When pushed to its absolute limit, the OEM fuel system on the 6.7L Cummins (lift pump, CP3, injectors) can support as much as 530rwhp and roughly 550rwhp with a turbo upgrade.
What kind of horsepower does a Cummins Engine have?
Even when Cummins changed to a different style connecting rod in its common-rail 5.9L engine (a rod that is generally perceived to be inferior in strength to the ’89 to ’02 units), 800 hp and 1,500 to 1,600 lb-ft of torque proved more than survivable.
What kind of crankshaft does a 6BT Cummins have?
In high rpm applications that required a better rod-to-stroke ratio, the 5.9L crankshaft is still employed in 6.7L blocks with frequency today. One of the most impressive hard parts in the 6BT Cummins is its forged-steel connecting rods.
Should I get a bigger or smaller turbocharger for my Cummins?
While an upsized single turbocharger can suffice on a daily-driven 6BT Cummins, big horsepower and drivability only go hand-in-hand to a certain point. When drivability isn’t as much of a concern as making horsepower is, such as in drag racing, truck pulling, or chassis dyno competition, a large single turbo makes a lot of sense.
What are the performance roadblocks of a Cummins Engine?
Performance Roadblocks of the 6.7L Cummins 1 Roadblock #1: Automatic Transmission. ... 2 TCM Tuning Helps. ... 3 The 68RFE Conundrum. ... 4 Roadblock #2: Head Gasket Issues. ... 5 Head Studs & Beyond. ... 6 Roadblock #3: Factory Turbo. ... 7 Fixed Geometry Turbo Upgrade. ... 8 Roadblock #4: Stock Fuel System. ... More items...
How much horsepower can you get out of a 6.7 Cummins?
SpecsDiesel EngineKey Specs6.7L Cummins® turbo-diesel370 HP 850 lb.-ft. torque Corporate 68RFE 6-speed automatic transmission 4x2 or 4x4 drive system 21,560 lbs. max. towing 5,730 lbs. max. payload1 more row
How much HP can a stock Cummins handle?
The 5.9L inline-six mill's factory rotating assembly from '89 to '02 is capable of handling 800 hp (1,400 to 1,600 lb-ft of torque) without breaking a sweat, and is often pushed into four-digit territory before aftermarket rods become a consideration.
What should I upgrade on 6.7 Cummins?
MUST HAVE UPGRADES FOR YOUR 2013-2018 CUMMINS 6.7L!Custom EZ Lynk Tuning. Tuning gives you the best bang-for-your-buck when it comes to dollar-per-horsepower. ... Aftermarket Cold Air Intake. Diesel engines make power by mixing fuel and air, then smashing it into combustion. ... Valve Body Upgrade. ... Lift Pump. ... Drop-In Turbo Upgrade.
How much HP does a DPF Delete add?
100-horsepowerIn many cases, a proper DPF delete will result in gaining over 100-horsepower while improving your fuel mileage and the lifetime of your vehicle.
Is 5.9 or 6.7 Cummins better?
To sum up, the more simplistic 5.9 fixed geometry turbo means that while it tends to be more reliable, the more advanced 6.7 variable geometry turbo gives better performance. The Exhaust Brake is a big part of why the 6.7 Cummins is such a powerful towing machine.
How do I get my 6.7 Cummins to roll coal?
12:1915:55HOW TO MAKE YOUR CUMMINS ROLL COAL!!! - YouTubeYouTubeStart of suggested clipEnd of suggested clipYou just slowly lay into your throttle just a little bit more and what that's gonna do is basically.MoreYou just slowly lay into your throttle just a little bit more and what that's gonna do is basically. It's gonna dump more fuel into those injectors. And it's going to make it smoke.
What do I need to delete my 6.7 Cummins?
If you do need or want to delete your DPF system, there are a few components. First, you will need a DPF delete kit. Second, you will need a proper DPF delete tune. While deleting these exhaust components mostly just requires bolting up some new piping, keep in mind that you won't be able to find a shop to do it.
Does deleting def system void warranty?
Regardless of local and state testing requirements, it is a federal crime to remove any factory installed emissions equipment. Removing emissions equipment also voids the vehicle's factory warranty. And before you say it, there is no way to keep a dealer from knowing that emissions equipment was removed.
TCM Tuning Helps
To reiterate, with sound TCM calibrating accompanying an ECM file that nearly doubles the 6.7L Cummins’ factory horsepower, the stock 68RFE can live under the right foot of a sensible driver. We’ve even seen one hold up in a truck making 570rwhp and more than 1,100 lb-ft.
The 68RFE Conundrum
Tearing a transmission down and stuffing it full of better parts usually yields great results if the work is performed by a reputable builder.
Head Studs & Beyond
Faced with a blown head gasket, and after resurfacing the head and inspecting the trueness of the block, most 6.7L Cummins owners opt to install ARP head studs when things go back together. At this point, the average tune-only (500 to 530rwhp) ’07.5-newer Ram is good to go for the long-haul.
Fixed Geometry Turbo Upgrade
Replacing the factory VGT with a T4 flange, a fixed geometry turbocharger is one of the best ways to wring every ounce of power out of the 6.7L Cummins’ stock fuel system.
Upsizing the Fuel System (From Tank to Engine)
For those that simply can’t resist pursuing more power, your upgraded lift pump, injectors and CP3 should be purchased according to your horsepower goal. For instance, a truck making more than 600rwhp needs a lift pump that’s capable of flowing 150-gph.
How much horsepower does a Cummins stock block have?
Stock Block: Unofficially Rated For 1500 Horsepower. During its production run, the 6BT Cummins’ gray-iron, non-sleeved, deep-skirt block was cast in Brazil (TUPY), Mexico, and even by International here in the states. The blocks cast by the latter manufacturer are said to have been the strongest ever produced, due to their higher nickel content.
How much horsepower does a 6BT have?
However, despite the immense restriction, with enough fueling and turbocharger (s) in the mix, it can still support 700 horsepower. CNC porting, bigger valves, and hardened valve seats are very common upgrades, and 12-valve heads that’ve been opened up can lead to significantly more horsepower while requiring less boost (i.e. aiding engine longevity). The 6BT’s factory valvetrain will tolerate more rpm than the 2,400 to 2,700 rpm the OE-prepped injection pump governs them to, but stiffer valve springs should always be added before the engine sees 3,500 rpm or higher.
How much horsepower can a Bosch P7100 pump handle?
For seekers of serious horsepower, the P7100 (a.k.a. P-pump) is the only way to go. Though the rotary Bosch VE pump found on ’89-’93 6BT mills can support as much as 500 horsepower when highly modified, a worked-over version of the Bosch P7100 can facilitate three times that. Even the 160hp version of the P7100, the least coveted of the bunch (found on ’94-’95 engines backed by the 47RH automatic transmission), can support north of 700 horsepower without upgrading to larger plungers. Once larger plungers and barrels such as 13mm or 14mm units are brought into the fold (for reference: stock plungers are 12mm), along with a custom grind cam, an Ag governor for high rpm fueling, and crazy timing advance, the sky is the limit. These purpose-built, competition pumps are anything but street-friendly, but can support well north of 1,500 hp.
How much rpm does a 6BT have?
The 6BT’s factory valvetrain will tolerate more rpm than the 2,400 to 2,700 rpm the OE-prepped injection pump governs them to, but stiffer valve springs should always be added before the engine sees 3,500 rpm or higher.
Can a Cummins 6BT have a single turbocharger?
While an upsized single turbocharger can suffice on a daily-driven 6BT Cummins, big horsepower and drivability only go hand-in-hand to a certain point. When drivability isn’t as much of a concern as making horsepower is, such as in drag racing, truck pulling, or chassis dyno competition, a large single turbo makes a lot of sense. Not only is a single turbo easier on the engine (due to its producing less boost and drive pressure than a compound configuration would), but a sizeable lone charger will require elevated rpm to keep it in its efficiency range. And as we mentioned earlier, at higher rpm the kind of torque levels that bend rods and crack blocks can be avoided without sacrificing horsepower.
How much horsepower can a stock 89-02 Cummins rod hold?
Although the stock ’89-’02 rods are good to 1,000 hp or more, a significant addition needs to be made before they’re pushed past the 800 hp mark. The factory rod bolts are known to back out with age, or fail under big power and elevated rpm. ARP ’s heavy-duty Cummins rod bolts are a very common and fairly inexpensive insurance item to add to any factory 12-or-24-valve connecting rod (ARP PN: 247-6303). The ARP rod bolts are nearly 25-percent stronger than the stockers, fit all 5.9L rods built from ’89-‘07 and retail for $160 to $200.
How much horsepower does a 89-02 truck make?
While countless motorsport applications made use of the factory ’89-’02 rods in engines turning out over 1,000 hp, it’s long been recommended that aftermarket rods be employed in street trucks attempting to make similar power. Reason being, a street application will spend a lot of its time at low rpm (1,500 to 3,000 rpm) whereas a competition engine will live at higher rpm (4,000-plus). In motorsport applications, the combination of low compression and high rpm, along with large turbochargers, leads to less torque being produced (lower peak cylinder pressure), which effectively keeps factory rods alive. The truck shown above made 1,400 hp on the engine dyno with a set of factory, shot-peened rods and survived more than 50 sled pulls before being torn down.
Is a 6.7 Cummins a 5.9?
It’s believed that the 6.7L Cummins is more susceptible to killing rods than a 5.9L due to its larger displacement (bore and stroke) and tick-higher compression ratio yielding more torque production (cylinder pressure). Those extra cubic inches are constantly beating up on the connecting rods and it’s only amplified as you stack power on top of the factory bottom end. Luckily, many reputable engine builders recommend aftermarket connecting rods and a corresponding built engine once an enthusiast ventures into 800 hp territory and beyond.
