different readings?lc1 gauge and dataloging
 

i was street tuning my car the other day, and got it to run 11.1-11.3 afr@wot
i did a datalog and it says that i never even toutched 11' on the whole run.more like 10.6-10.8.

my lc1 gauge is wired to the same wire that goes to my MS on the center plug.

if both are on the same wire, how can i have different reading?i did perform a free air calibration before tuning it. on iddle, cruise and normal driving both are the same,wich seems to be weird.

thanks for your time

voltage offset.

and for the frensh-speaking that knows next to nothing to voltage,could you explain?

both the gauge and the ms wouldn't have the same reading because i ''splitted'' the signal?

it's the ground wire that's the problem.

ground goes straight from the lc1 module and bolts right up on the valvecover. i also got a suplementary ground on the same bolt going to the firewall

where did i went wrong?

does the megasquirt ground at the valve cover and/or firewall?

since it's a PNP, it use the oem grounds. i couldn't say wich one it is ,but i kept all of em.

having 2-3 ground on the same bolt could cause that kind of problem?


thanks a million for the info

have the grounds on different bolts is the problem.

wow, having the 2 ground in the same place but on different bolts will cause a voltage offset...WHO WOULD HAVE EVER GUESSED THAT!

they are all on the same bolt, on the VC.why this kind of post weaver

why not?

I've noticed that on my adaptronic also. Gauge says 14 or something, adaptronic says 13.5. (serial to adaptronic, 1 wire to gauge, both gauge and the lc1 are connected to the same + and ground source).

Electrons, are they positive or negative? Wait, batteries don't store electrons?

I've got the same issue and mine is wired into the stock ground. It's 0.7-0.8 off.

Try mixing E85 and gasoline in the tank until the AFR numbers match.

:slap:

Not sure which to trust now either.

Hustler, i'll bring out the crazy white wig and the test tubes at the gas station while i'm at it LIKE A BOSS


When the employee comes out of the shit box and asks what am i doing i'll tell him i'm going back to the future.