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Old 01-15-2003, 02:42 AM   #1
aspera
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Default anyone heard of an anti-lag system that injects air into the exhaust?

I was reading a British car magazine at the book store. There was a Celica GT4 homologation car that had this hidden feature. Ever heard of it?

[expecting John Felstead to answer first]
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Old 01-15-2003, 04:59 AM   #2
aspera
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All I can find out is that newer WRC cars use some kind of ALS+EGR. This EGR must be different from emissions EGR.

I also read that some Mistubishis inject fuel into the turbo!??
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Old 01-15-2003, 05:56 AM   #3
aspera
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Default BINGO!

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Old 01-16-2003, 02:44 AM   #4
Subayai WRX
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Default

Use of the old "air-pumps", or air-injection was common on mid sixties and later cars to get the unburnt air-fuel mixture that leaves the combustion chamber to burn completely. Actually I should say that it was required on all California cars to pass California's tougher emissions regulations. The down side of this system was the slight HP drain from another accessory driven belt pump, and premature exhaust valve wear due the allowing the combustion process to occur on escaping exhaust gases.

My old '66 Mustang was just one victim of the air-injection systems. First thing most people did was plug the holes in the manifold (leaving the lines running to them), and then removing all the vanes from the rotary air pump.

From the description given in the link I would suspect that they are simply re-directing the pressurized air, rather than to atmosphere (like most of the factory BOV's do), and re-directing it to the exhaust inlet stream of the turbo compressor to keep the air flow up, hence the impellor RPM's. But this is only my speculation.
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Old 01-17-2003, 02:45 PM   #5
aspera
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Default detour around the engine to create a jet engine

...so compressed air from the turbo basically "goes around" the engine, and straight into the exhaust. This air is supplied from the BOV when the throttle plate is closed.

That seems like a good way to use otherwise wasted air.

The more modern Anti Lag System that I've read about uses the ECU to retard timing and add fuel. I've also read about a "kicker" that keeps the engine above 4000RPMs or so.

It seems like there are many versions of ALS. I wish somebody would explain them, but they're probably racers' secrets.
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