Powerfc Hc And New O2 Sensor

[Spook's_Skyline]

ok, got a new o2 sensor today

what readings should it be getting on the pwrfc hc?

always reads between 0 and 1 volt, what sort of values should i see at crusing?

how can i tell if my new o2 sensor is making a difference?

can i at all?

[RANDY]

AFAIK it should be constantly bouncing around when you're not in closed loop. And it should always remain between 0 and 1v.

If you put your boot right in, it'll jump up... but generally it'll move around like a cat in a washing machine.

[Spook's_Skyline]

yer, it does!

[paulr33]

then it should be fine, see how fuel economy is. make sure 02 feedback is turned on also.

[Spook's_Skyline]

yer, i just did that (after reading the faq!)

is it turned off be default on powerfc?

[paulr33]

default is on for 02 feedback

[paulr33]

default for all functions in ETC, FUNCTION SELECT for powerfc is ON

[Spook's_Skyline]

mmm, my tuner must have turned it off then

[paulr33]

it may be normal to turn it off when doing afr tuning but it should be put back on

[Thunderbolt]

While in light cruising conditions, mine cycles from around 0v to just over 1v. When at idle it reads an almost constant 1.2v.

[Spook's_Skyline]

ok, thats totally different from mine;

perhaps sr20s o2 sensors work differently from r33 ones!

what sort of fuel economy u get thunderbolt?

i did a few coasty runs with my new o2 sensor and it doesnt seem to be any better

ill give it a few tanks of petrol though before i start worrying

[Cubes]

My fuel economy has always been fairly good until recently.

My o2 sensor would flick 0-1v roughly once every 3/4 of a second. ~350-380km's per tank driving it fairly lightly.

Prior was ~430km's with the 3ltr or prior with the rb20det 470km's per tank when fuel economy was what I consider good.

I Replaced o2 sensor, response was slightly quicker but still hung around the .8-.9v and 0.2v for longer than I liked, it still had crappy economy.

I ripped out the injectors replaced them with gtr cleaned items that flow within 1% of each other, trimmed fuel to 58.5%. Instantly fuel economy dropped down to 11.6l/100km's. It had a slight flat/dead spot just before boost was made, as boost began being made the o2 sensor would read 1v. :S

I had all the closed loop area's tuned to as close to 14.7:1 as possible. Just out of closed loop afr's were adjusted to 13.5:1.

Zero vacuum afr's are now 13:1, as boost is starting to be made it begins to drop down in to the 12:1's.

The base map was leaned off in the closed loop areas, just out of closed loop was richened up to achieve the 13.5:1, zero vacuum and on boost afr's were leaned off.

Torque feels like its up as it drops out of closed loop but just before it begins making boost.

Accelerating is pretty much always just out of closed loop but just before boost is made.

Fuel economy has dropped down to ~10.6L/100km's... yipeeeyaaayea...

[Spook's_Skyline]

woah

thats a lot of tweaking

im wondering what else can cause bad fuel economy

mines been pretty bad for a while;

ive changed the throttle body (i believe im using a ford 80ml one)

would that effect fuel economy?

any other tips i can try at home to increase fuel economy, just a little?

i seem to be locked into 300k/s tank regardless of booting it or cruising

[paulr33]

easiest way is to get your tuner to plod around with you in the car with the wideband 02 plugged in and check the afr's on the road, especially in the first 8x8 cells