Jim* Posted July 8, 2013 Posted July 8, 2013 Okay so my friend has a mk2 focus rs with just cat back exhaust and when hes gives it the boot then changed gear it pop's and bang's like this: is there any reason why our little cars dont do this? is it somthing that can be mapped in? Quote
AdamB Posted July 8, 2013 Posted July 8, 2013 Its just because its essentially on the overun, every car will do that if its running rich. Quote
Taggy Posted July 8, 2013 Posted July 8, 2013 its because the engine is tiny in a starlet, 1.3, the RS is a 2.5 litre turbo which is more or less twice the size. This means hell of a lot more fuel/air so you are much more likely to get unburnt fuel etc in the exhaust which is ignited, causing the overrun popping. Quote
Jim* Posted July 8, 2013 Author Posted July 8, 2013 ahh I see, so what about the corsa vxr as that is only a 1.6 turbo, and they also do the same Quote
Azz Posted July 8, 2013 Posted July 8, 2013 Our cars do do it with a good enough turbo setup ! Socks has a video somewhere think on YouTube of pops and flames going through the gears Quote
TrisK Posted July 8, 2013 Posted July 8, 2013 The RSs boost spike like fuck and the Ecu chucks in a load of fuel to compensate.So if you change right you can make some massive pops Quote
Weyro Posted July 8, 2013 Posted July 8, 2013 1. Remove O2 Sensor2. Replace with Spark Plug3. Wire to coilpack4. ???????5. Profit Quote
Flaminsam Posted July 8, 2013 Posted July 8, 2013 I was told popping on overrun is due to the exhaust having a leak or a poor seal. Air from around the area that is blowing is sucked in causing the lambda to read oxygen in the exhaust so the ecu adds extra fuel the try and burn off the oxygen. Also if it is running rich there should be little or no oxygen in the exhaust to create combustion. Quote
mech5107 Posted July 8, 2013 Posted July 8, 2013 Our cars, when coasting on no throttle, completely cut injection pulses so it is more economical.Not sure. how you can achieve the banging noise...If you have a decay exhaust then it can happen but mainly when you get on throttle after coasting down. Quote
Jim* Posted July 8, 2013 Author Posted July 8, 2013 The RSs boost spike like fuck and the Ecu chucks in a load of fuel to compensate.So if you change right you can make some massive popsI wonder why ford didn't just fix the boost spike over making the ecu chuck in more fuel Quote
TrisK Posted July 9, 2013 Posted July 9, 2013 Watch the boost guage next time you are in itIt will spike just before the pop Quote
Jim* Posted July 10, 2013 Author Posted July 10, 2013 Watch the boost guage next time you are in itIt will spike just before the popwill do mate Quote
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