Shane661
Needs a life
Posts: 11494
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posted December 17, 2009 02:28 PM
 Edited By: Shane661 on 17 Dec 2009 22:30
Lean Spikes/Data Logging Question...
I've noticed that after a high speed pass, when the throttle is chopped, the a/f will go out of range lean for a period of time. Sometimes several seconds or more, until I get back in the throttle.
What is the cause of this? Is it due to reversion in the exhaust? It always weirds me out to see those extended lean readings.
  
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KZScott
Needs a life
high on speed
Posts: 7235
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posted December 17, 2009 03:09 PM
Edited By: KZScott on 17 Dec 2009 23:12
completely normal, theres no load so dont worry about melting stuff. the injectors hardly fire when you chop the throttle. every 1/4m pass of mine looks like that
I have added fuel to the 0% tps in the upper rpm range. I was told it helps cool off the pistons after making a huge nitrous pass, it also helps rpm from cutting out if you use an inj signal for the logger. this can also look kinda cool as it will shoot fire out of the pipe if you have it hot enough
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00 ZX-12R 8.62 @ 165.2 no bars, slicks, Pump Gas, 55 shot.... turbo 8.32 @173
00 ZX-12R Fastest NA Kawasaki in the world 1: 222.046 1.5: 226.390 Loring AFB
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tshultz
Zone Head
Posts: 556
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posted December 17, 2009 07:36 PM
My lm-1 does the same thing. when it works that is
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shiphteey
Needs a job
Posts: 2529
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posted December 18, 2009 06:42 AM
Mine does that too.
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Gemini Motorcycles
Topping out everything from Ninja 250s to nitrous ZX-14s.
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2000redrocket
Pro
Posts: 1662
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posted December 23, 2009 05:30 PM
yep mine also but sometimes with the load it will go all the way rich and then go up to 19.5 lean. i have a screen shot of that if you want to see it.
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted December 28, 2009 05:29 AM
These ECU's shut off the injectors when the rpm is above a specific rpm and the throttle is 0%.
No big deal.
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Y2KZX12R
CompetitionCNC.com
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2000redrocket
Pro
Posts: 1662
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posted December 29, 2009 02:55 PM
my olg gpz 1100 it acted like a engine brake.
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