Anti-lag devices, pros and cons?

[Ameer Antar]

This sounds interesting... Sounds terrible for street motor, but I'm not
sure how it even would work. Injectors usually sit just above the intake
valve, or sometimes further up the intake runner. So how would you get fuel
to the motor during the exhaust stroke? The intake valve would definitely
be closed and any fuel sprayed during the exh. stroke there would do
nothing in there till the intake valve opened again... So is there a
separate injector for exhaust side?? That seems odd b/c of the temps
involved. Are there special high-temp injectors, or do racers just use till
they melt?? Thanks for going through this stuff.

-ameer

At 12:10 PM 10/22/2002, you wrote:

>From: "Richard Hoffman" <billzcat1 at hotmail.com>
>To: quattro at audifans.com
>Subject: Re: Anti-lag devices, pros and cons?
>Date: Tue, 22 Oct 2002 07:45:21 -0700
>
>My impression of "anti-lag" is taken from the SDS tuning manual - basically
>additional fuel is injected into each cylinder on the exhaust stroke and the
>timing is retarded to increase exhaust temperature.  By keeping the exhaust
>hot and adding extra fuel, you get combustion during the exhaust stroke - of
>course since the valves are open at this point it does not affect the motion
>of the rotating assembly - crank, rods, pistons.  By having an increased
>volume of exhaust gas, it keeps the turbo spooled as if you simply had the
>same size turbo on a larger motor.
>Downsides: you compromise the durability of everything starting from the
>exhaust valve and out...valves, manifold, turbo, even the downpipe is at
>risk from the incredibly high EGT that results.  SDS says that is is
>basically not worth doing on a street car.  A race car, it makes perfect
>sense!
>HTH
>Richard
>1990 CQ 210K
>1970 100LS 2-dr 46K
>
>
>
>
>
>
> >From: Mihnea Cotet <c_mihnea at yahoo.com>
> >Reply-To: mik at info.fundp.ac.be
> >To: quattro at audifans.com, 200q20v at audifans.com
> >Subject: Anti-lag devices, pros and cons?
> >Date: Tue, 22 Oct 2002 06:28:34 -0700 (PDT)
> >
> >Title says it all, what are the pros and cons
> >(especially the cons) for anti-lag systems? Increased
> >turbo wear? Worse fuel economy? I saw this in an
> >article about the Peugeot 206 WRC car that puts out
> >300+ HP and 650 Nm of torque at 3550 RPM and it uses
> >an anti-lag system that seems to work pretty well, so
> >I thought "why not?"...
> >
> >Any valuable BTDT or more specific info is welcome!
> >
> >
> >Mihnea
> >
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