Go to NismoTronic Software

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Air Fuel Ratio

Maintaining the proper air fuel ratio is one of the most important aspects of tuning an engine. Adjusting for optimal AFR for idle, cruise, and WOT will result in smoother engine operation and a smoother powerband. Tuning for 1 set AFR for all load cells will result in poor gas mileage.

Here is a breakdown of AFR target values by load

• Idle/Cruise - 14.7 - 15.0**
• Medium load - 14.0 - 13.5
• WOT (NA) - 12.8 - 13.2
• WOT (FI) - 11.5 - 12.0

NismoTronic incorporates a few different ways that you can aquire a wideband AFR reading in the software. One of those options is the use of a USB/Serial output from your wideband (AEM UEGO, Innovate Products, PLX SM-AFR, SLC PurePlus) and connect it to your PC. The other option is to run the 0-5 volt output wire from your wideband and connect it to one of the 4 ADC inputs on the NEMU.

Wiring your wideband into the software allows you to log your AFR along with all of your other sensor data in realtime! This means you have a direct correlation between the data you receive from the engine and the data provided by your wideband. The end result is to help make tuning easier on you!

When using a MAF sensor as your load source there are a few things that will globally affect the fueling; injector sizes, MAF LOAD FACTOR, and MAF TABLE UNIT FACTOR.

** Please note that when you adjust the MAF LOAD FACTOR, it will also shift your load scales!! **

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Ignition Timing

A properly setup ignition map will make the car much more responsive through out the powerband. Making sure your ignition timing is dialed in will ensure maximum performance from the vehicle.

The first thing you need to verify is that your engine is running at the same Ignition Value that is being displayed in the software. To verify this, you need to check the timing at the crank pulley with a timing light.

• Connect timing light to the #1 cylinder coil or plug wire
• Start Engine and let the engine warm up to operating temperature
• Enable Set Timing Mode in NismoTronic by going to the SETUP->EXTRAS->DIAGNOSTICS section and checking the SET IDLE/TIMING MODE box
• Then upload your changes by either pressing Ctrl+U or go to the Emulator item in the toolbar and select upload changes.
• Open your data screen by going to the Logging item in the toolbar and selecting "Data Screen" or press Ctrl+D
• Observe your final ignition value by locating the "Final IGN" sensor item in the data screen.
• With the timing light, verify that your indicated timing on the crank pulley matches the observed Final IGN value in NismoTronic.
• If the values do NOT match, move the Distributor or CAS until the values match
• Properly setting the timing ensures that the value that you see in the data logs is indeed the same value that the engine is running
• Disable Set Timing Mode in NismoTronic by going to the SETUP->EXTRAS->DIAGNOSTICS section and un-checking the SET IDLE/TIMING MODE box
• Then upload your changes by either pressing Ctrl+U or go to the Emulator item in the toolbar and select upload changes.

Now that your ignition values are in sync you can now move onto adjusting the timing values in the software.

ADJUSTING THE IGNITION ADVANCE CAN CAUSE SERIOUS ENGINE DAMAGE IF YOU DO NOT KNOW WHAT YOU ARE DOING!!

The best method for tuning ignition timing is on the dyno with a combination of watching how the changes you make in the software affect the engine's tq output AND checking the plugs for any signs of detonation or speckling.