April 28, 200321 yr Author comment_35382 Ahhhh great Enrique! Thanks heaps, now I will remember all about it due to the Bus story ROFL Link to comment https://www.classiczcars.com/forums/topic/5847-what-is-backfiring/?&page=2#findComment-35382 Share on other sites More sharing options...
April 28, 200321 yr comment_35384 Something that's NOT recommended (but can be a good laugh), which only works on engines that don't have an idle cutoff solenoid;While coasting down a hill in gear, turn the ignition off. This allows the exhaust to cool quite rapidly, a few pumps of the throttle (ie accelerator pump shots) & turning the ignition back on can blow the exhaust system clean off the car. I've seen these 'key-bangers' performed with great skill on the 12A rotary engine, resulting in a huge ball of flame exiting the exhaust (straight-thru mufflers help).As a rule, poor tuning, bad engine condition & low owner care-factor are required to perform this 'stunts'.Alfadog, you car has no throttle damper (which prevents the throttle snapping closed - the 260Z's had these in Aus.) and no cutoff solenoid. You can expect a little popping from the exhaust (not much) and not be concerned.An EFI car with the TPS mal-adjusted will exhibit the same symptoms, as the fuel-shutoff is not happening on closed throttle.Years ago, I had a problem where my Haltech EFI system was causing the car to stall after closed-throttle coasting. It turns out that the software that I had for it had the decel cutoff high-rpm value, but no low-rpm value. Therefore, the car would not inject fuel once the throttle was closed, unless it was opened again. This also meant that the car would stall when free-revving.Damn that was a frustrating problem.... Link to comment https://www.classiczcars.com/forums/topic/5847-what-is-backfiring/?&page=2#findComment-35384 Share on other sites More sharing options...
April 28, 200321 yr comment_35385 Originally posted by Ben While coasting down a hill in gear, turn the ignition off. This allows the exhaust to cool quite rapidly, a few pumps of the throttle (ie accelerator pump shots) & turning the ignition back on can blow the exhaust system clean off the car. I've seen these 'key-bangers' performed with great skill on the 12A rotary engine, resulting in a huge ball of flame exiting the exhaust (straight-thru mufflers help). That sounds like a hell-of-a-lot-of-fun! I propose we chip in $50 each and buy a run down car to practise this 'key-banger' method.Anyone?:cheeky: Link to comment https://www.classiczcars.com/forums/topic/5847-what-is-backfiring/?&page=2#findComment-35385 Share on other sites More sharing options...
April 28, 200321 yr comment_35386 I can vouch for the key-banger method as one of my mates used to do it regularly to scare the rice-boys in South Yarra. It was really funnny for first few months - until he blew red-hot baffles out of his exhaust one night. If you do it "well" enough it really is like a small explosion (coz it is...duh!!:stupid: ) Link to comment https://www.classiczcars.com/forums/topic/5847-what-is-backfiring/?&page=2#findComment-35386 Share on other sites More sharing options...
April 28, 200321 yr Author comment_35387 I'm in for that, George! Actually friends and I do have plans for sjit box racing in a paddock with some $200 cars one day... i'll be sure to post pictures if we ever get around to it Link to comment https://www.classiczcars.com/forums/topic/5847-what-is-backfiring/?&page=2#findComment-35387 Share on other sites More sharing options...
April 28, 200321 yr comment_35393 Definately post pics. You can hold your own smash em derby. Don't know how well the authoroties will take that but if it's on a paddock then it'll most likely be private property so......have fun:classic: Link to comment https://www.classiczcars.com/forums/topic/5847-what-is-backfiring/?&page=2#findComment-35393 Share on other sites More sharing options...
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