tazman

I want to get my car on a dyno to get a base line before I do anything else to it. The problem is that I can not find one around me with a wideband O2 sensor. I searched the archives and it seems the LambaBoy seems to be the most affordable. I was wondering if anybody has one of them yet that they could let me know how they like it. In an older thread some said it would work with the Tec3 for data logging. Danno do you know if this would work with the Link+? I agree with previous statement that it is not much use if you can not log it with RPM's.

Danno

Yeah, you can use the Lambda Boy with the Link+ if you get it with the simulated-EGO output option. The Link+ has a self-tune feature to populate the fuel-maps so you just hook it up and drive around for a while as it looks at O2-sensor output and that's it. We're going to be testing out a unit with a 951-specific wiring harness soon.

tazman

Cool then this should work good if I get this. I think I rmember somebody saying that you don't want to leave the wideband sensor in the car all the time because they don't last as long. Is this true? Danno do you have a LambaBoy? If so are you happy with it?


[quote] We're going to be testing out a unit with a 951-specific wiring harness soon. <hr></blockquote>
<img src="graemlins/jumper.gif" border="0" alt="[jumper]" /> <img src="graemlins/jumper.gif" border="0" alt="[jumper]" /> <img src="graemlins/jumper.gif" border="0" alt="[jumper]" /> <img src="graemlins/jumper.gif" border="0" alt="[jumper]" /> <img src="graemlins/jumper.gif" border="0" alt="[jumper]" />

cheetah chrome

in june the rtr pca chapter had a dyno day at cyntex in west chester pa. i didnt attend but reading in last months der gasser a guy by the name of paul schwars (of cyntex inc.) is a favorite tuner among the areas club racers. maybe worth a look up. <img src="graemlins/wave.gif" border="0" alt="[byebye]" />

Chris White

The Lambdaboy can be used with a Tec3 (with the optional 'rising rate' output. I am just about done adding that to my car as well as a 4 channel pyrometer.
The O2 sensor can be left in place, the ‘life span’ is predicted at about 2000 hours. Since the replacement O2 sensor is $100-120 I don’t think it is worth swapping it out, especially if you are going to integrate it with a Tec or link system.

tazman

Ok thanks for the info guys.

M758

Can you use a wideband O2 sensor combined with an Air Flow meter (MAF or MAP) to dynamiclly control fuel flow? Instead of having fuel "maps" can you just monitor intake air and exhaust A/F Ratio to in real time modulate fuel flow?

If so you would never have the need to tune or retune with future mods and you should be able to obtain and a/f you want and hold it through out the rev any throttle position range.

Just Curious
<img src="graemlins/xyxwave.gif" border="0" alt="[bigbye]" />

Danno

"Can you use a wideband O2 sensor combined with an Air Flow meter (MAF or MAP) to dynamiclly control fuel flow? Instead of having fuel "maps" can you just monitor intake air and exhaust A/F Ratio to in real time modulate fuel flow? "

The question here is: "what's your target air-fuel ratio?". The ideal ratio changes with load and RPM so instead of a fuel-map, you'll need an O2-sensor output map to compare to. This can be done with some of the aftermarket EFI using a wideband O2-sensor. Like for cruising around at partial-throttle, you can run 16-22 air-fuel ratio for fuel-economy and crisp throttle response. Then as load & RPM increases, you can dial it down to 13:1 for more power. Then at full-throttle, you can dial in 12.5:1 for the best power. However, all these settings still has to be pre-programmed somewhere.

And the stock DME can't do that at all. It already uses O2-sensor feedback, but can only use this feedback to maintain 14.7:1 ratios at partial-throttle settings. Then the O2-sensor is ignored completely under full-throttle open-loop operation.