Dyno question....

so got my dyno report today ....truck was set at 470 and it peeked at 400 ...3.3 blow by??? is that something i should worry about?

2003 freight century 12.7 l ..13 speed 816k miles


what do you guys think? its def more than 80%

 

Its ok, its an 800k engine and your blo by reflcts that but its still acceptable

 

At least you now know your peak HP is from 55-58mph

 

That seems about normal you have at least 80% of your horsepower going to your wheels so thats a good start...but with that amount of miles I would change that bull gear just to be safe... Detroit recommends having it changed out every 750,000mi...

 

What rear ends again?

 

3:58 rear ends

 

3.3 inches (in H2O) is normal. I recall the last shop on my dyno run were saying that when you get up around 10-15 inches is when it's time for a rebuild.

 

If they did the run correctly, you will see the does because they ran it in 7 direct. True 1:1 out of the Trans. Direct gearing.

Everything else looks good to me.

 

I am not understanding your post?? What do you mean??

 

You peak is from 1300 -1700rpm when you read the sheet. Mean at 65 mph, you'll be in 13 @ about 1375-1400 rpm.