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Old 01-10-2006, 07:48 PM   #1
silvialost
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red

Default ver2 sti dyno--afr spike?

here is the torque and horsepower.


and here is boost and afr.


any one know what the freak out could be from. this was on the stock ecu with 93 octane.

mods include
fujitsubo exhaust
greddy ebc.
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Old 01-10-2006, 08:07 PM   #2
hondaeater69
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is that car MAF or MAP fueling based? maybe check those sensors depending on which it is. You can see a huge dip in power when it happens though, probably knocking. It also to appears to have gotten worse with pulls (assuming the red line is the first pull).
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Old 01-10-2006, 08:20 PM   #3
silvialost
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the red was the first pull.
2nd pull i then toyed with the ebc to get more boost and response from the turbo(raised the gain and the start boost). that was the huge spike.
3rd pull i turned the gain and start boost down but not to original levels.

car is primarily maf based but it does appear to have a map aswell.
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Old 01-10-2006, 09:14 PM   #4
hondaeater69
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well it sounds like for whatever reason she didn't like the extra boost, but i have no idea why that would cause you to lean out like that. . .let me think for a while.

edit: maybe fuel cut from running too much boost. But in that case i would imagine your boost would have been cut for real (doesn't appear to really drop on the graph)
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Old 01-11-2006, 08:01 AM   #5
silvialost
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the computer cant cut boost. its not controlling it. i have a greddy profec b spec II ebc. so what is the computer doing?
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Old 01-11-2006, 12:09 PM   #6
hondaeater69
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strange. I wonder if it sees too much boost if the ecu is cutting fuel momentarily? I know the more modern ecu's do not act this way but maybe the older ones do.

Sorry i couldn't be of more help. . .
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Old 01-11-2006, 01:34 PM   #7
ride5000
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post maf/pre turbo induction leak.
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Old 01-11-2006, 02:30 PM   #8
Jaxx
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mmm but then it sealed it self??

ill guess fuel cut too
hks fuel cut defenser ftw?
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Old 01-11-2006, 06:09 PM   #9
silvialost
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man more money. i guess ill invest in a fcd. if that dont work i have no clue.
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