Quote:
Originally Posted by Ram12vcummins
I read this was a big issue. Was assured by the guy who removed diesel spec tune that his was a proper one and a few people vouched....not that it means they are right. The mechanic took the egr plug apart and ground out the contacts for some stupid reason instaead of just taping up the ends. I guess to look stock. The tuner assured he can tune it either way. I can try and see if we can go about trying out the factory tune. But how would that act with the egr deleted? I would also have to rejoin the wires which isn’t that big of a deal.
I don’t understand how an ecm being bolted to a head causes this issue? Does the ecm seal off the intake?
As I understand the guys who tune these improperly advance the timing to hide lose of power?
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if they did it right, there would be no need to unplug the EGR, it should be done inside the software, just set EGR solenoid PWM to zero. I have heard many problems eith EGR deletes, one is that VGT control will close VGT completely and cause very high turbo speed and backpressure, turbo rpm control will limit overspeed. That is what PDI did and their solution was to raise turbo RPM limit which resulted in turbo explosion. They told customers that those VGT Holsets are just crap and they must buy their VGT delete kit.
Another problem after EGR delete is that ECM still tries to control NOx by retarding timing, that causes high EGT and high fuel consumption and possibly low power.
Needs a good tuner to realize and solve these problems but those tuners are very hard to find, most just wants your money and most get away with it because their customers dont understand engines.
I am not sure but I also believe that Cummins HPI system is not understood by tuners, it's like old PT system that most of the "gurus" dont understand even if they write articles about it for some magazines. Scania used same system in some of their engines and many of them failed after ECM tuning. I believe timing is overadvanced without them knowing when they add fuel to it.