Diferents AFR Reading between the LC-1 gauge and Megatune

For discussing how to choose sensors and create a wiring harness for all Bowling and Grippo versions of the MegaSquirt® EFI controller.
Forum rules
Read the manual to see if your question is answered there before posting. Many users will not reply if the answer is already available in the manual.

If your question is about troubleshooting, configuration, or tuning, you MUST include your processor type (MS-I or MS-II) and code version in your post. If your question is about PCB assembly or modifications, you must also include the main board version number (1.01, 2.2 or 3.0).

If you have questions about MS1/Extra or MS2/Extra code configuration or tuning, please post them at www.msextra.com Such questions posted here will be moved to: a temporary MSextra sub-forum, where they will be removed after 7 days

The full forum rules are here: Forum Rules, be sure to read them all regularly.
Post Reply
trdae86gts
MegaSquirt Newbie
Posts: 3
Joined: Mon Aug 11, 2008 9:43 am

Diferents AFR Reading between the LC-1 gauge and Megatune

Post by trdae86gts »

i have aquestion about the reading
of the LC-1 and MegaSquirt
look i have diferentes Reading
between the LC-1 gauge and the MegaSquirt
for example in the LC-1 gauge i have 10.0AFR and the MegaSquirt Have 12.9 AFR
why ?
loren
Helpful Squirter
Posts: 52
Joined: Mon Nov 19, 2007 8:27 pm
Location: Safety Harbor, FL
Contact:

Re: Diferents AFR Reading between the LC-1 gauge and Megatune

Post by loren »

Check your grounding. Everything should have an individual ground wire and go to the same grounding point, preferably on the engine block.

If you have the MS and the LC1 grounded at different points, the difference in "ground" potential can be a volt or more, that's likely what's throwing off your AFR readings in the MS.
LBC + Technology = ???
LT401Vette
Master Squirter
Posts: 481
Joined: Sat Jul 16, 2005 7:07 am
Location: Charlotte, NC
Contact:

Re: Diferents AFR Reading between the LC-1 gauge and Megatune

Post by LT401Vette »

Also check what LC1 you set it up as in MegaTune. There are a couple of LC1 options, primarily the :
LC1 Default that is 0-5V, 7.35:1 -22.05:1
and the commonly used:
Innovate LC1, PLX 0-5V 10:1-20:1

If you haven't reprogrammed your LC1, you should stick with the LC1 Default.
Phil Tobin
EFI Analytics, helping to simplify EFI with Next Generation tuning software.
http://www.tunerstudio.com/
http://www.efiAnalytics.com/MegaLogViewer/
Android Shadow Dash MS: http://tunerstudio.com/index.php/shadowdashmsmenu
Post Reply