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Bigjohn4300

Porch Pup
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About Bigjohn4300

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    Old Iron Expert

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    South Louisiana, USA

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    Mack construction trucks, B models, Mack pumpers

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  1. Ive got some questions, concerning the correlation between boost, egts, gear and load. The truck in question is a 2004 CV 713 with a AI300/Allison 4500/4.64 rears. We recently did the EGR cripple (E-Tech exhaust manifold/full 5 inch exhaust/427 hp injectors and S467 YTS turbo, Pyro and boost gauges. Im much happier with the power of the truck, especially the initial rollout from a dead stop. When she is loaded, I notice that when she hits top gear and speed levels out (60-65), the EGTs get up to 900ish @ 1400-1450 rpms. If I downshift a gear, rpm and boost both increase and EGTs go down to 700
  2. That is the number that i gave them, 419 M2 (400 hp), but apparently that number has been superseded, and they are saying they cant uprate it unless i buy the other number and install them first🙁. I hate to spend $1200 more and the time to change them, im going to try another dealer and see what they say, i think they are trying to sell injectors.
  3. She is going in soon to Capitol Mack to have the HP setting uprated, and i will ask them to turn off torque limiting if that can be done while programming (its a 4500 series allison, may have to stay on), correct speedometer error, and "allspeed" governor setting. My dealer is asking for what injector number i put in her, says Mack wont release the uprate file unless I put the correct injectors (it has K&S fuel reman 400 hp injectors). Funny they want to know which injectors, but not turbo. Seems like somewhere in this thread i saw something listing the different injectors and other parts
  4. Pressure checked from turbo discharge to the inlet of the intake manifold to 35psi, one minor leak in a hose coupling was replaced. Under full throttle(while actually pulling)she will put up 40-45 lbs boost(gauge flutters above 30ish psi) and pyro around 800. But when not pulling good(stealth mode i call it), she wont build more than 15-20 psi, 300ish pyro. Release throttle and floor it once or twice, most of the time it will apply fuel, and goes to pulling. She is still set at 300A hp, waiting on Capitol Mack to get approval for 375A uprate. Btw, I forgot to reply to the replies calling for a
  5. Thanks for the suggestions, the advice is appreciated! The truck is a 2004 CV with a fixed vane turbo, she is at 12B, the air cleaner shows good on the indicator at maintenance intervals(but it does move when reset indicating it isn’t stuck), ill ask my dealer about changing the governor setting to allspeed, and if he can find the referenced data file for the low power AI complaints. The truck is originally from up north, so corrosion on a connection or ground is a possibility, but we have checked them(the ones I know of) more than once, never found a bad actor.i would think that a bad connect
  6. No smoke, and quite, sounds like your barely on the throttle, in fact when she is about to start pulling, you can hear the engine tone get deep and louder before anything else, almost like starving for fuel
  7. Finished today installing manifold, GR 5”, yts 467 and 100hp injectors. It feels stronger sometimes, but the issue of low power for a while, then suddenly motor pitch changes, turbo spools lots higher and pretty good power thereafter is still there. Its random, sometimes great power in first gear, other times it may be weak for a few gears, then decide to make power. It seems to be related to throttle application, ie if its doing its “low power” thing, a rapid release and reapplication of throttle once or twice MAY bring in the power, but sometimes not. We changed the accelerator early in our
  8. Finished today installing manifold, GR 5”, yts 467 and 100hp injectors. It feels stronger sometimes, but the issue of low power for a while, then suddenly motor pitch changes, turbo spools lots higher and pretty good power thereafter is still there. Its random, sometimes great power in first gear, other times it may be weak for a few gears, then decide to make power. It seems to be related to throttle application, ie if its doing its “low power” thing, a rapid release and reapplication of throttle once or twice MAY bring in the power, but sometimes not. We changed the accelerator early in our
  9. Ok thanks! Late this afternoon we had a line made for it. Much appreciated
  10. I have a 04 Granite, AI300, allison 4500 with 4.64 gears, 17 yard dump. Working in the plants they will load her to 60-65k with 610 limestone, and other than the “AI lag” that we may have cured this weekend, the 300 handles it fine, even up the ramps. When tagging my excavator im at 82k, and the 300 could use a little more muscle, but gets it done. We changed turbo and injectors this weekend, we will see next week how she does.
  11. I ordered a used jake brake setup to replace my current (parts missing since I purchased the truck) brake from Manders. Was buttoning everything up from manifold/exhaust/injectors change to cripple egr, and noticed that one of the internal oil lines in the jake was broken, looks like from shipping (broke at the check valve). We put a plug in the oil port and started it, but were scared to run it long like this not knowing if something was starving for oil, or does it only work the jake. I figure with MLK day tomorrow chances of getting one is low. Does anyone know for certain if it would or wo
  12. Singlestack! Did you ever figure out the intermittent low power issue? Im having the same issues, may pull good , then reduction of boost(almost like derating), then comes back. Sometimes i can lift off throttle, and get back on it and power resumes, or may have to do it multiple times, or just ride it out. (225)266-6350 talk/text
  13. Can you still get the AMI 370 file? I thought I read it was no longer available.
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