I have ordered a 20-300kpa sensor, hopefully it idles (and then drives!) much better. pulse width = 3.6, ign advance = 2degĬonclusion: The ecu does not like this map sensor which is a 50-400kpa sensor. The 4Bar map sensor reads 44kPa at approx. pulse width = 3.0 - 3.3, ign advance = 7-10deg. The stock map sensor reads 32kPa at approx. I was able to compare a lot of figures (stock vs 4bar map) at idle for coolant and intake temps which were very close. I re-did all the maps which were kPa based and it still ran like a pig. The flex fuel sensor makes things easier because you don’t have to load an E85 specific map into your ECU when you switch fuels. The Haltech flex fuel sensor is very robust and helps the Elite 2500 make the choice to switch between fuel maps based on the fuel youre using. Stock Map: 840 - 1.0 - 32 - 8deg - 3.33 - 58degCĤBar bosch: 880 - 0.35 - 46 - 0deg - 3.84 - 50degC If youre running E85 a flex fuel sensor is a must-have item. This comprehensive tuning software allows you to fully tune and adjust a stock ECM. I tried to do these as close as possible to eachother so the engine didn't warm up too much and make the comparison a bit off: Cheers!ĮDIT: Here are some before and after figures of the stock vs 4bar. bias table and try again, but am still interested in other peoples results. So I'm guessing that this may have had a hand in the rough running. the VE figure in the 100kpa column of the bias table was now sitting in the 180kpa column, for that particular rpm. The Bias table columns had changed to match the VE table (40kpa up to 180kpa), but the actual table figures had not moved accordingly. THEN I realised that I didn't adjust he atmospheric bias table (and also any spark tables). If I jabbed the throttle it would almost stall afterwards and the revs would bounce around a lot. It started and the revs bounced a lot, when I levelled out it idled ok but I highly doubt the car was driveable. Installed the sensor and started the car from cold. Then I adjusted my VE table to still match the stock table from 20 to 100kpa (though the number of columns has greatly reduced). I just tried my bosch 4 bar map sensor and adjusted the VE table so the columns start at 40kpa (bit higher than the stock 20kpa but this is the minimum figure that map sensor reads), up to 180kpa as I wont be boosting my car above that! For those who have installed gm 2, 3 or any other MAP sensors, have you had to adjust your "Atmospheric Pressure Bias" table?
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