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Old 01-19-2006, 12:07 AM   #1
imprezaBlue
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Wink noob utec question about map "0"

previous owner said he lowered rpm with utec.
i was wondering when i choose "o" in map selector, if car will use 100% stock set up.

or i have to adjust set up by using utec with my laptop again.

ps: anyone have good exp. with ATX tunning. in NNJ?

Thanks.

pps: i know it sounds noob.... but i still have to ask, because of lowering rpm or whatever you guys call, i will have bad MPG with check engine light on?
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Old 01-19-2006, 01:05 AM   #2
mcowger
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define 'lowering rpm'....what parameter was changed?
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Old 01-19-2006, 01:10 AM   #3
imprezaBlue
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Quote:
Originally Posted by mcowger
define 'lowering rpm'....what parameter was changed?
i am a noob.........
all i know is that when i start engine and warms up rpm is like 250 or somthing....
thanks.
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Old 01-19-2006, 02:33 AM   #4
Lost_Pete
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Map 0 is stock mode. The UTEC does not have control over the idle speed, it can adjust the upper rev limit both up and down.

regards
Pete
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Old 01-19-2006, 03:18 AM   #5
mcowger
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And you are not idling at 250 rpm, by the way.....
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Old 01-19-2006, 09:50 AM   #6
Freon
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I don't think the UTEC can change the rev limiter in stock mode. The UTEC has to be in control of fueling, and use open loop fueling to do this. In stock mode the factory ECU controls fuel.

Stock mode should do nothing but add fuel cut defender (unless you turned it off via the dip switch or toggle switch on the front).
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Old 01-19-2006, 10:34 AM   #7
ride5000
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Quote:
Originally Posted by Freon
I don't think the UTEC can change the rev limiter in stock mode. The UTEC has to be in control of fueling, and use open loop fueling to do this. In stock mode the factory ECU controls fuel.

Stock mode should do nothing but add fuel cut defender (unless you turned it off via the dip switch or toggle switch on the front).
that's correct.

however, the two-step rev limit DOES remain in effect.
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Old 01-19-2006, 02:02 PM   #8
Gethin
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maybe he removed some fuel down in the 500-1500RPM zone in 0% column? I can tweak my idle if I do this.
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Old 01-19-2006, 02:10 PM   #9
Freon
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You won't be able to idle at 250rpm. I just don't think it is possible to make the car stable that low. Changing the fueling with your UTEC won't affect this either. The ECU will compensate with fuel trim to run 14.7:1, ~650rpm by adjusting airflow, timing, and fueling.

You can adjust idle with DeltaDash, Ecuexplorer, or reflash.
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Old 01-19-2006, 02:45 PM   #10
Gethin
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But under OLF dosen't the UTEC directly fire the injectors and uses it's own background table instead of reading the ST and LT fuel trims? Confused!
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Old 01-19-2006, 03:09 PM   #11
ride5000
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Quote:
Originally Posted by Gethin
But under OLF dosen't the UTEC directly fire the injectors and uses it's own background table instead of reading the ST and LT fuel trims? Confused!
not while under the tps crossover point indicated in the OLF parameters.
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Old 01-19-2006, 03:20 PM   #12
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The UTEC cannot control idle. ^^^^

And just because the UTEC is in control doesn't mean the ECU isn't changing the trims. It is still reading its factory O2 sensors and attempting (futily, mind you) to trim fuel. I have seen a few times where after "spirited" driving coming to a stop and idling, the AF will be off, like 15.5:1 or 13.9:1. It corrects itself again, but it takes about 5-8 seconds.

BUT these trims will not affect the UTEC or affect your fueling while the UTEC OLF is in command.
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Old 01-19-2006, 05:24 PM   #13
Gethin
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Still confused here! According the the UTEC manual, the 0% column is used to tune all points in from 0% to 25% TPS. Above 25% TPS is uses columns 10-100 and uses the MAP sensor from 0PSI to 18PSI.

So as I read this, if you are off throttle completely, i.e. 0% TPS, it's using the value that is in the 0% column?

The Open loop TPS threshhold parameter I thought means the point at which it switches from the 0% column to the 10-100% columns?
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Old 01-19-2006, 06:47 PM   #14
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Quote:
Originally Posted by Gethin
Still confused here! According the the UTEC manual, the 0% column is used to tune all points in from 0% to 25% TPS. Above 25% TPS is uses columns 10-100 and uses the MAP sensor from 0PSI to 18PSI.
this is completely (and ONLY) true IF your tps crossover is set to 25.

Quote:
So as I read this, if you are off throttle completely, i.e. 0% TPS, it's using the value that is in the 0% column?
yes, as well as 1-24% throttle.

Quote:
The Open loop TPS threshhold parameter I thought means the point at which it switches from the 0% column to the 10-100% columns?
well yes, that's exactly what it is , but while you're in the 0 column you are using mafv offset of oem ecu tables, NOT the built in background OLF tables[*].

ken
[*] the caveat to this is when you are above 5500 rpms, in which case the utec is still going off its background tables.
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Old 01-19-2006, 06:57 PM   #15
Gethin
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Ok, so if it's a MAFV offset from the OEM tables, you can in fact adjust the idle? For example, if I change the value of -2.5 to -5 in the 0% column in my fuel table map at 500PRM I notice the idle drop slightly.....
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Old 01-19-2006, 11:12 PM   #16
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Quote:
Originally Posted by Gethin
Ok, so if it's a MAFV offset from the OEM tables, you can in fact adjust the idle? For example, if I change the value of -2.5 to -5 in the 0% column in my fuel table map at 500PRM I notice the idle drop slightly.....
That is not really controlling the idle.

The definition of controlling idle is that you would enter in the target idle speed and the UTEC would adjust the idle speed to that figure via a throttle air bleed control valve or via the DBW throttle control depending on the car.

regards
Pete
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Old 01-20-2006, 12:47 PM   #17
Gethin
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I know it's not proper idle control but it does affect my idle quite significantly. That was the point to my replies.
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Old 01-20-2006, 05:25 PM   #18
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watch your timing when u jump back and forth.....
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