Tuned ecoboost bogs down between shifts

[johmford]

Hey everyone, been lurking a while but I figured I'd get some feedback on an issue I'm having

I have a 16 ecoboost that has the 93 sct tune on it and an exhaust.
Regular driving is fine, but while using the track apps today to measure my 1/8 mile it bogged down after each shift, like a full second power loss then it springs back.

I notice also when I am coasting, in gear, the AFR Is at 20.0 but when I hit the gas that changes pretty quick but it seems very lean even for little throttle to no throttle.

Any thoughts?

Pic of the car just bcoz:

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[Nihil]

when coasting the AFR will go out of range then pull back down when you give it the throttle, are you auto or MT? I would wide open throttle between the gears if youre manual and see how that changes things...you got traction control on? that's usually what happens it goes oh snap you loosing traction, boom power loss.

 

[Kjewer1]

Coasting in gear will trigger coasting fuel cut, or decel fuel cut. The ECU knows you're off the throttle, and moving, and cuts the injectors off completely. All EFI cars since the late 80s at least have done this, for emissions and fuel economy. It will show up on the wideband as full lean, since the engine is pumping straight air past the sensor. The time you see it still reading lean after giving it some throttle is just the delay in the sensor, time it takes for exhaust to reach the sensor, and the WB unit and display itself.

 

[Busser48]

Hey everyone, been lurking a while but I figured I'd get some feedback on an issue I'm having

I have a 16 ecoboost that has the 93 sct tune on it and an exhaust.
Regular driving is fine, but while using the track apps today to measure my 1/8 mile it bogged down after each shift, like a full second power loss then it springs back.

I notice also when I am coasting, in gear, the AFR Is at 20.0 but when I hit the gas that changes pretty quick but it seems very lean even for little throttle to no throttle.

Any thoughts?

Who's your tuner?

 

[Stangman21]

when coasting the AFR will go out of range then pull back down when you give it the throttle, are you auto or MT? I would wide open throttle between the gears if youre manual and see how that changes things...you got traction control on? that's usually what happens it goes oh snap you loosing traction, boom power loss.

Coasting in gear will trigger coasting fuel cut, or decel fuel cut. The ECU knows you're off the throttle, and moving, and cuts the injectors off completely. All EFI cars since the late 80s at least have done this, for emissions and fuel economy. It will show up on the wideband as full lean, since the engine is pumping straight air past the sensor. The time you see it still reading lean after giving it some throttle is just the delay in the sensor, time it takes for exhaust to reach the sensor, and the WB unit and display itself.

This makes sense! I have a ecoboost 2016 and thought it was a malfunction error on mine. It's not just by chance or conditions but because of your driving. I'm glad I saw this post and answers because I was thinking of mentioning it to my dealer today. I had it only for 4 weeks and had to get the leather fixed. Already miss my Stang!

 

[jbailer]

As mentioned, the AFR sounds correct. Off the throttle, 20:1 as it is in fuel cut mode. On very light throttle, most cars will shoot for a stoichiometric value (best for combustion engines using unleaded fuel) of 14.7:1. For some reason on our cars, they seem to prefer 14:1. It should remain there until you are under heavier load/throttle where adding fuel (running richer) will help cool and prevent detonation. Most forced induction engines work best around 11.0 - 12.0:1.

 

[Kjewer1]

As mentioned, the AFR sounds correct. Off the throttle, 20:1 as it is in fuel cut mode. On very light throttle, most cars will shoot for a stoichiometric value (best for combustion engines using unleaded fuel) of 14.7:1. For some reason on our cars, they seem to prefer 14:1. It should remain there until you are under heavier load/throttle where adding fuel (running richer) will help cool and prevent detonation. Most forced induction engines work best around 11.0 - 12.0:1.

The 14.1 displayed is likely still stoich, though these and other newer cars can run any AFR closed loop. The dash display accounts for the stoich value given to the ecu. An aftermarket WB kit will show 14.7:1 typically at stoich regardless of actual fuel stoich, unless you reprogram it. 14.1 happens to be the stoich AFR for e10 pump gas.

 

[johmford]

when coasting the AFR will go out of range then pull back down when you give it the throttle, are you auto or MT? I would wide open throttle between the gears if youre manual and see how that changes things...you got traction control on? that's usually what happens it goes oh snap you loosing traction, boom power loss.

I will give a shot with trying to go between gears and see, I had the tractional control clicked off but does this car truly turn it off with one push? I know some cars you have to hold it or press it x amount of times...

The tuner is just the OTS SCT X4 tune. Nothing special, just the 93 tune which I hear is more mild than a bama race tune

Thanks for al the replies!!

 

[Busser48]

I will give a shot with trying to go between gears and see, I had the tractional control clicked off but does this car truly turn it off with one push? I know some cars you have to hold it or press it x amount of times...

The tuner is just the OTS SCT X4 tune. Nothing special, just the 93 tune which I hear is more mild than a bama race tune

Thanks for al the replies!!

No it's not off, it's in a soft setting

 

[PRG3k]

Hey everyone, been lurking a while but I figured I'd get some feedback on an issue I'm having

I have a 16 ecoboost that has the 93 sct tune on it and an exhaust.
Regular driving is fine, but while using the track apps today to measure my 1/8 mile it bogged down after each shift, like a full second power loss then it springs back.

I notice also when I am coasting, in gear, the AFR Is at 20.0 but when I hit the gas that changes pretty quick but it seems very lean even for little throttle to no throttle.

Any thoughts?

I think I know what you mean. The problem is getting back ON throttle after the gear change correct? Does it feel like the car is pulling timing for a second and then goes back to normal? This has been reported on a lot of Ecoboost's (both of mine did it and it was quite frustrating) and the AFR has little to do with it.

The Ecoboost seems to have a lot of fail safes programmed into it and its not something that I even fully understand or I feel has been fully explained anywhere. From what I understand this car will pull timing when certain conditions are met whether it be torque/traction management, knock protection due to heat soak, or probably the most common issue: overboost protection.

On a tuned car (or not) when you slam the next gear and abruptly get back on the throttle in a manual, the boost will spike back up. For reasons that still remain a mystery to me, the car can't handle it sometimes and pulls a little timing until things get straightened out. I remember I was showing my girlfriends dad the new car and experienced it the whole time, needless to say it was super frustrating.

I would look into a tuning device like the Cobb or something that allows for more info to be available to the tuner. Either that or talk to your tuner and tell them what you're experiencing. Adam has seemed to tune it out of my cars personality via the Cobb Accessport. I don't notice it doing it at all anymore so it is possible to eliminate it. I love this car but in stock form it is easily its own worst enemy.

And just as an aside, hitting the traction control only turns off part of it. To fully disengage it you need to make sure traction control is ON, then HOLD the traction control OFF for a number of seconds until you see 'Advance Trac Off' on the gauage display. This will allow you a little more freedom.

Hope this helped.

 

[w3rkn]

If he is not fully turning off traction control, all this could just be a traction event.

Happens all the time in my BMW 135is. Turn everything off, no more bog on powershifting.

 

[Busser48]

If he is not fully turning off traction control, all this could just be a traction event.

Happens all the time in my BMW 135is. Turn everything off, no more bog on powershifting.

Yea if you read the manual when you switch it to track mode it puts it in a relaxed state, or tuned specific state, but not off

 

[johmford]

I think I know what you mean. The problem is getting back ON throttle after the gear change correct? Does it feel like the car is pulling timing for a second and then goes back to normal? This has been reported on a lot of Ecoboost's (both of mine did it and it was quite frustrating) and the AFR has little to do with it.

The Ecoboost seems to have a lot of fail safes programmed into it and its not something that I even fully understand or I feel has been fully explained anywhere. From what I understand this car will pull timing when certain conditions are met whether it be torque/traction management, knock protection due to heat soak, or probably the most common issue: overboost protection.

On a tuned car (or not) when you slam the next gear and abruptly get back on the throttle in a manual, the boost will spike back up. For reasons that still remain a mystery to me, the car can't handle it sometimes and pulls a little timing until things get straightened out. I remember I was showing my girlfriends dad the new car and experienced it the whole time, needless to say it was super frustrating.

I would look into a tuning device like the Cobb or something that allows for more info to be available to the tuner. Either that or talk to your tuner and tell them what you're experiencing. Adam has seemed to tune it out of my cars personality via the Cobb Accessport. I don't notice it doing it at all anymore so it is possible to eliminate it. I love this car but in stock form it is easily its own worst enemy.

And just as an aside, hitting the traction control only turns off part of it. To fully disengage it you need to make sure traction control is ON, then HOLD the traction control OFF for a number of seconds until you see 'Advance Trac Off' on the gauage display. This will allow you a little more freedom.

Hope this helped.

Hmmm yea I was just pushing it once off. Did another run today and same result with 1-2 shift. I am driving a manual just fyi

I will give it a shot after holding the traction button to see if it's resolved.

Also, Anyone know what the max rev limit this engine can handle? I bumped it up a couple hundred but what experiences have yous guys had with the ecoboost motor at higher rpms?

 

[jjsotolongo]

The way the car is geared there is no reason to rev it passed 6500. Stock turbo and cooling system absolutely die on the top end. Only was I could see revs helping is if you change the stock turbo.

 

[TheWildman]

My car did the same thing during rapid shifts. Bogged down for a bit before kicking back into power. My tuner found that the throttle plate was closing up to prevent boost spike. Overboost protection I assume.
It can be tuned out.

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