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

[Brian Sidebotham]

Yep, car is NA, SFi, 

no funny fuels, just 95 RON petrol. So pretty std.

I will stick to the drop injector stratedgy, and report back results. 
I've got to get a prototype board up and running now...

Cheers, 
Brian Sidebotham.

> 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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