6.7L Cummins intake tube

ShinerBock wrote:

kmbelt wrote:


You know that being able to hear the turbo adds 25hp.

Although I do know you are being sarcastic. Truck Trend and Dieael Power Mag have proven added hp gains by reducing intake exhaust resistance on turbo diesel engines at all engines speeds unlike N/A gas engines that do nothing but add noise. I have also seen it myself with before and after dynos. As I told tranzams9 above, diesel engines do not operate the way he is saying and he is describing how it works on a gas engine that has a throttle which controls the amount of air the engine takes in to control it's air/fuel ratio. Diesel engines are lean running engines and power output is controlled by how much fuel you add. This running lean adds to its efficiency so the more unrestricted air you have the more efficient it will run. Another benefit is for a diesel engine to reduce intake and exhaust restrictions is that it lowers EGTs.


"We went back to Flash Auto to quantify the changes on the chassis dyno, particularly to see if the horsepower gains on the 6.7L would be as great as the 5.9L since it did not benefit from a full exhaust upgrade. With the Edge Juice in the Stock setting, the 5.9L gained 38 hp and 117 lb-ft of torque, and the horsepower peak rose 300 rpm. The 6.7L was even more impressive, gaining 64 hp and 158 lb-ft of torque with just the intake and exhaust. Clearly there are restrictions on the 6.7L besides the DPF and exhaust catalyst, since they were retained."

5.9L Vs. 6.7L Cummins Diesel Engines - Cummins Vs. Cummins

That test takes 3 variables into account. Intake, programmer, and exhaust.

I want to see results of what difference just the intake tube actually makes. My guess it will me so small it is not worth the cost.

If you do it in conjunction with the other upgrades, then it would be worth it.