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  1. #1
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    Reducing Engine Bay Temps

    Hi

    I have a friend with a Subaru STI, he heat-wrapped his downpipe.
    according to him this would allow the hot gases to flow out quicker as well as reduce temps in the engine bay.
    is it worthwhile doing the same to my car?

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  3. #2
    MIKE GTR's Avatar
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    Its a mission and you itch for hours, but every little bit helps - the idea is that it keeps the exhaust hotter, promoting flow and also prevents its from heating the engine bay, for best results you'd need a wrap, high temp coating and turbo jacket, but expect them to smoke like a git to start and then smell awful and if any oil gets on them to catch fire lol.

    My skylines exhaust is wrapped all the way to the back box, i'd advise using expensive wrap for the manifold and downpipe, thhen on to the cheaper wrap for the rest

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    thanks for the reply mike
    if any oil gets on them they catch on fire? that extreme?

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    MIKE GTR's Avatar
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    They hold onto the oil and smoke really badly, i've had a friend who had to use a fire extinguisher when at brands hatch and the only oil on it was from his oily hands when fitting the wrap, so i'm sure any leak of oil would extenuate the problem

  6. #5
    <tuffty/>'s Avatar
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    I got my stuff from here...

    http://www.exhaustwrapshop.com/

    I didn't get the turbo jacket in the end as mine is internally gated and the jacket would have fouled the wastegate/actuator..

    Prob gonna get my hotside/mani/downpipe ceramic coated next time around I think

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  7. #6
    MIKE GTR's Avatar
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    I considered ceramic coating for the skyline, but it worked out too expensive for me

  8. #7
    <tuffty/>'s Avatar
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    Yeah.. its not cheap

    <tuffty/>
    Silver 2001 AMK S3. Silver alcantara interior... now with added powarrrrrrrr, torques. VAGCOM + KII-USB. >> My build thread...

  9. #8
    Welly's Avatar
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    Quote Originally Posted by tufftybloke View Post
    Yeah.. its not cheap

    <tuffty/>
    However, you get what you pay for....
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  10. #9
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    yknow where the bulk head is and where the bonnet shuts, there is a rubber seal running from left to right.

    remove that. ive found that makes a good difference to engine bay temps. having the undertray in place is good too

  11. #10
    MIKE GTR's Avatar
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    Why not do what the fiesta and saxo boys do and have some bonnet stay lifters lol

  12. #11
    Welly's Avatar
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    Quote Originally Posted by MIKE GTR View Post
    Why not do what the fiesta and saxo boys do and have some bonnet stay lifters lol
    Why didn't I think of that? It's so obvious now. Combine it with a HUGE bonnet vent for extra sex appeal....
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    Quote Originally Posted by Prawn View Post
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  13. #12
    MIKE GTR's Avatar
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    Quote Originally Posted by Welly View Post
    . Combine it with a HUGE bonnet vent for extra sex appeal....
    Sounds suspiciously like someone is talking from experience lol

  14. #13
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    Quote Originally Posted by MIKE GTR View Post
    Sounds suspiciously like someone is talking from experience lol
    Busted

    I may of had a small Scooby vent on my redtop corsa - but that actually was for performance reasons. It helped the cold air flow in to the filters on the R1 carbs..... That way the extra weight of the fibreglass bodykit was accounted for....lol.

    Hey, the past is only what directs you in to the future.... I realised the error of my ways.
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    Quote Originally Posted by Prawn View Post
    Wellyboots, you are quite literally my most favourite pikey in the entire world




  15. #14
    MIKE GTR's Avatar
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    Lol mate I've made some errrr 'misjudgments' shall we say, I once had a pepermint green mk2 astra that I put a calibra turbo engine in, I cringe at the thought of having driven round in it lol, but it was quick at the time -

    But then again, i suppose if you strap a turbo to a turd, its still a turd, just a faster one

  16. #15
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    Quote Originally Posted by MIKE GTR View Post
    Lol mate I've made some errrr 'misjudgments' shall we say, I once had a pepermint green mk2 astra that I put a calibra turbo engine in, I cringe at the thought of having driven round in it lol, but it was quick at the time -

    But then again, i suppose if you strap a turbo to a turd, its still a turd, just a faster one
    Indeed. I try and avoid fast turds. They splatter.
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    Quote Originally Posted by Prawn View Post
    Wellyboots, you are quite literally my most favourite pikey in the entire world




  17. #16
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    Does anyone know of an S3 with bonnet vents?
    I'm not talking huge scooby scoop or plastic RS Turbo style add-ons, but properly custom done?

    I think it might look alright if it's subtle, maybe 3 or 4 slats on the airbox side of the bonnet - nicely assymetrical?

    ///

    Like that.
    That would have an effect, surely?
    2001 Audi RS4 2.7 Bi-Turbo - Nogaro Blue

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  18. #17
    MIKE GTR's Avatar
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    LOurves i'd consider, but not a bonnet full lol, just one or two

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    Quote Originally Posted by Welly View Post
    Combine it with a HUGE bonnet vent for extra sex appeal....
    what you were thinking of was SEX PANTHER It's illegal in nine countries... Yep, it's made with bits of real panther, so you know it's good



    etc

  20. #19
    JS1500's Avatar
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    Louvres, that's the word I was looking for!

    If done right it could look good and make a difference to performance I reckon.
    But what do I know, i've got a stripey MG Midget!
    2001 Audi RS4 2.7 Bi-Turbo - Nogaro Blue

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  21. #20
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    Quote Originally Posted by Matt82 View Post
    what you were thinking of was SEX PANTHER It's illegal in nine countries... Yep, it's made with bits of real panther, so you know it's good



    etc
    80% OF THE TIME IT WORKS ALL THE TIME!!!! LOL

  22. #21
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    I cut a little of the rubber seal near the strutbrace, i was amazed how much heat come out of it now, worth a try, every little helps

    3.2 V6 with Custom Code VVT Attack Software


  23. #22
    JS1500's Avatar
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    Yeah, and those big red arrows should help the heat find the way out.
    2001 Audi RS4 2.7 Bi-Turbo - Nogaro Blue

    1975 MG Midget 1500 - Tahiti Blue

    2003 Audi S3 - Dolphin Grey; SOLD!

  24. #23
    Westy's Avatar
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    When I had my old Renault 5 turbo I used to have to open the air vents and put the heating on full blast in the summer to keep the engine cool!!!
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  25. #24
    MIKE GTR's Avatar
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    Quote Originally Posted by JS1500 View Post
    Louvres, that's the word I was looking for!

    If done right it could look good and make a difference to performance I reckon.
    But what do I know, i've got a stripey MG Midget!
    The key is knowing when to stop lol.

    Boring fact of the day, My dad has got a 1957 MGA, he's chairman of the NOrth London MG Owners club - Now there's a group of potential child molesters if ever I saw one lol

  26. #25
    MIKE GTR's Avatar
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    Quote Originally Posted by sandip View Post
    I cut a little of the rubber seal near the strutbrace, i was amazed how much heat come out of it now, worth a try, every little helps
    Probably on par with the amount of water that comes in lol

  27. #26
    Welly's Avatar
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    Awwwww, this is making me feel all warm and fuzzy inside thinking about all the stupid things I had to do it the past to make cars work properly...

    My mate had a Nova, and the only way you could switch the ignition on was to take the hazard switch out and turn it round, then put it back in and bump it. (A well known fact on the Nova - made them easy to steal).
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    "Marriage is like a coffin and each kid is another nail."
    Homer Simpson

    Quote Originally Posted by Prawn View Post
    Wellyboots, you are quite literally my most favourite pikey in the entire world




  28. #27
    Welly's Avatar
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    Quote Originally Posted by MIKE GTR View Post
    Probably on par with the amount of water that comes in lol
    Thats what cools the bay down dude! Come on, think on your feet!
    ------------------------------------------------------------------------------------------
    "Marriage is like a coffin and each kid is another nail."
    Homer Simpson

    Quote Originally Posted by Prawn View Post
    Wellyboots, you are quite literally my most favourite pikey in the entire world




  29. #28
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    I've investigated that one lol Wash my car quite often and aslong as the actual seal is on you should be fine, i've only cut the spongy bit so the turbo hasn't got niagara falls on it everytime it lashes it down lol
    3.2 V6 with Custom Code VVT Attack Software


  30. #29
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    Quote Originally Posted by Welly View Post
    Thats what cools the bay down dude! Come on, think on your feet!

    /\ /\ lol!!!

    surely lots of water on a red hot turbo isn't too good!!! lol

  31. #30
    MIKE GTR's Avatar
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    Quote Originally Posted by kitpayne View Post
    /\ /\ lol!!!

    surely lots of water on a red hot turbo isn't too good!!! lol
    What do u think happens with the water from the road

  32. #31
    kitpayne's Avatar
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    does it make it up to the turbo??

    i meant the water running from the windscreen

  33. #32
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    Did this last year, tested aswell, deosnt let any water in so all good.

    It's amazing to see how much heat actually rises up from under the bonnet, also cut the front bumper up, well behind it anyway. haha.
    Driving the most secretive S3 on ASN

  34. #33
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    Stop cutting bloody rubber seals and just buy a fmic
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  35. #34
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    "F**k You Dale"
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