[Supras] richness under boost

[t72pwrd]

That deserves an old time BWAHAHAHAHAH and not one of those damned LOLs.


----- Original Message ----- 
From: "Jim Jobe" <jjobe2 at supratech.org>
To: <berniek at technicaldevelop.com>
Cc: <supras at supras.com>; "Walker, Brian (Rich. Dist)" 
<brian.walker2 at vdot.virginia.gov>
Sent: Monday, November 05, 2007 1:03 PM
Subject: Re: [Supras] richness under boost


>
> Where did you hear that?  I run my FJO wideband 100% of the time.  It's 
> approx
> where the stock sensor would be but a little further back.  I use it with 
> my AEM
> EMS to run 16-17:1 at cruise.  :-)  You cannot beat it at all.  Make sure 
> whatever
> wideband you get has datalogging capabilities, log map and rpm, and stop 
> trying
> to drive, tune, pinch one off, and watch a bunch of guages at the same 
> time.
>
> sorry could resist.  ;)
>
> On Mon, Nov 05, 2007 at 12:50:31PM -0500, berniek at technicaldevelop.com 
> wrote:
>> 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
>> >
>>
>
> _______________________________________________
> Supras mailing list
> Supras at supras.com
> http://supras.com/mailman/listinfo/supras_supras.com