Hondata S300 & AEM 30-4100 UEGO Values problem

[RofromNorCal]

Ok i have Hondata S300 v2 setup on
a P05 ECU
on 1998 Acura Integra
Serial Number is 20849

the AEM 30-4100 UEGO is wire like this
Red wire to yellow/green on the cigarette Light
Black wire to the body ground
white wire to Hondata Analog Input pin A0 Red wire

the problem i have is the Value on the AEM 30-4100 UEGO gauge will
read 14.7

while the Hondata SManager will read
13.5,14.4,13.6,14.8

it will fluctuate on the Hondata SManager
i have play with the offset
and i have move ground to G101
i ran two grounds in a splice
and saw no change....

the ground is right now is mount to kick panel side of the pass side

thank you for you time
RO

[Spunkster]

Do not use the cigarette lighter as a power source. You should use one of the empty switched power sources on the fuse box. The ground should go to the thermostate houseing.

http://www.hondata.com/techplxwiring.html

[RofromNorCal]

what is the cause of fluctuate on the Hondata SManager
and ill try that
and let you know

[Luke]

@spunkster: can you, please, explain, why we shouldn't use the cigarette lighter as a power source?

best regards Lukas

[Spunkster]

We have seen many problems with people that use it. The Fuse box has empty spots for this that do not involve cutting and splicing wires and is a much better source of power.

[RofromNorCal]

We have seen many problems with people that use it. The Fuse box has empty spots for this that do not involve cutting and splicing wires and is a much better source of power.

ok so i did what you said
and i ran the power wire to the under dash fuse box
fuse 18
which is (RUNNING LIGHT RELAY) 7.5A Canada option
there was no wire running from the fuse box on the connector pin
so ran the power wire to empty pin on the connector side with 10A fuse in place on the fuse box


the value did change a bit but it does not fluctuate as bad

AEM 30-4100 UEGO gauge will
read 14.7

SManager will say
14.24, 14.82, 14.35, 14.52, 14.72, 14.26, etc it will just fluctuate

but before you say "use the ground should go to the thermostat housing"
i ran 3 grounds
i ground it to kick panel side of the pass side, metal brace in center console, and the thermostat housing
and then just to the thermostat housing....
and found no changes

so could it be the
AEM 30-4100 UEGO gauge to the Hondata?...
or the Hondata it self?...

[Luke]

you can see it as you want:

first option: the UEGO is too slow to determin those changes on its display
second option: the hondata is too fast and determins it.

you will never get a 100% exact reading. reasons for that: your air supply is everytime slighty different, so your revs aren't always the same and therefor you'll never get exactly 1274 revs (for example) where the exact amount of fuel is injected for 14.7 AFR.

my knowledge says me: get as close as you can get. more isn't so necessary.

the maps are just "stationary points" for some revs and pressure values. the values in between are calculated by the ECU ;)

best regards Lukas

[surfingsk8r]

you can see it as you want:

first option: the UEGO is too slow to determin those changes on its display
second option: the hondata is too fast and determins it.

you will never get a 100% exact reading. reasons for that: your air supply is everytime slighty different, so your revs aren't always the same and therefor you'll never get exactly 1274 revs (for example) where the exact amount of fuel is injected for 14.7 AFR.

my knowledge says me: get as close as you can get. more isn't so necessary.

the maps are just "stationary points" for some revs and pressure values. the values in between are calculated by the ECU ;)

best regards Lukas

THIS

[Luke]

if you want to know some more about what I was talking about, you could use your maths book and look up something about interpolation or read this: http://en.wikipedia.org/wiki/Interpolation

although many people talk about "learning by doing", the real gains you get if you know something about the theories behind the scenes ;)

best regards Lukas