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'''Why too rich? ''' The secret is probably found if I look into the calc model ---- '''My stock BMW''' I upgraded my summer daily driver from 1.1.70 to 1.1.91 the other day, now that 1.1.91 had been released for a week. I began by first warming up the car and seeing if it ran as it should after winter storage and it showed no sign of problems. I upgraded to 1.1.91 and started the engine, it ran rough and I immediately adjusted req fuel as I suspected it ran rich by the sound of it. To my surprise I had to lower it to 8-9 ms down from the previous 16.3 that was used with 1.1.70. Looking for my mistake I warmed up the engine properly after that and downgraded to 1.1.70 and restored the old configuration file, sure enough it ran like clockwork again with req fuel of 16.3 ms. I can't find where I went wrong, can you help me? Short engine specification : * Stock BMW M20B20, 2.0 litre 6 cyl, 2 valve/cyl * 133 cc/min injectors Req fuel = 6.49*(2000/6/133) = 16.3 * Wasted spark coilpack (originally distributor but has 60-2 trigger) '''Log files''' * Upgraded to 1.1.91 [http://www.vems.hu/files/MembersPage/MattiasSandgren/BadUpgrade/m20-1.1.91-at-idle.vemslog Idle with 1.1.91] * After downgrading to 1.1.70 to check [http://www.vems.hu/files/MembersPage/MattiasSandgren/BadUpgrade/m20-1.1.70-at-idle.vemslog Idle with 1.1.70] ---- '''The V8''' I got rushed into a short job on a V8 which didn't start too well due to bad injector and cranking settings with large injectors, 1680 cc/min on 6.2 litre engine with gasoline = bad. I fixed that and tuned it with the the firmware that was in the ECU at the time which was 1.1.81, after I was nearly done I upgraded to 1.1.91 and started the engine. I did some trimming at low rpm in the VE map and thought nothing of it, with these injectors it's not easy to get a perfect tune but when some load was put on the engine it ran rich. Log files: * [http://www.vems.hu/files/MembersPage/MattiasSandgren/BadUpgrade/v8-1.1.81.vemslog Log from tuning with 1.1.81] * [http://www.vems.hu/files/MembersPage/MattiasSandgren/BadUpgrade/v8-1.1.91.vemslog After upgrade to 1.1.91] This is why I'm confused, the VE maps look like this with the firmwares with reasonable tuning on 0.6 bar boost : http://www.vems.hu/files/MembersPage/MattiasSandgren/BadUpgrade/v8-1.1.81-to-1.1.91-ve.png It's obvious I had to remove a lot of VE to get the tune right. Here's why, but I'm not sure it explains why I had to halve the req-fuel on the BMW : http://www.vems.hu/files/MembersPage/MattiasSandgren/BadUpgrade/v8-1.1.81-to-1.1.91-calc.png
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