Heat Management

[Ren]

The US really do believe in these DIY CAI (ram effect) kits. Lots of threads on this!

I can't say I've heard them put in intakes on the bonnet though as they have either not find the right combo to make it worth while or just can't see any benefit as the turbo can run to extreme temps and has little impact. Not only that, the weather goes from one extreme to the other resulting in mass amounts of rain and/or snow which gets interesting! LOL

I'll let you know if anything seems reasonable, unless you have any ideas to burn and no time to play.

Dave

Originally Posted by Ren

The US really do believe in these DIY CAI (ram effect) kits. Lots of threads on this!

I can't say I've heard them put in intakes on the bonnet though as they have either not find the right combo to make it worth while or just can't see any benefit as the turbo can run to extreme temps and has little impact. Not only that, the weather goes from one extreme to the other resulting in mass amounts of rain and/or snow which gets interesting! LOL

I'll let you know if anything seems reasonable, unless you have any ideas to burn and no time to play.

Dave

This unforently shows how wrong most american's are when it comes to modding cars.

First, your never going to ram air in faster than the turbo is going to pull it.

Ok that tangent over, a couple posts back recommended one of the easiest cheapest ideas about the cowling. I just removed the weather strip, doesn't allow quite as much air to exit but still helps none the less. Nice thing is its completely reversible.

I completly agree. The 2 best area's would be to allow for air to be pulled out from above the turbo and just behind the radiator. Running the OEM heat shields over the exhaust housing/dp does make a large difference in under hood temps.

Something like florians 855 works well.


though if you look (atleast the US spec ones) EVO's, they have something similar with a baffled tray underneath to keep rain water from draining directly to on top of the motor.

[SaffronC70]

Originally Posted by DougT5R

Running the OEM heat shields over the exhaust housing/dp does make a large difference in under hood temps.

Hi, just checking . . .

Using the heat sheild makes temps cooler right ?

hehe

Chris

[SaffronC70]

Another question

The purpose of the underbonnet insulation . . .

Is this to reduce engine noise and/or protect the bonnet paint from heat ?

Can I remove it ? Or is are the risks (if any) not worth it ?

Thanks

Chris

[Pedro Fandango]

i took mine out about a year ago & theres no sign of it affecting the paint

i've also heard it could be a fire blanket to extinguish the flames

[timway]

I've noticed on mine that ambient temperature seems to affect performance quite a lot actually. Quite noticeable at the moment when its coldish in the morning driving to work (15 degrees at 7am) and hot driving back (25 degrees at 5pm)
I've tried to quantify it by timing acceleration and the increase in time to cover a given increment in speed (eg 60-80 in 3rd) can be up to 10% (so approximately a 10% reduction in power)

Maybe I need a bigger intercooler

[Pedro Fandango]

Originally Posted by DougT5R

a couple posts back recommended one of the easiest cheapest ideas about the cowling. I just removed the weather strip, doesn't allow quite as much air to exit but still helps none the less. Nice thing is its completely reversible.

i cut the mounting flange for the seal off as well to give a bit more of a gap, its not reversible now tho lol

[SaffronC70]

Originally Posted by Pedro Fandango

i cut the mounting flange for the seal off as well to give a bit more of a gap, its not reversible now tho lol

hehe, as tempting as it is in this heat, might give that a miss !

Will consider taking out the heat/noise/flame insulation in the mean time.

Chris

that reminds me, I've got a fire extinguisher to mount somewhere accessable, rather than getting out the car, going to the boot, rummaging around etc lol

[Ren]

Thanks for the replies so far guys.

I've been monitoring temperature levels on the induction side of things (nothing scientific - just the hand!) after journeys. I am still amazed how the heat soak/transfer along the entire intake system i.e. from the scoop behind the grill down the sock (american terminology) to the box. Even the plastic on my pipercross element filter is hot!

I've pulled the weather seal off for now and put it to one side so that I can put it back on when it starts to get colder in the autumn.

I am also investing in some 3" black ducting to divert all the available air from the bumper vents into the engine bay. I am also attaching the same ducting to the stock air box and loosing the original sock, although I am not expenting any difference, just thought I'd give it a go, no harm.

I've been photoshopping bonnet vents onto pictures of my car (as this saves the bonnet and cash) to get an idea of how good/bad they look. No decision yet.

Dave

[SaffronC70]

Ren, I totally agree

The heat soak of the OEM airbox system is quite high.

But there has always been an argument that OEM is best - I believe this is true in terms of flow, but not heat soak.

Have you seen my crazy induction kit I made up ?

Chris