Printable View
Is anyone using a thermal wrap on the Turbo or any other methods for trying to keep the temp down under the bonnet?
I know a lot of the Integrale boys like to partition off the air filter area to ensure that the engine draws in cold air, but has anyone done anything similar for the Q4 and if so have you seen a difference?
Same goes for the turbo wrap as well, although I'm not a big fan of thermal wraps as they can trap moisture and increase corrosion.
Steve
Steve, I think that the turbo blanket things that you can get are great - they keep the heat in the turbo - not the engine bay. But they are expensive...much better than any 'wrap'. Ceramic coating works great for the headers/extractors - but its really only practical with stainless steel exhausts - and its also expensive.. also much better than any wrap!
I also have a heat shield between the headers and the fan...
http://www.driftworks.com/forum/part...o-blanket.html
jim.
I'm not a fan of wraps either, they break down fairly quickly and, as you say, cause corrosion :?
Have you thought about ceramic coating for the manifold?
Bonnet vents... :lol:
Edit: No idea about the turbo wrap....surely dissipating heat from the turbo is a good idea???
wrinx
If I were to be getting a new manifold I'd get it coated for sure. I guess from a reliability point of view taking the heat away from the turbo would be best to stop the oil in the turbo from coking up. But from a power point of view keeping the gasses as hot as possible and therefore as expanded as possible is best until they leave the turbo, then cool them down so they take up less space in the exhaust.
As for bonnet vents, not keen on letting rainwater in at the top of the engine, and I'm not convinced about how effective they are. The bonnet tends to be a high pressure area as the air is squashed as it tries to get over the car, so might not allow as much of the hot engine bay air out as you think it would.
The often quoted example of this is the Nissan Sunny GTiR rally car, slightly different set of circumstances as the intercooler for the engine is mounted on top of the motor.
They found that when running in night stages with a lightpod on the bonnet they got a performance boost as the pod created a low pressure spot over the bonnet vent increasing air flow over the intercooler. As a result they ran the car with the light pod even in the daylight.
I've got ceramic coated mainfold and guess what happend todayQuote:
Originally Posted by wrinx
damping mat under the bonnet directly above mainfold started to burn
a lot of fire and smoke,
fortunately had fire extinguisher and sorted this out very quickly, almost no damages under the bonnet exept the mat.
so ceramic coated is for sure not enough... or damping mat was really in bad condition,
what do you think about this?
how to protect better engine bay and keep away heat
wrap on mainfold? turbo wrap?
anyone using above setups ?
best regards
Do you mean the sound deadening mat that is fastened to the underside of the bonnet?
I've never heard of that catching fire before, but I've removed mine just in case. What manifold do you have?
I'm not a fan of manifold wraps as they can hold moisture and cause accelerated corrosion.
I've thought in the past that it would be a good idea to have a central vent in the bonnet, similar to the integrale to allow some of the hot air above the Turbo/manifold to exit the engine bay.
You can remove two sponge (left-right) and the engine area will refresh with cold air
Just make gold shields for the space between what gets hot and what doesn't want to be :D
Quote:
Originally Posted by 1NRO
Like a McLaren F1 :driving-014:
Also goes to show how important it is to have a fire extinguisher in the car. I always make sure I've got one to hand.
took some picturesQuote:
Originally Posted by Steve Webb
http://i44.tinypic.com/t7omq1.jpg
take it out away
http://i44.tinypic.com/20hwv84.jpg
zoom
http://i43.tinypic.com/2akcvg9.jpg
cooked bonnet (or especially for my friend hood)
http://i39.tinypic.com/ncdxme.jpg
ceramic coated stainless steel mainfold
http://i40.tinypic.com/2yozi3q.jpg
and cleaned bonnet(hood) - not too much damage at all - luck
http://i41.tinypic.com/m78adj.jpg
of course i have checked tooday in same conditions and the bonnet is now very very hot :), so it must be protected somehow
i've ordered aluminium matt to replace the old one, hope it will help for now.
it's required by the law in Poland to have one in car, otherwise you will not pass the yearly MOT.Quote:
Originally Posted by Steve Webb
regards
Lucky escape!
I always carry an extinguisher in the Q4....can't think why :lol:
wrinx
Sorry, but I don?t think that wraps will hold moisture, not if the car is periodically run (please, no jokes with Q4+peridically+runing)
Very true Juan, but in the UK and other parts of Europe, the climate means that the engine bay gets damp even without the car moving, if the manifold is wrapped, the wrap will absorb the moisture and keep it damp even after the rest of the engine bay has dried out.
Oh and Suzu, if you remove the two foam parts that are pointed out in the pic below, it should help airflow through the engine bay.
It's understandable and it's safe, Wrinx.Quote:
Originally Posted by wrinx
I have a strange feeling too when thinking at electric part. I don't like surprises.
Also, when my Q4 remains in garage for few days or more I use to disconnect the battery. Is this allright with the electrics (ECU, etc..) ?? Thank you!
Cheers,
C.
That looks very familiar.Quote:
Originally Posted by Suzumushi
I hhave had the same problem with the isolation under the bonnet.
Though it looked very nice in the dark when it happend :biggrin:
Also very very hot..... :redface:
Thanks Steve for an idea, done it already and some temporary solution to protect hood below.Quote:
Originally Posted by Steve Webb
http://i41.tinypic.com/dxlidv.jpg
and in the near future i want to make some vents in the bonnet, but first i will get spare one for cutting and welding tests :)
<edit>
some interesting infrared photos
http://i43.tinypic.com/1zlavz9.jpg
http://i39.tinypic.com/4ruuyv.jpg
http://i42.tinypic.com/scfe3k.jpg
http://i39.tinypic.com/ymb1s.jpg
http://i41.tinypic.com/e0hauw.jpg
http://i41.tinypic.com/invnko.jpg
regards
Were those thermal images taken after you had been out driving the car?
Its interesting to see on the shots of the bonnet how hot the area just above the plenum is. Looks like it is nicely warming the air that has just been cooled by the intercooler.