That is going to be a CHALLENGING!
I use (along with several other gearhead-efi members) the information from TunerPro RT data logs to optimize TBI engine performance. Using a Wide Band O2 Sensor (WBO2) will provide the best possible TBI engine performance, see attached screen shots. The WBO2 will show where the engine is running lean and where the engine is running rich to achieve the best possible GAS MILEAGE and ENGINE PERFORMANCE!
In my many years of TBI tuning experience, an off the shelf " TBI chip" will not provide optimized TBI engine performance.
Maybe the option of installing TunerPro RT (http://www.tunerpro.net/downloadApp.htm) into a Laptop along with an ALDL Cable (http://www.aldlcable.com/products/aldlobd1u.asp) is a plan worth pursuing to optimize your SBC 400 TBI Performance? (no chip burning equipment needed) A "Tuner" will have the chip burning equipment. A "Tuner" will use the TunerPro RT data logs to correct the "Chip" for Rich / Lean fuel mixtures.
I've always wondered:
What if that TBI Chip company used TunerPro RT to help their customers?
What if the customers of that TBI Chip company were willing to use TunerPro RT?
dave w
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