Different engine behavior between 2nd and 3rd gear

[mompracen_bs]

Hi, have a TransitCustom 2.0 ecoblue (2016 year), 1st and 2rd engine are flat then in 3rd pull hard.
Both from the original and after a remap, It's stronger but still has a huge difference 2rd Gear to 3rd gear.
(EGR disabile by remap and blanked by plate)

Do other users have the same impression when driving their Transit?

Is something wrong or do these Transits have a "torque limiter" that depends on the gear selected?

If Is "torque limiter" can FORScan manager It?

Thk

[metalworker0]

Here's what AI says about it , think just about covers everything, and not owning a vehicle with traction control i would have thought it it was either on or off with the button , .. but you re saying you want to alter the way traction control works when on .

AI Overview
Based on common symptoms of a car feeling sluggish in low gears and pulling hard later, this behavior is usually caused by issues related to boost pressure (if turbocharged), fuel delivery, or torque management/traction control.
Here are the most likely causes for an engine feeling "flat" in 1st/2nd and pulling hard in 3rd:
Turbocharger Boost Leak (Most Likely): If your car is turbocharged, a boost leak (e.g., loose intercooler hose) can cause low boost pressure in lower gears. As you reach 3rd gear and hold the throttle longer, the engine may finally manage to build pressure and "pull hard," whereas, in 1st/2nd, you are shifting too quickly to build sufficient boost.
Torque Limitation/Traction Control (Tuned/Modern Cars): Many cars are electronically limited in 1st and 2nd gear to reduce wheelspin. 3rd gear often has a 1:1 ratio and lower torque limitations, allowing the engine to pull much harder.
Fuel Pump/Delivery Issues: A failing fuel pump may struggle to provide adequate fuel under the higher-load, low-speed conditions of 1st and 2nd gear, causing a "flat" spot. Once in 3rd, the fuel pressure might stabilize.
Dirty Mass Air Flow (MAF) Sensor/Air Filter: A restricted air filter or faulty MAF sensor can restrict airflow, resulting in poor acceleration at low speeds.
Transmission Slipping (Automatic): If the transmission is low on fluid or has internal damage, it may slip in lower gears (RPMs rise, but speed doesn't) before fully engaging in 3rd.
Steps to Take:
Check for Engine Codes: Use an OBD2 scanner to check for hidden codes (even if the check engine light isn't on).
Check Boost Hoses: Visually inspect intercooler hoses for cracks or loose connections.
Inspect Air Filter: Ensure your air filter isn't heavily soiled.
Check Transmission Fluid: Ensure the fluid level is correct.
If you are driving a manual and the engine RPMs rise quickly in 1st/2nd, but the car does not speed up accordingly, it is likely a worn clutch.

[mompracen_bs]

Thanks for the directions.
I tried some checks as they say on the internet.
-The turbo actuator seems to work well, physically looking at it, with the engine off it is completely open, when the engine is started it closes everything, when accelerating it remains closed and then progressively moves to open.
-turbo pressure seems to be present in all gears, however also looking at the"commanded boost pressure" It seems that for the first 3 or 4 seconds it increases but too slowly.

But I can't quantify whether it's a small thing (and normal wear or fatigue after 100k) or if it can significantly affect the engine's behavior.

PS
I disabled traction control, but it doesn't seem to make any difference.

[metalworker0]

what it does not say on that google AI report is anything to do with the DPF

You do know, so ive heard O'Riley say ... that readings on the DPF can be altered ...as in a 50 percent full DPF can be reset to zero full, as in telling the monitoring software its had a new DPF.. so all readings from then on will be minus 50 percent that you cant see.

can Only be checked out with a boroscope

all the best.mark