[Supras] richness under boost

[joe at wilmcd.com]

Are your EGT readings too high? I don't think you're going to have a
problem with temperature at 11:1... even that's pretty rich under boost. 
I don't know what a Dawes A/F indicator is. That's a true wideband sensor
I assume? Stock pistons are fine at 15psi.

Are you asking what to use for fuel control? I used a S-AFC for a few
years successfully. I now have a MAFT-Pro and although I have yet to drive
the car on the road with it, it runs very well and I don't have to deal
with the Lexus AFM and a S-AFC or similar.


-Joe Rushlow



> Today, I temporarily wired up a Dawes A/F indicator, and found that as
> expected, the engine runs richer under boost than needed for best
> power.  There are ways I will be considering to lower combustion
> temperatures, such as water injection (already have the RV water pump).
> But for now, the Dawes readout always has the blue LED lit under boost,
> I guess the way Toyota intended it (about 9:1 A/F ratio).  The car feels
> good, so I'd rather be safe than sorry, but can use any number of means
> to get the A/F up to about 11:1 under boost.  I'm particularly concerned
> about safety since I'm running the stock pistions at 15 PSI, with one
> second long spikes up to 17-18 PSI.  Has 550cc, Lex, 3" exhaust, 57 trim
> turbo, Walbro and the usual mods which go along with these parts.
>
>
> As always, any information would be appreciated.
>
>
> Berniek
>
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