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Messages posted by: GreenDieselEngineering
Forum Index » Profile for GreenDieselEngineering » Messages posted by GreenDieselEngineering
Those are some good numbers with the tires you are rolling on! A little brake torque makes for an agressive launch. Don't post this tank's fuel economy numbers...you'll make us look bad! ha ha
"Destructive" testing on a KJ CRD:

1. Increasing the engine output torque to find "shudder" with stock torque converter. Then backing off on allowable torque for customer vehicles to prevent shudder. The original TCs on our vehicles had a rough life and were in dire need of the Mopar TC upgrade.

2. Pulling a 7000lb trailer around to validate acceleration ability and being able to hold a steady-state speed on the highway. Not so destructive, but not good for suspension life and very hard on u-joints.

3. Repeating 0-60 performance runs until brake fade was very apparent. Warped a few rotors in the process!

4. Off-road validation caused a major issue with one KJ being stuck overnight in a river. We needed a track loader to drag it out. The sand bar wreaked havoc on the u-joints, front axle pinion seal, and another brake job.

5. We found that the front bumper assembly is mostly held on with little plastic push in fasteners...these readily fail if the nose of the vehicle comes down too hard after a small jump.

6. The CAC hoses are weakened by oil seepage and pop like popcorn with the stage II turbo kit. The Samcos fixed this failure mode.

Both vehicles are still going strong despite our best efforts. We will have these in our arsenal for a long time coming!
We concur with flman, there is no need for the provent or EHM with the tune. The intake may not fully self clean over time, but the build-up will stop occurring. Oil going through the engine is not a problem. You need to be aware that the oil will still bleed through the CAC hoses and weaken them over time. We would recommend the Samcos as a good fix due to the silicon lining so the oil does not bleed through.
The stock tune does open the turbo vanes in fast tip-out situations to protect the turbo. We modified the stock settings to make the response quicker and to allow the turbo to build boost back to the desired level faster after the tip-out event when the accel pedal is pushed again. It is safe to unplug the MAF sensor and it should slightly improve your fuel economy. The main issue is that your check engine light will always be on and if you have a real problem you will no know and engine damage could occur. We think it best to make sure the CEL is off normally and only comes on when a real problem is present.
The BCM is a separate module and will not effect the tune.
The release date for the turbo kit is still on track, incidentally our long lead item is a little plastic connector. There are still units available. The kit will not come with the ECO tune or HOT tune, a special tune is needed for the kit in order to power the new turbo. If you get the turbo kit, the stock ECU is useless unless you want to drive with the engine acting as if it was naturally aspirated. We can always work out something with ECU shipping to keep your downtime to a minimum.

For those interested in the turbo kit, we can do installations for customers if you want to drive-in for a day. The installation should not take more than 5-6 hours. In this manner there is no need to ship anything and we would be able to give some price concessions.

At this time, we do not have any un-neutered TCMs available...but we are always on the look-out just in case! The Mopar "Euro" TC is holding up great in both our vehicles. It has been a major step in the right direction.


If you are able to get the new Mopar TC under warranty...that would set you up for the next several years. Being able to demonstrate shudder to a dealer should be enough to warrant a replacement. A little preventative maintenance on the TC will save the transmission in the long run. Ours are still going strong after 20,000 miles on two different KJs and we tend to be very destructive on our cars. The way we look at it, if it does not fail while we are testing it, chances are it will not fail on someone who actually treats their vehicle nice. Call us the 99th percentile driver...
It will only jump the first cold start of the day. When the engine is warm, there is no jump. Did you have a recent trip to the dealer?

Thanks for sending the check back. We were in such a rush to get your ECU back...must have overlooked the whole payment thing!
The CAC hose going to the engine inlet did not have any issues with rubbing other parts. We reused the clamps when upgrading to the Samcos. As long as nothing is rubbing the Samco hoses, they should last for a long time.

Do you remember what the vehicle was averaging prior to the tune in both summer and winter? The mpg you are achieving now is very good...almost double what a gas KJ will achieve!



Thanks for posting your vehicle information. The results you are achieving are fantastic and the information is very detailed relating to driving conditions, speeds, and vehicle configuration.

We would appreciate any feedback from customers that have been tracking their fuel economy during the last few month. Before tune numbers and after tune numbers along with driving conditions would be fantastic. Some customers have noticed the annual drop in fuel economy with the winter season. This is due mainly to the fuel blending of diesel and partially due to colder ambient temps. A 10% drop is fairly typical going from summer to winter.



Since you were an early adopter having an updated tune will add some features anyway. You may be better off just sending it to us for the update and we can program the new injector code for you at the same time. The cost for this would be $30 to cover the shipping of returning the ECU to you.

If you go to the dealer, they should only change the injector code and not update your entire ECU code. However, we did not record the firmware versions of the ECU for the first few buyers and we do not know yours. If the firmware is early, the dealer is instructed to update it as standard protocol.


We will keep you posted when we receive the module, we'll also let you know whether or not the ECU was actually reflashed or not.
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