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TechTalk · 03-28-2008, 05:03 AM

It is our understanding that DDEC upgrades, for example from DDEC to DDEC II, III, or IV, are simply not practical to retrofit. The DDEC system is integrated into the engine and, to a lesser extent, the transmission. There is a wide variety of significant differences in a number of parts, as well as the wiring harness, between these differing versions of DDEC. You may wish to talk with your nearest Detroit Diesel distributor about your specific situation, as they have greater expertise on this issue than we. But we don't think you can get there from here. A final comment: modifications to DDEC though the years have for the most part been for the purpose of meeting increasingly stringent exhaust emisssion standards. We would not expect to see any performance enhancements as a result of incorporating a later version of DDEC.

03-28-2008, 05:03 AM	#2
TechTalk Senior Member Join Date: Feb 2000 Posts: 304	It is our understanding that DDEC upgrades, for example from DDEC to DDEC II, III, or IV, are simply not practical to retrofit. The DDEC system is integrated into the engine and, to a lesser extent, the transmission. There is a wide variety of significant differences in a number of parts, as well as the wiring harness, between these differing versions of DDEC. You may wish to talk with your nearest Detroit Diesel distributor about your specific situation, as they have greater expertise on this issue than we. But we don't think you can get there from here. A final comment: modifications to DDEC though the years have for the most part been for the purpose of meeting increasingly stringent exhaust emisssion standards. We would not expect to see any performance enhancements as a result of incorporating a later version of DDEC. __________________ Hopefully this helps.