No, not in a meaningful way. Inputs are fixed to what the ecu does with it. No extra or empty ports have been found.
You can us the ac pressure sensor to input an analog 5v reading if you just want it logged, but can't change what the ecu does with that input.
Iirc this is a reason fathouse swaps the ecu for a motec on their builds. No failsafes with boost on the stock ECU, no extra sensor add ins etc.
Unless he is running a build that needs more than the 105-110 octane you get from e85 he will make more power with e85. at 30% oxygen by weight the only thing that makes more power at that octane level is methanol at 50% oxygen by weight.I hear that Grimreaper. My brother has a 1998 supercharged/nitrous Cobra that was built by Sean Hyland Motorsports. Car has 9,998 miles on the odometer (7500 of which are on the built motor). He hasn’t tagged the thing since 2009, but when he was driving it, he was spending $250 in fuel to drive it Fri.-Sun. each week. He has to run 110 octane in it. I told him to convert to E85 for a cheaper fuel bill and achieve the same results.