Better mileage?
Posting Guru
Joined: Aug 2001
Posts: 1,533
Likes: 2
There isn't much room under the hood of a factory turbo IDI I had a good look at one the best thing would be is get set up to eliminate the factory air box. Black smoke is not enough air its probably time for a turbo rebuild if the truck has seen alot idling its probably coked up pretty good.
Change the IP pump and injectors don't even bother having the old ones tested just install new or rebuilt ones. You do that you will be good for another 10 years.
Change the IP pump and injectors don't even bother having the old ones tested just install new or rebuilt ones. You do that you will be good for another 10 years.
Senior User
Joined: Nov 2004
Posts: 305
Likes: 0
From: Bothell, WA
Just to recap what Dave said. All the turbo does is supply more air to the engine so it can burn fuel more efficiently. Opening up the intake, using low restriction filters, and opening the exhaust will accomplish the same thing in a non-turbo application, just to a lesser extent.
The turbo won't make a lot if any difference in milage until the intake and exhaust are opened up and opening up the intake and exhaust in a well tuned non-turbo will produce similar results just on a smaller scale.
Think of the difference this way. The amount of energy required to move a given load 1 mile can't be changed. If a non-turbo and a turbo engine are running at the same efficiency the turbo engine's ability to burn more fuel will only increase the speed at which it can move the load. In fact moving the load at the faster speed will require more fuel to overcome the increased air resistance.
The turbo won't make a lot if any difference in milage until the intake and exhaust are opened up and opening up the intake and exhaust in a well tuned non-turbo will produce similar results just on a smaller scale.
Think of the difference this way. The amount of energy required to move a given load 1 mile can't be changed. If a non-turbo and a turbo engine are running at the same efficiency the turbo engine's ability to burn more fuel will only increase the speed at which it can move the load. In fact moving the load at the faster speed will require more fuel to overcome the increased air resistance.
Post Fiend
Joined: Nov 2003
Posts: 21,285
Likes: 15
From: Nutter Fort, WV
tdford, you said that very well.
A turbo can increase the mileage if you drive like the turbo is not there.
But as soon as you use the turbo's extra power, mileage can and will go down.
Would you rather pull the hill at 45 while getting 15 MPG
Or would you rather blast up the hill at 70 while getting 10 MPG
Same thing can be said about doing intake and exhaust work.
Yes it will give you more power.
Yes it can increase the MPG's.
But it can not do both at the same time.
Wonder why my average is 10 MPG?
A turbo can increase the mileage if you drive like the turbo is not there.
But as soon as you use the turbo's extra power, mileage can and will go down.
Would you rather pull the hill at 45 while getting 15 MPG
Or would you rather blast up the hill at 70 while getting 10 MPG
Same thing can be said about doing intake and exhaust work.
Yes it will give you more power.
Yes it can increase the MPG's.
But it can not do both at the same time.
Wonder why my average is 10 MPG?
Probably from pulling the backhoe
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rsmiththethird
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