll find it engages above idle... - zx299 20:12:50 04/20/10 Thats what I said. (n/m) - Machtavian 20:51:31 04/20/10 Where did you come up with the 2,500 rpm number? - Zarcasm(Hfd, CT) 21:20:16 04/20/10 That's where Greg D. sets them to come on if my memory - Machtavian 21:29:43 04/20/10 nope, try again (n/m) - Seb@Specialty-Z 23:32:10 04/20/10 My understanding of the VTC system..... - zx299 19:54:48 04/20/10 They are either on or off depending on engine load. - Ash's Z 19:55:30 04/20/10 Interesting , I must be thinking too new ;) - Spddracer 20:14:36 04/20/10 This was supposed to be... - xpwarrior 20:52:16 04/20/10 Thanks Ash. Ever heard of a VTC acting lazy and sluggish? - Zarcasm(Hfd, CT) 21:12:02 04/20/10 I have a hard time visualizing the VTC mechanism being - Ash's Z 07:36:11 04/21/10 Does the a/f schedule directly depend on VTC advance? - Zarcasm(Hfd, CT) 19:02:23 04/21/10 It's a simple on/off mechanism with the control variables - LitlElvis 07:04:52 04/21/10 is this the reason for the caps on the back of them melting? - LJZTT 15:14:08 04/21/10 No relationship whatsoever - LitlElvis 16:22:24 04/21/10 Thanks LitlElvis - Zarcasm(Hfd, CT) 19:12:56 04/21/10 My guess is the closed loop a/f adjustments do not base - LitlElvis 23:08:42 04/21/10 I recently used ATF to clean out the oil - Zarcasm(Hfd, CT) 20:10:20 04/22/10
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