Make sure your wastegate is blocked, closed and not leaking. More air will allow you to cool more fuel up to 35psi with a stock charger so a fuel plate and afc mod will help on the fuel side of things but 24psi isnt enough air. I could tow all day through mountains at 35psi and 1200* egt. After a loooong hill the engine temp would creep up but I could maintain speed and just let it cool on the backside of the mountain. Cummins recommends nothing over 1250* for an extended period of time but you can hit 1400+ for a short burst without hurting anything. I saw 1400 on the 4th to get a burnout started until my primary lit and cooled things off. Look for a boost leak. Intercooler boots are very common.

 

If you are getting outrun by a 318 gasser with only a few thousand less pounds, then something is wrong.

You should be able to keep your EGT's in check pretty easy with advanced timing, a 10 plate, and a GSK.

I agree that you need to be making more boost. It should cool it off some. You shouldnt be having EGT problems in 2nd gear at 40mph IMO.

Eric

 

Well, if thats the case then I need to fix it obviously.

What would one do to diagnose this issue? The only thing I can think of off the top of my head is exhaust issue, free gsk causing an issue, plate needs to be moved, AFC tune? etc...

Only reason I kinda butted in on this conversation is that HelenaTDI has a stock plate and a 4" and is having the same issues. Seems to put into question if an exhaust system would really help me out. Besides, I read Mr. Donelly say going above a 3" on a stock turbo will not give huge EGT gains due to the limited exhaust housing size...

With that said, even with the stock plate I was running up against the top of the EGT gauge. The local guys here have said I shouldn't have that issue with a 180 pump. Am I missing something?

BTW, Sorry HelenaTDI, not to take over your thread... I think we've got something in common though?

The 318 gasser can't outrun me on the highway at all... but can on those mountain passes. I have plent of peddle left, but EGTs say not to use it...

Joel

 

Joel, if your truck has over 80k and still has the cat it's likely plugged up and restricting your exhaust.
Lose the cat.
Even with mild hp upgrades the stock exhaust gets restrictive.
A 4" or even a 3" makes a world of egt difference.

My $2 cool air intake Modify Stock Airbox

 

Just ordered an Icebox from Mark. Hoping it will help as the filter has been in the open sucking nothing but hot air. I like the idea of blocking the waste gate. What is the max psi the 200K stock turbo can handle?

 

No problem on the hi-jack.. LOL!! Guess will see who can get the EGT's lowered the most first. Quoted $1600-$1800 from a diesel shop over in Missoula, MT today to do my advanced timing, 3K GSK, #10 plate grind, and star wheel adjustments. Told him he'd better ease up on the CRACK addiction. I don't have the tools to do the advanced timing or I'd do it myself. So needless to say looking for plan B.

 

Anything over 35 psi risks blowing the turbo apart.

 

Out of curiousity, if my truck is healthy running a #10 in the middle, what would the typical max boost be?

Unloaded I can't get past 22psi, loaded I can max out at 28 if it's the right conditions but typically 22-25 is all I can get before the EGTs are to hot to push the pedal more.

I am looking for a 4" to 3" reducer so I can replace the cat. So far no luck locally or online (I can find 3.5 but not 3). If I can't find that, I suppose I will just hollow the cat and see what happens.

Joel

 

I could get 28-32psi out of mine with nothing but an aftermarket plate all the way forward. Then when i put the GSK in, I could get 40psi out of it. I would think you could be able to get more than 22psi out of it unloaded. Stock it should make 18-20psi.

Eric

 

WOW

I think they are a little steep on the prices there. Bring that thing to KY and ill fix you up for a couple hundred

Its worth it to just buy the tools to do the timing if you are a decent mechanic. I have made my money back on my timing kit easily by timing trucks for people.

Eric

 

No doubt.. Too bad your not closer I'd take you up on the offer. 12 Valve Guru's are few and far between out here.

 

Was that loaded or not? And did you have exhaust mods with the GSK?


Joel

 

That was unloaded. I think you would see a lot more boost/power if you slid your plate all the way forward.

I had a stock exhaust that was straight piped, and then i went to a homemade 4 inch. I also had a K&N cone filter.

With just a plate/blocked wastegate/stock transmission/3in straight pipe/K&N the highest EGT i ever saw was 1300* pulling a 32ft trailer loaded with round bales of grass hay. It had decent power, but the transmission didnt put it down too well being stock. I was in 3rd gear with the converter locked at about 2500rpm on a hill with the pedal on the floor. When I put my GSK in, my EGT's went way up.


Eric

 

Dealer used to sell a cat test pipe, part number 52019170AB, that replaced the cat with a straight pipe.
They were about $35 if still available.

I've bought the 3"x4" adapters, pipe and clamps from Napa.

 

Did not know napa had that stuff. I was just going to pop it off this evening after work and gut it out... Bahaha, yeah right... 4 hrs later, I'm ready to cut it off.

I'll check with Napa, but I may finally have a line at another place too. I think I'll just get some 3" with a 3" ID flare on one end and then a reducer. By change would you know if the pipe on the truck is 3" ID or 3" OD?

Joel