High egt temps and lag

I'm no expert by any stretch but I'd say your stock turbo is worn out and not supplying enough air. I would bet that when you make those changes you will see a significant drop in those temps. Also, that Detroit will pull well down to about 1200 rpm, the only thing you're doing climbing a hill at 2000 rpm is burning excess fuel and putting a lot of strain on the already hot motor. You will see the egr go way up. Remember, 1300 deg and metal is starting to get soft and erode

 

Egt, not egr. Sorry

 

I kept my Detroit right at 1350-1400 when I had her. Was a good strong motor. Wish I had kept my freightliner and rebuilt it instead of trading for this Volvo motor. Oh well, too late now! Lol keep us informed on your progress!!

 

You need a turbo boost gauge so you know what psi you are producing, that with a pyro and you can generally start to work out where the problem is. E.g if you have low turbo boost then look at air leaks or poor turbo. If psi is normal then look at fuel. I luv having a pyro and turbo boost gauge.

 

A severe intake restriction will cause something similar, make sure your air filters are good, you don't have an intake hose collapsing, or a rag or trash bag over the intake. You laugh but I have seen it already, especially with the truck's that have the air filters under the hood instead of out side. If all this is good I say the same as Aussie Dave you have turbo issues.

Does this Detroit have the dual power ratings on it. I saw a 430/470 Detroit that had computer problems on the 430 side and it would just not run until a certain gear, where it was allowed to go to the 470 mode? After the computer let it have the 470 rating it would run fine.

 

Save you're money and buy a Borg Warner 171702 and you can get a brand new factory Detroit manifold for pretty cheap which doesn't justify spending all the extra money on a PDI one. Even if you were looking for more flow you could have the stock Detroit one ported and coat4ed and still be ahead by a lot.

 

I have the same 500 Detroit series 60. I sent my ecm to Rebel 127 and got it back the day after he got it. He improved my fuel economy at least 1 mpg and turned up the horsepower to close to 600. My egt temps dont go over 925 deg. no matter what now. Its a joy to drive thanks to him. The cost will pay for itself in fuel alone in no time.