Traction Control

[Dave Zug]

FWIW:

The chevy venture we bought has traction control - it limits throttle
travel, and backs it off when you step too hard on the gas. I dont even
thing it has wheel sensors - its open loop and assumes based on calculations
when the tires are slipping.  I never really looked at it but it was only a
$150 option and definetly uses throttle limiter.

I had tried pulling spark to zero at 255 MAP and 1200-1500 rpm in the grand
prix to take the "thought" out of a drag launch. worked but needed fine
tuning. as for closed loop traction control - outta my area of interest.

----- Original Message -----
From: Bruce Plecan <nacelp at bright.net>
To: <gmecm at diy-efi.org>
Sent: Saturday, September 23, 2000 6:28 PM
Subject: Re: Traction Control


>
>
> > I'm considering some firmware techniques to reduce power for winter
> driving.  Maybe retarding >spark a little or missing an ignition pulse.
Is
> anyone doing this kind of stuff?
>
> I spent a ton of time on such a deal.
> Looked for sudden rpm changes.
> Used Tack input to charge two caps thru two resistors,  feed that to the
> high and low ends of a 3914.
> The various output levels were where I would drop cylinders as prime
number
> to min loading up one particular cylinder,  ie 1st step would drop 1 in 7
> cylindr firings, then 1 in 5, then 1in 3.  Rain snow would never get to
> stage 3.  at 1 in 5 the engine was noticeably missing, and couldn't be
made
> to spin a tire.
>    BTW, tried the MSD multistep and was crazy trying to get enough retard
to
> make a reall difference instantly.  The 1 in 7  is like a 20% power cut.
>
> If you have abs then just allow for like 8-12ish percent slippage rear to
> front and run the logic gates for the cut outs, would be what I'd do
> Bruce
>
>
> > This will be my first winter in the Z,  and I'm a little concerned about
> getting stuck in the snow.
> > Bill
> > Len Sabatine wrote:
> > > It's easier and less expensive to change the torque converter;
> > > The production torque converter in F car A4 is very "tight stall "  2x
> > > torque multiplier. which is no help in slick operating conditions,
> > >      We normally replace it with a custom built unit , which also
> removes
> > > approx 15 lbs off the back of the crank . The
> > > combination , combined with appropriate tires ,greatly improves
control
> and
> > > traction. ( Worth .3 - .5 off 1/4 mile ticket too )
>
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