[Wbo2] Using the Bosch WB sensor with L1H1 circuit board

[Marteney, Steve]

So, it follows in Ron's original example involving 13.2 ...
13.2 - 14.7 = -1.5
-1.5 * 1.15 = -1.725 (going 15% more rich)
-1.725 + 14.7 = 12.975 (a far cry from 11.2, a much more tolerable for the recreational racer/tuner/hot rodder)

Steve M.

-----Original Message-----
From: Steve Ravet [mailto:Steve.Ravet at arm.com]
Sent: Tuesday, November 29, 2005 9:38 AM
To: Marteney, Steve; wbo2 at diy-efi.org
Subject: RE: [Wbo2] Using the Bosch WB sensor with L1H1 circuit board


 

> -----Original Message-----
> From: wbo2-bounces at diy-efi.org 
> [mailto:wbo2-bounces at diy-efi.org] On Behalf Of Marteney, Steve
> Sent: Tuesday, November 29, 2005 7:42 AM
> To: Ron Vinsant; Andrew Robertson
> Cc: wbo2 at diy-efi.org
> Subject: RE: [Wbo2] Using the Bosch WB sensor with L1H1 circuit board
> 
> I was really hoping someone would reply to this email, but no 
> one did, so I'll ask some follow-up questions.  Your 
> percentage errors are calculated directly on AFR.  One 
> example you gave is 13.2 - 15% = 11.3.  However, is the error 
> really in AFR, or is it in Lambda, current/voltage?

Garfield elaborated on this one time after I posted a similar statement.
Percentage errors are measured from stoich, not 0, since the meter has a
natural null at stoich.  To take your example of 15.1 minus 15%:

15.1-14.7=0.4

0.4-15%=.34

14.7+.34=15.04

--steve