Tuning and logging Questions.

[tyhoppy]

Ok, i found this item "LM-1: Digital Air/Fuel Ratio Meter"

Tuning an engine for maximum power previously required long trial-and-error sessions on a dynamometer. With the LM-1, precise AFR measurement allows the user to correctly adjust many variables- including carburetor jetting, fuel injection, turbo fuel curves, etc.- without long and expensive dyno sessions. The meter’s digital signal processing technology provides data on exactly how rich or lean an engine is running at any load. The LM-1’s self-calibrating circuitry also compensates for changes in temperature, altitude, and sensor condition.

The instrument can sample and store the air-fuel-ratio and the other sensor data internally in operation for later analysis on a personal computer. At a sampling rate of 12 samples/second the instrument can store up to 44 minutes worth of data in non-volatile memory. The data can be downloaded to a personal computer using a standard serial port and viewed/analyzed by the included software or any standard spreadsheet program.

The standard LM-1 includes a Bosch wide-band oxygen sensor and cable, cigarette-lighter adapter, serial cable for PC connection, 9V battery, exhaust bung and plug, CD and manual. The LM-1 ships with a Bosch sensor, however, it can also function with other wide-band sensors, including Honda/NTK and VW sensors.

Available accessories include auxiliary input cables, alligator-clip power cable, exhaust clamp, analog output cable, and Aux. input expander. Additional accessories include a dash-mountable display and AC adapter.

The LM-1 sells for $349.99, including the oxygen sensor (Bosch LSU4.2), 10' sensor cable, 10' power cable, serial PC cable, analog output cable, and software..



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Is this better then the Slow Boy Racing "SCAN-MASTER 3" ?

Will this automaticall make adjustments to my fuel trim to keep my af ratio at the best setting? im not sure what tuning equipment i should use, i want something that i won't have to constantly monitor. any suggestions, and information on how these things work. and what would be easiest for me? Thanks.

 

[DGajre777]

i want something that i won't have to constantly monitor. any suggestions, and information on how these things work. and what would be easiest for me? Thanks.

If you don't want to constantly monitor, get the "MAFT Gen II" (do a search of it, if you have never heard of it), a GM MAF and a LC 1 wideband. You can then set the MAFT Gen II for a desired Air/fuel ratio like 11:1 and the unit will increase or decrease fuel to keep it at that ratio.

EDIT: You will also need a logger for your timing curve to look for knock.

 

[tyhoppy]

what is the perfect air fuel ratio?

 

[tonymitss5]

The perfect AF ratio is different for every single car, and it will change in your DSM from day to day based on the weather, humidity, etc.

 

[tyhoppy]

so how do you know what to tune it to. and how does your computer know what to change it to in it's stock form?

 

[bjmauck]

On N/A cars the perfect A/F is 14.7 to 1 under boost you want around 11.5 to 1