[Supras] LEX-stock AFM comparison

[t72pwrd]

The stock AFM/ECU combo is overly rich from the factory.


----- Original Message ----- 
From: <berniek at technicaldevelop.com>
To: <Supras at supras.com>
Sent: Saturday, October 07, 2006 6:37 PM
Subject: [Supras] LEX-stock AFM comparison


> Hi list.
>
>    Just doing a little more work to get my '90T back on the road.
>
>    I've read about the Lexus AFM-550cc injector upgrade, which I intend to 
> do.  But there is one perplexing question:  Since the Karman Vortex effect 
> is linear with respect to volume air flow, why does the Lex-550 
> combination run too rich under boost?  The stock ECU appears to 
> extrapolate from stoichiometric under normal conditions when you put your 
> foot to the floor.  So the percentage increase in fuel should be the same, 
> once the ECU "learns" the fuel trim from the O2 sensor, from either the 
> stock setup or the Lex-550 combination.
>
>    What am I missing here?
>
>    Thanks.
>
>        BernieK
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