Join Date: Dec 2008
Location: Tyler, TX
Thanked 407 Times in 347 Posts
You are 100% correct, the "extra" fuel for active regeneration IS injected near the end of the exhaust stroke by the regular old fuel injector in the cyliner(s).
You are also mostly correct in the EGT question. Every OE measures EGT POST-TURBO, and 1250*F is about the upper limit for any length of time. Now, as you get further down stream from the exhaust valve, the EGTs drop dramatically. So, the EGTs pre-turbo will always be somewhat hotter than post-turbo.
That is not to say that 1250*F is acceptable on older engines (pre-turbo) as materials and manufacturing methods have made modern turbos MUCH more durable than those of a years ago.
'93 F-250 HD, 7.3L IDI, 5spd - FARM TRUCK
I Support: Trailer brakes an every axle over the towing vehicle's GVW; CDLs for RVers; Safety inspections for ALL vehicles and 6 axle trucks (97K GVW proposal).
Democracy is two wolves and a lamb voting on what to have for lunch. Liberty is a well-armed lamb contesting the vote - Benjamin Franklin
I vote for LIBERTY!