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  1. #131
    Bobtail Member
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    I have read your post about the ProStar with a Maxxforce engine, and the only reply that I can think of is that it is spec'd out wrong. The Maxxforce 13 475hp engine with the right gear ratio WILL pull just as good as any Cummins, Cat, or Detroit! I have sold several of these trucks with the MaxxForce 13... granted I spec'd the first one out with the wrong gear ratio and it did not pull as well, but the rest have been great... and these are coming from Peterbilt guys! You cannot use the same old gear ratios that the older engines use to achieve power, these are different engines. You have also attacked the interior of the Prostar... this is the most comfortable and best riding truck ever made! I realize I sell International for a living, but I have driven everything and nothing is a nice or comfortable as this truck... nothing, and this is even coming from Pete guys who wouldn't drive anything but a hood!


  2. #132
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    Quote Originally Posted by Salesman258 View Post
    I have read your post about the ProStar with a Maxxforce engine, and the only reply that I can think of is that it is spec'd out wrong. The Maxxforce 13 475hp engine with the right gear ratio WILL pull just as good as any Cummins, Cat, or Detroit! I have sold several of these trucks with the MaxxForce 13... granted I spec'd the first one out with the wrong gear ratio and it did not pull as well, but the rest have been great... and these are coming from Peterbilt guys! You cannot use the same old gear ratios that the older engines use to achieve power, these are different engines. You have also attacked the interior of the Prostar... this is the most comfortable and best riding truck ever made! I realize I sell International for a living, but I have driven everything and nothing is a nice or comfortable as this truck... nothing, and this is even coming from Pete guys who wouldn't drive anything but a hood!
    The truck I had rode and handled great, very smooth.

    The engine was quiet and smooth. The clutch linkage is still mechanical on these trucks, and unless you grease it weekly it gets annoyingly loud.

    I think a 13 speed (instead of a 10) would have worked a lot better with the truck i had. It had pretty tall highway gears.

    There is not enough storage space on the inside, the bunk heater/ac/fan takes up way too much space under the bed.

    the windows do not seal properly at road speeds if you open and shut them. People who smoke will love to hate this truck.

    The doors are extremely drafty in cold weather.

    tons of air leaks from the cheap, brittle, thin air lines and fittings all over the truck that International used as yet another cost cutting measure. Constantly snap break and crack in cold weather

    The Regen system on the Junkforce 13 gives off atrociously nasty fumes FROM UNDER THE HOOD, worst smelling 2007 or newer emissions engine i have ever driven.

    Engine brake and horn buttons don't light up at night, and are in an awkward place on the steering wheel.

    Jake brake on 2009 prostar models is weak and useless.

    I could go on and on...


    International blew it big time...

  3. #133
    Road Train Member Cowpie1's Avatar
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    Quote Originally Posted by Salesman258 View Post
    I have read your post about the ProStar with a Maxxforce engine, and the only reply that I can think of is that it is spec'd out wrong. The Maxxforce 13 475hp engine with the right gear ratio WILL pull just as good as any Cummins, Cat, or Detroit! I have sold several of these trucks with the MaxxForce 13... granted I spec'd the first one out with the wrong gear ratio and it did not pull as well, but the rest have been great... and these are coming from Peterbilt guys! You cannot use the same old gear ratios that the older engines use to achieve power, these are different engines. You have also attacked the interior of the Prostar... this is the most comfortable and best riding truck ever made! I realize I sell International for a living, but I have driven everything and nothing is a nice or comfortable as this truck... nothing, and this is even coming from Pete guys who wouldn't drive anything but a hood!
    Been doing my research on a new truck with possibly doing the Maxxforce thing. What rear end ratio are you primarily recommending? I have seen a lot of them listed in truck paper, etc, with 3.21 ratios. My guess is that the engine will be turning roughly 1300 at 65 mph with low pro 22.5 rubber. Ballpark?

    I am not quite convinced that that would be the right ratio for me overall. I know that the 3.42 rear in back of my ISX are a little high for what I do. I have to run a fair amount of two lane roads and I generally do not run over 62 with occasional bumps up to 65 (and the occasional bump up to 80 just to get around a bunch of company trucks playing tiddly winks in both lanes because they can't pass each other). For my current setup, 3.58's would have been a better choice. I realize the MF-13 engine is designed to get torque at a lower RPM, but going to 3.21 would not a be a great idea unless I was only on flat, four lane roads all the time and consistently running 65 or more. I was considering staying with the 3.42 ratio if I got a Maxxforce. Maybe, just maybe, consider 3.36. Would be sticking with a 13 spd.

    Just wanted to know what ratios you are advising when customer orders their truck.

  4. #134
    Road Train Member Cowpie1's Avatar
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    Quote Originally Posted by diesel_weasel View Post

    Jake brake on 2009 prostar models is weak and useless.
    you must mean the proprietary compression brake on the Maxxforce. The MF didn't get a true jake brake as an option until recently. That should make a whale of a difference from now on. I have never experienced a good proprietary compression brake on anything.

  5. #135
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    Maxxforce 13

    Maxxforce 13

  6. #136
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    Quote Originally Posted by dieseldr View Post
    Maxxforce 13
    Best. Post. Ever.

  7. #137
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    Quote Originally Posted by diesel_weasel View Post
    The truck I had rode and handled great, very smooth.

    The engine was quiet and smooth. The clutch linkage is still mechanical on these trucks, and unless you grease it weekly it gets annoyingly loud.

    I think a 13 speed (instead of a 10) would have worked a lot better with the truck i had. It had pretty tall highway gears.

    There is not enough storage space on the inside, the bunk heater/ac/fan takes up way too much space under the bed.

    the windows do not seal properly at road speeds if you open and shut them. People who smoke will love to hate this truck.

    The doors are extremely drafty in cold weather.

    tons of air leaks from the cheap, brittle, thin air lines and fittings all over the truck that International used as yet another cost cutting measure. Constantly snap break and crack in cold weather

    The Regen system on the Junkforce 13 gives off atrociously nasty fumes FROM UNDER THE HOOD, worst smelling 2007 or newer emissions engine i have ever driven.

    Engine brake and horn buttons don't light up at night, and are in an awkward place on the steering wheel.

    Jake brake on 2009 prostar models is weak and useless.

    I could go on and on...


    International blew it big time...
    Some of these things concern me. I was thinking about having a look at a Prostar. I guess I'll just have to take one for a spin and see.


    EDIT: After reading more posts in the thread... maybe it isn't such a concern.
    Last edited by lostNfound; 05.17.2011 at 05.18 PM.

  8. #138
    Spoiled Rotten Brat O/O SHC's Avatar
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    Quote Originally Posted by lostNfound View Post
    Some of these things concern me. I was thinking about having a look at a Prostar. I guess I'll just have to take one for a spin and see.


    EDIT: After reading more posts in the thread... maybe it isn't such a concern.
    Yes, this thread was started a long time ago and it seems that IH may have worked out the bugs.... I too have been looking at the Prostar due to driver reccomendations. But so far, I can't see spending all that $$$ for a new truck, when a $20k truck will do the same thing.

  9. #139
    Bobtail Member
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    Quote Originally Posted by Cowpie1 View Post
    Been doing my research on a new truck with possibly doing the Maxxforce thing. What rear end ratio are you primarily recommending? I have seen a lot of them listed in truck paper, etc, with 3.21 ratios. My guess is that the engine will be turning roughly 1300 at 65 mph with low pro 22.5 rubber. Ballpark?

    I am not quite convinced that that would be the right ratio for me overall. I know that the 3.42 rear in back of my ISX are a little high for what I do. I have to run a fair amount of two lane roads and I generally do not run over 62 with occasional bumps up to 65 (and the occasional bump up to 80 just to get around a bunch of company trucks playing tiddly winks in both lanes because they can't pass each other). For my current setup, 3.58's would have been a better choice. I realize the MF-13 engine is designed to get torque at a lower RPM, but going to 3.21 would not a be a great idea unless I was only on flat, four lane roads all the time and consistently running 65 or more. I was considering staying with the 3.42 ratio if I got a Maxxforce. Maybe, just maybe, consider 3.36. Would be sticking with a 13 spd.

    Just wanted to know what ratios you are advising when customer orders their truck.

    sweet spot is 1375 rpms on the MF13. Ive been specing 3.36 with a 22.5LP, and 3.58 if using 11R22.5. The mechanical clutch linkage has been replaced with hydraulic, and the engine now has a Jacobs brand compression brake if they were concerns for you.

  10. #140
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    Quote Originally Posted by mkonei View Post
    sweet spot is 1375 rpms on the MF13. Ive been specing 3.36 with a 22.5LP, and 3.58 if using 11R22.5. The mechanical clutch linkage has been replaced with hydraulic, and the engine now has a Jacobs brand compression brake if they were concerns for you.

    I was really starting to get concerned about him. He kept complaining about the "Jake" (By which I assume he meant an engine brake although they make exhaust brakes as well) when the truck wasnt equipped with one.

    PS I dont much like the sleeper on my Ram 1500 either.

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