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View Full Version : midnight lc-1 installation... wires?



dualaudi
03-04-2008, 01:09 AM
where/what's a good spot for the positive red accessory wire? (when the car turns on this red wire is hot, when off, it's cold)

dualaudi
03-04-2008, 01:29 AM
found it... very first block i guess...

dualaudi
03-04-2008, 03:29 AM
ok got the LC-1 installed... after a few recalibration sessions, it seems to be finally working.. up to 3rd gear at 7k i'm getting ~14.5... but in 4th WOT above 5k i'm getting 12.5afr.

1. That's lean correct?

TUNE: atp tweaked for t3/t4 57trim tune for 550'ccs....

(running a gtrs w/ 580cc's around 45psi right now) 16psi boost (wanted to go 20psi, but doesn't seem safe right now)

2. Do you think a walbro pump is needed to keep up with the injectors?

Side-Step
03-04-2008, 05:11 AM
I would get a fuel pump. My wife's car has the 255 walbro in it with 630's. I forget what the fuel press. is, but at WOT at 20psi the LM-1 is reading 11.4. Rich.
Normal driving high 13 to low 14 is normal I would think.

317ssayzarc
03-04-2008, 05:36 AM
i guess ill say it again, ditch the mika!

audisnapr
03-04-2008, 05:45 AM
I would get a fuel pump. My wife's car has the 255 walbro in it with 630's. I forget what the fuel press. is, but at WOT at 20psi the LM-1 is reading 11.4. Rich.
Normal driving high 13 to low 14 is normal I would think.

from what i've read, 11.4 (11.50) is dead on the money at WOT. 14.7 is ideal at idle and various readings in between are where we should be.

@ OP: 12.5 is lean at WOT, yes.

again, this is from everything I've read. I'm in the process of posting my LC-1 logs myself.

Monk
03-04-2008, 10:21 AM
up to 3rd gear at 7k i'm getting ~14.5... That's lean correct?

Yup.


Do you think a walbro pump is needed to keep up with the injectors?

That's what I did, and although it helped my AFR settle at an ideal 11.5 in the high RPMs, it also made my midrange very rich => Weird AFR Curve (http://www.audizine.com/forum/showthread.php?t=177203)

Note: I recently replaced my Bosch Supers (old 3 prong design) w/ my spare set of Beru Ultras (also 3 electrode type). Big diff. in throttle response, exhaust note, & butt-dyno power. Probably flattened the AFR curve quite a bit. I'll back it up w/ actual nos. when I get the chance.

audisnapr
03-04-2008, 10:25 AM
up to 3rd gear at 7k i'm getting ~14.5...

wow, I skipped right over this part. yes, like Monk said, that is lean - way lean actually if we are talking about WOT in 3rd up to and at 7K

dualaudi
03-04-2008, 10:31 AM
that's ~14.5 parts air for 1 part fuel?

so what's ideal? 11.9?

if so, then i'm getting richer in 4th above 5k rpm, so i'll adjust my fuel psi to accomodate the 3rd gear pull and try and bring that number down...

audisnapr
03-04-2008, 11:14 AM
that's ~14.5 parts air for 1 part fuel?

so what's ideal? 11.9?

if so, then i'm getting richer in 4th above 5k rpm, so i'll adjust my fuel psi to accomodate the 3rd gear pull and try and bring that number down...

correct - 14.5 air : 1 part fuel

I heard "ideal" is 11.5, but also hear anything in the 11.5~12 is good money.

dualaudi
03-05-2008, 01:26 AM
well, studs/bolts came off my TP to DP, so it's loud as he!!. can't run more tests due to bleeding ears. on the up side, ran a s2000 at 16psi only from 55-90, he didn't even pull from me, then I saw smoke in my cabin from the exhaust leak..

AudiRacerS4
03-05-2008, 07:49 AM
I heard "ideal" is 11.5, but also hear anything in the 11.5~12 is good money.

this is an ideal ratio for our cars [up]

mike-2ptzero
03-05-2008, 09:10 AM
How did you calibrate the wide band setup? It should be done in "free air" which means removing the sensor out of the exhaust or driving in gear but off the throttle so the injectors are closed. If it is done wrong the readings will be off.

dualaudi
03-05-2008, 09:33 AM
i don't think i calibrated it correctly, it was in the pipe. I'll have to recalibrate when I pull my TP to put new studs in.

SurferForever
03-05-2008, 11:53 AM
How did you calibrate the wide band setup? It should be done in "free air" which means removing the sensor out of the exhaust or driving in gear but off the throttle so the injectors are closed. If it is done wrong the readings will be off.

what about in the pipe but car off?

maxspeed
03-05-2008, 11:59 AM
14.5 at WOT = DONT GO WOT

SurferForever
03-05-2008, 03:15 PM
14.5 at WOT = DONT GO WOT

well then what should it be?

audisnapr
03-05-2008, 03:27 PM
from what i've read, 11.4 (11.50) is dead on the money at WOT. 14.7 is ideal at idle and various readings in between are where we should be.

^^^

SurferForever
03-05-2008, 05:47 PM
^^^ oh

mike-2ptzero
03-05-2008, 06:06 PM
what about in the pipe but car off?

Yes it can be done that way but the car must be cold and there cant be any exhaust fumes in it. Its just best to do it by pulling the sensor out.

dualaudi
03-07-2008, 08:41 AM
So, got some 630cc's, Recalibrated my wideband correctly.

Not sure if it's reading right or not. idles buried needle at 7.4, at boost or WOT 20.9 *grayed numbers.

It's almost like it's on or off - or completely going crazy. I'm using the logworks program on my laptop.

I've tried having the fuel as low as 30psi all the way up to 70psi... it miss fires crazy at 30 under WOT, and is less at 70psi. (pulled the plugs, and they are BLACK!)

I'm at a loss right now. the 580cc's ran better, but felt like it was lean above 5.5rpm.

Monk
03-07-2008, 10:15 AM
wait a minute . ..you switched injectors w/o adjusting your tuning? Plus, 630cc's are pretty big for the GTRS ( considering most files are written w/ 440cc's in mind).

Oh, and the readings are way off the charts . ..re-calibrate.

If your plugs are 'dry-fouled', it's a dead give away that fuel is not burning properly . ..either due to a rich mixture or plugs/ignition not functioning at an optimum level.

mike-2ptzero
03-07-2008, 10:30 AM
So, got some 630cc's, Recalibrated my wideband correctly.

Not sure if it's reading right or not. idles buried needle at 7.4, at boost or WOT 20.9 *grayed numbers.

It's almost like it's on or off - or completely going crazy. I'm using the logworks program on my laptop.

I've tried having the fuel as low as 30psi all the way up to 70psi... it miss fires crazy at 30 under WOT, and is less at 70psi. (pulled the plugs, and they are BLACK!)

I'm at a loss right now. the 580cc's ran better, but felt like it was lean above 5.5rpm.



Yeah those readings are just wrong, I would reset and recalibrate again.

dualaudi
03-07-2008, 10:37 AM
well, the tuning is for 550's but the previous owner of this software said he was running w/ 630's... I'll try and recalibrate again... would fouled bkr7's be an issue too? should i replace those with the new 3prong boch's i have? or wait till I get the fueling fixed, then put the new plugs in?

dualaudi
03-07-2008, 10:41 AM
What's the complete process of recaibrating? maybe i'm doing it wrong, thought i followed instr.'s

I don't have my button or the LED... so i ground the black wire for 3 sec. - car have to be on? or off?

Monk
03-07-2008, 10:46 AM
address fueling first, coz no matter how good your plugs are, they will prematurely fail if you're running overly rich.

mike-2ptzero
03-07-2008, 11:45 AM
What's the complete process of recaibrating? maybe i'm doing it wrong, thought i followed instr.'s

I don't have my button or the LED... so i ground the black wire for 3 sec. - car have to be on? or off?

Car does not need to be running but the wide band just needs to be powered.


If the car was running well with 580cc injectors and the FPR set at 45psi, this gives you a injector rating of 56.17 lbs/hr. To get that same injector rating with 660cc injectors you will need to run the fuel pressure around 34.75psi.

dualaudi
03-07-2008, 12:06 PM
every time I calibrate, i need to pull the wideband out? or (if the car has been sitting for 4 hours, can i calibrate with wideband inside the pipe?)

all i need to do is / 1. power it up / 2. ground black wire for 3 sec / start car? nothing else?

mike-2ptzero
03-07-2008, 12:18 PM
Is that what the instructions say?


I would just pull it out just in case since it really needs free air.

audisnapr
03-07-2008, 02:23 PM
I would remove it and calibrate it per the instructions.

4. Connect the sensor to the sensor interface connector. The sensor must be exposed to air for the first time calibration.



4.1 Free air calibration

To achieve maximum precision, the LC-1 and its sensor needs to be recalibrated frequently.
The sensor MUST be operated in free air for calibration.

Remove the oxygen sensor from the exhaust and expose it to free air (outside of the exhaust
pipe) for calibration purposes:

1. Connect the LC-1 to 12V from the vehicle and switch it on.

2. After the sensor has warmed up, either press the pushbutton or connect the calibration wire
to ground for three seconds and release.

3. After the calibration is complete, switch the LC-1 off and wait for 30 seconds before you start
the car.

If a LED indicator is connected to the calibration wire, it will be off during free air calibration.

audisnapr
03-07-2008, 02:29 PM
btw, you really should have that LED connected. This is the only real way to know if the LC-1 is operating correctly.

dualaudi
03-07-2008, 05:20 PM
ahh! i missed step 3 - turn off for 30 sec...

and ok, i'll have to get a new LED, cuz i burnt the last one on accident before i got to hook it up..

*called unitronics, they said 630's will never be good on a gtrs, they recommend their file on 440's for my turbo (dyno'd at 300awhp) 330 on some other kind of dyno - didn't understand his Canadian accent. ($890) future upgrades for larger turbos will be 50% of that price.

**But he said if i got a gt2871r, they are developing a program on 630's as we speak for that one - not released yet.