Anti-lag devices, pros and cons?

[Jim Green]

--- Mihnea Cotet <c_mihnea at yahoo.com> wrote:
> 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!

I don't have BTDT, but from what I've read, they just
aren't for street cars.  What happens is the ign ECU
retards timing to something like 50 -60 datdc, and
opens an aux air valve to keep the rpms up.  When you
retard the timing like that the mixture is still
expanding when the exhaust valve opens, so naturally
the turbo is going to spin like crazy.  This also
really heats up your exhaust, and unless you have a
system ready to handle egts +1800 F  you're asking for
trouble.  Now you may be able to implement something a
little more mild, but that's how the race cars work.
Infact my Haltech has this function, maybe some day
I'll play with it to see how far you can go in a
street app.

Later,

=====
Jim Green
'89 90tq 034EFI, Haltech IG5
http://www.geocities.com/jeg1976/car_home.html

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