[Diy_efi] Making a fake O2

[David Cooley]

Ah, so your experience is a global observation on everything...
You must be a legend in your own mind! 

> -----Original Message-----
> From: diy_efi-bounces at diy-efi.org 
> [mailto:diy_efi-bounces at diy-efi.org] On Behalf Of Adam Wade
> Sent: Sunday, May 29, 2005 10:11 PM
> To: diy_efi at diy-efi.org
> Subject: RE: [Diy_efi] Making a fake O2
> 
> --- David Cooley <n5xmt at bellsouth.net> wrote:
> 
> > If your injectors are starting to have reduced flow due to 
> deposits, 
> > low fuel pressure etc, the stock maps are NOT going to be safe.
> 
> Most Honda factory turbo motorcycles have never had their 
> injectors cleaned, and many are operating with fairly clogged 
> fuel filters.  I've never seen nor heard of any engine 
> problem on ANY Honda turbo, for ANY reason.  They run 
> open-loop, and have been in service since 1982.
> 
> If turbocharged motorcycle engines can handle it, I daresay 
> normally-aspirated applications will be quite safe when 
> operated in open-loop without BLM, unless the maps themselves 
> are pretty horrible.
> 
> > The O2 sensor is there to correct for changes in 
> airflow/fuel flow etc 
> > in the engine to keep the A/F where the manufacturer specified...
> 
> No, the O2 sensor is to command a stoichiometric mixture 
> during low-load steady-state operation.  One of the added 
> benefits that has come with that is the
> (limited) ability for a manufacturer to partially compensate 
> for age via the use of BLM tables.  Prior to the emissions 
> requirements that demanded a three-way catalyst and long-life 
> emissions components, there were no oxygen sensors used in 
> fuel injection. 
> And if it was really that advantageous, then every 
> fuel-injected motorcycle made in the past 10 years would have 
> an O2 sensor.  You'll note that most of them don't, and the 
> ones that do only did so when the EMISSIONS requirements were 
> raised to the point where closed-loop running with a catalyst 
> was necessary.
> 
> > If you take a vehicle that isn't brand new, and run it in open loop 
> > with no corrections, then yes, the open loop maps MAY cause damage.
> 
> So all us motorcycle riders who got injected bikes without O2 
> sensors can sue the manufacturer for making self-destructing 
> engines?  Cool!
> 
> Frankly, since both open- and closed-loop running depend on 
> the same ingition tables, any fuel maps that would "damage" 
> an engine when it was older would also be very likely to 
> damage it when new.  Further, think about where best-power 
> fuel mixture is, in terms of potential engine damage...
> 
> Somehow, I am certain that those creating the fuel maps for 
> automotive OEs are not neary as horribly stupid as you're 
> saying they are.
> 
> | 82 Honda CX500 Turbo (Cassandra)  90 Kwak Zephyr 550 (Daphne) | "It 
> | was like an emergency ward after a great catastrophe; it  |
> |   didn't matter what race or class the victims belonged to.   |
> |  They were all given the same miracle drug, which was coffee. |
> |   The catastrophe in this case, of course, was that the sun   |
> |     had come up again."                    -Kurt Vonnegut     |
> | M/C Fuel Inj. Hndbk. @ Amazon.com -  http://tinyurl.com/6o3ze |
> 
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