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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 by one unit cause abnormally large lambda value changes. 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 |