Lean Mean Grocery Gettin' Machine: 2010 Nissan Versa
Posted: Mon Dec 13, 2021 10:58 pm
by mck1117
My girlfriend drives a Nissan Versa. By that, I mean that I take apart her Versa for fun.
It has a 1.8 liter MR18DE. Double overhead cam, single (intake) VVT, electronic throttle. It has a CVT - so some CAN integration will be required to be able to drive it.
And yesterday, I started the car on rusEFI!
Todo list:
O2 sensor
Trigger configuration (currently running on cam-only, no crank)
VVT!
CAN data to keep the cluster and TCU happy
MAF calibration
Re: Lean Mean Grocery Gettin' Machine: 2010 Nissan Versa
Posted: Mon Dec 13, 2021 11:03 pm
by mck1117
Injectors characterized! Connected a battery charger to hold the car at 14 volts, locked the fuel pump on, and fired pulses of different duration using rusEFI. Crunched some numbers, and ended up with 323 cc/min.
(grumble grumble, you have to remove the whole intake manifold to get the injectors out)
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Re: Lean Mean Grocery Gettin' Machine: 2010 Nissan Versa
(grumble grumble, you have to remove the whole intake manifold to get the injectors out)
why note eBay similar injectors?
Re: Lean Mean Grocery Gettin' Machine: 2010 Nissan Versa
Posted: Mon Dec 13, 2021 11:13 pm
by mck1117
Next question: wideband o2 sensor. These cars (and lots of other Japanese cars of the era) have a weird wideband sensor that's sort of like a narrowband, but with different control system behaves as a wideband. Not as good as a Bosch LSU4.9, but still very usable, and without losing any accuracy over a traditional narrowband sensor.
I've attached some papers about this type of sensor.
Here's the key part:
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Apply about 0.4 volts, then measure the current source/sink of the sensor. Current flowing out of sensor, rich. Current flowing in to sensor, lean. Conveniently, the current is linear with respect to phi (reciprocal of lambda), with a different slope on either side of stoichiometric.
Apply voltage, measure current: Hey, that's something I can do with a lab power supply and a multimeter:
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(I know the lab supply shows 0.5 volt, but that's because the internal display is slightly out of cal, it's outputting almost exactly 0.4 volt)
This shows 17uA of current, which corresponds to a very slightly lean mixture.
Re: Lean Mean Grocery Gettin' Machine: 2010 Nissan Versa
(grumble grumble, you have to remove the whole intake manifold to get the injectors out)
why note eBay similar injectors?
Well, I have these injectors already connected to a nice Nissan-brand injector test bench (plus Coke bottle and small scale), and (unfortunately) I do not have all of eBay in my garage
Re: Lean Mean Grocery Gettin' Machine: 2010 Nissan Versa
Posted: Tue Jun 28, 2022 5:31 am
by AndreyB
Please post tune and log
Re: Lean Mean Grocery Gettin' Machine: 2010 Nissan Versa
Posted: Tue Jun 28, 2022 5:34 am
by mck1117
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