ORM Mod circuit

kccrd · **Joined:** Thu Mar 08, 2007 10:35 pm **Posts:** 267

This is my second day with all three unplugged and what a difference when I went to pass a semi on a 2 lane kansas highway it only took about 4 to 5 seconds much better performance there is a much better throttle response. And the egr plug is a little bit difficult to get unplugged but you just have to work with it and it will come loose.

KJMedic · **Posted:** Thu May 31, 2007 7:07 pm

I will try to unplug the other two befor I leave work and see if my scangauge will clear the codes and keep the light off on the way home (62 miles) I will let you all know in the morning.

KJMedic · **Posted:** Thu May 31, 2007 8:33 pm

OK whats the secret to unpluging the FCV? I tried and could not get it unplugged?

bbertram · **Joined:** Mon Dec 19, 2005 4:17 pm **Posts:** 144

kccrd wrote:

This is my second day with all three unplugged and what a difference when I went to pass a semi on a 2 lane kansas highway it only took about 4 to 5 seconds much better performance there is a much better throttle response. And the egr plug is a little bit difficult to get unplugged but you just have to work with it and it will come loose.

Mine was difficult to get loose too, or so I though. I took a flat screwdriver and put it at the base of the plug on one side, gave it a twist, the plug moved up on that side, move the screwdriver over to the other side, twist and pop she came off, woot. Rhe AFC plug was weird, it to popped off with the screwdriver but in that process I found how it really comes off. The AFC plug is attached to the motor, you must slid it forward (to rad) and then it will pop off. Then you can disconnect it.

Turbo Tim · **Posted:** Thu May 31, 2007 10:25 pm

I think the reason I felt a difference with the "Butt-O-Meter" is even though the MAF is disconnected, is because the CPU is sending a minum pulse to both (EGR & AFC). I think this minimum pulse is just enough to lift or just hold the valve on the seat, or get it ready to move when the CPU says jump. Same for the AFC valve, just getting it ready to flap or just float off the stop.
Whatever is going on, I did notice a difference on my 2005 CRD with all three disconnected. Maybe there is just enough manufacturing tolerances where some may see a difference, and some may not. This is why I need your input so we are not fooling ourselves.

bbertram · **Joined:** Mon Dec 19, 2005 4:17 pm **Posts:** 144

I wish someone here with a CRD had access to a dyno and could dyno each mod. I would love to see the results.

kccrd · **Joined:** Thu Mar 08, 2007 10:35 pm **Posts:** 267

I have a tuner shop about 2 blocks from my house I will try to go up there this weekend and see if they will dyno my crd with all the connections plugged in like stock configuration and then check it one at a time dissconected and see what the change is. These guys will plug in a computer to see where the torque curve is and what the change is when each plug is unhooked. It will be fun to see what the difference is I bet there is at least a 5 to 10 percent difference in the horsepower. It sure feels like a pretty good gain from the seat of my pants anyway. Hope the numbers prove us all right.

Pablo · **Joined:** Thu Feb 02, 2006 10:06 pm **Posts:** 1201

kccrd wrote:

I have a tuner shop about 2 blocks from my house I will try to go up there this weekend and see if they will dyno my crd with all the connections plugged in like stock configuration and then check it one at a time dissconected and see what the change is. These guys will plug in a computer to see where the torque curve is and what the change is when each plug is unhooked. It will be fun to see what the difference is I bet there is at least a 5 to 10 percent difference in the horsepower. It sure feels like a pretty good gain from the seat of my pants anyway. Hope the numbers prove us all right.

Awesome. On a related note, is it possible to rig up something to make the FCV come on when we want it to? I would like to use it as an engine brake. I am not sure if the stock programming does this, but the motor seems to slow down a bit when you downshift and go downhill... at least better than other diesels I have driven. At any rate, this would be a cool feature and worth leaving the FCV hooked up for, as for the EGR-- good riddance.

stevesmith7 · **Posted:** Fri Jun 01, 2007 8:03 am

kccrd wrote:

I have a tuner shop about 2 blocks from my house I will try to go up there this weekend and see if they will dyno my crd with all the connections plugged in like stock configuration and then check it one at a time dissconected and see what the change is. These guys will plug in a computer to see where the torque curve is and what the change is when each plug is unhooked. It will be fun to see what the difference is I bet there is at least a 5 to 10 percent difference in the horsepower. It sure feels like a pretty good gain from the seat of my pants anyway. Hope the numbers prove us all right.

Someone on this board tried to dyno a CRD and found the intercooler heating had more influence on power than the changes he was trying to measure. Do a search.

Steve

Jeger · **Posted:** Fri Jun 01, 2007 8:35 am

stevesmith7 wrote:

Someone on this board tried to dyno a CRD and found the intercooler heating had more influence on power than the changes he was trying to measure. Do a search.

Steve

Didnt they put one of those big fans in front of it for the test? You would have to provide some airflow....especially for an intercooled engine.

KJMedic · **Posted:** Fri Jun 01, 2007 8:49 am

how do I unplug the EGR? I have the FCV unpluged and the ORM, and Fuel Heater done already?

bbertram · **Joined:** Mon Dec 19, 2005 4:17 pm **Posts:** 144

KJMedic wrote:

how do I unplug the EGR? I have the FCV unpluged and the ORM, and Fuel Heater done already?

From one of my previous posts, it might help, it might not, lol.

Mine was difficult to get loose too, or so I though. I took a flat screwdriver and put it at the base of the plug on one side, gave it a twist, the plug moved up on that side, move the screwdriver over to the other side, twist and pop she came off, woot

KJMedic · **Posted:** Fri Jun 01, 2007 9:25 am

I can find the EGR but can't get my hand or screw driver to the plug. If I am tring to unplug the right thing. It is under the FCV, right? :?:

Turbo Tim · **Posted:** Fri Jun 01, 2007 11:08 am

Yes, the EGR plug is underneath the FCV valve. If someone here can post a picture, I can email them the diagram from the shop manual to post for all to see. I don't have a place on the net to post pictures.

As far as using the FCV valve to act as a brake, I believe that your on the wrong end of the horse. Every engine brake setup I have seen on a diesel has been on the exhaust side. Closing off the air into the engine would cause it to run in a vacuum. I don't see how that would help brake. On the exhaust side however, by closing off the escape route, then the compression would offer resistance and would slow you down.

By using the signals from the transmission it is very easy to have the FCV valve be switched back in before shutdown. This signal would make it active only when in park. Easy to do, but first, back to the circuit.......

KJMedic · **Posted:** Fri Jun 01, 2007 11:27 am

Here is the picture:

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KJMedic · **Posted:** Fri Jun 01, 2007 11:31 am

And I still can't get my hand on the plug to unplug the EGR valve. :evil:

. I got the FCV unpluged.

weantright · **Posted:** Fri Jun 01, 2007 11:33 am

Understanding correctly, disconnect # 3 and # 5 at the item. Later in the future a mod box circuit will be available that needs to be cut into harness to control these items without a code thrown. Right path??

bbertram · **Joined:** Mon Dec 19, 2005 4:17 pm **Posts:** 144

Hmmm........maybe I unplugged something I shouldn't have? I'm getting 6 codes throw at me now. I can't post them or any results right now, at work.

chadhargis · **Posted:** Fri Jun 01, 2007 12:06 pm

Ok...I need some more info before I go unplugging things.

It was determined that unplugging the MAF sensor disabled the EGR and FCV....all well and good. Mileage improved, power improved, we acheived world peace, etc.

Now, it has been determined that we need to unplug the EGR and FCV, which supposedly are non-functional due to the MAF being unplugged.

Is the EGR and FCV still functioning with the MAF unplugged, just in a reduced capacity? Is this the reasoning for unplugging them?

Stan Wright · **Posted:** Fri Jun 01, 2007 1:30 pm

KJMedic - If you look between the motor and the intake hose (directly behind the flow control valve) you can see the connector. I was able to stick a long, skinny screwdriver down through there and finally pop the thing loose. It's a pain otherwise.

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