What's this I hear about "throttle plates" on Powerstrokes and Duramaxes?

What do they do?

 

You mean like a restrictor plate? to limit the amount of airflow? I dunno man.. I dont know anything about that for the DMAX...

 

there on the newer emmisions models for regen to help burn off the soot. cummins got them too iirc

 

how new are we talking ... jw

 

lmm, 6.4 stroker and 6.7cummins

 

So how do they work?

They limit the air supply to make the mixture richer... That causes higher EGT's?

 

something like that, they gotta get the egt's up to 1100 before and after the dpf to burn all the soot off

 

Wouldn't you want to keep as much air in the mixture as possible, and then just inject fuel on the exhaust stroke?

How does limiting air to the mixture make things burn hotter? Traditional reasoning says that lean mixtures burn hotter.

 

same effect as a dirty filter. lean = hotter on gassers. cooler for diesels