Larger Fuel Injectors For Diesel Truck Performance
When you’re driving a diesel truck, the right mix of fuel and air can make a big difference to your final performance – and that means getting it right is one of the most important things you can do to boost your engine’s performance. So today we’re going to talk about fuel injectors, increasing their ability, and how you can get more fuel into the engine itself.
The first thing most people change is the tuning of the engine computer, tweaking the fuel injector’s duration (how long the injector is open for) and timing (when the injector starts to open) so that more fuel is added with every injection pulse at exactly the right time. In a basic tune-up, we do this by increasing the amount of time the injector is open (the pulse width or duration). Extending the pulse width in a common rail engine can easily double your horsepower, by putting large quantities of fuel through the stock injector.
Is it safe to change your injectors duration to those levels?
But then the question has to be asked – is it safe to change your injector’s duration to those levels? Well, as the duration increases, we have to account for the exact moment the injector starts to open (the main injection timing) – meaning that we would have to adjust the timing to land at the right spot in the compression stroke of the engine. When those two things are not aligned, the mismatch can cause unnecessary wear and tear from extreme pressure spikes at the wrong time, excessive smoke, and reduce the longevity and total output of the engine.
So how can you get this larger fuel quantity into the engine safely?
So how can you get this larger fuel quantity into the engine safely? After all, if you really want to increase power, increasing the fuel amount is is a necessity – and that means larger fuel injectors. By putting larger injectors into the truck (usually referred to as “percentage over”), we are able to get that bigger quantity of fuel into the cylinder, keeping the pulse width in a safe zone, and requiring less total injection timing. This controls cylinder pressure spikes, makes power more efficiently and evenly, and is overall safer for the engine.
Are All Larger Fuel Injectors Equal?
You might be wondering now: are all injectors the same? Are all larger injectors equal? We can say with confidence – absolutely not! There are a lot of different injector manufacturers, each with their own style and “recipe” for making larger sizes. Some differences could include the angle of the nozzle, number and size of the holes, and nozzle design (SAC vs. VCO, for example). Each of these affects how the injector runs, how the engine tunes, how it drives, how much smoke it emits, etc.
Schultz Diesel Sports is here to help you make the right decision when it comes to achieving maximum power from your diesel truck. We stock Dynamite Diesel Products (DDP) fuel system parts, and we are dealers for S&S Diesel, Exergy Performance, and Industrial Injection fuel system parts as well – so whatever you need, we’ve either got it here, or we’ll get it for you.
Let us help you decide what size you need and what will work best for your application. We’ll get your truck running better than you ever thought it would!
Adaptive Transmissions and Relearning
For a lot of people, the inner workings of an engine are a mystery – and so is the ability to peer under a hood and get an idea of what’s going on. But the days when our grizzled old grandpa could remove a transmission, fix it up, and replace it are long gone, thanks to the rise of electronics that monitor and adapt to how an engine runs. This is especially common now in diesel engines.
Today’s transmissions are much more complex than they used to be. A few decades ago, transmissions were commonly only 3-4 speeds, so while they did require some training to understand, they weren’t a complete mystery. Now, though, you can easily find 6-, 7-, or even 10-speed transmissions, each of which adds a layer of mechanical complexity. In addition, the role of electronic management in the engine has grown, too – so now overlaid on any transmission is a “smart” computer system, capable of adaptive learning using the data it collects while you drive.
Duramax Diesel Truck Balance Rates
If you’re big into diesel engines, especially the Duramax diesel engines, like we are, you have probably heard of balance rates. You are likely even familiar with checking them so that you can determine the health of the injectors in your Duramax. But do you know what they really mean, and how they work? Did you know that the simple numbers can be misleading without looking a little further? Balance rates can even be used to identify and help fix other mechanical problems, too.
I Just Got A Lift Kit And Bigger Tires, But Now My Truck Feels Slower!
So you picked up the truck you’ve been dreaming about, and had enough left over to go and get it lifted. You go to the shop to pick it up, looking through the window at it waiting for you. You can hardly wait to jump in and hit the road…
…but as you’re driving away, your excitement starts to fade. You’re putting the pedal down, but it just feels… slow. Delayed. Like there’s hardly any power getting to the ground. And the terrible news is – you’re not wrong. You’ve missed a key part, and your truck won’t feel right until you deal with it.
The First Things To Do After Buying A Used Diesel Truck
Can’t afford that brand-new, top-of-the-line diesel truck? We know how tempting it can be, and how hard it is to say no. But that doesn’t mean you can’t find something great out there that’s new to you. When you find that perfect vehicle that’s just within your budget, driving it home can feel like you just won the lottery.
But as with any lottery winning, you have to be careful that you don’t get more trouble than you anticipated. It’s no different with a used diesel vehicle – you don’t know if the engine looks good on the inside, if the parts are clean, or if the fluids are topped up. So why take the chance on breaking down before you even get a chance to really enjoy your new ride? Here are the top 4 things to do when you buy a used diesel truck, to make sure you stay on the road and moving fast.
Why Diesel Fuel Quality Matters
A lot of people aren’t aware of just how diesel engines work – or how precise the parts under the hood really are. While they operate, for all intents and purposes, on the same principle as gasoline engines, the demands of the components in a diesel system are much, much higher.
You may know that bad fuel filters and low fuel quality can be costly, but you probably didn’t think they could set you back $10,000 or more. It’s true – poor fuel can really wreak havoc on your entire engine! This is so important in diesel vehicles because of the extremely high tolerance points of each piece. For example, it's not uncommon for modern diesel engine fuel systems to produce upwards of 30,000 PSI; obviously, a pump, its fuel lines, and junction points that can handle this massive pressure have to be in optimal condition in order to operate.
The Myth of SOTF Truck Tuning
Tuning a diesel engine with switch-on-the-fly (SOTF) tuning is a longstanding trend that has been going on for many years in the industry. With plenty of after-market parts and options to choose from, it has historically been rather easy to change up the power potential of your truck, allowing for more or less torque and horsepower depending on the job at hand.
So what is SOTF tuning? Up until 2011, Duramax powered diesel trucks could have an upgrade installed called a DSP5 (Duramax Switchable Position 5). This upgrade began with an update to the electronic files in the Engine Control Module, using a custom EFI LIVE operating system, and was accompanied by a dial wired into the dash that allowed the driver to choose between five different settings (as pictured on this page). As this dial was turned, the ECM would change tune files in the operating system, changing the fuel pressure maps, throttle maps, etc. to match the setting and give more or less power to the engine.