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Programmable ECU on 20V
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<blockquote data-quote="Useless" data-source="post: 1283698" data-attributes="member: 670"><p>fandango,</p><p></p><p>haha. I thought u disappeared. Please wait awhile for me to pm u. i saved the msg somewhere. need to look for it.</p><p></p><p>btw, what ecu are u running? do u have some specs?</p><p></p><p>i think the minimum one should go for is 16 square resolution. from my experience, for daily driving with the ocassional spirited driving, meddling with the mid range would give the most feel. coupled with playing the cams, optimizing the power band to one's driving style is highly achievable. you would be surprised to see that eventhough having more than 16 square resolution, it will have somewhat similar regions with the 16 square changed values. then there is also the interpolation resolution which exist between surrounding cells. but that would be to technical and dwelling into firmware development. lets not get there. </p><p></p><p>as again, piggyback capabilities always fall back on the embedded values within the fuel maps on the ecu. e.g. i did try running ultra lean on my car (4g91) with safc and itc before. no error code. was practically pushing to the limit of lean fueling and high ignition timing from low to mid range. surprised that there was no error code or check engine light. fuel consumption was better (obviously) but the risk of running lean did crack the coolant rubber stopper, small problem. other than that, no knock at normal city driving conditions. i dont know how far the toyota ones can be pushed with a piggyback before it switches itself to run on a different map. hence, my conclusion is that the my mitsu ecu is "flexibly dumb".</p><p></p><p>best way is to always rechip the fuel map or to re-flash the fuel map. but i havent seen it being done on small cc cars. too expensive for low level enthusiasts.</p><p></p><p>maybe the cheapest way to make instant changes to the fuel map is to add a variable resistor to the absolute pressure sensor. old-skool style. haha. but i dont know how many 80s-90s genre ecu will react to that. changing altitude pressure readings can alter fueling.</p><p></p><p>cheers</p></blockquote><p></p>
[QUOTE="Useless, post: 1283698, member: 670"] fandango, haha. I thought u disappeared. Please wait awhile for me to pm u. i saved the msg somewhere. need to look for it. btw, what ecu are u running? do u have some specs? i think the minimum one should go for is 16 square resolution. from my experience, for daily driving with the ocassional spirited driving, meddling with the mid range would give the most feel. coupled with playing the cams, optimizing the power band to one's driving style is highly achievable. you would be surprised to see that eventhough having more than 16 square resolution, it will have somewhat similar regions with the 16 square changed values. then there is also the interpolation resolution which exist between surrounding cells. but that would be to technical and dwelling into firmware development. lets not get there. as again, piggyback capabilities always fall back on the embedded values within the fuel maps on the ecu. e.g. i did try running ultra lean on my car (4g91) with safc and itc before. no error code. was practically pushing to the limit of lean fueling and high ignition timing from low to mid range. surprised that there was no error code or check engine light. fuel consumption was better (obviously) but the risk of running lean did crack the coolant rubber stopper, small problem. other than that, no knock at normal city driving conditions. i dont know how far the toyota ones can be pushed with a piggyback before it switches itself to run on a different map. hence, my conclusion is that the my mitsu ecu is "flexibly dumb". best way is to always rechip the fuel map or to re-flash the fuel map. but i havent seen it being done on small cc cars. too expensive for low level enthusiasts. maybe the cheapest way to make instant changes to the fuel map is to add a variable resistor to the absolute pressure sensor. old-skool style. haha. but i dont know how many 80s-90s genre ecu will react to that. changing altitude pressure readings can alter fueling. cheers [/QUOTE]
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