Mackpro Posted February 14, 2023 Share Posted February 14, 2023 Your definitely on the low side of specs on boost pressure. Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-525337 Share on other sites More sharing options...
Bluebulldog Posted February 14, 2023 Author Share Posted February 14, 2023 1500 is 65mph. But you better have a tail wind or down hill when you’re loaded if you’re going to worry about 65😬 Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-525348 Share on other sites More sharing options...
880joe Posted February 14, 2023 Share Posted February 14, 2023 I can get 38 out of my 355/380 Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-525351 Share on other sites More sharing options...
Jody Scott Posted September 24 Share Posted September 24 On 2/9/2023 at 6:42 AM, Mackpro said: What the model and last 6 of the VIn? I can look the actual specs up of your truck/engine. The 355/380 has the same torque as a 427. On some year models of the 355/380 just adding the 427/460 injectors ( possibly turbo as well) will boost the Hp over 500. The 355/380 usually have smaller injectors but the software/data file manipulates the EUP’s for a larger fuel charge to get the 427 like torque readings. Bumping up to the larger 427/460 injectors really improve things. I have to find my notes on this when I get to work. I read on here someplace that if you up the program to a 380/410 hp and increase the injector size it will really improve the performance. Have you come across a combination like that before? Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-559003 Share on other sites More sharing options...
880joe Posted September 27 Share Posted September 27 The 380/410 program came on newer trucks than I'm running so I don't have any experience with it but the bigger injectors livened up the early etech My guess is they would help the newer one's also 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-559078 Share on other sites More sharing options...
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