Subject	Main causes of missing under high load?
Posted by	Evan_Wright (Ca) on July 10, 2012 at 1:24 PM
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Message	Ever since installing leader gears I've been missing or hesitating under full throttle but only after it reaches higher rpm's. Before leader gears I never had issues with 14psi on 91 octane, 17psi on 100 octane, and 21psi on q16. After leader gears it hesitates even with base boost (10psi on 91octane) but only when heavily loaded(full throttle and upper rpm range). My initial thoughts were spark blow out but I haven't touched them and have not had problems pre-leader gears. Perhaps a failing fuel pump or fuel pump controller? My afr stays steady at 11:1 to 11.5:1 while at wot so I don't think that is the issue. Maybe I need to data log fuel pressure to see a dip in pressure? Any chance my z needs to re-tuned? Could the leader gears change the engine load enough to put me in less then ideal cells in the timing and fuel maps?
Follow Ups	Main causes of missing under high load? - Evan_Wright (Ca) 13:24:35 07/10/12 Did you check to make sure something wierd like timing hasnt - Red Hawk (CO) 14:03:01 07/10/12 Timing is still fine. And although I recently had my engine - Evan_Wright (Ca) 14:18:25 07/10/12 Re: Main causes of missing under high load? - Stadsport (PHX) 17:31:24 07/10/12 The plugs have around 5k on them and they looked great - Evan_Wright (Ca) 18:17:02 07/10/12 I resolved this problem by installing Iridium spark plugs. - ThunderZ 20:30:52 07/10/12 Yep. Seems like heat range 7 is what SZ is recommending - MixManMash 21:12:56 07/10/12 But does it make sense that I would need to switch plugs - Evan_Wright (Ca) 21:48:08 07/10/12 It could be possible. If you have a log of before the gear - MixManMash 08:17:19 07/11/12 Interesting update. Drove it to work today and it idle'd - Evan_Wright (Ca) 12:57:42 07/11/12 strongly suggest that, my gauge has saved me multiple times (n/m) - Red Hawk (CO) 16:12:36 07/11/12 Re: Main causes of missing under high load? - unfamous 23:48:00 07/11/12 Thanks for the suggestions. Have recently checked those all - Evan_Wright (Ca) 23:55:46 07/11/12
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