[Supras] richness under boost

[Jim Jobe]

Or they were talking about leaded fuel usage with the Bosch sensor.  :-)
I'm NTK all the way.

On Mon, Nov 05, 2007 at 06:33:46PM -0000, Sean Cavanaugh wrote:
> Just buy an Innovate LC-1 for 200 bucks and install it in stock O2 sensor
> location. Just having a wideband in the car helps out a LOT. My old NA supra
> ran MUCH smoother just from that (used narrowband output for ECU and
> wideband output for tuning). Whoever told you not to use wideband O2 sensors
> for long periods of times must have been referring to old obsolete
> non-heated sensors. Newer 5 wire wideband sensors are heated and have no
> issues (unless you install it in an RX-7 where the potential flamefront
> directly in the exhaust flow will melt it.)
> 
> -Sean
> 
> 
> -----Original Message-----
> From: supras-bounces at supras.com [mailto:supras-bounces at supras.com] On Behalf
> Of berniek at technicaldevelop.com
> Sent: Monday, November 05, 2007 5:51 PM
> To: Jim Jobe
> Cc: berniek at technicaldevelop.com; supras at supras.com; Walker,Brian (Rich.
> Dist)
> Subject: Re: [Supras] richness under boost
> 
> The reading has been confirmed using both a Marquete and Sun A/F thermal
> conductivity ratio meter carried in the car with a tube run to the
> exhaust.  (Yeah, I do get weird looks, like I'm trying to commit suicide
> in a contrived way).  Both types of devices indicate between 9.0 and 9.5:1
> A/F ratio.  Both thermal conductivity meters are sensitive to extremes in
> gas velocity, so standard practice is to pinch the hose just before
> getting off the gas, and then read the meter.  The problem with a
> wideband, as I'm told, is that you cannot leave it in place all of the
> time due to temperature considerations.
> 
> Bernie
> >
> > Bernie, please do not tell us you are using this gadget to determine
> > a/f ratio.
> >
> > http://www.3barracing.com/product_3.htm
> >
> > You NEED a proper wideband sensor for tuning.
> >
> > BTW, stock pistons have made 500rwhp reliably daily driven for years.
> >
> > On Mon, Nov 05, 2007 at 10:51:56AM -0500, Walker, Brian (Rich. Dist)
> > wrote:
> >>
> >> Bernie, those spikes in boost seem a bit odd to me. I have a wideband
> >> that measures press. and has peak storage. My peak boost is always ~14.5
> >> (within ~.2 psi depending on ambient temps, ball & spring controller)
> >> This is also the pressure I normally see under WOT (by autometer gauge
> >> and real time Wideband display. To me spikes of 2-3 psi seem off. Have
> >> you checked to make sure there is no play in the WG arm? Maybe that
> >> variance is normal for other folks but my peak boost has been pretty
> >> rock solid. (peak A/F on the other hand does tend to vary a little,
> >> normally 9.6:1 -10.3:1 depending on weather)
> >> Brian W
> >>
> >> Date: Sat, 03 Nov 2007 18:59:37 -0500
> >> From: "berniek at technicaldevelop.com" <berniek at technicaldevelop.com>
> >> Subject: [Supras] richness under boost
> >> To: "Supras at supras.com" <Supras at supras.com>
> >> Message-ID: <472D0B69.9090809 at technicaldevelop.com>
> >> Content-Type: text/plain; charset=ISO-8859-1; format=flowed
> >>
> >> 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
> >>
> >>
> >> _______________________________________________
> >> Supras mailing list
> >> Supras at supras.com
> >> http://supras.com/mailman/listinfo/supras_supras.com
> >
> 
> 
> 
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