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The old v3 was very non-standard. Originally low voltage flyback. ~10 Ohm injectors so the replacement ECU has 30V flyback which is better. '''But you need to increase VE table especially at low kPA to get appr +500 usec longer pulsewidth'''. Without tuning the VE table the engine can be lean, undrivable, and misfire. The USB-RS232 can indicate misfire by disconnecting. '''solution: Increase fuel pulsewidth''' You can get an idea of the direction of required changes: * in the VE-table we increased the lowest-kPa row by +32, than gradually only +24, +16, +8, +4, +2... import VE table by saving [http://www.vems.hu/files/MembersPage/SalyiBmw/v3.3_n000816-A-2013.07.17-16.37.27_modified_higherVE.vemscfg this vemscfg] to disk and dragging over the VemsTune VE table (VE tuning) ** this is just very approximate, to show the direction of changes, the engine must be fine-tuned for proper lambda 0.96 .. 1.00 at low load (that's why the wideband lambda sensor is installed) * and in "Engine setup" dialog increase req_fuel slightly (eg from 3.0 to 3.1 msec) Alternatively, in injector settings "injector opening" can be increased (eg. from 208 to 720 usec). See tutorial videos under [http://vems.hu/vt/ vems.hu/vt].
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