I went to see the DynoMan yesterday to get my annual emmissions test. Learned a couple of things.

I was worried that my truck wouldn't pass because of the 2 turns in on the full power screw. She gets real smokey when you romp on her. So I de-tuned her to stock settings before I went. I passed the test easily. 2% at 60 mph, 8% at 50 mph, 12% at 40 mph. The limit is 35% opacity.

What I was pleased to learn, and surprised to find out, is that Colorado DOES NOT do a snap test on light duty trucks. I always thought they did. That's why I was nervous about passing the test with my current setup. All they do is run it up to 60 mph, give it full fuel, then put load on the dyno to drag it down to 40 mph. Takes all of 20 seconds. Guess the sloppy torque converter pays off for this test! The rpms stay higher than they should!

So I'll spend some time setting up the injection pump the right way. I liked the extra power the 2 turns on the fuel screw gave me. But I was never happy about the smoke. So I'll turn the AFC cone to its deepest part, play with the star wheel and the smoke screw, then add some power with the fuel screw if I still want some more. Oh, and I think I'll add the 3200 spring in the next month or so as well. I'm shooting for a max of about 25-27 lbs of boost at full fuel. That seems to be all the H1C is good for at this altitude. (I once saw 27 lbs of boost at the entrance to the Eisenhower tunnel at 11,000 feet, but the EGT got real toasty real quick. So I was surely beyond the efficiency map of the turbo.)

Just thought that interested diesel citizens here would like to know this.

 

Good deal, Glad to hear you can run your truck the way you want it and still be legal

 

You will wish as I did that the 3200 RPM spring was one of your first mods. Mine is like driving a different truck now. Much better throttle response from idle to full throttle. You will love it.

 

I wonder if they can drag a high HP truck down to 40?

 

I would imagine so since the dyno and test site is really designed for heavy duty trucks. I suppose there could be a problem with wheel spin on the rollers. Maybe they coat the rollers with rubber glue ? Or just throw a load of concrete blocks in the back? Don't really know. But it's never been a problem for me .