Quick Answer

Quick Answer: Are compound turbos worth it?

The primary benefits of compound systems are great low-end torque, strong mid-range and exceptional top-end performance. This is because a small (high-pressure) turbo is utilized to get things started at lower rpm, while a larger (atmosphere, or low-pressure) unit takes over at higher rpm.

How do compound turbos work Cummins?

Compound Turbochargers Explained

How much HP can you get out of a 12 valve Cummins?

Adding a P7100 to the first generation 12-valve engine effectively takes the truck’s horsepower capability from 350 rwhp to 600 rwhp. For those kinds of gains it’s definitely worth the hassle of hunting down all the conversion parts you need.

What turbo does a 12v Cummins have?

Holset Fixed Geometry Turbocharger

1st Gen 5.9L Cummins Years: 1989-1993
Compression Ratio: 17.0:1
Firing Order: 1-5-3-6-2-4
Fuel Injection: Bosch VE44 Mechanical injection pump, mechanical injectors, direct-chamber fuel injection
Turbocharger: Holset Fixed Geometry Turbocharger (VGT)

Do compound turbos need intercoolers?

A compound turbo system makes big boost and keeps both turbos in an efficient zone on the compressor map eliminating the use of intercoolers in this setup. Remember, efficient air is cooler air. The high-pressure turbo is a GTX4202R and the low-pressure turbo is a GTX5533R Gen II.

Is compound turbo better than single?

A properly engineered Compound/Twin Turbo Kit, will translate into much more horsepower, much lower EGT’s, better fuel mileage, a much broader RPM range (quick spool up, with huge high end WOT potential), and, overall, a much more drivable, high performance truck.

Do compound turbos spool faster?

compound turbos will spool up faster than a single turbo because you have so much airflow thru them even when they are spinning slow.

How do you size a compound turbo?


Will compound turbo lower EGTs?

Yes a larger single is not ideal for towing. A smaller turbo would spool faster then compounded with a larger charger in a twin set up will get you a end result of quick spool and lots of air.

What year 12v Cummins is best?

Among its strong suits are

  • P7100 (The Holy Grail) While the 12-valve was built from 1989 to 1998, most people look for the 1994-98 model.
  • Affordable Injector Upgrades.
  • Simple Designs.
  • HX35:
  • Free Horsepower.

How fast is a stock 12 valve Cummins?

Registered. Mine is about 120 mph.

What is a 12 valve Cummins worth?

A shop skilled in Cummins swaps will charge around $12,000 to $15,000 to take a 12-valve version with the 5R110.

What’s better 24v or 12v Cummins?

When it comes to serious power and performance the 12v 5.9 Cummins takes the win. These engines are known to hold up better at extreme power levels when compared to the 24v engines.

What will 4k governor springs do for my 12v Cummins?

The Industrial Injection 4000 Governor Spring Kit is by far the best modification you will ever do to your 12 valve Cummins engine. The factory governor generally will slowly start to defuel the engine around 2300-2400 rpm and drastically decrease performance and pulling power.

Why are 12v Cummins so good?

What made the Cummins so popular was the fact that its peak power and torque was insanely usable—in fact, the redline is only at 3,000 RPM! The 12-valve was able to get respectable fuel economy while producing torque figures never-before seen in an ordinary pickup truck.

How do you choose a turbo for a compound setup?

An easy way is to determine the amount of power you’re wanting to create, then look at compressor maps for different primary turbos. Usually we can make around 7-8 hp per lb/min. A primary turbo in a compound setup will not make as much power as it would in a single turbo setup, maybe around 3/4 the power.

How do I cool my turbo?

Drive your car gently for the last minute or two of the drive, or let the car idle afterwards for at least 60 seconds. By letting it run. the oil will continue to circulate and cool down the turbo.

What is the importance of knowing the turbo compound engines?

The electric turbocompound system also provides more control flexibility in that the amount of power extracted can be varied. This allows for control of engine boost and thus air/fuel ratio.

How much boost can a single turbo make?

How much HP does a single turbo add? Hanging a turbo on a small engine allows a little engine to breathe big. With only 6 to 8 pounds of boost pressure, a turbo can increase power output 15 to 25 percent or more over a naturally aspirated engine.

What is a sequential turbo?

Sequential turbocharging refer to a set-up in which the engine uses one turbocharger for lower engine speeds, and a second or both turbochargers at higher engine speeds. This system is intended to overcome the limitation of large turbochargers providing insufficient boost at low RPM.

What is a compound turbo kit?

Difference between Twin Turbos and Compound Turbo Kits | Diesel Power

Do twin turbos spool faster than single turbo?

Twin turbos are fantastic for the daily driven or mostly street-driven car. Each turbo needs the exhaust from only 4 cylinders to spool, so it spools much faster than a single kit. Smaller turbos in a twin-turbo kit can also produce similar power as a larger single turbo.

Do smaller turbos spool faster?

Smaller turbos spool up much faster than a single large turbocharger. Manufacturers may also use strategies such as using a small and a big turbo at the same time. The small unit spools up faster for low to moderate speeds, while the larger turbo kicks in at very high speeds.

Are compound and sequential turbos the same?

nm12valve basically sequential is small turbo for quick spool then gates open to let exhaust to large turbo for high airflow and boost, compound all air goes thru 1 turbo then compressed air into next turbo hence compound.

How do I know what size compound turbo to buy?

Compound Turbo Sizing

How much HP does a turbo add to a diesel?

A turbocharger works with the exhaust system and can potentially give you gains of 70-150 horsepower.

How do I know what size turbo I need?

The calculation is simple: Divide the absolute outlet pressure that you think you want (14.7 + boost pressure) by the absolute inlet pressure that the Earth says you can have (14.7) and you’ve got your pressure ratio. Limiting yourself to a reasonable number is the hardest part.

Why are EGTs so important?

Why is EGT important? Because if your in-cylinder temperatures get too hot, you can melt pistons, crack heads, destroy turbos, and create general havoc within your engine. A diesel needs a certain amount of heat to run, but high EGT should definitely be avoided.

Will a bigger intercooler lower EGT?

Adding an intercooler to an engine without one will simply cool the intake charge, provide more oxygen to the cylinder, and will also lower EGTs.

Does more boost lower EGT?

lowering fuel and increasing boost would get your egts down. Your essentially adding more air. But as you know when you increase your boost your compressed air temp increases.