stock 2012 5.0 manual

[46Tbird]

I would definately suggest either getting a tune or checking with the factory. All the other 5.0's we have dynoed in the past run between 12.5-12.0 from the factory. Yours is definately on the lean side.

And I didn't want to get a tune because it will void the warranty.

Note the block in the middle... and where it leads. lol

[Blackpony]

I've heard something like at least .5 afr points if reading through the cats, but that is all dependent on the cats and exhaust setup, could be even more. So at the very least you are 14.5:1 but could be somewhere in the 13's. I hate that they read through the cats like that.

How would you suggest we get a better reading before the cats? We definately need to send out a mass email to every shop in existence to let them know they are doing it wrong...

FYI the dotted red line is 13:1, his car was reading 14.5-15.0:1 so even if .5 variance that still puts him at 14.0...

I would definately suggest either getting a tune or checking with the factory. All the other 5.0's we have dynoed in the past run between 12.5-12.0 from the factory. Yours is definately on the lean side.

[grabberblue_11]

You think they are going to drill a new bung in every car at a dyno day???


I wouldn't get on it until it's checked out for sure. Expensive motor to blow up.

This has been a common issue on the 11+ you won't get an accurate reading from the tailpipe because of the cats. I wouldn't be concerned im sure the factory tune is safe and you have a warranty.

[slownbmta]

You think they are going to drill a new bung in every car at a dyno day???


I wouldn't get on it until it's checked out for sure. Expensive motor to blow up.

[dville_gt]

In the tailpipe. It does still have cats. Am I so dumb that I didn't realize that would affect the a/f the sensor reads? It looks like it.

I've heard something like at least .5 afr points if reading through the cats, but that is all dependent on the cats and exhaust setup, could be even more. So at the very least you are 14.5:1 but could be somewhere in the 13's. I hate that they read through the cats like that.

[46Tbird]

In the tailpipe. It does still have cats. Am I so dumb that I didn't realize that would affect the a/f the sensor reads? It looks like it.

[dville_gt]

The other ones I saw didn't seem this lean. But I can see how placement would have an effect on it. I'm still a little concerned.

Where did they place it? Hopefully not after the cats!

[46Tbird]

The other ones I saw didn't seem this lean. But I can see how placement would have an effect on it. I'm still a little concerned.

[90GT50]

From what I heard a lot of cars were getting lean numbers on the wideband there. It could be the placement of the sensor, or the actual sensor itself. I wouldn't worry about it.

[46Tbird]

390/371

I'm worried about the a/f. What do you think?