I finally listened to that old timer about injector timing

I used to always set injection timing by the book, dead on the spec. Then this guy Bill from a shop in Bakersfield told me to retard it 2 degrees for heavy towing in the heat. Tried it on a 1994 Cummins 12 valve last month and the EGTs dropped by almost 150 degrees. Anyone else run timing different than factory for specific loads?

3 comments

3 Comments

daniel_lane3017d ago

That Bill fella might be onto something honestly. What were your EGTs reading before and after? I gotta wonder if you noticed any change in the spool up time or low end grunt pulling a load up a grade. Retarding timing usually kills some bottom end torque (which matters for a daily driver but less for a dedicated tow rig). Did you have to bump the fuel screw a hair to make up for it? I'm curious if the tradeoff is worth it for the heat reduction if you're not constantly hammering on it in the desert.

the_cameron17d ago

Yeah @daniel_lane30 you nailed it. Low end grunt took a slight hit, but bumping the fuel screw half a turn brought it back fine.

graceblack1d ago

Throwing a little more fuel at it is probably the easiest bandaid fix.