[Diy_efi] RE: [Diy-efi] Traction Control System - In progress (Update 1)

[Bruce]

The fuel cut should be fine.
GM as well as probably many others uses a DFCO (Deccleration Fuel Cut Off)
strategy.   I run it on my car (DFCO), and no problems have been noted.
Just remember thou, you're going to be adding alot in the way of shock loads
when you turn this power cut on and off.   So in a real light fast
acclerating car, as it cycles back on it might instantly spin the tires (or
fool the sensors into thinking they have been), and the unit might
oscillate.
Bruce



----- Original Message -----
From: "Brian Sidebotham" <BRIAN at lightprocessor.co.uk>
To: <Diy_efi at diy-efi.org>
Sent: Monday, April 22, 2002 4:23 AM
Subject: Re: [Diy_efi] RE: [Diy-efi] Traction Control System - In progress
(Update 1)


> > Rodney Fulk wrote:
> > >
> > > > Personnaly, I will not be including the main ECU in the Traction
> > > > Control system. I am unsure wich signals you'd modify to 'fool' the
> > > > ECU into reducing engine power. I will simply defeat injectors
> > > > directly. I may use the output of the crank sensor or something to
> > > > define the timing required to defeat each injector.
> > > Ouch! Your better off turning off the ignition system...
> > > Running in a lean condition can blow your engine pretty seriously.
> >
> > Doesn't cutting injections stand a good chance of making the mixture so
> > learn it won't even ignite and thus not be that big problem?
> >
> > does the car have cat ? AFAIK cutting ignition and putting large amounts
> > of unburnt fuel into a red hot cat is a very bad idea,
>
> The car has no CAT, and I was banking on there being virtually no
> fuel in the cylinder to (a) burn, or (b) chuck into the exhaust.
> Therefore I assumed everything would be safe. It would sound a bit
> poppy, but nothing else.
>
> Does anyone think there will be enough vapour left around to ignite,
> meaning a really lean mixture? I was going to leave the spark, but
> cut the fuel by not firing the injector. I could maybe cut the spark
> too, but it makes the system pretty complex then.
>
> > >
> > > Why not just tie into the VSS and send a speed to the PCM/ECM that is
higher
> > > then the speed limitor will allow.
> > > This should do the same thing the way it was intended by the factory.
And
> > > should be pretty simple...
> > >
> > > VSS data is well known and easy to obtain. It should also be easy to
emulate
> > > with the number of the emulators out there to allow
> > > hot rods to use drivetrains that were never intended for them.
>
> Good idea. I'll have a look, but I don't think the ECU is speed
> resitricted. I'll check to see if I can find any data on it. The system
> is a Bosch motronic 2.5
>
> Thanks, Brian Sidebotham.
>
>
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