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, 2024 Share Posted September 24, 2024 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, 2024 Share Posted September 27, 2024 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...
Jody Scott Posted Monday at 01:03 PM Share Posted Monday at 01:03 PM What injectors did you change up to? Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571045 Share on other sites More sharing options...
880joe Posted Monday at 06:57 PM Share Posted Monday at 06:57 PM I have used them from K&S Diesel,Antrim,and Rochester now I'm running factory mack 460 injectors Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571065 Share on other sites More sharing options...
Jody Scott Posted Monday at 07:16 PM Share Posted Monday at 07:16 PM How do you like the stock 460 injectors? Do they smoke a lot? Do you have temp problems? Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571069 Share on other sites More sharing options...
Joey Mack Posted Monday at 10:39 PM Share Posted Monday at 10:39 PM You need to put an E-7 or E-Tech exh manifold on it,... some guys here say turbo swap, but i wouldn't do that at first. 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571073 Share on other sites More sharing options...
Jody Scott Posted yesterday at 05:05 AM Share Posted yesterday at 05:05 AM My truck was built in September of 2001, was the exhaust manifold a problem that year? Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571111 Share on other sites More sharing options...
Joey Mack Posted yesterday at 09:33 AM Share Posted yesterday at 09:33 AM No. Its the newer ones, your good 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571112 Share on other sites More sharing options...
880joe Posted yesterday at 12:20 PM Share Posted yesterday at 12:20 PM Smokes some when you shift gears then clears up. No heat issues Probably the best combination to use for every day reliability but If your looking for alot more power and want to play one of the aftermarket is the way to go 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571115 Share on other sites More sharing options...
Jody Scott Posted yesterday at 01:20 PM Share Posted yesterday at 01:20 PM Just looking to improve the performance a little bit and not burn things down or blast the innocent with obnoxious smoke. Did you change the turbo and the exhaust manifold? Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571121 Share on other sites More sharing options...
Jody Scott Posted yesterday at 01:40 PM Share Posted yesterday at 01:40 PM some guys here say turbo swap, but i wouldn't do that at first. You believe that a larger injector without a turbo swap will work good enough? The boys at my Mack dealer here in Phoenix want me to switch the turbo to a #631GC5153M4 but Mack Corp will not get back to them with the horse power increase file. I know I am playing with old toys but still. Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571124 Share on other sites More sharing options...
Joseph Cummings Posted yesterday at 02:27 PM Share Posted yesterday at 02:27 PM Turbo is worthless without fuel. I'm always amazed how many "mechanics" don't understand how a diesel engine works 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571136 Share on other sites More sharing options...
880joe Posted yesterday at 02:45 PM Share Posted yesterday at 02:45 PM I think I'm running a 631gc5173 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571138 Share on other sites More sharing options...
Jody Scott Posted yesterday at 03:12 PM Share Posted yesterday at 03:12 PM I guess it would be a good idea to let you guys know what I am trying to accomplish with this truck and the story behind it so you don’t think that I am completely off my nut. I traded a farm tractor for this truck a little over a year ago, not one of my better deals but I did it so I get to live with it. The truck was a Texas oilfield truck just plain Jane no exhaust brake, one horn, and nothing fancy but that is what I wanted. It is a Maxicruse 355/380 and I am here to tell you driving this thing home was nothing to brag about, what a DOG!!! The front right tire shredded just outside of El Paso took out the right headlight and part of the hood, that cost $1000.00 for the tire and the roadside rescue, and it caught on fire before I made it home. I have been to the school of hard knocks before so I know the address by heart but I also know the recipe of how to make lemonade from lemons. I have it I own it now what do I do with it? Fix the hood - DONE Fix the tires - DONE Fix the wires from the fire - WORKING ON IT Fix the lights - ALMOST DONE Fix the exhaust - WORKING ON IT Fix the HORSEPOWER issue - WORKING ON IT WITH YOU HELP My plan as of today is to increase the horsepower file to a 380/410 with a slightly larger injector, maybe something in between the 700cc it has now and the 850cc of the E7 460 if possible. I am not even sure if a 380/ 410 file is available for this year of truck at the moment because Mack Corporate has not gotten back on this as of yet. I am relying heavily on the information that I am getting on this forum in my decisions and I appreciate your assistance. I am also toying with the idea of installing the Power Leash engine brake but I am being told that it will not work on this engine, not sure or understand why though. Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571139 Share on other sites More sharing options...
Joey Mack Posted yesterday at 03:57 PM Share Posted yesterday at 03:57 PM If there was a way to check the camshaft part number in yours against an ASET-I engine, that would be some useful info, also is yours a CCRS engine, if it early E-Tech the cam key may be wrong.ibwish i knew more on this 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571144 Share on other sites More sharing options...
880joe Posted 14 hours ago Share Posted 14 hours ago I'm going to say that the 380\410 file isn't available for your engine as it didn't come out till the acet series. I'd say put a turbo on it and some bigger injectors and it should perform pretty good for a 12 liter engine. Don't try and compare it to a 15 liter cat or Cummins 1 1 Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571180 Share on other sites More sharing options...
Jody Scott Posted 11 hours ago Share Posted 11 hours ago You are probably right on the 380/410 file. Quote Link to comment https://www.bigmacktrucks.com/topic/72487-355-380-horsepower-increase/page/2/#findComment-571183 Share on other sites More sharing options...
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