Getting ready to BOMB

[jbolt]

OK Guy’s I’m getting closer to talking myself into installing my stuff and tweaking the pump but I need a little hand holding. I have decided to go ahead and do this before I get the transmission work done to see if I’m happy with it. If I feel it is too hard on the transmission I will take it back to stock until I get the work done.



I installed the BHAF a couple of days ago and have been watching the gauges. My EGT’s dropped 75* at 70mph cruising no load and 100* WOT. Boost at both these is down 1. 5lbs. Does that sound right?



The next item will be the turbo housing. I don’t want to do any changes to the pump until I change out the injectors. I take it this is okay. Let me know if anyone thinks otherwise.



Now when I change the injectors I’m thinking it would be best to change them and drive it around a little bit to make sure it is running smoothly before jumping into the pump. Does this sound right?



Having done the above what is the best way to proceed with the pump? What would you guys recommend as the initial settings? Do I make one adjustment at a time? What order should I do these in? Has anyone taken pictures detailing these procedures? Any tips to make things go as smooth as possible?



List of pump tweaks.



1. Smoke screw

2. Eccentric pin

3. Star wheel

4. Power screw

5. Engine timing

6. ???



I read somewhere there is a nylon stop under the eccentric pin that can be shaved down to allow more travel. Should I consider this or wait until I have gone through the initial steps and fine adjustments.



Can the engine timing be set with a standard dial indicator on a magnetic base or is a special indicator needed?



Anything I've missed?

 

[formula]

I'm a little puzzled by the decreased boost. EGT reduction is good though.

Sounds like you've got a good plan. Get that turbine housing on before you do the injectors. No need to tweak the pump right away after the injector change. Drive it around and take note of all the changes. One thing at a time is really the best thing to do and you'll learn more by taking your time.



Sean

 

[formula]

Check this link for pump tweaking instructions:

http://www.dodgeram.org/tech/dsl/more_power/Power_ve.htm



And BushWakr has some great pump pictures in his gallery here: https://www.turbodieselregister.com/user_gallery/displaygallery.php?userid=5168



As far as the timing goes, check this out for some options:https://www.turbodieselregister.com/forums/showthread.php?threadid=60101



Sean

 

[jbolt]

Hey Sean thanks for the links. I had them printed already





I guess where my concerns are is that in stock form the engine, pump & PCM have been balanced somewhere between acceptable performance and emmisions. So this leads to several questions.



1. What effect do these changes have on engine timing?

2. Do the larger injectors advance or retard the timing?

3. By changing the throttle govenor range to 2900 or so do I need to adjust the TPS?

4. Do these changes have any effect on the input to the PCM?

5. How about the transmission shift points?



Jay

 

[formula]

Ah, let me see... ...

The only thing that you're going to change that will have an effect on the timing is the injectors. The bigger injectors will produce more smoke and raise your EGTs and boost, assuming you don't adjust the timing. If you advance the timing, you will see less smoke, lower EGTs a bit less boost, and better mileage. The reasons for this are the bigger injectors are not quite as efficient at atomizing the fuel as the smaller factory injectors and they inject more fuel at a faster rate. To maximize the benefits you must advance the timing.



If you up your high idle setting, you may need to adjust your TPS. You'll just have to try it and see what happens. The TPS will probably not cut you any slack either.



Trans shift points: the 1-2-3 shifts are done by the valve body and the 3-4 shift is done by the PCM. The PCM will alter the 3-4 shift based on throttle position, trans temp, engine temp and vehicle speed.



Sean