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Lupo spitting flames


reececrabb
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I come across a video on YouTube last night of a 1.0l Lupo spitting flames and was wondering how the **** that was possible in a one litre car and the thing was popping and banging like mad was wondering if it was just a tune with a decat or something I’m missing out on 

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You can do it with any petrol car, just rag the tits off it, turn it off and then back on again quickly after, the fuel being dumped into the engine at full revs ignites when the engine is turned back on and it fires it through the exhaust system. It helps to have a straight through though. 

And to be a bit retarded.

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10 hours ago, Pete said:

You can do it with any petrol car, just rag the tits off it, turn it off and then back on again quickly after, the fuel being dumped into the engine at full revs ignites when the engine is turned back on and it fires it through the exhaust system. It helps to have a straight through though. 

And to be a bit retarded.

You can't if the car is a modern fuel injected thing, controlled by a bosch ECU, with a cat. As a safety measure, the moment the ECU is switched off, all the injectors (and carbon canister purge solenoid) and fuel pump are shut off. If raw fuel went into a cat it just gets converted. Pete's right though- if you had a straight though exhaust and a software modded ECU you could program it to inject fuel without any ignition pulses. No flames though, just a big bang.

To get visible flames (yellow), you need to run a mix of about 4:1 air:fuel. But you need to ignite it first, and 4:1 wont ignite with a spark plug. It's actually much more difficult than you think. A flame thrower concept might be easier........ (huge injector in the tailpipe). :) not that I know anything about this!

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