Low Boost under acceleration

Guys, I noticed today when towing my camper that from a stop, under full throttle I am only getting 10ish psi of boost in 1st gear, as soon as it shifts to 2nd I am getting 18psi. Is this normal? It never did this until today.

Will the tundra pull boost based on fuel? Or crappy fuel?

 

Can't say I've tried to go full throttle while towing. I've got the hybrid and under regular acceleration while towing the hybrid assists and the boost maybe goes to around 10.

 

geez, this things rips while towing, why the WOT?

are you in tow or tow + depending on your trailer weight?

 

That can be torque management in those lower gears by the ECM.
My Superduty diesel did that as well to protect the drivetrain under the high torque in low gears. It could still spin the wheels taking off while towing though.

 

Hey TW - I am looking into changing the plugs on my truck (33,xxx Miles) , This is what happening - not building boost - only 7-10 PSI in 1st gear and 15-20 in 2nd. Idle seems unstable too. What are your thoughts. Acceleration video link below.

Here is a link to the video - https://photos.app.goo.gl/tzHMCXvbfhVBGduQ9

 

Sounds like torque limits, truck doesn't want to give full power since 1st gear ratio would be too low and could break things. Nothing wrong with it, consider it a feature.

 

I could understand that if its been like that since day 1. But this just started happening with 31,500 miles on it. I have been towing 4K LBS pretty consistently with it too. Idle has been inconsistent too. running 91 OCT it will build a little more boost PSI also.

 

I am not sure on the Tundra as mine doesn't have the boost gauge but it is NOT uncommon for manufacturers to limit boost in 1st and 2nd gear. Keeps you from breaking things and tries to give usable power without loosing traction. You were getting 18 pounds in every gear before this? * Scratch That i just saw you said you were*

 

I was getting 18ish PSI of boost. It used to break the tires loose. My fuel economy has dropped also by 30% now and I am noticing the engine coolant level is below the low mark. Engine oil looks fine, not milky.

 

I can't imagine full boost in first gear while towing NOT obliterating the tire(s). It has to be limited.
But it does sound like something has changed.
Simple things first:
Looked at your air filters lately?

 

I replaced them within the last 2 weeks too. It would roast tires before all this, and traction control would kick in under full throttle from a dead stop. It's gutless pulling the 4k lbs camper we have now too

 

just speculating but maybe a plug fouled

Im trying to think do I get full boost in 1st gear, I mean its so fast to shift, Im not sure

try tow haul +, there is no torque management and see how she rips

 

I have worked on a LOT of Turbo vehicles and i cannot think of any that give FULL BOOST in the first two gears on an automatic vehicle.

The fuel economy and the rough idle make me think this is a ignition system issue. Check the coil pack connections to the plugs. But no misfire codes is strange if its that bad

 

I changed the plugs last night thinking the same thing and noticed the coolant was way below the low mark ( I look Everytime I change the oil). All the plugs like similar to the one below. After changing the plugs it still doesn't run any better.

About the coolant, I started/ran the truck today for about 1 min and it had a lot of pressure in the coolant container. I am thinking we got a failed head gasket

 

OK, oil isn't milky. Notice white smoke from the exhaust? The coolant has to be going somewhere.

 

Can someone send me a WOT video from 0-45/60 please. I want to see the turbo boost in 1st gear. I know it's quick and could break the tires loose, but I need this information. I am being told my truck is operating like normal. I need some help guys

 

My 2025 doesn't show much boost at all. Barely registers anything on the gauge. Wish there were a way to wake up the turbos somehow. Gotta think someone somewhere has a hack for that ... but then again, this motor hasn't really proven itself worthy of performance tweeks.

 

I guarantee you won't see full boost in 1st gear. It's called torque management. Computer is in charge.
Boost will raise as you get to higher gears.

 

I highly doubt it's a head gasket. There are two coolant tanks, one for turbo/intercooler and one for engine. It's possible that a turbo has a leaking seal or a cracked housing that is causing coolant loss, and loss of boost. But as other posters have said, computer controls boost and limits it. I would think it would throw codes if something were that amiss.

 

Or the low coolant in intercooler side is raising inlet temps and computer is limiting boost to prevent or is detecting detonation.

 

^This. The computer wont let you have full power at low gear low speed. In the new Ford superduty with 6.7HO, it wont let you b/c otherwise youd be smoking tires all the way to 60mph.

 

Before someone posts the video, see if this one helps.