Hi, it is time for an overhaul for me.
I have a 12.7 detroit series 60 DDEV 4 2002.
Run it at 650hp / 2150tq for many years.
My engin guy rebuild it now as a 14L with crank, rod, piston and liner.
I would like to have more low rpm power. I cruising at 1400-1425 rpm.
what cam and injector should I use ?
I run it with borgwarner s410 78mm for now.
Detroit series 60 rebuild
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So you had a 12.7 bored and now using 14L crank rods and pistons?
So what cam and injectors are you currently using?
At what rpms does it start building boost?
I am just curious what your current setup is?
I find 2 variables that most don't talk about when talking about low range tourque.
1. when does it start building boost? (Engine rpms)?
2. What is the speed of the turbo when it starts building boost? (Turbo rpms?)
When you let off the clutch, you need both fuel and enough air right then to make low end tourque.
I think a lot of times bigger injectors, bigger cam, and a monster turbo will get you more Hp. That is great form something that runs all day at upper Hp.
But we don't factor in how do we get from idle to crusing speed over and over again.
What speed are you running?
Flat, hills, or mountians?
Do you have lots of start/stop miles or mostly cruising.
Sorry for my long winded response. I just wanted to stress bigger injectors , cam and turbo may not help pulling heavy and wanting to get rolling fast.Bean Jr. Thanks this.
Yes the engin was rebuild as 14L now.
I use a 309 camshaft and 7821 injector on my 12.7.
With the s410 turbo it start building boost at ~1275 rpm and be at 35 psi at 1350 rpm.
Max boost was around 48 psi ~1650 rpm.
I run on highway only. 50/50 flat and mountain.
Most of time cruise at 1400-1425 rpm.
@benjamin260_6 I wild use the 7014 injector !
For an future upgrade… I use s410sx 78mm turbo.
Any turbo advice ? That a working truck… but you know we like performance to
Bulleyes 83mm or go twin ?
How much boost are you building with your twin kit when you are working?
Compounds are great for racing or when you're making huge power on the weekends but still want good fuel mileage and drivability at work. However, I wouldn't really recommend compounds to the average person. An 80mm turbo can be pushed to well over 1000hp and still be set to spool up pretty good. Compounds are more complicated and much more expensive than a single so it can be hard to justify them.
I'd consider trying that bullseye turbo. I never have but my LP turbo is a bullseye and I'm really happy with it so farAModelCat Thanks this.
I have a 12.7 detroit. 600 flywheel hp with a billet wheel 1702 turbo and stock (5575?) injectors. considering mfg a compound turbo setup. Any ideas on turbos sizes or good injector #s to go with it? would i need to bulletproof the engine to handle the hp if i did tht?? Would tht excessively harm engine longevity or mpg?? Is second turbo necessary or would bigger injectors get me to where i want to be? (700-800 wheel hp)
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