Twin cp3 question
- Thread starter 2005LLY
- Start date
Yes.depending on your tune you will not have to command as much fuel/pressure. The fuel is going to come on harder and faster.
Shouldn't the pressure be commanded the same by the ecm? The two pumps just work at half effort by way of the dual cp3 electronic module?
yes.
you shouldnt need to retune. just because your adding a second pump doesnt mean your flowing twice as much to your injectors. just means you have the ability to when needed (if you upgrade to bigger injectors/higher pulse width) the ecm will still command the same, like stated above. your pumps will just be working half as much as before since you have two doing the job of one. same goes with three pumps.
Max effort tune is a relative term. It depends on the Pw. Maybe your Max effort was 2500 Pw so now you could support more Pw and hold pressure. So none of us could give you the right answer without knowledge of your tune.
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On a max effort tune you may not be getting what is commanded. After the dual fueler install you will. I would talk to the person that tuned your truck, he may want to make you a more conservative tune that will still out perform the old one and be safer.
This. If it is like a lot of the 525 HP max effort tunes the tuner is balancing PW with rail PSI, you throw that pump on there and now the rail is higher than the tune was written for. Even though it always commanded 26K the tuner does not expect to get that WOT and writes the tunes that way. At least from what I have seen.
Your correct, the tuner installs a tune, logs the truck and increases pulse until actual preasure starts do drop or something like that. If my truck actually achieved what was comanded I'd probably need an engine by now.
I Agree 100%. you can blow your chit up.
http://www.duramaxdiesels.com/forum/showthread.php?t=32921&highlight=tuning+cp3
http://www.duramaxdiesels.com/forum/showthread.php?t=21222&highlight=tuning+cp3
ok now I understand the idea of needing a retune for duel pumps because of the max effort tune, but
I've got my duel fueler kit waiting to go on, was waiting until I could get it retuned. Lets say for arguement sake, coud I install my 2nd pump and just not turn my dsp5 all the way, just run it on the "stock" or like 100+ setting. would that be safe?
In theory, the way my brain is thinking, the tune for the lower hp, not a max effort tune, wouldnt be draining the rail, so I shouldnt have a problem with all the extra pressure the second pump gave me, no?
I've got my duel fueler kit waiting to go on, was waiting until I could get it retuned. Lets say for arguement sake, coud I install my 2nd pump and just not turn my dsp5 all the way, just run it on the "stock" or like 100+ setting. would that be safe?
In theory, the way my brain is thinking, the tune for the lower hp, not a max effort tune, wouldnt be draining the rail, so I shouldnt have a problem with all the extra pressure the second pump gave me, no?
adding the other pump isnt going to magically give you engine killing power. The reason people say dual fuelers kill motors is because you can now get all the fuel you are asking for. Example, say your truck makes 580hp on a 2900uS tune. But that same tune drained the rails down to 19,000 psi. Throw the dual fuelers on and now you have 26,000psi of rail pressure on the same tune and more hp. technically you are now getting more fuel in the cylinder than before, but thats not because the ecm is calling for more fuel, you are just getting all the fuel that is commanded.
On a stock/100hp tune you wont see a difference in power assuming your stock.100hp tune doesnt currently drain your rails
On a stock/100hp tune you wont see a difference in power assuming your stock.100hp tune doesnt currently drain your rails
ok thats what i thought. think before I attempt the duel pump install I will do some logging of my rail pressure
Whats the install like in the duel fueler kit? Looks pretty straight forward and pretty simple to me