anyone have experience with a Greddy "wide band" O2 gauge?
 

I have one on my FD and everything seems good, alittle too good:) Just cruising around I get an A/F ratio of exactly 14.7:confused: When I go WOT it'll change a bit and drop to 12, sometimes bury itself into 7. Just wondering if you guys know if it's normal for a car to run 14.7 while cruising. Does it have something to do with open loop and closed loop? I just figured it's way too accurate. Thought maybe my gauge was messed up or something.

doesnt the greddy use a 0-1v sensor?

The greddy it not a wideband, and in my exp. you are much better buying a real wideband as I find it hard to get anything repeatable out of it, and it also seems to react slowly at time.

I have the Greddy unit and it is only "near wideband".

It definitely seems biased toward staying at stoich- I don't know if that is either in the O2 sensor tolerance itself or in the programming in the little sensor box.

I have noticed that the unit is very sensitive to heat in the stock location (though less so w/ a wide open exhaust) so if you have varying EGTs you will NOT have repeatable readings.

I bet this unit would benifit from being much further down the downpipe (like true wideband O2 sensors)since it is heated and this would even out the EGTs it is exposed to.

Lastly, Greddy acknowledges that the unit is sensitive to position due to EGTs and they have an adjustment pot on the sensor box so you can adjust it to match a true wideband.


Currently w/ the rash of affordable true widebands I think the Greddy unit is totally outclassed- though the analogue display is my favorite feature. The position of the needle can be noted in you peripheral vision- nothing like squinting at a digital display tuning the top end of 5th gear.

I saw one of the popular mags had a test of wideband units. The best was the non consumer available unit, then the VERY expensive MOTEC unit being "just as good" followed by ONE OF THE CHEAPER units being a close 3rd best!