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Thread: Reducing Engine Bay Temperatures

  1. #1
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    98 Turbo M3, 04 E53 X5

    Reducing Engine Bay Temperatures

    We all have the same problem. Heat Soak. I started brainstorming on ways to get cooler air to the turbo. With a top mount, AC, and barely any room for ducting, the struggle is real.

    A vented hood is out of the question.

    Im exploring using the brake duct hole in the bumper since my stock brake ducts can no longer fit with the IC piping. Im also seeing what I can do with an old fog light housing.

    Im doing to pull down the under tray to see how I can fit something. Maybe a marine style blower motor....I can see that the turbo is getting hot air from the radiator fan while the hood is closed.

    Any suggestions?
    Last edited by NY98M3; 07-30-2018 at 08:11 PM.

    98 Fern Green M3/2 - Precision 6870/AR Designs Twin Scroll/RK/E85
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  2. #2
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    I made an air duct to the holes in front of the radiator. The kidney grill holes. Air dam around to the turbo intake.
    1989 535i - sold
    1999 M3 Tiag/Dove - sold
    1998 M3 Turbo Arctic/black - current
    2004 Built motor TiAg/Black - Sold
    2008 E61 19T Turbo-Wagon - current
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    1998 M3 Cosmos S54 swapped Sedan - current

    1998 Turbo: PTE6870 | 1.15 ar | Hp Cover, Custom Divided T4 bottom-mount, 3.5" SS exhaust, Dual Turbosmart Compgates, Turbosmart Raceport BOV, 3.5" Treadstone Intercooler, 3.5" Vibrant resonator and muffler, Arp 2k Headstuds | Arp 2k Main studs | 87mm Je pistons | Eagle rods | 9.2:1 static compression, Ces 87mm cutring, Custom solid rear subframe bushings, Akg 85d diff bushings, 4 clutch 3.15 diff, , Poly engine mounts, UUC trans mounts W/ enforcers, 22RPD OBD2 Stock ECU id1700 E85 tune, 22RPD Big power Transmission swap w/ GS6-53

  3. #3
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    I take my hood off at the track and lean it against the fence. Taking the gasket off from around the hood helps too.


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  4. #4
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    95 M3, 15 Golf TDI wagon
    Venting the hood is out of the question?

    I know you have a super clean car.

    -WTB: OEM Class 2 LTW GT wing with risers- Mazak

  5. #5
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    Bima
    you already have a turbo blanket?
    because that shit WORKS. it's amazing the temp control it provides.

  6. #6
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    E36 Turbo
    Convert to Bottom mount

  7. #7
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    E36
    Also interested in a solution without hacking the hood with vents. But it is a non m so I might just hack away....

  8. #8
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    Euro S50B30 BEP S372
    Engine bay pic?
    I double taped the downpipe as tight as possible,plus a good quality turbo blanket and i had no high temp problems......

  9. #9
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    You can also use some of this stuff with metal ties. I've had much better luck with the aluminum backed insulation mat like this than the fiberglass insulation wrap.

    https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1

  10. #10
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    Reducing Engine Bay Temperatures

    Quote Originally Posted by Kevin325i View Post
    You can also use some of this stuff with metal ties. I've had much better luck with the aluminum backed insulation mat like this than the fiberglass insulation wrap.

    https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1
    THAT STUFF LOOKS GOOD!


    Sent from my iPhone using Tapatalk
    1989 535i - sold
    1999 M3 Tiag/Dove - sold
    1998 M3 Turbo Arctic/black - current
    2004 Built motor TiAg/Black - Sold
    2008 E61 19T Turbo-Wagon - current
    2011 E82 135i - S85 Swap - current
    1998 M3 Cosmos S54 swapped Sedan - current

    1998 Turbo: PTE6870 | 1.15 ar | Hp Cover, Custom Divided T4 bottom-mount, 3.5" SS exhaust, Dual Turbosmart Compgates, Turbosmart Raceport BOV, 3.5" Treadstone Intercooler, 3.5" Vibrant resonator and muffler, Arp 2k Headstuds | Arp 2k Main studs | 87mm Je pistons | Eagle rods | 9.2:1 static compression, Ces 87mm cutring, Custom solid rear subframe bushings, Akg 85d diff bushings, 4 clutch 3.15 diff, , Poly engine mounts, UUC trans mounts W/ enforcers, 22RPD OBD2 Stock ECU id1700 E85 tune, 22RPD Big power Transmission swap w/ GS6-53

  11. #11
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    Quote Originally Posted by someguy2800 View Post
    Taking the gasket off from around the hood helps too.
    will try this. Thanks

    Quote Originally Posted by 3literheater View Post
    Venting the hood is out of the question?

    I know you have a super clean car.
    No way Im venting the hood, the sleeper factor is high here.

    Quote Originally Posted by Robocop View Post
    you already have a turbo blanket?
    because that shit WORKS. it's amazing the temp control it provides.
    yes, still tons of heat.

    Quote Originally Posted by NOTORIOUS VR View Post
    Convert to Bottom mount
    Bottom mount limits the size of the turbo

    Quote Originally Posted by Kevin325i View Post
    You can also use some of this stuff with metal ties. I've had much better luck with the aluminum backed insulation mat like this than the fiberglass insulation wrap.

    https://www.amazon.com/gp/product/B0...e?ie=UTF8&th=1
    Will look into this over the winter since the dp would need to be taken off to wrap it. 3.5" is 1/8" away from the strut tower.

    Im going to try and route some ducting up to get "some" cooler air in there.

    98 Fern Green M3/2 - Precision 6870/AR Designs Twin Scroll/RK/E85
    2017 Toyota Tundra Crewmaxx - Family Whip
    2011 Pierce 75' Quint - Fire Apparatus West Islip FD

  12. #12
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    Turbo 97 E36 M3, 99 M3
    So, we all know that the e36 was never designed to have a turbo, much less have a turbo in the engine bay. The options are evac the heat or combat it....vented hood is a no go (evac), removing gasket will only do so much and probably not enough (evac), you are running a turbo blanket (combat). I'm guessing there are no other options to evac the heat sufficiently, so maybe a solution is a little radical:

    http://www.enginebasics.com/Advanced...0Sprayers.html

    You could run a line along the fender, behind the shock tower, and maybe trigger a mist/fogger using your windshield washer fluid container. I don't know if you still use it for your windows. I don't know where the ideal place to aim the jets, but maybe something to think about?
    1997 Arctic Silver/Black M3
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  13. #13
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    Quote Originally Posted by NY98M3 View Post
    Will look into this over the winter since the dp would need to be taken off to wrap it. 3.5" is 1/8" away from the strut tower.

    Im going to try and route some ducting up to get "some" cooler air in there.
    I'm using the 1/4" thick stuff and it can be compressed quite a bit. I would bet money you'll be fine. Also you typically want to leave a small gap in it so it can expand and moisture can fall out. You could just make sure the gap lines up with the strut tower. I'm using the 12" wide stuff around a 3.5" downpipe and it's about a 1-2" gap that it leaves depending on the bends you're making.


    Another solution might just be a second fan underhood. I added a mechanical fan back in. I'm also pretty ocd about a factory appearance for the car and I picked up an e46 m3 HVAC plastic vent to put a hole just behind the radiator. It might look a little funny on a coupe though because you'll have the slots in the hood for hvac and a plastic piece inserted in it.

    www.ecstuning. com/b-genuine-bmw-parts/hood-vent/51132694723/?gclid=EAIaIQobChMI5NKrhLXM3AIVzbjACh0RBQAIEAQYAyA BEgLTfvD_BwE



    I haven't installed it yet because I suck and this new turbo setup is taking forever but I don't think it will even register to the average person. Most 'car' people have trouble finding the bottom mount turbo on these cars if the hood is open..
    Last edited by Kevin325i; 08-01-2018 at 01:53 PM.

  14. #14
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    Wrapping or ceramic coating the downpipe and manifold will help a lot .


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  15. #15
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    but by how much? any numbers?

  16. #16
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    Wrapping or ceramic coating the outside only will reduce the underhood temperatures, but the downside is that it will also kill the pipes themselves by holding all of the heat in them. Ceramic coating inside and outside will reduce the temps while protecting the pipe itself.

    Marty

  17. #17
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    There is no way I would put a coating upstream of my turbine wheel. The jet hot type exterior coatings do work really well. DEI titanium wrap is great as well. You can put your hand on it when the manifold is several hundred degrees.


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  18. #18
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    The op has ceramic coated pipes, turbo blanket, and heat wrap......

  19. #19
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    Quote Originally Posted by E36 HateR View Post
    The op has ceramic coated pipes, turbo blanket, and heat wrap......
    Sounds like he is doing all he can to keep the heat in the exhaust. Only thing left is to get the heat out of the engine bay, IE airflow in and out.


    86 325es, 2.8L m50, S476sxe, ProEFI 128 ecu, e85, solid rear axle, TH400 trans, 28x10.5w slicks, zip ties, popsicle sticks, tape
    best time 9.06 @ 151.8 mph, best 60 foot 1.30

  20. #20
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    Makes whoosh noises
    Have you considered a vented hood for events and having your minty OE hood for the rest of the time? This is what I've done although I do end up running the vented hood most of the time right now as I love how much cooling it provides.

    1000+RWHP, Lab22 Built Turbo S54 - BMW Half Mile Record Holder

  21. #21
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    Hey man

    the vented hood was probably the best part of this entire build, it really looks killer in person, car turns tons of heads when people see that s366 through the vents at stoplights


    not to mention my thermo gun shows a significant reduction in ambient temps in there, I say get the hood.

    99 Turbo M3 - BWs366 - RSI - Fuse Fabrication - JE Cutring -

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