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ecu alt control

Old 10-31-2006, 08:51 AM
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Default ecu alt control

seems like i remember hearing somwere that at wot the ecu turns the altenator output off or down for less engine load? any body know if this is true or not specificly on 88-91 civic/crx.

Beau
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Old 10-31-2006, 10:06 AM
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Default Re: ecu alt control

I find that hard to believe. The alternator's resistance is proportional to the current drawn from it. It works like a motor in reverse.

There is no way of engaging or disengaging it. Not electronically any how.
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Old 10-31-2006, 10:58 AM
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Default Re: ecu alt control

I think it's a possibility. The more demand that's on the alternator, the more torque it takes to turn it.

Ever turn your lights on and notice your engine load up a tiny bit?
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Old 10-31-2006, 11:06 AM
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Default Re: ecu alt control

Originally Posted by DrSeuss
I find that hard to believe. The alternator's resistance is proportional to the current drawn from it. It works like a motor in reverse.

There is no way of engaging or disengaging it. Not electronically any how.

Go read up on how alternators work then.

The output can vary depending on the field strength of the static coils. Those coils are energized by the battery providing more output, so yes the output of the alternator can be varied by the ecu.


You could probably google this and find out. Stop disbelief and go research. :P



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Old 10-31-2006, 11:45 AM
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Default Re: ecu alt control

Originally Posted by jagojon3
This may have nothing to do with the your question (what exactly are you trying to do?) but...

On my eg the alternator output would drop down to around 12.5V at idle unless the headlights were on. If they were on then it stayed at 14.4V. My car would sometimes stutter and even die at idle, until I figured out that if I kept my A/C switch on, it always outputs 14.4V and my car has never died at idle since. I don't have a/c, I just hooked a switch up to the ecu for FTL so it's not like I have a compressor running constantly.

Do you by chance run Uberdata. I had major problems with this as well when I ran uberdata. The ecu would drop the alt control output when the ELD voltage was low. The low output voltage would cause the injectors to provide less fuel, thus causing a lean condition and stumbling at idle.

CROME has battery offset corrections for the injectors, but I haven't found the need to use them yet. 750's ran way better on CROME than on uber.



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Old 10-31-2006, 12:05 PM
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Default Re: ecu alt control

The old HFs had something like what you are talking about.
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Old 10-31-2006, 12:19 PM
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Default Re: ecu alt control

Originally Posted by Cray91
The old HFs had something like what you are talking about.

There is a script that someone made for crome too, but I haven't checked it out yet. Actually I think it is incorporated into the advance tables.



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Old 10-31-2006, 01:53 PM
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Default Re: ecu alt control

Originally Posted by jagojon3
I do, ------ Uberdata! I just run it because my car is tuned perfect, no need to change anything really. I tried disabling the ELD before and it didn't change anything. Keeping the a/c switch on completely eliminated the problem.

LOL, I did the same ----. Ya ELD disable doesn't work in UD.

Do you get the hesitation at around 10inHg too. That's because the O2 disable was coded really fucked up. It was done by bypassing some code with a jump. There is actually a byte option that can disable it. It modified my misc script to change the byte option not the jump around code crap.





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