MSefi.com read only forum (Jan.15,2018)

Ok, that is more clear now.

I'll check for the +5V when the ECU is powered.

Thanks for the tip!

Sam

Hi, I've done some mods on my board and I'm using the two +5V holes and the two ground holes on the proto area.

While I was doing some continuity tests to verify my modifications, I've discover that there is some continuity between +5V and ground on the proto area. Here are the results I obtained ...

OK, update on this.

After a bunch of testing some formulas, I've ended to simply try to find a nice linear curve by using 2 points and 'Generic WB Linear'. Here are the steps I used to get it done :

1- Enable the datalogging of the channel "O2 volts" in your megasquirt.ini file. This is the ...

If it works for you, this is great!

On my side, the megatune AFR gauge matches the AEM gauge correctly between 11.5 to 16 AFR, but it's off under very rich condition :

When the AEM gauge says 10.0:1 (the richest point the AEM can show), the megatune is showing 10.3:1.

As per the AEM volt vs AFR ...

Ok, I tried the Innovate 0-5V = 10-20 AFR and it's far off from the AEM gauge. I do not recommend anyone to use the Innovate 0-5V for a AEM 30-4100 gauge. It simply do not match. It's off by 0.4 AFR point in the 12.5-15.5 AFR range. I didn't try it in full rich or full lean for precaution.

Instead ...

Ok you are right about the 0-5V = 10:1 - 20:1. I'll try the Innovate setting this weekend and I'll report back.

The values I used are from the AEM instruction sheets that are available on the aem website or when you buy a AEM UEGO 30-4100 unit.

My problem for now is when the AEM gauge read 10.0 ...

Ok, I burned in the new AFR calibration (I edited the lambdasensors.ini file with the new formula above). But the results aren't what I expected. I looked at the afrtable.log file and the 0V value is always 9.72 AFR. By my formula, it should be 10.00 AFR at 0V.

I need help about this. How can I ...

HI, I have a AEM UEGO 30-4100 and I discovered that the AFR gauge in Megatune isn't showing the same AFR as the AEM gauge. The value are close, but no the same. So, I made a simple Excel spreadsheet that show the difference between the true AEM UEGO 30-4100 values and the MT values when the selected ...

So, you are saying that adding a 6800uf 25V capacitor between DB37 pin 28 (12V to MS) and DB37 pins 8-11 (ground) smoothed all the others sensors signals? How this is possible? How the voltage to MS can influence other sensors?

I have no clue about your RPM oscillation problem, but I want to know : does this datalog was taken while runing on the battery on the car or on a kind of powersupply? Because the battery voltage is really clean (14.0-14.2v). Simply want ti know!

Good luck with your problem.

Sam

Thanks for posting niner11!

Plz, post your IAT correction table values like Linzerl did. It will be helpful!

Thanks

Sam

Wow thanks a lot Linzerl!

This is what I want, exactly. I was gonna find the values with the PV=nRT formula, but I'll use yours. Thanks a lot again, it will simplify my tuning.

Lance, in my understanding of the Gair ratio, it will only make the air-fuel mixture a little richer than normal on ...

Thanks a lot lance, that's all I want to know.

Sam

bump plz

Hi, to simplify my tuning, I want to remove the Gair factor from the PW equation. To do this, I will place the Gair curve into the IAT compensation curve. This will negate the Gair effect by making the Gair value always at 100. I know some of you will tell me : Place a x ohms resistor in place of ...

Ok, thanks a lot for the reply, I'll try it as soon as I have some spare time to work on the car. I'll let you know if it fix my problem when coasting and decelerating (coasting down a little step for example).

For this datalog, I wasn't using any radiator fan, I installed a rad fan the last weekend, so, this dip in voltage drop is not related to my radiator fan.

But thanks a lot for the reply, keep them coming!

Sam

good catch, i didn't noticed it. So what can cause a battery voltage to go down that low? I didn't turn on the headlight or any other electrical components... What can it be?

Ok, I know that I have several problem with my setup as my datalog is suggesting. The setup is tuned and it's driving fine, but I'm in the fine tuning protion of the whole thing. I have located some problems that need to be fixed to have a perfect setup.

Always look at my datalog to follow the ...

bump,

please someone. I simply want to know what kind of signal is providing by the Fidle (pin#30) when the idle algorithm is set to"Solenoid", when the coolant temp is under the specified temp (Idle control/Fast idle Temperature(°F)). Is it a +12V or a ground?

Please, this is the only thing I ...