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SickleCell · 10-30-2007, 12:10 AM

Can someone help me with my AFR? I'm guessing the most obvious answer is that I need a piggyback system... but I recently decided to hook my Wideband O2 sensor analog to my laptop. I did notice that my digital gauge is off by a lot. It was reading mostly from 11.3-11.9 when I had the pedal to the floor and it was reading from 12.5-12.9 at idle.

Here is a graph of a session where I was shifting first through fifth gear. I wasn't kinda lazy shifting the car to try to separate the gears as much as possible to be able to read the graph better. When I was in gear though I was flooring it, except for 1st and 2nd gear due to traction issues.

My question is, if I were running a turbo, supercharger, or spray and had this graph as my result, am I okay? Or am I running lean?

malloynx · 10-30-2007, 01:08 AM

mods???

what WB are you running...

SickleCell · 10-30-2007, 01:25 AM

I'm running the Innovate Motorsports WB.

I don't have any mods that increase fuel pressure or injection.

It's really more of a question of if this were on a turbo setup, supercharger setup, or spray setup... would this be about right, lean, or rich?

etsnet · 10-30-2007, 07:26 AM

Can't really read that cuz I don't know what I'm looking at but you should be running 11.0 -11.6 WOT (pedal to the floor). You should be running about 14s at idle. Now that's if you're turbo. That's all I can tell you.

SickleCell · 10-30-2007, 11:25 AM

thanks for the turbo setup help. How about the other two.

the left is measuring the AFR

Mr_Meaty · 10-30-2007, 06:05 PM

Seems to me you are looking at the spikes going over 20afr. Those are probably DURING shifts. When you let off the gas, your AFRs will go thorugh the roof cause there is no gas in there, which is fine, cause your not reving your engine up.

when you are accellerating, your ARs should be in the 11s (boosted) and then as soon as you let off to slow down or whatever, your AFR will go full lean untill you slow down enough, or shift to the next gear.

that chart would be more helpfull if the bottom line was RPM or throttle or something like that.

jrodTc · 10-30-2007, 06:08 PM

If i'm reading the graph correctly, it looks like 3rd and 4th gear are crazy rich while climbing thru the RPM's. It looks like it's around a 9:1 in 3rd and 4th, wow!

SickleCell · 10-30-2007, 06:16 PM

The lowest part of the downward spike is when I pushed the clutch in before the shift, the highest part is the part when I was shifting.

It seems that when I am in gear my AFR is between 11.3 and 13.8 depending on what gear I was in.

Would an emanage (or other) be something good to use on an F/I setup to keep those numbers between 11 or 12, or am I okay with this stock setup to run the way I am?

jrodTc · 10-30-2007, 06:28 PM

You'll definately want to run a piggyback fuel management system of some sort to tune your AFR's. Personally, I'd say go with the AEM F/IC over the ____ty emanage.

SickleCell · 10-30-2007, 07:52 PM

Is that the best value?

Mr_Meaty · 10-30-2007, 08:35 PM

the emanage only does WOT. If you wanna do partial throttle, you need to also purchase the pressure sensor and the harness for that. Plus, it does not come with software, which is another $100.

the AEM F/IC comes with a built in pressure sensor and the software for $100 more then the base emanage. It is on par if not better then the emanage ultimate.

SickleCell · 10-30-2007, 09:17 PM

Do they have a PnP harness yet? I know on the site it said one was being developed.... not sure if it is out yet.

How hard is it to install?