Detroit 11.1

If you can turn that truck up so that it's over 400 horsepower without spending a ton of money and doing a ton of work that's the best plan. It will still be dependable and fuel efficient.

If you only have 450,000miles on that engine, it could last you a long long time. I would just turn it up to what they said and enjoy the reliability of that engine for many years to come.

 

Fitzgerald had problems with their after market rebuild kits for a couple year streak. That's where your problem lies. Going cheap on parts and cheap on labor.

 

Im using a 1996 11.1L 365hp, its all original as far as I can tell. Im Hauling a dry van around the city with some hills but nothing serious. For me its more than enough power. I thought about turning it up to 400 but its plenty as is. Im getting 18-20psi boost max from the garrett turbo. Which seems low but works for the job. EGT seems to peak around 850 degrees but i dont have any long pulls to do. The engine hits about 125psi fuel pressure at max rpm and cruises around 65psi. Overall the fuel use is not bad, this truck can do lots of work on a half tank.

It does seep oil here and there but not terribly. The air conditioning is gone because the timing cover support for it is worn out. No jakes, basic engine.

A C15 or N14 has more power and can pull harder for sure but this detroit is pretty good for its category. Idle it all day or boost hard and it seems to want more. Im no expert but I heard the high power series 60 engines had stronger pistons. Possibly addressing the pistons would be wise for a high hp tune.

Id like to see a 12.7 500hp calibration on a 11.1L with the right mods thatd probably be good for high rev power.

 

@benjamin260_6 , resurrecting an old thread. What cam and injectors would you use on the 11.1L to get more HP and torque? 12.7, 14L or marine stuff?

 

Depends on what you have now and how much power you're trying to make

 

500 HP and 1650 just like a 12.7. What needs to be changed to get those numbers?

 

I need to know what parts you have now. What's your serial number and hp/tq?

 

Well, uh, I don't actually have an 11.1 L Detroit. I'm driving a 2008 Cascadia with a 14L Detroit EGR system, DPF but no DEF. It has 870,000 miles on it so when it is time for an overhaul, I'm thinking of installing an extrude honed exhaust manifold + BW 171702 turbo BUT I want to reduce the displacement AND add power. Kind of like having my cake and eating it, too. The 12.7s can be tuned to 600 HP and over 2000 ft-lbs of torque and my 14L can be tuned to 900 HP. My thinking is with the EM, turbo, a different cam (maybe 308) and 5915 injectors (they get the best fuel mileage) that 500 HP and 1650 ft lbs of torque should be doable from a small 11.1 L engine and still get great fuel economy.

The 500 HP Cummins ISM makes 500 HP and 1550 ft-lbs of torque from just 10.8 L but that small block engine was only sold in RVs because it wasn't designed for OTR work. Still, the numbers tell me that this is doable.

I know that most guys want more torque for the hills and driving in BC, I'd love more torque but fuel is killing me and literally sucking of all my profit and I don't want to buy a DEF truck.

 

To do what you're talking about doing, you have to change pretty much all the internals including the crank. Then you'll have to change the head and ECM to run those injectors which aren't the best on fuel...they're the most overrated "upgrade' for a Series 60. To top it off, you're not going to get great fuel economy just because you lowered the displacement...it doesn't work like that.