1999 Caterpillar 3406E 2ws High EGT's

I really don't know enough to comment on this other than to say that boost is compressed air, which is heated by compression. I suspect you may have more boost than you can use and your drive pressure is too high.

I suspect that a 78mm x 1.45 housing would be better on Pyro temperatures and provide a more balanced drive pressure to boost pressure ratio.

Please wait for replies from other folks that know a lot more, but that is my guess.

 

Because it's too small for the top end. You need a bigger hot side. You should also talk to whoever put that file on there. They should be able to tell you what size you need. I ran an 80mm with a .32, .45 and .58 and the 32 was fun down low but the 58 was a beast on the interstate. Ultimately, the middle ground is a nice compromise between them.

 

I don't think so. It was the perfect middle ground on my 5EK. Really depends on how you're working the truck though.

 

I'm assuming from your post that CAT did not tune this.

Am i wrong?

 

The 2WS didn’t have a non waste gate turbo as a factory option. So I would find what that turbo really is.

High EGT is usually caused from insufficient air flow. It’s very common for a turbo to make a lot of boost but still have a leak that is causing air loss. 40psi sealed is a far cry from 40psi with a leak. You need to find a way to close off the fresh air inlet of your turbo. Put a regulator in the intake on left side of head there will be a couple 1/4 NPT plugs remove one put your regulator set to 10 psi there and shop air. Spray everything down from your boost gauge line to the clamp that holds the compressor cover on your turbo. Also check bottom of your air drier as I have seen boost evacuate there due to the air compressor draws its filtered air from the intake. Also make sure you have no leaks from head to turbo on exhaust manifold as that causes you to loose drive pressure. If all that checks out, pull the exhaust housing of turbo and check the exducer wheel something could have fell in exhaust housing and went through it. It takes little damage there to have a big effect.


I personally would run a non gated 1.45. It’s a good middle of the road. I have however seen dyno pulls done on 14.6L E models were the only changes made between the pulls was exhaust housing from 1.32 to 1.45. The 1.32 made more boost, had a 100 degree higher exhaust temp and made a whopping 10 horsepower less than the 1.45.
None of that is significant enough to get excited about. I do prefer the 1.45 for the slightly slower spool, it saves your compressor for 1 and less boost is always better. That chuff or bark you hear when backing out of a 1.32 housing is a warning that ####s coming apart sooner or later

 

My personal opinion. There's a ton of guys out there doing bad tunes. Yeah, you got a lot of power, it's fun to drive, etc.

I'll reword that and say irresponsible tunes.

I doubt you're anywhere near 550 horse