Heavily retarded (!) on full throttle / very low rpm !?

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RomChip200
 

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Joined: Mon May 11, 2009 7:58 pm
Location: FRANCE

Heavily retarded (!) on full throttle / very low rpm !?

Post by RomChip200 »

I have a trouble that doesn't occurs on full acceleration in the high rpm range:
When accelerating from 3000 to 6000rpm from partial to full throttle, the right timing values of my table are reached: 23° @ 15psi @4500rpm

But when accelerating on full throttle from very low rpm (1500 / 3rd gear / pedal floored), it goes till a point where the timing is heavily retarded and really doesn't match my timing table, there're more than 6° missing !!
It doesn't correspond to any retarded table.
My knock timing = regular timing.
I suspect it has to do with the knock learn region but I don't detect the knock:
My bin is instrumented to monitor knock_count variable @0x14BD and to detect when switching to the knock timing table (bit2=0 when knock map is used in flags @0x5A).
When detected, I switch on the dashboard engine light. And during my tests, no light. I ran unleaded 95 in the past (100% E85 now) and the light went on very quickly on full load (too much advance / octane rating), then my routine works.
I don't monitor knock_inc @0x14CF yet.

Have a look to the pic and the corresponding log file.

Any thoughts ?
Attachments
good _timing_FT.jpg
(253.24 KiB) Downloaded 3654 times
heavily_retarded_FT.jpg
(252.26 KiB) Downloaded 3655 times
NIStune_2009-08-22_2209_46.csv
(396.19 KiB) Downloaded 282 times
Matt
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Post by Matt »

what about disconnecting knock sensor and replacing with resistor? that would get rid of knocking theory

can you attach a log file for this one?
RomChip200
 

Posts: 426
Joined: Mon May 11, 2009 7:58 pm
Location: FRANCE

Post by RomChip200 »

Log file is just below the pictures:
NIStune_2009-08-22_2209_46.csv

Matt wrote:what about disconnecting knock sensor and replacing with resistor? that would get rid of knocking theory

can you attach a log file for this one?
[b] Custom tunes S13/Z32/GTIR. First Z32 flex fuel (E85/unleaded) [/b]
[b] 300ZX Z32 '90 400ch 100% E85[/b]
[b] 200SX S13 '92 220ch 100% E85[/b]
[b] Audi S4 B5 '99 400ch 100% E85[/b]
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