Quote:
Originally Posted by TMS
OK how about this for outside the box thinking? So go easy on the thought process. I can't connect all the dots in my mind but if you are NOT running E-85, maybe you could leverage the E85 tables in the ECU. Since we are talking about fuel and timing control for failsafe perhaps you could install an Ethanol sensor and wire it into the ECU. Then you use the gauge failsafe trigger as a means to send the right voltage signal to the E-85 sensor to make the car think it's running a different Stoich based on the sensor read. Basically instead of adding timing and fuel you pull timing and fuel on the E-85 side of the equation in the appropriate tables.
Just thinking out loud.
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You may be able to do something similar to this with the IAT signal. When IAT signal was lost on older gm cars it would read like it was at the lowest temperature possible. So in that part of the iat spark adder table you could make it command like 5* of advance only. It will be part of the table that the actual iat readings would only ever actually go if it was like -30* outside so it will more than likely never hit that temp in real world use. Only when the fail safe grounds it out or cuts the signal going to the pcm thus causing the pcm to go to the minimum reading on the table.
I know guys have used it with aftermarket 2 step systems. When they hit the button it sent ground to the 2step tp tell it to work and grounded the IAT circuit i do believe as well to make it got to the lowest part of the table where they would retard the timing a bunch to help build boost on the trans brake while the 2step was active. When they would let go of the button the IAT would return back to normal operation and timing