You could have a second cummins motor turning a 150 gallon a second lift pump and it would still not fix the "dry rail sydrome" when a OEM CP3 is in the way. The shift pop is more like a bark...that is coming from the turbo...but the other "pop corn" pops is a dry rail. Dyno or go drag with a DRB plugged in to check your rail pressure...I bet you are dipping below 15000 psi at the pop...probably closer to 12,000 psi. That is where your dyno curve will drop for a bit till the CP3 sort of catches up...and the pop occurs.

I want a hot CP3 so bad....

 

You've got a great idea there with the DRB ride n' drive. I wonder if my dealer would mind riding shotgun while I blow it down the strip. I can just see that guys face. Something like that,...I bet.

 

Several options on rail pressure gauges there is the SPA TDR one or Quad when he comes out with his commander gauge soon. There are two supply problems the CP3 running dry and the rail running dry. If fuel pressure on the low side drops below 6psi you are starving the CP3 and will get a fluttering sound at WOT with high fueling. If the CP3 is getting 40psi and the rail drops below 15k at WOT you will get popcorning. The TST seems to cause more popping stacked than say a CLDL and a QuadRace or Ramifier without the TST. TST makes the cooler lower max pressure power when all is matched. A TST alone with bigger injectors needs a modded CP3 to get maximum power. ks

 

I have the popping/backfire also. I only have the TST origional programing. It has happened to me in various situations, but most common for me is around 1700-1800rpm and aroound 8-10 lbs boost. It happens often for me, but hard to pinpoint something. I have a hard time believing I am pulling my rail dry at the above specs.

It is a definate miss/backfire, sometimes VERY loud and will cause the truck to move. Like you just tap the brakes very quickly. I still need to call mark about it.

 

Yep,..that's it, only mine happens at higher rpm with the Big Bang and popcorn-like at lower rpms as speed is building. Just a guess and something for you to try,..with yours being just with the TST and not stacked, then I'd find a buddy and and swap the timing harness and try it and then try the injector harness and try that. Those harnesses are around $70 per copy so that would be a cheap way to eliminate something or possibly resolve your problem. Just a thought and starting point.

 

OT--- You have the same problem as me... The 3-4 shift is a huge load point, and you are definitely draining the rail. Mine does the same thing with the nitrous on, due to more air than fuel. (N20 acts as extra air in a diesel) The modded Cp3 will fix all your problems. I'm trying to get one now, my injectors/TST/CLDL/EZ is a HUGE rail drainer. Your FASS 150 is plenty for your setup right now, it's just the CP3 is lacking. Mine will do it if I turn the TST any past 2/5 with my current setup, and I have to turn that down more with Nitrous.

 

I am not sure the popping has to do with a drained rail. I have a modded cp3 and get the popping noise in upper rpms on any setting of the TST when it is stacked with the BDDL. I have the BDDL on the 90hp setting, and if I turn the TST to 0/0 the popping goes away. Even with the tst on 1/1 (timing only) I get the popping back. I think it has more to do with too much timing, but I am going to have to try the tow setting and stock setting to verify that.

 

Jeff,

Did you have this situation b-4 you put on the twins? I didn't and that's why I think Mark Chappel's assesment is most probably the right one.

 

I didn't have the popping before the twins, but I also did most of my testing with the original TST program and BDDL stack. I have added so much since that time (TST twins program, injectors, CP3, cam, twins, intercooler/high ram...) that it is tough to tell when the popping actually started. Mark's theory about air going backwards may be true when the tranny is shifting, but I notice my "popcorn" popping under constant load and in the upper rpm range (2500+). I guess I am going to have to start playing with stacks again to find one that works properly

 

If it's the rail running dry, I just don't see how. I had 23 and 24K of pressure when mine was popping. Mine never did it with the twins either. My problem only started when I did injectors. For now I went back to stockers for the time being to see if I can get rid of the problem

 

I don't see it being too much timing. I'm running the CLDL and TST early twins program... You don't get more timing than that. I run the TST on 3/5 up to 5/5 with the CLDL loaded.

 

I used to run mine up to level 4 and 5 every other day at least with the CLDL and TST stacked. I never had the pop till I did injectors. After injectors, as soon as I put the TST on level 1 it popped when I had crazy larry loaded

 

Hmmmm, that is not what I wanted to hear! I really like the new injectors, but if I can't get the popping to go away, I may have to look at something else

 

All Charge air coolers have an efficiency map just like turbos. Most are designed to be at peak efficiency with the stock turbo they were intended for. While the turbos don't pop at 100psi....it doesn't mean that the restriction they impose on the airflow doesn't get worse with the higher pressure. The higher the pressure the less time each air molecule has exposure to the cooling effect of the heat exchanger. I'm looking at running a bypass to the intercooler in my Twins and super single setup. The bypass would use water intercooling and would keep the intercooler within its pressure efficiency map. I know it works, I don't know that it would solve your problems but I know it definitely wouldn't hurt. We are starting this project next week in preparation for the "week of twins". If it works, It may be a good "product" to market to the "enthusiast". ks

 

ABC4YEW let us know how that cooler thingy works out for you. Also you guys running the CLDL and the TST,... You aren't seriously running that CLDL on the Extreme setting are you when stacked??