[Diy_efi] traction control & nitrous (devlish combo?)

[Axel Rietschin]

----- Original Message -----
From: "The McConnell's" <karlandanne at sympatico.ca>

> the point of the matter is there is very little difference
> between the road wrx and the wrc wrx.

Your point is very wrong. There is actually very little in common between
those two cars except the brand name and overall external shape. The
original Impreza bodyshell goes through 750 hours of work before it become a
WRC bodyshell, the entire powertrain and drivetrain are specific so are the
electronics and just about everything else. I think it's safer to count the
parts actually retained, unmodified, from the street car and they are the
rear lights, the windshields & side windows, the subaru logo and that's
about it, everything else is either completely replaced (like all
transmission, brakes and suspension components) or heavily modified like the
engine and the bodyshell itself, the track is vastly widened and suspension
travel is more than doubled, which require heavy modifications of the shell
itself. On the Impreza WRC the front of the car, from the base of the
windshield, is simply cut off and rebuilt from scratch. Everything is built
in such a way the individual parts or sometime entire assemblies are easily
replaceable in the field, for example it takes only about 6 to 7 minutes to
change the entire front drivetrain, including re-setting the suspension
geometry and wheel alignment, about 4 minutes to change all four shock
absorbers & spring and 16-17 minutes to swap the gearbox, if fact the car is
built in such a way that everything, save the engine and bodyshell, can be
replaced in less than the 20 mn allowed to service the car at specific
points during the rally. The electronics are very comparable to those found
in F1 cars, including very sophisticated data aquisition systems from Pi
Research (www.piresearch.com), control systems for the electro-hydraulic
gearbox and diffs (www.xtrac.com), active anti-roll bars, sophisticated
engine management including 4WD traction control, launch strategies,
anti-lag etc. As a matter of fact some World Rally Cars are using the
Marelli STEP9 ECU which is actually an F1 ECU
(www.marelli.it/racing/products.htm), others are using the Pectel T10S
(www.pectel.co.uk/products/t10s) which, alone, costs about 20K US. The XTrac
240 gearbox with its clutch and integral central and front diffs (or
team-designed derivatives) used on all current World Rally Cars costs in
excess of 120K US, a turbo costs around 20K US (like for example the TR30R).
That's a very long way from the car in the showroom next door, in fact there
is a whole industry behind those cars and they represent the ultimate in
motorsport sophistication right next to F1 and well beyond everything else.

The manufacturer's marketing trick is to make you believe your street
Impreza WRX, Focus RS or 206 GTi  is close if not similar to the works cars,
and they apparently succeeded, but nothing is further away from the thruth.

Cheers,
Axel




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