Getting facts straight! (3/3)

[Bruce Plecan]

----- Original Message -----
From: Tom Parker <parkert at ihug.co.nz>
To: Greg Hermann <diy_efi at efi332.eng.ohio-state.edu>
Sent: Tuesday, December 07, 1999 5:26 AM
Subject: Re: Getting facts straight! (3/3)

I'll bet ya the primary driver for the cost is the warranty recovery rate.
When the manufacturuer is picking up the tab, lots of ifs no longer matter.
Switchin voltage does vary by fuel type, that I got from a fellow that does
oem calibrations,  also, shows why there is an option to change it in some
calibrations, (ie allows for the very high alky content), in like Brazil.
Grumpy


| Greg Hermann <bearbvd at cmn.net> wrote:
|
| >So--what are we left with that is magical about stoich? The facts that a
| >stoich mixture is the point where a three way catalyst works best for
| >cleaning up tailpipe emissions and that it is also the point where a
| >standard EGO or HEGO exhaust oxygen sensor (as opposed to a UEGO WBO2
| >sensor) switches its output. Period.
|
| So do the EGO sensors work at stoich because they were designed to work at
| this ratio, or is there something intrinsic about their operation and the
| conditions at stoich that causes this?
|
| I guess the OEM's wouldn't be using them if they didn't work at stoich, so
it
| doesn't really matter if it is easy to make them this way or not. A better
| question would be are they cheaper than the wide band sensors because they
are
| easy to make, or because they are used on so many cars?
|
| --
| Tom Parker - parkert at ihug.co.nz
|            - http://www.geocities.com/MotorCity/Track/8381/
|