Hi mi16chris, I haven't looked at your files but it is just a known, that when air temps rise the air is less dense and you require less fuel. You state you have no IAT sensor, then you can not apply any heat soak or reverse cold air corrections to your tune. You said cruising your tune was good, but then you left the engine running at your friends house without driving air flow, the latent heat build up in the engine bay and components would go through the roof. So with heat soaked inlet manifolds etc the air is less dense but your ecu is still applying the same amount of fuel, hence for the rich mixtures. Now if you look at it from the opposite perspective in winter the air is cooler and more dense. This means you will require more fuel and you will find your AFR will trend LEAN. Your call but I advise fitting a TPS sensor so you can employ throttle enrichment settings, for smooth responsive acceleration, also the ability to use TPS input settings to activate Auxillaries etc. I also obviously strongly recommend the fitment of an IAT also. Your choice what you decide to do as it is your car, but the precision of your ECU will never function at it's true potential without setting it up properly. Regards Dave.
Hi, I've had a look at your log file. I can see how the lambda reading is leaner as the log goes on. When I check the Fuel Table 1 reading at the same points it is even. To me this indicates that either the ECU is applying a trim of some sort (which I do not see in the log file), or something like temperature is effecting the tune. We do highly recommend running an IAT sensor. Can you also please supply your base-map? Scott
