What is "backfiring"?

[Alfadog]

Ahhhh great Enrique! Thanks heaps, now I will remember all about it due to the Bus story ROFL

[Ben]

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....

[That Ozzy Guy]

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:

[Gee]

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: )

[Alfadog]

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

[That Ozzy Guy]

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: