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Chris86NA2T
Joined: 28 Jan 2008
Posts: 1
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 Posted: Mon Jan 28, 2008 5:17 am Post subject: electrical load and AFR changes.. |
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just a little background here.. i have an 86 300zx with an 88t computer, dsm 450cc injectors with dropping resistors and a z32 AFM.. i have a boost referencing 1-1 aeromotive adjustable fuel pressure regulator with the pressure set at just around 43 psi.. i am using nistune and an LM1 to control things.. i am having a difficult time setting the latency and k value. my problems are similar to herbs problems several posts down. before i start getting terribly worried about that problem i have a few things to test for such as intake leaks.. my biggest problem that has me stumped relates to my electric fan. its a fairly large fan that takes a 30 amp fuse, and has popped 25 amp fuses.. when the fan kicks in i have huge drops in air fuels across the board. they drop as much as 4 full points.. if im idling in the 14s with the fan off, it will drop to the 10s with the fan on.. the fan is powered directly from the battery and i have tried grounding it in several different places with the same results.. with the fan on, battery voltage drops about 1 10th of a volt (13.8 to 13.7). no other logged values in nistune change with the fan coming on.. the fan is controlled by a painless wiring thermostatic fan controller.
i cant think of anything else to check to try and solve this problem. does anyone have any insight? thanks |
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cb_drift
Joined: 04 May 2004
Posts: 472
Location: New Zealand
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| Posted: Tue Mar 04, 2008 9:08 pm Post subject: |
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where is your air intake compared to the flow your new big fan creates?
disturbed airflow across the intake of the afm - any disturbance - will affect the afr's really.... |
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