[Land-speed] EFI AFR Question..

[Jonathan Amo]

Problems with the innovate system is that it have a variance of +-.5 in 
lambda and that is considered NORMAL OPERATING for the sensor. There are 
other systems that offer a .1 accuracy, but usually the price goes up for a 
better labratory grade sensor. So if you are commanding 11.4 and your 
getting 11.5 fine, if you are trying to tune to a .1 variance, I say give up 
now with the system you are using.. That is close enough that the .1 you are 
going thru is probably not attainable with the measuring device you are 
using and will probably not effect performance of the machine in that 
tolerance range.

Jon

----- Original Message ----- 
From: "drmayf" <drmayf at mayfco.com>
To: <ddahlgren at snet.net>
Cc: "'LSR'" <land-speed at autox.team.net>
Sent: Thursday, October 11, 2007 11:12 PM
Subject: Re: [Land-speed] EFI AFR Question..


> Well, it's dark out now, so I won't go look, lol. The one I have is
> Innovate LC-1 system. Is that good or just average or poor.  Iguess the
> question I was asking was what's good enough. If I command 11.5 and get
> 11.4 how much time do I spend trying to determine if it is sensor, or
> real live afr? What's the cost benefit analysis gonna say? I could spend
> a zillion bucks tracking down something that is in reality in the noise.
> What do the rest of you folks who tune with a wide band do? How close is
> close enough?
>
> Oh, Dave, how much for the Accel DFI 77030-3 system for a mustang? I
> need tostart saving my milk money..
>
> mayf
> ddahlgren at snet.net wrote:
>
>>Count the number of wires on the sensor there might be either 3 4 5 or 6
>>.. 5 or six can do better than 0.1 3 can not and 4 might if it is a
>>bosch '002' sensor. It is also a factor of how far the maps are from the
>>target value.
>>Dave
>>
>>-----Original Message-----
>>From: land-speed-bounces+ddahlgren=snet.net at autox.team.net
>>[mailto:land-speed-bounces+ddahlgren=snet.net at autox.team.net] On Behalf
>>Of drmayf
>>Sent: Thursday, October 11, 2007 7:15 PM
>>To: LSR
>>Subject: [Land-speed] EFI AFR Question..
>>
>>
>>Taking a moment or two and just browsing data. Since I am still learning
>>
>>about EFI, can I ask a question? Ok here it is. If my brain box commands
>>
>>a specific AFR number and then computes the injector pulse width to
>>meter the fuel to meet that AFR, and then my wide band tells me what the
>>
>>actual AFR comes out to be, just how close should it be to be considered
>>
>>to be good and accurate? Like if I tell it 11.5 and it comes back 11.2
>>or 11.8 or something. Just how far off can it be and still be
>>acceptable.  1 decimal place? 2? 3? Does any of that make sense?
>>
>>just curious and as I said still learning..
>>
>>mayf