Who wouldn't use a 5-wire O2 Sensor?

[Shannen Durphey]

Drag engines?  Nope.  I live fairly close to "Nascar's most dangerous track." 

There's still some roundy car tracks in the area.  The Busch north series runs
here, lotsa smaller classes of racing, too.  It's too bad that some of the
smaller modified tracks are shutting down, but I guess America prefers racing on
their TV and Wally World close to home.

It's funny, but when I talk to the guys that work the pits, they don't do nuttin
during a race "on the track" 'cept fix the car.  And there's still a bunch of
guys that use plug reading during the test sessions.  "gauges fail, but the
plugs _always_ tell the truth."  --So I'm told.

I've met drivers that never see the tach.  Ask 'em what the engine was doing,
they say "I dunno."  Yeah, telemetry or recording devices is the only way to get
any information from sensors.

Point is?  I've only met a few guys (and they're young ones) that are regularly
using additional instrumentation on the cars.  Plenty have tried it, and some
hook the sensors up "fairly often," but it still seems to be about using your
senses more than anything.  

I guess mabe the old stereotypes are still true?  The guys on the left coast
love to run high tech, and the guys on the right coast just love to run.

Shannen


Garfield Willis wrote:
> 
> On 11 Apr 2002 16:54:56 EDT, Shannen at grolen.com wrote:
> 
> >That's kinda funny, as major racing engine builders in this area don't
> >even use an O2 sensor.  They measure air/fuel ratio on the  intake side
> >of the engine.
> 
> You talking mostly about drag car engine builders?
> 
> That's fine on the dyno, and the old reliable way to do it before AFR sensing
> came into vogue, specially when you're dealing with carbs that don't have
> recirculating fuel to subtract on the return side from the delivery side
> measurement (and almost the same as the return side flow). Not as accurate in
> recirculating EFI systems; subtracting two big numbers from each other to find
> the much smaller difference is called a "common-mode rejection ratio" problem in
> instrumentation. Requires much higher resolution/dynamic range flow measurement
> to get the same accuracy than with returnless.
> 
> But measuring the mass flows for air and inNout fuel at the intake is pretty
> problematic doing that on the track. I don't know of anyone that does that on
> the track, do you? Plus especially on carb'd cars you also wouldn't see any
> mixture imbalances caused in the turns.
> 
> Many teams have long since gone to a sensor per runner, and during tuning on the
> track, telemeter all that stuff back to the pit, along with a ton of other data
> including suspension positioning, etc. etc.
> 
> I recall Frank Parker telling me about how the factory C5 Corvette team would
> buy NTK blue boxes in lots of 8 and strap them together! As in $8k+. Ouch.
> 
> Gar
> 
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