You can get some more power but only turn it 1/2 to one flat at a time..
The power increases as does the smoke, up to a point..then all you have is To much smoke and power goes down and heat goes up..

 

thanks I acually bought the injector pump from internatinal truck parts and I had a lot of friensd tell me they thought it was running really lean so I think it was set pretty low.
Thanks

 

Pardon my ignorance and newbish questions in regard to this...

Lets say you went from a stock exhaust to a 3.5" single exhaust and did whatever common mods you can do, if any, to increase intake air. Would you be able to turn the IP up more because of the better flow since it's a NA diesel, or is that irrelevant because it's a diesel?

Should these motors run smoke free when dialed in to factory specs?

 

Black smoke occurs when you are not getting enough air to burn the amount of fuel going into the cylinders. The better it breathes the more fuel it can take without it smoking. If everything is basically perfect it is normal to have smoke under hard throttle until the rpm's catch up and the air fuel gets to the right ratio. You don't want to play with the pump unless you have a pyro as too much fuel creates heat in the cylinders and pistons start melting and scoring at around 1250 degrees.

 

With larger exhaust and a better intake you can get slightly more air into the engine and increase the fuel slightly.

But in a simple example 14 PSI air pressure at sea level.
So a NA motor has 14 PSI of air going into the cylinder.

A turbo boost gauge reads air pressure above relative air pressure, so a turbo boosting to 14 PSI would actually have 28 PSI of air pressure going into the cylinder.

Without taking heat expansion and other things into consideration, the turbo engine at 14 PSI boost has twice as much air in the cylinder.

So in a perfect world without higher heat of the intake air, you could burn twice as much fuel and double the HP.
In the real world, the higher intake air temp limits you to about a 50% increase in fuel and HP for the high end of the power improvement.

Going back to the original question, until you are forcing air in to the cylinder, your improved intake and exhaust will probably be under 5% increase in how much air is in the cylinder.

5% would take the power from 185 HP to 194 HP.
50% takes you from 185 to 277.5 HP.

Since the IP is mechanical, with a manual tranny you can roll black smoke at almost any IP setting.

Idle RPM, third or fourth gear, floor the throttle and you have lots of black smoke.

 

ya mines a 94 idi factory turbo so it wont roll as much black smoke as yalls will when turned up

 

my pump is slightly turned up, and I got 400 miles outta my last tank of fuel......