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Old 30 Apr 2007, 08:29 (Ref:1903164)   #1
mrsweety
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mrsweety should be qualifying in the top 10 on the grid
A1GP explosions?

Out of interest! what is causes the explosions when they back off the power into a corner?

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Old 30 Apr 2007, 08:34 (Ref:1903167)   #2
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Suze should be qualifying in the top 3 on the gridSuze should be qualifying in the top 3 on the gridSuze should be qualifying in the top 3 on the grid
I don't know the exact engineering proper answer however I do love that noise
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Old 30 Apr 2007, 09:13 (Ref:1903192)   #3
mrsweety
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sorry I meant

*Out of interest! what is the cause of those explosions when they back off the power into a corner?*

Yer they sound great :-) and I must know the engineering reason :-). I'd say the cars are up there with F1 for sound, but then again last time I heard F1 my ears were ringing for 4 months.... and now have ear damage in right ear... but that's prob down to racing also.
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Old 30 Apr 2007, 11:25 (Ref:1903268)   #4
Bryan Degerlund
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Bryan Degerlund should be qualifying in the top 10 on the grid
Added to by the impromptu post-qualifying firework display by the guys in orange (no, not the marshals -- the Dutch supporters).
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Old 30 Apr 2007, 11:28 (Ref:1903269)   #5
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Engine advance. When you lift off unburnt fuel still enters the cylinders and the pop and crackle is the fuel burning off. Its the same thing that you see from GTs and other cars when they back off and flames come out of the exhausts.
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Old 30 Apr 2007, 11:29 (Ref:1903271)   #6
mrsweety
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Originally Posted by Peter Mallett
Engine advance. When you lift off unburnt fuel still enters the cylinders and the pop and crackle is the fuel burning off. Its the same thing that you see from GTs and other cars when they back off and flames come out of the exhausts.
Thanks, thought as much! but it's much much louder, why is that?
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Old 30 Apr 2007, 11:31 (Ref:1903272)   #7
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No noise limits on FIA cars.
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Old 30 Apr 2007, 11:48 (Ref:1903277)   #8
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Is that the real reason :-) - UK and noise issues eh.........

Not being an engine builder, what is the advantage of running advance?
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Old 30 Apr 2007, 12:02 (Ref:1903285)   #9
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Better speak to an engine builder I haven't a clue.
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Old 30 Apr 2007, 13:43 (Ref:1903369)   #10
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Hepatic should be qualifying in the top 10 on the gridHepatic should be qualifying in the top 10 on the grid
it's not done for any advantage, they just wanted the cars to look and sound exciting for the spectators, and they have done a fabulous job with it! Incidentally, you don't see any flame like GT cars (check out the Chamberlain Porsche for a good example) because the exhaust outlets are buried deep in the engine, in front of the gearbox unlike most cars.
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Old 30 Apr 2007, 13:49 (Ref:1903375)   #11
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I realise you don't see the flames.

But you wouldn't get any of that noise unless the engines were running advanced and that is done to increase power, not for aural or visual effect. How advancing an engine works on the power curve I don't know.
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Old 30 Apr 2007, 14:11 (Ref:1903392)   #12
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It's not done for noise! LOL it's done for power and I'm interested in why.

There were flames but they were just on the inside of the pipes.

Sounded great tho and love to drive one.
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Old 30 Apr 2007, 14:45 (Ref:1903426)   #13
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Spudgun should be qualifying in the top 3 on the gridSpudgun should be qualifying in the top 3 on the gridSpudgun should be qualifying in the top 3 on the grid
I know WRCs do it as a result of anti-lag to keep the turbo speed up, but as far as NA goes I'm just guessing.

Something to do with throttle response coupled to how rich a thoroughbred racing engine of that type runs maybe?
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Old 30 Apr 2007, 16:26 (Ref:1903489)   #14
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It's not done for noise! LOL it's done for power and I'm interested in why.
I beg to differ. The engine is not developing power as the throttle is closed and the engine is on overrun. It's done for noise as per the Sheik's original (non-engineering) specification for look and sound.
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Old 30 Apr 2007, 16:49 (Ref:1903508)   #15
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Frankly the Sheik can say what he likes but all racing engines do it to a greater or lessr extent because of fuel flow and ignition advance.

However unless you want to blow up an engine, there is no way you would purposely make it happen. In other words it is the natural result of the correct level of tuning. This also involves the exhausts which must be tuned to suit the car's performance.

Sorry was that blasphemous?
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