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  1. #1
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    N54 / N55 single turbo flange now available

    So with quite a few people building their own kits, and with how easy it was to change the cad drawing to also have a single flange we went ahead and did that, had a few cut, and welded.

    This flange will fit all N54's and N55's we had an N55 here so why not just measure it and add it to the drawing, making it universal. This flange comes COMPLETE ready for welding your runners onto it, no removable inserts you have to deal with welding in, just get the flange get your tubing and away you go.

    I cut 2 out of mild steel as a flange of this length I like to do out of mild steel due to its ability to flex a little more than SS. This said, we can cut them out of anything you want, just ask. Of course price will vary according to material.

    For now these are the prices for the 2 most basic materials

    Mild Steel: $250
    SS: $325

    Thanks guys
    Attached Images Attached Images     

  2. #2
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    Looks good! Would the mild steel warp in time with the heat it will be seeing?
    Burger Motorsports
    Home of the Worlds fastest N20s, N54s, N55s, S55s, N63s, and S63s!

    It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.

  3. #3
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    Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
    Looks good! Would the mild steel warp in time with the heat it will be seeing?
    Mild steel holds to heat better than SS generally.

  4. #4
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    Click here to enlarge Originally Posted by fastgti69 Click here to enlarge
    Looks good! Would the mild steel warp in time with the heat it will be seeing?
    Nah mild steel will be fine. Its a common flange material, and has great heat transfer and resistance. I prefer SS for the very short twin flanges but a flange of this length I like mild steel.

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    Oxidation isn't a problem with mild steel at the elevated temperatures?
    Eppur si muove.

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    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    Oxidation isn't a problem with mild steel at the elevated temperatures?
    No its not. For everyone asking questions about mild steel in turbo flanges. Just do a google search and see who is using mild steel. Basically everyone (full race, doc race, etc), its been used for years and has no issues.

  7. #7
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    Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
    No its not. For everyone asking questions about mild steel in turbo flanges. Just do a google search and see who is using mild steel. Basically everyone (full race, doc race, etc), its been used for years and has no issues.
    Not doubting you man, just curious.
    Eppur si muove.

  8. #8
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    looks good and the prices are very reasonable.

    I'm sure they'll sell quick.

  9. #9
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    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    Not doubting you man, just curious.
    Didn't think you were, wrote that real quick while running through the office, didn't mean it in any way other then friendly..Click here to enlarge

  10. #10
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    Click here to enlarge Originally Posted by VargasTurboTech Click here to enlarge
    Didn't think you were, wrote that real quick while running through the office, didn't mean it in any way other then friendly..Click here to enlarge
    No worries.
    Eppur si muove.

  11. #11
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    Click here to enlarge Originally Posted by E90Company Click here to enlarge
    Mild steel holds to heat better than SS generally.
    Really??? I'm sure it still depends on types of material used on both sides. I though it was vise versa.
    Burger Motorsports
    Home of the Worlds fastest N20s, N54s, N55s, S55s, N63s, and S63s!

    It is the sole responsibility of the purchaser and installer of any BMS part to employ the correct installation techniques required to ensure the proper operation of BMS parts, and BMS disclaims any and all liability for any part failure due to improper installation or use. It is the sole responsibility of the customer to verify that the use of their vehicle and items purchased comply with federal, state and local regulations. BMS claims no legal federal, state or local certification concerning pollution controlled motor vehicles or mandated emissions requirements. BMS products labeled for use only in competition racing vehicles may only be used on competition racing vehicles operated exclusively on a closed course in conjunction with a sanctioned racing event, in accordance with all federal and state laws, and may never be operated on public roads/highways. Please click here for more information on legal requirements related to use of BMS parts.

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    Google search

    "A very popular question concerning the use of Stainless steel over Mild steel in a Competition Header application constantly arises in the industry. Stainless Steel is a better choice when Header lifespan, updates, and quality are an important consideration. A Stainless Steel Competition Header, when properly built, will virtually last you a lifetime.
    A Mild Steel Header in a Competition application will soon take its toll from the elements of high exhaust temperature and rust. Performance Welding has tried many Exhaust Coating manufacturers and have found none that will withstand the extreme temperature of a competition engine. On the inside of the primary tubes and at the throat of the Merged Collector, the thermal barrier coating simply cannot withstand the high temperature and after a very short period, the coating burns off and rust begins to generate.
    This rust can be disastrous to any engine and can ruin many components.
    On initial overlap, there is an inevitable reversion pulse that can send exhaust back up the intake tract. If the rust loosens in the header primary tube it can, and sometimes, will carry some of this abrasive material into your cylinder.
    It is highly advisable after leaving Mild Steel Competition Headers over a period of time to take any precautions to remove the rust build up; on initial engine start up this rust can be disastrous.
    Stainless Steel Headers have many benefits outweighing the initial cost increase. Due to the fact that they do not need a Thermal Barrier coating you save a few hundred dollars on the initial cost. Stainless Steel Headers can be repaired, or modified at any time in their lifespan due to the simple fact that they do not rust and do not need a Thermal coating. Mild Steel Headers are very tough to repair or modify due to Thermal Coatings and rust.
    It is believed that due to Stainless Steel Thermal characteristics, the high exhaust temperature is retained inside the primary tubes and can increase the exhaust speed in the header, which in a Competition Racing Header sometimes is an important goal. Due to the simple fact that there is no rust generated, the inside of each primary tube will stay smooth and flow accordingly.

    Performance Welding Racing Headers feel strongly about the use of Stainless Steel in your Competition Header application. If you have a Race vehicle that you truly wish your Competition header to last a lifetime, or if we have a proven Competition Header for your engines combination, or you simply like the benefits of Stainless Steel we highly recommend it in any Competition Header application."
    2011 335is DCT, moving to Italy, looking for new car friends Click here to enlarge

  13. #13
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    Just like Tony said, all the big names use mild steel. Huh. As a former welder I'm pretty surprised about that. Although it makes welding them alot easier LOL.

    http://www.full-race.com/store/acces...ad-flange.html
    2011 335is DCT, moving to Italy, looking for new car friends Click here to enlarge

  14. #14
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    Click here to enlarge Originally Posted by bigdnno98 Click here to enlarge
    Google search

    "A very popular question concerning the use of Stainless steel over Mild steel in a Competition Header application constantly arises in the industry. Stainless Steel is a better choice when Header lifespan, updates, and quality are an important consideration. A Stainless Steel Competition Header, when properly built, will virtually last you a lifetime.
    A Mild Steel Header in a Competition application will soon take its toll from the elements of high exhaust temperature and rust. Performance Welding has tried many Exhaust Coating manufacturers and have found none that will withstand the extreme temperature of a competition engine. On the inside of the primary tubes and at the throat of the Merged Collector, the thermal barrier coating simply cannot withstand the high temperature and after a very short period, the coating burns off and rust begins to generate.
    This rust can be disastrous to any engine and can ruin many components.
    On initial overlap, there is an inevitable reversion pulse that can send exhaust back up the intake tract. If the rust loosens in the header primary tube it can, and sometimes, will carry some of this abrasive material into your cylinder.
    It is highly advisable after leaving Mild Steel Competition Headers over a period of time to take any precautions to remove the rust build up; on initial engine start up this rust can be disastrous.
    Stainless Steel Headers have many benefits outweighing the initial cost increase. Due to the fact that they do not need a Thermal Barrier coating you save a few hundred dollars on the initial cost. Stainless Steel Headers can be repaired, or modified at any time in their lifespan due to the simple fact that they do not rust and do not need a Thermal coating. Mild Steel Headers are very tough to repair or modify due to Thermal Coatings and rust.
    It is believed that due to Stainless Steel Thermal characteristics, the high exhaust temperature is retained inside the primary tubes and can increase the exhaust speed in the header, which in a Competition Racing Header sometimes is an important goal. Due to the simple fact that there is no rust generated, the inside of each primary tube will stay smooth and flow accordingly.

    Performance Welding Racing Headers feel strongly about the use of Stainless Steel in your Competition Header application. If you have a Race vehicle that you truly wish your Competition header to last a lifetime, or if we have a proven Competition Header for your engines combination, or you simply like the benefits of Stainless Steel we highly recommend it in any Competition Header application."
    This is talking about making the entire header out of mild steel, a terrible choice and one I would never make. But using mild steel for flanges has its benefits. Its pretty basic, if you want a SS flange, we will cut you one, you want MS we will cut that as well. Its up to you, but for a flange of this length I prefer MS.

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    2 out of 2 members liked this post. Yes Reputation No
    tony, 3/8" for the flange?

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    Click here to enlarge Originally Posted by camberadam Click here to enlarge
    tony, 3/8" for the flange?
    Yessir 3/8", if a thicker flange is wanted, also not a problem. Just let us know.

  17. #17
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    Concerning mild vs. stainless, mild steel conducts heat better (about 3x better), so there is not as large of a heat gradient localize within the flange, and this causes the entire flanged to expand and contract due to thermal expansion at a more uniform rate vs. stainless. This is what prevents warping when using mild steel flanges instead of stainless.
    Eppur si muove.

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    Click here to enlarge Originally Posted by ajm8127 Click here to enlarge
    Concerning mild vs. stainless, mild steel conducts heat better (about 3x better), so there is not as large of a heat gradient localize within the flange, and this causes the entire flanged to expand and contract due to thermal expansion at a more uniform rate vs. stainless. This is what prevents warping when using mild steel flanges instead of stainless.

    Gotta love all the nerds we've got here.

  19. #19
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    Click here to enlarge Originally Posted by klipseracer Click here to enlarge
    Gotta love all the nerds we've got here.
    LOL, I embrace it.
    Eppur si muove.

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    What grade of stainless are the flanges being cut from? It should be noted that while your typical austenitic grades (304/L, 316/L, etc) have relatively low thermal conductivity, matensitic grades (416, 440C, etc) will have some improvement in that regard.

    Also, the coeff. of thermal expansion is slightly higher for austenitic SS than it is for martensitic SS or mild carbon steel. Another consideration there.

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    Click here to enlarge Originally Posted by EvanL Click here to enlarge
    What grade of stainless are the flanges being cut from? It should be noted that while your typical austenitic grades (304/L, 316/L, etc) have relatively low thermal conductivity, matensitic grades (416, 440C, etc) will have some improvement in that regard.

    Also, the coeff. of thermal expansion is slightly higher for austenitic SS than it is for martensitic SS or mild carbon steel. Another consideration there.
    You guys can crunch numbers on the different thermal expansion of flanges all day if you want. We know what works and never has issues. If someone wants something cut out of a specific grade of SS let us know, its not an issue. On a flange of this length I would run MS on my own personal car, as its cheap and proven. Let the over analysis continue...Click here to enlarge

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    Part of being a good engineer is knowing when to stop being an engineer.

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    N55 guys are getting some love finally!
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    Stage 2 or 2.5 E9X M3 S65 V8 supercharger kit for sale
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    Knowledge means knowing Tomato is a fruit. Wisdom is knowing not to put it in a fruit salad.
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    MOTIV750, MOTIV P-1000 PI, MOTIV/FUEL-IT! low pressure fuel system, AEM EMS/COBB AP, Aquamist HFS-3, ETS FMIC, SPEC stage 3+ clutch/SS flywheel, BC Racing coilovers and VMR wheels wrapped in Hankook RS3s.

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    Over-analysis? Sheesh, I asked a question. Then I (and others before me) provided some information that supports your recommendation of MS over SS. Only reason I provided information on grades of SS is in case a potential customer absolutely must have it, they can request something suitable for the application.

    Besides, isn't this place meant to help people learn and understand things in further detail? That's the way I've always approached these forums...

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