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Summary of change:
13-11-2013 VEMS 1.2.18 install to standard Volvo 960 B230FT with camsync (sequential) and Crane HI6 CD ignition. Original Volvo 60-2 VR flywheel sensor Volvo 740 Hall distributor on camshaft for camsync AW71 auto gearbox. Running firmware 1.2.17 for 1 month, and now 1.2.18 ------------- Try to improve fuel economy, which is lousy (8,1 km/l mixed) with original ECU. With VEMS, now running 9,5 km/l mixed driving, but still tuning it. ---- '''EGR : exhaust gas recirculation''' Many factory engines recirculate a small amount of somewhat cooled exhaust gases into the intake at part load (cruise). * might help a bit with emissions * increases MAP somewhat, and decreases "pumping losses" (==drawing in air through a significant pressure drop across the almost closed throttle) and therefore slightly improves fuel economy Does this engine have EGR valve ? (looks like an oversized IAC valve). * if yes, is it PWM or stepper type ? (how many pins, what resistance ?) ** Do you plan to use it ? ** relying on EGO correction only (less fuel despite the higher MAP), or also some anytrim ? ** if you find that under some static cruise (perhaps in a temporary setup) the injector pulsewidth can be reduced significantly (eg from 4 msec to 3.6 msec) by some EGR-valve setting, than it might worth to apply some fw-mod for that strategy (in some ways similar to the tank-evaporator-canister purge valve, which is also enabled at certain part-load situations, enabled gradually, and dumps to the intake manifold). ---- Thanks for the EGR tip. Have not thought about that. My engine has no EGR, but a 2 wire PWM valve operating at 100Hz (Volvo 940 standard freq). I have no plans for a EGR valve, (have not seen any 940 in DK with EGR) but right now I am experimenting with hot air inlet at cruise speeds to try improve economy. At cruise I bypass the intercooler letting hot air (35-45 degrees) into the intake. I don't know if this will improve economy, only time will tell. ---- 20-11-2013 Help needed Engine cannot start when -2 degrees. Engine gets more and more difficult to start the lower the temperature. VEMS takes 8-12 sec to send IGN pulses out to Crane HI6 when +8 degrees outside. VEMS will not send IGN pulses out to Crane HI6 when -2 degrees outside. When or if the engine gets started, other start attemps the engine fires up after 4-6 sec. When warm no problems starting. I can see the IGN pulses from the VEMS on Crane HI6 LED indicator. Battery is 65 Amp/h and new. The problem is that VEMS do NOT send IGN pulses out when cranking in cold wheather. Look at the logfiles. If you mark between 2 missing tooth VemsTune says 59-61 tooth count, but if you count them manually there is 58 tooths. The logfiles are from cranking today at -2 degrees. Triggerlog1 http://www.vems.hu/files/PerVolvo/crank%20at%20-2%20dg%20outside-1.triggerlog Triggerlog2 http://www.vems.hu/files/PerVolvo/crank%20at%20-2%20dg%20outside-2.triggerlog vemscfg http://www.vems.hu/files/PerVolvo/camsync%205.vemscfg If I disable camsync, still no starting. The wierd thing is if I disconnect the camsync sensor and disables camsync the engine starts. After that I can reconnect the sensor and reenable camsync and the engine starts. But tomorrow when it is cold same problem I guess. It seems to me that the camsync sensor can disturb the crank trigger signal In this triggerlog with engine idle, VemsTune reports 58 and 59 tooth count, but when I manually count them there are 58 tooth counts. http://www.vems.hu/files/PerVolvo/trig%2058-59.triggerlog ----
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