Air/Fuel Gauge

[SHO-Z]

I didn't know until today how simple it is to hook up a gauge like this or there even was one. This will make tuning my project allot easier.

 

 

http://www.jetlink.net/~okayfine/su/airfuel.html

[Guest bastaad525]

only problem is that 99% of people who are into cars like we here are into cars will agree that a/f ratio gauges like this one, that take their reading from regular one or three wire, narrow band O2 sensors, are nigh-on useless for truly and safely tuning a turbo setup...

 

If you really want to know what's going on you need a wideband O2 setup like one of these: http://www.zeitronix.com/Products/zt2/zt2.htm

[Clifton]

For finding and tunning for stoich you can just measure the voltage (.0-1v) off the stock 02 sensor. You don't need a $100 flashy voltage guage. Anything other than that I wouldn't trust a narrow band.

[Guest bastaad525]

but even for that they suck... a stock L28ET doesnt' like to idle at stoich... in my experience and that of others, these motors like to idle rich.

 

When I was tuning at the dyno, even at idle it ran about 12:1 AFR... I tried tuning it by tweaking the AFM, and also by tweaking the fuel pressure lower, and either way, any leaner than about 12.5:1 or so and the idle would start to roughen up pretty quickly, by 13:1 it was struggling, misfiring bad... I didn't go any leaner than that.

 

I know at least one other person here had a very similiar experience.

 

I dunno if they like to cruise at stoich but I know mine runs rich all the time and runs pretty smooth.