War and Peace . . . Me and my LC-1 - Miata Turbo Forum - Boost cars, acquire cats.

MEGAsquirt A place to collectively sort out this megasquirt gizmo
Sponsored by:
Sponsored by:

War and Peace . . . Me and my LC-1

Old 07-04-2011, 10:07 PM
  #1  
Elite Member
Thread Starter
iTrader: (3)
 
Join Date: Mar 2008
Location: Granbury, TX
Posts: 6,128
Total Cats: 645
Default War and Peace . . . Me and my LC-1

As the title implies, I've struggeld with my LC-1. The two main issues I've had are:

1. The dreaded "Error-8"; and
2. Even when the LC-1 wasn't keeled over with Error-8, accuracy as read by my MSPNP was suspect.

So, hoping that others might gain from my struggles . . . :

Error 8:
Error 8 is pretty nasty. It essentially puts the LC-1 into a failsafe mode where it outputs 0VDC on its analog output wire. This, of course, means it is useless for tuning or closed-loop mixture control (probably the reason that you bought it, right?).

The LC-1 documentation describes Error 8 as a "timing error" resulting from either overheating or sensor damage. Taking Innovative at their word, I dutifully had a new sensor bung welded in just upstream of the cat and moved the sensor. Alas, that had no effect.

Moving on to cause number two, I dutifully replaced the sensor. Again, no effect. Me not happy. Abandoning Innovative as being inept due to downsizing, I moved on to the forums . . . hmmm . . . I'm not alone. It seems that Error 8 is a common error with firmware version 1.10. That firmware has shipped with every new LC-1 since 2007, and is still shipping today. The fix for many . . . revert to firmware version 1.00.

Recently, Innovative has acknowledged that there is an Error-8 problem with firmware version 1.10 and has been working on a solution. This has resulted in Beta firmware version 1.20. This is the firmware I've been running for the past week. I've had no further Error-8 issues and everything else seems to work well.

So, if you have Error-8 and firmware 1.10, the first thing you should do is a firmware change, either to 1.00 or Beta 1.20. I've attached all of the LC-1 firmwares to this post in a zipfile.

Accuracy:
Since installing my turbo, I've noticed that my MegaTune AFR readout generally does not agree with the AFR reading on my VEI gauge. As a rule, the MSPNP seems to read high (lean) with the result that I've been running richer than desired (which, at least, is safe).

Anyways, I was tired of the situation, and decided to get everything calibrated and matched. The calibration tool I used was a $3.50 linear taper 50KΩ potentiometer from radio shack.
Name:  IMG00262-20110704-1731.jpg
Views: 911
Size:  59.7 KB

I used test cables to connect my high-tech calibration tool to my MSPNP and VEI as follows:
Red Cable -- Common 12VDC source for MSPNP and VEI, connected to one of the outer tabs of the pot.
Black Cable -- Common signal ground for MSPNP and VEI, connected to the other outer tab of the pot and the negative cable of the multimeter.
Green Cable -- Common input line for the MSPNP and VEI LC-1 analog signal, connected to the middle tab of the pot and the positive cable of the multimeter. Note that the LC-1 needs to be disconnected for this calibration.

Here's a picture of the setup:
Name:  IMG00259-20110703-2256.jpg
Views: 891
Size:  61.3 KB

With this setup, I was able to input a reliable DC voltage into the signal input of the MSPNP and VEI. I could read the DC voltage on my multimeter. After setting up my MSPNP for LM-1 emulation (nominally 0VDC = 10:1 AFR and 5VDC = 20:1 AFR), I recorded the following linear relationships:

0.0VDC MSPNP=10.0:1 VEI=10.0:1
5.0VDC MSPNP=20.8:1 VEI=20.4:1

So, both devices were off a little with pretty normal component variances (in other words, yours WILL be different). Easily fixed though. For the MSPNP, I'm not aware of an adjustment that can be made . . . however both the VEI and LC-1 can be adjusted. I adjusted the VEI endpoints so that I got an exact match on the VEI display and Megatune -- confirmed by swinging through the range of input voltages with my high-tech tool. I then setup my LC-1 to output 0VDC at 10.0:1AFR and 5VDC at 20.8:1AFR. Viola! Calibrated.

Now to do some autotuning.
Attached Files
File Type: zip
LC-1 Firmwares.ZIP (35.9 KB, 525 views)
hornetball is offline  
Old 07-04-2011, 11:38 PM
  #2  
Senior Member
 
Lokiel's Avatar
 
Join Date: Dec 2009
Location: Brisbane, AUSTRALIA
Posts: 688
Total Cats: 92
Default

Originally Posted by hornetball View Post
: I then setup my LC-1 to output 0VDC at 10.0:1AFR and 5VDC at 20.8:1AFR. Viola! Calibrated.
:
OK, you've now calibrated your "Viola", how's the LC-1?
Lokiel is online now  
Reply
Leave a poscat -1 Leave a negcat
Old 07-05-2011, 12:32 AM
  #3  
Elite Member
Thread Starter
iTrader: (3)
 
Join Date: Mar 2008
Location: Granbury, TX
Posts: 6,128
Total Cats: 645
Default

Originally Posted by Lokiel View Post
OK, you've now calibrated your "Viola", how's the LC-1?
Unfortunately, outside of doing the free air calibration on setup, there's not much you can do to verify the LC-1 (unless you have another known good WBO2 installed to check against). But, at least I'm down to only that source of error.
hornetball is offline  
Old 07-05-2011, 09:43 AM
  #4  
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 75,274
Total Cats: 2,152
Default

One of the benefits of MSII and MSIII is that you can recalibrate the O2 input on the fly.

I have to use .22v = 7.35 and 5v = 22.39 instead of 0-5v to have mine match.
Braineack is offline  
Old 06-07-2012, 11:57 AM
  #5  
Junior Member
 
Join Date: May 2010
Posts: 93
Total Cats: -1
Default

Newb: where do you input those values Brain? I have an MTX-L, which uses the same values as the LC-1 right?

Thanks
MoonieGT is offline  
Old 06-07-2012, 12:01 PM
  #6  
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 75,274
Total Cats: 2,152
Default

calibrate AFR.
Braineack is offline  
Old 06-07-2012, 12:07 PM
  #7  
Junior Member
 
Join Date: May 2010
Posts: 93
Total Cats: -1
Default

Thanks. I found that menu, but then was not sure which wideband option to pick. Is it the LC-1 or the generic one at the bottom (don't remeber tbe name, linear something...)? Thanks again.
MoonieGT is offline  
Old 06-07-2012, 12:14 PM
  #8  
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 75,274
Total Cats: 2,152
Default

custom linear and type the values in.
Braineack is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Tony the Tiger
Miata parts for sale/trade
63
12-29-2016 03:23 AM
Joe Perez
Current Events, News, Politics
8
09-30-2015 05:41 PM
UrbanSoot
Miata parts for sale/trade
20
09-12-2011 02:36 PM
GTS Miata
MEGAsquirt
6
09-30-2007 01:09 PM
KPLAFIN
General Miata Chat
14
08-30-2007 12:29 AM


Thread Tools
Search this Thread
Quick Reply: War and Peace . . . Me and my LC-1


Archive Advertising Cookie Policy Privacy Statement Terms of Service

© 2018 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.