puma

iTrader: (2)

what would be a good A/F ratio guage? i know autometer doesn't worth a thing but how about Halmeter or what else?

thanks

puma

7-sins

I was looking at the autometer, I haven't hurd anything really bad about it. I know the greddy is suppost to be the most accurate though.

the_saint

Your A/F gauge is limited by our o2 sensors. To truly make use of an A/F gauge you need a wideband o2 sensor, and a way to monitor is (ie gauge that is calibrate for it).

Mike

puma

iTrader: (2)

ok any suggestion on which to get?

Styk33

I recommend the MRM unit. People on here have been happy with the FJO DIY setup. Never seen the display or how it works, so I cannot comment on that. The MRM unit gives you a realtime graph that is easier to use than just a number.

http://www.mrm-racing.a.se/English/MRM_lambda.htm

the_saint

I (and a friend) are going to be building our own wideband 02 sensors (off the diy efi website) we have the sensors and the boards are on order. The total parts list at less than $300, and it should work. There are many people using it with great success.

I will keep you guys posted.

Mike

Magnificent 7

Very true. The Greddy has its own dedicated 4-wire O2 sensor, and can be calibratred with a wide band to be accurate. The other thing I liked about the Greddy unit is that it has analog (needle and numbers) readout instead of a cheesy looking LED jumping all over the place.

the_saint

Any 4 wire o2 sensor doesnt mean it is as good as a true wide band o2 sensor. But it will only be accurate over a very narrow air:fuel ratio range.

I wouldnt tune my car without a wideband sensor, on a dyno, or on the street. Too expensive to rebuild.

Mike

Magnificent 7

Again, very true and I agree. I did not mean to imply that an A/F gauge is a substitute for a wide-band O2 sensor, it's not. In fact they are two different pieces of equipment. I wouldn't tune my engine with my Greddy gauge either. In fact the Greddy manual states that the gauge shouldn't be used to tune the car. Hell, A/F gauges aren't even accurate at less than wide-open-throttle anyway, but that IS where you need the information.

I only brought up the fact that it has its own dedicated 4-wire sensor to empahsize the fact that it does NOT use the factory O2 sensor that sends signals to the ECU. You have to drill a hole in the DP and weld in a threaded collar to mount it. So it is a completely independent unit from the stock unit. This gives you the capability of checking one against the other (well it does if you have a method of monitoring the other such as a Power FC).

The only device suitable for tuning IS A WIDE-BAND O2. Using a wide-band sensor you can calibrate the Greddy; the Greddy has the capability of being calibrated (not all the A/F gauges on the market have this capability). And since the guy's looking for a gauge I would recommend the Greddy. Unfortunately I don't know of a wide-band O2 sensor that's available in gauge form. If that's what you're building, then I would be very interested in discussing it with you.

Good Luck