how much boost can stock CIS handle?

[Orin Eman]

> >An AFR gauge attached to the O2 sensor will only read from
> >'definitely lean' to 'maybe OK'... unless you get one of
> >the really expensive wide range sensors and meters... which
> >would cost way more than say IA's box.  I think even the
> >meter (unofficially) using Honda's wide range sensor
> >is (will be actually) over $400.  (Search the archives
> >on diy-efi.org for 'EGOR'.)
> 
> actually the one I have by autometer is pretty nice. It uses 20 led's 
> instead of others which use 8 or so, and msd's which only has 2! So 
> resolution is pretty fine. I can even see on the afr gauge when the ecu is 
> adjusting the mixture w/ the freq. valve when the led's start cycling. The 

I make them myself out of LM3914s...
20 LEDs doesn't tell you anything more than 10.

> range of the gauge is dependent on the o2 sensor, not the gauge, b/c the 
> gauge reads from 0-1V which is the max output range of the sensor. So it's 
> not like the gauge is cutting off the extreme lean or rich values. The only 

It is.  The O2 sensor works in a very narrow range.

> The main point though is if the engine was running anywhere out of range of 
> the stock o2 sensor, running would be extremely rough, there could be 
> detonation, and emissions would be through the roof. I don't see the need 

Not true at all.  WOT or under boost, the system goes open loop,
well out of the range of the standard O2 sensor.  Maybe Mr Mockry has
put his exhaust gas analyzer on an 10V... I recall the 20V
runs around 12:1 air/fuel under boost, well out of the range of
the stock O2 sensor.

Orin.