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

[Tom Sharpe]

Cut the NOx first.!.!.!   
Power reducers in reverse order of effectiveness:
spark retard.
drop individual cyl - spark or fuel (assuming sequential). 
drop multiple cyl.
drop NOx. 
Probably a bad idea to drop fuel in batch fire, TBI, or NOx applications. 

Tom
On Mon, 22 Apr 2002 23:03:26 -0400, "Rodney Fulk" <rfulk at mindspring.com> 
wrote :

> Just NEVER do this in a NO2 car.
> You are correct, GM used fuel cut offs for most of the over speed limit or
> over rev limits.
> 
> I was thinking of NO2 systems. I am sorry. ;)
> With No2 you stand a very strong chance of blowing the engine cutting the
> fuel.
> Alot of the aftermarket ignitions allow you to use an ignition cut for 
over
> reving.
> Much more compatible with NO2 systems.
> 
> > -----Original Message-----
> > From: diy_efi-admin at diy-efi.org [mailto:diy_efi-admin at diy-efi.org]On
> > Behalf Of Bruce
> > Sent: Monday, 22 April 1996 10:48 a.m.
> > To: Diy_efi at diy-efi.org
> > Subject: Re: [Diy_efi] RE: [Diy-efi] Traction Control System - In
> > progress (Update 1)
> >
> >
> >
> > 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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> >
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