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'''Alpha-N''' The long story in short: I bought a kit from UK called MNR Vortx to build a Lotus 7 like car. The car is a tubular frame based with plastic covers font engine and rear drive. The drivetrain are follows: the '''Duratec HE 2.0 L engine (Ford Mondeo)''', Ford Sierra type 9 gearbox, custom made propshaft and Ford Sierra diff. The engine is a pretty standards one with a little modification. Due to the rear drive the engine mount was changed from cross to along that cause a change of the oil sump. https://www.raceline.co.uk/products/part_section.asp?categoryID=1%20&SectionID=22 The engine was refurbished new rings, gasket, the head and valves were cleaned, all sensors are original Ford. The standard flywheel was changed to a lightweight one (approx. 5 kg) In order to achieve around 200 HP the only change I made was the throttle body. I used the caterham type roller throttle body http://teamterrificracing.net/TitanNorthAmerica/RollerBarrel.html, with a larger injectors 237 g/min approx. 347 cc/min 14,5 ohm. Because of the throttle body the EGR port was blanked off. The engine loom is a custom made done by Lorez garage. In Hungary the car can not be registered so I need to take it back to UK where it can be done via special IVA test. During the test the emission is one of the crucial point, the engine must pass the original emission level. CO 0.5% CO2 14.5-16.0% HC 100ppm O2 0.1-0.5% CO content at increased idle speed 0.3% Increased idle speed for CO test 2800-3100rpm Lambda 0.98-1.02 Setup are as follows: Duratec HE 2.0 l Vems V3 1. 2. 38 firmware Vems tune 1. 5. 57 Titan roller barrel with Bosch 347 cc/min Injector 14,5 ohm Adjustable fuel pressure regulator set to 3.5 bar Idle is controlled by PWM valve connected behind the throttle body Sensors are as follows: Crankshaft sensor standard Ford Camshaft sensor standard Ford TPS sensor standard Ford Water temperature sensor OEM Opel Astra Knocking sensor not in used The control is RPM vs TPS with barometric compensation. Engine is up and running with a basic configuration focus on the hot idle now. The throttle body was balanced so all four cylinders got the same amount of air. The biggest problem I’m facing with is that once the engine is at the normal temperature the idle is stable but I can not achieve the stable lambda. * '''Modifying the VE table eg from 28 to 29 unit cause abnormally large lambda value changes'''. ** NOTE: if req_fuel: 9.8=>5.8 msec then 1.69x VE values (147 => 249). ** Also check fuel calculations view, perhaps some suboptimal injector opening settings makes it hard to tune ** After the second try we realize that the ECU controls the radiator fan, and when the fan switched on the lambda moved away and returned back after couple of minutes, but still stable lambda is difficult to achive. The log mode was on so I enclose the log I gather during the setup. Any advice would be appreciated. Thanks, Peter ---- [http://vems.hu/files/MembersPage/Vortx_logfiles/ logfiles] '''Quick review''' * Basically adding an '''idle motor air feed on alpha-n without iac2llad compensation is a no-go''' * for stable idle, just disable idle air altogether, block off and adjust the main throttle slightly that should stop the hunting * Use minimal ignition based idle control ramp to keep rpm stable (warm) '''Response''' Do you mean to switch off the idle PWM valve completely? Using the valve is to have a cold start, in that kind of weather like today it wont start without additional air. Ok i'll try it. '''Response2''' I modified accordingly and now lambda changed smoothly but the idle control was much worse. Any electronic changes like radiator fan switch on or headlight switch on caused a huge swing on lambda. See log files. Finally I set it correctly and the car was sent to UK for registration. The engine was up and running till yesterday where the car can not be started. Vemtune was connected and it was clear that there is no rpm at all. it 0 during the start. The sensor was checked and it's between 430-560 ohms. Hopefully they will check at the and of the cable as well. Any help would be appreciated. The picture little bit change and we got some info that rpm works fine, tps sensor also but still no spark at all. Thanks, ---- (Budapest, 12.district), The car will be transported to UK for ID tests (2019-03-30 will be postponed, delayed brexit helps slightly)
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