Got a Cat thread how about a Detroit thread.

I went to 89 thousants on both my 11.1 Detroits and could tell a lot of difference in low end torque. I couldn't tell much on my 12.7. It was a 1550 ft lb torque engine, so that may have been the difference.

I have been told not to drill above that, or the injectors have a chance of starving for fuel.

 

I have used .104 and .109 with good success. really you want 66 psi. so use a gauge and drill whats necessary to achieve this. DD14 has alot of exp with this.wonder where hes been ?

 

I agree with trying the humidity sensor first. the ambiant air temp could cause overfueling too since it probably fattens up the mixture. more fuel isn't bad depending on what you'r looking for, I'm looking fr fuel milage first and then worry about power.

Plus I live in southeast TX, all I need to do to check the humidty sensor is just go home.. lol

I must have missed that part as I don't recall reading it in the detroit manual

 

I got some information about what I need to do to modify the EGR circuit. Need to slder in a resistor. they gave me the resistance value to start out at but they didn't tell me if I should use 1/4 watt, 1/2 watt, 1 watt, etc resistors.

DOes anyone know? I'm thinking 1/4 watt is fine since the ecm runs on mili volts, or do the sensors run 12 volts?

 

Where in the egr circuit do you put it? what does it do when its in there?

 

just unplug it al!

somewhere in this section there are a few threads which mention the procedure, and no CEL or fault results from this.

 

that's for the ISX donk. the DDEC IV will immediatly derate if you try that. Detroit is much more difficult to deal with.


As I understand it the resistor causes the egr function t be reduced thus increasing fuel mileage and hopefully slowing down the EGR replacements.

I'l post more when I have some results

 

We used to call those old 12v71's "the buzzin dozen" back in the day.