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Poor Man's ECU Fuel Enrichment

In message <9712301641.AA11317@aztek-eng.com> DeWitt Harrison writes:

> On Tue, 30 Dec 1997 06:45:29 +0000, Douglas Quebbeman wrote:
> >[ ... ]
> >Has anyone considered using the cold-start valve for WOT fuel
> >enrichment? It seems like it would be pretty simple to do. The
> >cold start valve delivers fuel at a fixed rate, and it's not metered
> >by the fuel distributor, of course. [ ... ]
> "Not metered" is the key phase.  This sort of full throttle
> enrichment is, at best, a very crude way to avoid detonation
> in "poorly" executed turbo designs. With this arrangement,
> the mixture can only be correct at a single value of air
> flow or WOT rpm.

You're assuming that it isn't done under ECU control.

 Phil Payne
 Committee Member, UK Audi [ur-]quattro Owners Club