Boost at lower RPMs -- tuning question

what exactly are you planning to do?

If you want to spool the turbo ya just gotta add fuel and lots of it! (actually, too much isnt good!)

ykdave said:

what exactly are you planning to do?

If you want to spool the turbo ya just gotta add fuel and lots of it! (actually, too much isnt good!)

Click to expand...

I'm wanting to try an idea I had when I owned a turbo'd four-cylinder engine. Since I sold that car, this is the only turbo'd vehicle I own. If it works the way I 'think' it should...it will spool the turbo sooner without adding fuel. It's a very simple idea, but difficult to explain through a keyboard .

But, my ignorance with diesels forces me to ask the questions in this thread -- will adding boost at a lower RPM (without any other changes) cause problems?

Have a good day!
Michael

Well, closing the orifices tighter to the housing will give you more boost at lower fuel levels. I wouldn't do it. More air without accompanying fuel will give worse power and fuel efficiency. Shouldn't cause trouble with the computer unless you manage to make more than 20 psi at the manifold. If the pressure exceeds 20 or so PSI the computer will "derate" the engine to prevent damage unless you have electronics to trick the ecm.

This sort of thing will work on gas engines, because the fueling system will compensate for the increase in airflow. On a diesel it just makes it mismatched through the entire power band. It might be possible to improve the factory setup but difficult. There ARE many different orifice size turbos that almost bolt right on. You might look at the various specs at Dodge Ram Information

i was in your boat until i got on here and did a LOT of reading. tuning a gas turbo car is a totally different world than a diesel turbo engine. forget everything you know about a/f ratio's, lean, rich, adding boost to make power, etc.
on these, fuel is added until there's no more boost to use it up, then you can worry about more boost or a larger turbo..

i got on here and was wondering why nobody uses boost controllers or anything until i realized that it doesn't matter what boost you make if you don't have enough fuel.