3406E turbo upgrade

this would be the next step up from your stock replacement your running now.
Oh and your not gaining anything by pinching the WG off.

 

Yup and more intake air heat. Does nothing for power. But geez look at this turbo spin!!!

 

Geesh, it actually cools the egts off generally. I know of several trucks that has to have it pinched off to keep cool under a heavy load, including mine when I ran a stock turbo and was pulling doubles grossed at 151,000. and I don't have a clue how much I gained, but at the very least 14 pounds, I would back out of it at 40.
You can get that same turbo 177148 turbo without a wastegate, and pull 50 pounds with a little programming.
You can also get turbos with more on the top end, but there is a trade off and it is usually slower spooling, and the need to keep your rpms higher.

I have the one with the wastegate, and picked up a half gear on many of the hills.

 

i

it cools the EGTs that you see on the dash. which is post turbine wheel. really not a good indicator of actual exhaust temps. accurate data would be from the flange just before the turbo.

it will drop the EGTs on the dash gauge yes, but its not really dropping them. When the wastegate line is not blocked the waste gate will open somewhere between 10 and 20psi. once its open the wasted exhaust gas then comes straight out of the manifold, through the wastegate and onto the sensor and out the dump pipe. effectively when the waste gate is open the sensor is reading gas directly from the engine.

when its blocked all the gas has to travel through the turbine wheel before it can go out the dump pipe, passing the sensor. because of this the time the gas is traveling around the turbine wheel it is being cooled by the ambient temperature on the other side of the housing. because it is forced around the turbine wheel where the housing acts as a heat exchanger to the ambient air it will be cooler by the time it reached the EGT sensor.

so given that, yes the gauge shows cooler EGTs, but the engine isn't really seeing cooler EGTs.

 

I can see what you are saying, but I also know one in real world working that was pinched off all it's life and still run max egt's with the programming, the loads it pulled and the steep grades we pull, with no problems.
I did not run mune long, but tghe turbo had a lot of miles on it before I pinched it off, so as soon as I finished pulling the doubles I ooened it back up. It was not long before it broke the shaft then, I do not know if that had anything to do with it, or it was just time to go.
I do have a hole drilled, tapped and plugged in mt exhaust manifold for a pyro probe, but have it in th epipe.

 

How much boost is too much for a stock 3406e? I usually pull 36 but this morning was cool and air must have been good I was getting 42 and could have went higher but I had to let out of it on every hill so I stayed back down around 36

 

Are you running the stock cat turbo with wg pinched or a Borg warner??

The engine is fine at those boost levels , it's the turbo that might go boom depending on what your running and how you run it.