Correct A:F Ratio @ WOT?

[Jeff Meager]

Having said that, nearly all engine perform best in lean conditions,
however, this is not conducive to a long running engine.  Take my turbo
nissan.  It loves 13:1, however at this it is sitting right on its ping
threshold, as found under differing situation, and the EGT's go off the
dial.

The only real way to tune is EGT and AFR.  You want to make sure you're not
melting the engine where it "wants" to be vs where it "needs" to be.

As a basic safe rule of thumb.

WOT
Non-turbo 12.5-13.5:1

Turbo anwhere from 10.5 - 12:1.

My factory turbo cars have always run 10.5:1 out of the factory.  It tune
mine to 12:1 on big turbo engines, and small factory engines I tune to
11-11.5:1

JEff

-----Original Message-----
From: owner-diy_efi at diy-efi.org [mailto:owner-diy_efi at diy-efi.org]On
Behalf Of Bruce
Sent: Thursday, 28 September 2000 8:13 AM
To: diy_efi at diy-efi.org
Subject: Re: Correct A:F Ratio @ WOT?



You never,
ever,
tune to an AFR.
You tune for performance and note trends, or validate corrections made with
a WB.   In tuning you let the engine tell you what it wants, you never try
to force it to run where you **THINK** it should be.
A WB is just one more tool in your box, it, in and of it's self is nothing.
Bruce



----- Original Message -----
From: "Timothy J Burgess" <tjburgess at west.raytheon.com>
To: <diy_efi at diy-efi.org>
Sent: Thursday, September 27, 2001 6:36 PM
Subject: Correct A:F Ratio @ WOT?


> Now that we have the ability to determine the average A:F ratio using the
> WB O2 sensor, is there a typical A:F ratio to tune for @ WOT?
> In the TPIS catalog, they have a picture of the WB sensor & meter that
they
> sell, and there is a marker @ 12.8:1, so I'm guessing that that would be
> the value to tune for @ WOT.  Any recommended variance to that value when
> using a wet NOS system, compared to normal aspiration?
>
> Tim Burgess
>
>
> --------------------------------------------------------------------------
--
> To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the
quotes)
> in the body of a message (not the subject) to majordomo at lists.diy-efi.org
>

----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org

----------------------------------------------------------------------------
To unsubscribe from diy_efi, send "unsubscribe diy_efi" (without the quotes)
in the body of a message (not the subject) to majordomo at lists.diy-efi.org