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engine & exhaust really hot?

Discussion in 'A3/S3 Forum (8L Chassis)' started by finny_quattro, Jul 26, 2010.

  1. finny_quattro

    finny_quattro Member

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    since i bought the car i noticed it gets pretty hot although both fans do kick in even after the car only been running for 10-15 mins it will be really hot! i was told this could be down to the cats? the back box even gets pretty hot....is this actually normal or not? ive just had a full service so obviously coolant has been done but still the same?
     
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  3. <tuffty/>

    <tuffty/> Badger 5 Edition...Its all about the flow...
    Staff Member Moderator Audi S3

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    Define hot... hot as in over 90 degrees on the dash or hot as in hot in general? Turbo cars get firkin hot... exhaust temps can reach over 900 degrees and the exhaust mani will glow bright red when given the beans... stainless steel exhausts will actually grow when hot... mine pokes out at least another 15mm or more when I have driven the car 'enthusiastically'

    When on the dyno the other week I had the AFR probe clamped onto the tail pipe with a bit of cardboard to prevent marking the tips and it caught fire from the heat...

    <tuffty/>
     
    #2 <tuffty/>, Jul 26, 2010
    Last edited: Jul 26, 2010
  4. Sandip

    Sandip Well-Known Member

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    :salute:

    I agree with you Paul mine also pokes out a bit more when it get up to temp :)
     
  5. finesse

    finesse Active Member
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    normal, as long as the dash reads 90 degrees
     
  6. Dazboss

    Dazboss Like A Thristy Dingo ;)

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    Im gonna cook some eggs on mine or warm up a pasty :)
     
  7. voorhees

    voorhees Moderator
    Staff Member Moderator Team Brill Red Black Edition

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    Check your oil and coolant to be sure
     
  8. Matt82

    Matt82 Active Member

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    ive always said i thought the under bonnet temps on these things were unhuman
     
  9. The Doctor

    The Doctor Well-Known Member

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    Why do you need to check oil & coolant to cook eggs or warm up a pasty? I don't get it.
     
  10. Matt82

    Matt82 Active Member

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    well double ester extra virgin swiss olive oil would be best
     
  11. voorhees

    voorhees Moderator
    Staff Member Moderator Team Brill Red Black Edition

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    To get the correct heat to eradicate the possibility of salmonella:yes:
     
  12. finesse

    finesse Active Member
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    lol
     
  13. Dani_B19

    Dani_B19 Audi-sports own special child.

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    I agree, even with the heat proofing, rubber strip cut out and front grille cut out, it's still extreme under my bonnet.
     
  14. Welly

    Welly VX220 SC Driver :)

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    My mate is making me some spacers to raise the back of the bonnet about an inch. Will put my temp sensor under the bonnet before and after to prove concept.
     
  15. Dazboss

    Dazboss Like A Thristy Dingo ;)

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    Yeah be interesting too see that result Welly.
     
  16. Dani_B19

    Dani_B19 Audi-sports own special child.

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    Cough *CHAV* Cough :), haha. On a serious note though, would be good to see how much it helps lower the temps.
     
  17. Welly

    Welly VX220 SC Driver :)

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    :(

    It's for function rather than form....
     
  18. Matt82

    Matt82 Active Member

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    i noticed a difference (but didnt use temp probes) just by removing the rubber strip from the back of the engine bay
     
  19. Welly

    Welly VX220 SC Driver :)

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    Yep, thats gone on mine - the only issue being that I get the smell of heat in the cabin, as it comes up and into the pollen filter.
     
  20. Dani_B19

    Dani_B19 Audi-sports own special child.

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    Have you tried cutting out the plastic behing the upper grille? i did aswell as removing the bonnet heat proofing and cutting the rubber strip at the back, works a treat, plus the DV is louder :).
     
  21. Prawn

    Prawn My other car is a MINI!!!!

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    sadly welly, I don't think your idea of raising the bonnet will work at all.

    From aero testing done on minis, it was shown that there was actually higher pressure at the back edge of the bonnet where the screen goes up, and a result, gases were actually drawn INTO the back edge of the bonnet rather than escaping!
     
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  23. Welly

    Welly VX220 SC Driver :)

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    That's most interesting actually dude, you any links to data? Would be an interesting read, I love things like that.

    Anyway, two reasons I will be doing it still....

    Now I've given this some considerable thought, the interesting thing is the slightly upturned lip at the back of the S3/A3 bonnet. In my mind, air rushing over....

    Sod it, I'll draw a diagram...

    [​IMG]

    That's my basic theory of how it would work, which is why I'd be grateful for any info you can pass on Prawn :thumbsup:.

    Secondly, the majority of my heat build-up under the bonnet comes from giving the car a bit of beans, and then stopping. Now stopping being in traffic, or whatever, means that when I get going again, the UBT has gone up by many degrees from the heat of the turbo, heating the air up.

    Raising the back of the bonnet up will at least allow the air being heated by the turbo to vent straight out through the gap, as it naturally will. I have proved this as a concept by removing the rubber strip at the back, and watching the heat coming out whilst stopped at traffic lights or the like.

    Hopefully, this will greatly aid the effort to keep under the bonnet cooler, as the hot air is not being trapped after being heated by (a normally glowing) turbo...

    Thoughts?
     
  24. Welly

    Welly VX220 SC Driver :)

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    And yes, my diagram is Imola Yellow - and yes, it is because I am THAT sad. :thumbsup:
     
  25. Matt82

    Matt82 Active Member

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    thats how my "take out the rubber" bit system goes
     
  26. Welly

    Welly VX220 SC Driver :)

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    Yeah, that's been done already (was my proof of concept - lol), but I think there is room for improvement.
     
  27. finny_quattro

    finny_quattro Member

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    well thats alot of worry off my mind....i just noticed the whole thing was boiling..although temp gauge is perfect at 90 when i take the engine cover off etc its hard to even touch the back of it lol but hey if its normal who cares il just wait until its properly cold

    cheers lads
     
  28. thorsy22

    thorsy22 Member

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    If the front of the bonnet was raised slightly as well, I think it would help immensely as would create a wind tunnel type affect (i'm sure theres a technical term so insert here).
    Now raising the whole bonnet up an inch or so, I think would look sh1te, but if you could direct a cold air type feed to blow across the top of the engine bay think you could be onto a winner!
    (The main principle would be similar to a fan blowing across a heatsink, only airflow is the fan and the engine the heatsink)
     
  29. Dazboss

    Dazboss Like A Thristy Dingo ;)

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    Welly, love the pic. Whats even better is i love the fact you have labelled the CAR, i was wondering what it was lmao.
     

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