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Discussion Starter · #1 ·
Many new with either the TwEECer R/T or Quarterhorse should pay close attention to how it works to dial in the MAF, This step is crucial for proper fueling at given range after injector data has been applied as needed through out to dial in corrective data. If you have any questions please let me know, this will help many learning the fundamentals of tuning the MAF before further adjustments.

Thanks, Chris

(Mike G. Of STKR aka TwEECer Systems)

Suggested Method:

An overview of the process for developing a reliable MAF Transfer, using the TwEECer RT logging feature.

Using KAMRFx (Long Term Fuel Trim(s) LTFT) and/or Wideband sensor data, to correct the MAF flow values in the "normal" closed loop rpm range.

If you prefer to use the wideband sensor data only, you can disable closed loop (method varies depending on your EEC) and adjust the Y values (usually Kg/hr) at each MAF voltage where the AFR is more than 0.5-1 away from 14.7.

KAM Reset

KAM (Keep Alive Memory) is where the EEC stores Long Term fuel trims and other Adaptive strategy factors relating to fuel and idle corrections during normal driving operation. This procedure should be done before each logging session, when changes to the MAF data has been made.

- Disconnect Battery Ground cable
- Turn on ignition key, head light switch and press brake pedal for 30 seconds
- Turn off ignition key, head light switch and release brake pedal. Does not matter which order you do these steps.
- Re-connect Battery Ground cable

Make absolutely sure the timing is set at the stock value of 10 deg initial. Verify that the fuel pressure is set to the stock value of 39psi. This is checked with the vacuum removed from the regulator, but both must be plugged/blocked off while checking the setting.

Build a payload as specified below and log from a cold start to operating temp (approximately 160degF) at idle. After the vehicle reaches operating temp, use the throttle to raise the RPM to the below approximate levels for 60 seconds each.

1000 RPM @ 60secs
1500 RPM @ 60secs
2000 RPM @ 60secs
2500 RPM @ 60secs

Release the throttle and let the RPM's drop on their own and stabilize. If the vehicle wants to stall, let it idle on its own until it stalls and then restart. Spend the next 10 to 20 minutes driving in normal traffic. This will build the fuel trims or wideband data in the rpm range for closed loop operation.

Preferred MAF Transfer Tuning Payload Registers

Inj PW1
MAF Volts
Throttle status
Battery Voltage
Load %
Spark Advance
AFR/Boost ***

*** If you have a Wideband controller and/or Boost sensor, please include this data in the datalogs using the appropriate method for your EEC/Wideband combo.

Note: All data is supplied by STKR,LLC (TwEECer Systems)
*All Rights Reserved 2011 Copyright*
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