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Cat Temp Sensor Effect On A Power Fc

aphid

By aphid,
in Engines & Forced Induction

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aphid Proficient

aphid

Posted
Posted (edited)

Hey,

Just curious as to whether or not a Power FC retards ignition based on a high temp reading from the temp sensor that sits in the cat housing? I have a feeling it does, but just want to confirm it with other peoples experiences ;)

Cheers,

Marcus

Edited by aphid
paulr33 Grand Master

paulr33

Posted
Posted

nope it doesnt even look at the signal

you can disconnect it, and it will show as 5.0v in SENSOR CHECK and nothing else will happen

you can use the light circuit for your own demise if you wish, something like anti lag indicator or some external relay warning light

i thought about using it for my diff lock hack but couldnt be ass'ed in the end

aphid Proficient

aphid

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Posted

hrmz.. i had to cut the braided line just before it joins the sensor to get my exhaust off (long story..) and now i've got the constant warning on my dash..

i've just installed a new turbo / dump / screamer combo, the car runs fine however is seriously lacking in power, turbo lag is exceptional for the size of turbo i'm running and even when it does build decent boost it still doesn't feel like it has the power it should, as if the ecu is retarding the ignition constantly..

thinking back i recalled that when giving it some stick while tuning, if the engine check light came on (knock warning) there would be no cut in power, however if it was a seriouse enough knock and the engine exhaust temps were hot enough to set off the cat temp sensor then there would be an instant drop in power, as if the fc was retarding the ignition..

obviously this was not a frequent occurance, i think i might've done it two or three times, really not enough to confirm my theory, but i thought this would be a logical explanation for this problem..

incidentally my datalogit has decided it doesn't want to connect this evening so i can't confirm my theory that way either ;)

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