exhaust manifolds

Discussion in 'Trucks [ Eighteen Wheelers ]' started by eb1, Apr 9, 2012.

  1. eb1

    eb1 Bobtail Member

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    are the performance ones (pdi, pittsburgh power worth the money if your running the stock turbo
     
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  3. Stuskw

    Stuskw Bobtail Member

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    I put a bullydog ported and polished one on a 12.7L Detroit with a stock turbo (before I got on this site and got "educated"!) and it dropped the EGT 250 - 300 degrees. Can't say about fuel mileage since I did a rebuild when I put it on so hard to say what it would have changed over the stock one. For sure it helped the EGT's though
     
  4. Cowpie1

    Cowpie1 Road Train Member

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    Those lower EGT's are a result of increased flow with one of the ported and coated manifolds. They are well worth it. That increased flow will allow for better turbo spool up and will almost always mean an mpg gain of a tenth or two. With a Detroit 12.7, opening up the wallet a little more ($700) and adding a Borg Warner 171702 turbo to the mix and you will definitely see some improvement, and quite possibly gain a gear or a split on the hills. And the icing on the cake is putting on high flow mufflers like Walker Megaflows. It is well within reason to expect somewhere in the .5 mpg improvement range if one did all of that. ROI would be only a few months.
     
  5. SHC

    SHC Spoiled Rotten Brat O/O

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    PDI, BD and Pitt are all the same manifold. I spoke with them all at MATS and the BD booth had the guy from Full Tilt that makes them.

    Basic manifold flows 30% more than stock
    Coated/ported flows 40% more than stock
     
    Oxbow Thanks this.
  6. underpsi

    underpsi Road Train Member

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    Toronto, Ont
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    PDI has thier own now. They used to sell the Full Tilt manifolds
     
  7. Dice1

    Dice1 Road Train Member

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    I switched in February last year from the stock OEM on my 98 Cat 3406E to the Pittsburgh Power exhaust manifold and you can see the difference in these pictures side by side of mine.

    [​IMG]
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    You can see the it is alot smoother and is suppose to flow 40% better than stock OEM manifold.



    I made this change along with PP's larger turbo (B/W) for a gain of 6/10ths mpg and it had alot more top end power with cooler turbo temps. Sorry I can't tell you the gain of just the manifold and the turbo does have alot less backpressure on the interstate that would produce better mpg's.

    Here is the turbos side by side.
    [​IMG]

    The new turbocharger has no wastegate also.

    The PP exhaust manifold and turbo allow me to run my PP Box in higher levels without it cutting back when the exhaust temps reach 1300 degrees. Considerably cooler exhaust temps at a higher level setting on the PP Box.

    Well worth the investment and would do it again.
     
  8. MNdriver

    MNdriver Road Train Member

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    Doing something like that make a LOT of business sense to me. It gets you up and over the hills quicker which will kill your mileage.
     
  9. eb1

    eb1 Bobtail Member

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    Jul 21, 2011
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    Thanks everybody another question what turbo to use pdi, pp, or use stock
     
  10. Cowpie1

    Cowpie1 Road Train Member

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    Getting up and over the hill quicker will kill your mileage? Then how come just about everyone who does this experiences increased mpg? You'll have to try and convince several people I know that did the exhaust manifold and turbo and high flow mufflers and are now experiencing one less gear drop on average on a hard pull and they are getting mpgs in the high 7's to low 8's when they used to get mpg's in the mid 6's.

    But let's go with your concept that putting on these mods will cause an increase in fuel consumption and screw up fuel mileage:


    Truck #1:
    A Detroit Series 60 equipped tractor going up a grade at 1600rpm has a fuel burn rate of approximately 24 gal/hr or 0.40 gal/min.

    If it takes the tractor 30 seconds to climb this grade, 0.20 gallons of fuel are burnt during this heavy load situation.

    Truck #2 (with mods):
    The same Detroit equipped tractor, but now pumped up with various mods going up that same grade at 1600 rpm will have a burn rate of approximately 26.5 gal/hr or 0.44 gal/min. Yes, definitely a higher fuel consumption rate.

    However, with the mods installed, it only takes the tractor 20 seconds to climb the same grade, which correlates to .13 gallons of fuel burnt meaning .07 gallons of fuel were actually saved under the same heavy load situation.

    With increased power comes increased responsibility. It does have to be used wisely. But the blanket "more power means lousy mpg" junk fed by truck companies and such doesn't wash when a truck is in the hands of a responsible driver. I know a couple of people that are laying down over 700 real hp to the rear wheels, but are getting well into the 7's for mpg pulling heavy loads on grades. One that I know of, but not personally, has a documented mpg average of 7.5 to 8.2 running 70 mph average with a Cat 6NZ that is putting out 725 hp stuck inside a Pete 389 brick. Sure he is only loaded half the time, but when he is pulling, he is right up on top of 80,000 lb. And I know several people personally that have done these type of mods, even without bumping up HP, and are well into the 8's most of the time.

    You can't just floor it and scoot. You have to use the power wisely, and when you do, you will have better mpg than a stock engine, and the engines will generally last longer.
     
    Last edited: Apr 12, 2012
  11. Cowpie1

    Cowpie1 Road Train Member

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    More detail needed. What engine? What year?
     
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