Ecoboost AFR under wot

[Timmonsxp1]

I'm just wondering what kind of AFR everyone is getting under wot.

C&L CAI
MAP intercooler
Mishimoto Catless Downpipe
Steeda BOV adapter
Stage 3 Cobb v3 tune (93 Oct)

After installing the new catless downpipe and loading the stage 3 tune.
I'm seeing low 10s on the AFR under wot.
Down from 11s without the catless downpipe.
Just curious to see what everyone else is seeing on ratios with mods.

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[FreePenguin]

That’s fine
It’s for safety
I hit 10 and 11 on ford perf

 

[Timmonsxp1]

That’s fine
It’s for safety
I hit 10 and 11 on ford perf

Oh really. It feels fine on the pull but I was just making sure that wasn't crazy low lol

Also I've been smelling a lot more gas. Is that because of the stage 3 tune.
Also adding the DP adds more air so are the sensors just adding more fuel?

 

[FreePenguin]

Oh really. It feels fine on the pull but I was just making sure that wasn't crazy low lol

Also I've been smelling a lot more gas. Is that because of the stage 3 tune.
Also adding the DP adds more air so are the sensors just adding more fuel?

It’s running a bit richer, to compensate for more free flow.

When you add a downpipe catted or catless, you free up the restriction in exhaust, without a tune change you are leaning the engine out, and forcing the ecu to compensate by trimming a lot as you’ve experienced.

the 3rd stage tune, is enrichening as it should, it’s tuned for more flow, and isn’t forcing the ecu to work as hard outside base parameters.

Imo I wouldn’t worry, if feels good, I’d rock it.

also, richer is safer, leaner goes to boom in terms of engine safety.

in fact, you may still be adding more fuel on top of the increase in fuel, due to stage 3 designed for 200 cell cat and you are 0 cell cat,

But imo. You’re running better on 3 than 1/2 safer.
Only way to get better results would be a pro tune, since can dial you in as a catlsss

or toss a 200 cell catted dp, as thetune is designed for 200 cell high flow cat

and you’ll smell fuel because catlsss with proper fuel/flow. Cats remove the smell as it burns in the cat

 

[Timmonsxp1]

It’s running a bit richer, to compensate for more free flow.

When you add a downpipe catted or catless, you free up the restriction in exhaust, without a tune change you are leaning the engine out, and forcing the ecu to compensate by trimming a lot as you’ve experienced.

the 3rd stage tune, is enrichening as it should, it’s tuned for more flow, and isn’t forcing the ecu to work as hard outside base parameters.

Imo I wouldn’t worry, if feels good, I’d rock it.

also, richer is safer, leaner goes to boom in terms of engine safety.

in fact, you may still be adding more fuel on top of the increase in fuel, due to stage 3 designed for 200 cell cat and you are 0 cell cat,

But imo. You’re running better on 3 than 1/2 safer.
Only way to get better results would be a pro tune, since can dial you in as a catlsss

or toss a 200 cell catted dp, as thetune is designed for 200 cell high flow cat

and you’ll smell fuel because catlsss with proper fuel/flow. Cats remove the smell as it burns in the cat

Thays what I thought was happening. It's just nice to have someone else clarify. I still would like to protune the car eventually. I hear it makes a big difference. But for now It's running good.

 

[Cory S]

LOW 10’s is too rich period... That’s around a .69-.70 lambda. 10.7-10.8 is still a little rich. Ideal WOT is 11.3-11.7:1.

 

[FreePenguin]

LOW 10’s is too rich period... That’s around a .69-.70 lambda. 10.7-10.8 is still a little rich. Ideal WOT is 11.3-11.7:1.

I’ve hit high 10s but I generally see 11 as you mentioned. I’ve read ford perf is pig rich but, I think that’s kinda safe that way. Idk.

 

[Cory S]

I’ve hit high 10s but I generally see 11 as you mentioned. I’ve read ford perf is pig rich but, I think that’s kinda safe that way. Idk.

There’s a big difference between safe and pig rich.......

 

[FreePenguin]

So fords method is bad? My plugs was perfect after 25k with fp tune. Didn’t look like any fouling from the pig rich theory

 

[Cory S]

So fords method is bad? My plugs was perfect after 25k with fp tune. Didn’t look like any fouling from the pig rich theory

He said he was using an OTS Cobb map.......

 

[FreePenguin]

He said he was using an OTS Cobb map.......

No no. I meant, 10s, it’s rich yeah but ford does it too. It’s a safety measure, what is “too rich”? At what point does it become flooded?

 

[Timmonsxp1]

No no. I meant, 10s, it’s rich yeah but ford does it too. It’s a safety measure, what is “too rich”? At what point does it become flooded?

Yeah I'm using the stage 3. I didn't really get down on it on the way home today. Normal driving is 13.8 to 14.2 which is normal.
I also JUST returned to stage 3 two days ago. I did hear you have to let the ECU learn the new tune. But i will make sure it was saying low 10s it could have been high 10s

 

[FreePenguin]

I’m sure it’s fine. It’s doing what it’s designed to do, more power, meaning more rich for cushion. That’s my logic.

the tune is designed around stock heat plugs so rich. Pro tuners have people toss colder plugs in, maybe that’s why they run higher afr on the tunes

the richer fuel could be a safet for the tune with stock plugs, same with ford tune

 

[Timmonsxp1]

That's why I wanted to see if anyone was running catless. I wonder if that makes a difference compared to a 200 cat. Is the afr 10s because I have CAI and catless pipe. That's a lot of extra airflow.

 

[FreePenguin]

More rich fuel means cooler temps,

So let’s use ford and Cobb idea

stock plugs- richer fuel= power with cooling

protuners

colder plugs, leaner power= power with cooling

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