According to our experience, one way to counter diesel smoke is to add a Surbo to the air intake of the diesel engine, at the air filter section. The Surbo will raise the air intake power as it creates a deep-suction vortex which compresses air, and this raises the torque and power of the diesel engine immediately, even at idle, shown by a higher idling speed. The driver would be able to move the diesel vehicle with less pressure on the accelerator due to the added air compression. Note that improved engine compression (in this case through higher air compression from the Surbo) directly results in an increase in engine efficiency, which means the engine will put out more power for the same amount of diesel put in, and so require less pressure on the accelerator. The diesel engine will also be able to rev to a higher rpm for the same accelerator travel, so that it can latch on the the next gear at a higher rpm and thus avoid over-stepping on the accelerator at too low an rpm and cause black smoke emission. The torque spread on a Surbo-equipped diesel is also wider, meaning more torque even at a low rpm, so the driver needs not press as much as before on the accelerator even at a low rpm. So, he can shift up earlier too, with less risk of causing black smoke. Downshifts can be made quickly and smoothly because the air supply from the Surbo is ready to meet sudden spikes in air requirement, and its air pressure holds the engine preventing it from losing too much rpm when the accelerator is released during a gearchange.
The Surbo can also be used on turbodiesels, helping the turbocharger to spool up earlier. This is because the compressed air from the Surbo, even from a low rpm, pushes air more quickly through the exhaust, which turns the turbocharger up to speed earlier, and so it is able to provide boost from a lower rpm. This reduces turbo lag, which holds back engine power at very low rpm, and can be a cause of smoke by itself.
Adjusting the bolt below the accelerator so limiting the accelerator travel and diesel input also limits diesel smoke, but engine max power is down too, and adding a Surbo can put back some of this lost power. See the Nissan Cabstar '00 review.
We invite you to read more about the Surbo on this website, and find out how it can be applied even to low-speed diesel commercial vehicles.
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