Traction control

[Bruce Plecan]

-----Original Message-----
From: Chris Conlon <synchris at ricochet.net>
To: 'diy_efi at esl.eng.ohio-state.edu' <diy_efi at esl.eng.ohio-state.edu>
Date: Thursday, November 12, 1998 1:35 PM
Subject: Re: Traction control


>Christian Hack wrote:
>
>> I am currently looking into a DIY TC system myself and someone
>> mailed me and suggested a fly-by-wire system with a variable
>> resistor on the pedal and say a fast enough stepper motor on
>> the actual throttle. This would obviously make it real easy
>> to shut the throttle. Would a stepper motor be fast enough
>> do you think?

I do beleive the new vettes are throttle-by-wire
Bruce
>
>I had heard that the traction control on the NSX worked, in
>part, via the ECU having the ability to close the throttle
>plate somewhat. (They didn't say if it was 100% fly by wire,
>if there was a second restrictor butterfly just for the ECU,
>or if the ECU could "offset" the butterfly angle set by the
>driver's foot.) Any more info on this type of fly by wire
>system (in actual practice) would be greatly appreciated. I
>can see needing this sort of thing down the road.
>
>> Someone suggest dropping cylinders by stopping the injectors.
>> Could there still be a small amount of fuel from previous cycles
>> which would result in a very very lean mixture or is that
>> unlikely to cause a problem?
>
>Well, there probably will be some fuel left over, but if you
>were running at 12.5:1 before you hit fuel cut, and fuel only
>gets down to 25% of normal, that's still 50:1 afr. Even if it
>did ignite, and somehow detonate, the total energy released
>is roughly 1/4th of normal. In practice it'd be way less, and
>not enough to ignite or damage anything if it did. This is my
>opinion anyway. (FWIW I hit fuel cut almost daily, under boost.
>No problems yet.)
>
>   Chris C.
>