DIY Stock MyVi & Alza 1.5 Heat Shield

johnsonlam

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johnsonlam

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Nov 17, 2003
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My family car is an Alza. I drive it weekends to fetch whole family of 3 generations to meals and shopping. My Parents + my sister + my son... It's a great economical car... trust me, it is very valued for money.

However, I realized driving on hot weather, aircon is not as cold and the engine is sluggish. A little peek under the hood, the answer was revealed.

The Air box intake pipe is in the engine compartment and it is sucking hot air from inside the engine bay. I guess this design is from Japan where during winter, it is taking warm air to prevent throttle body from freezing.

Also realised that the Aircon piping are HOT on both the H and L pipings as soon as I cut off the engine for around 5mins.


Checking my garage, I found this piece of heat shield I took out from my EvoX's Open Pod Heat Shield project. It's a industrial plastic material used widely for advertisement boards. It resist heat well and will not melt easily. (It survived 3 months in a Turbocharged engine)

Here's the picture of the heat shield in place. Just slot it in after you cut it to shape. I was very lucky as it is the same shape as the design I traced out for my EvoX project, only thing is in the Alza, I only use exactly half of it.
Do ensure that the heat shield had some curved front part towards the grill to help scoop cold air into the intake compartment.
Cable tie it to keep it in place... However I find it already fitting tightly and perfectly.

A closer look. The heat shield nicely compartmentalize the hot area from the Intake area and the Air Con piping. The intake pipe will only be sucking in cold air and fresh from this part of the engine bay

-----

Did a 30 KM drive after this DIY. The difference is felt by everyone in the car. Car accelerated smoother and easier after traffic light stops. Air Con cools down faster and have to turn the thermostat down a little...

Raya is coming and many will be traveling and traffic jams will be unavoidable. Try this little DIY that will give you and your family a more comfortable traveling experience (also to give a little power to your car instead of sucking hot air)
 

cvkit17

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cvkit17

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Great diy...I like to see modifications that saves energy and fuel, and also improve efficiencies of systems. I did mine too but its not a heat shield haha...I just insulate the box using trocellen PE Foam + aluminium sheets. Great idea you have there.
 

johnsonlam

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johnsonlam

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Any material which is heat resistant can be used.

But since this DIY is to use easily available and cost saving material, these Plastic boards available in Stationary shops and book stores works very well.
 

cvkit17

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cvkit17

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I did this on my myvi too. And to have a better barrier between two sides, I used what's left of my PE foam to improve the thermal resistance.

1. Measure the size and cut the plastic panel accordingly...bought it in A4 size for RM1.90


2. Using acrylic double sided tape the PE foam with Aluminum cladding is sticked to the plastic panel




3. The shield is installed and tightened with cable ties.




Result: After driving for approximately 20km, I felt the heat from each side is very different. While I do not know how much it would help, I do know that the shield works as expected. :biggrin:
 

error0024

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error0024

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Wow very useful! bro thanks for sharing this method.
One question, about the part where you did covered it with aluminium part also. The piping.. I mean usually will have water droplets for the aircond one. Got any effect if cover that area?
 

cvkit17

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cvkit17

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Wow very useful! bro thanks for sharing this method.
One question, about the part where you did covered it with aluminium part also. The piping.. I mean usually will have water droplets for the aircond one. Got any effect if cover that area?
That's the air cond condensing pipe.. Insulate it. Confirm you will feel the difference.
 

Izso

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Izso

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me2kimi - doesn't the hose get heated up with the extractor being so close by?
 

vr2turbo

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vr2turbo

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Never really looked into my wife's SUV engine bay for any mod. But that day battery konk and went to make claim as the Century Ultramax is 21 months warranty and konk at 17 months. When open hood, spare part shop mentioned battery very hot, so while letting it cool, I checked out the engine bay and found the radiator fan actually blowing directly at the battery and air intake is just next to it. Looks like need to do some heat shield after reading this post....:biggrin:
 

cvkit17

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cvkit17

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Never really looked into my wife's SUV engine bay for any mod. But that day battery konk and went to make claim as the Century Ultramax is 21 months warranty and konk at 17 months. When open hood, spare part shop mentioned battery very hot, so while letting it cool, I checked out the engine bay and found the radiator fan actually blowing directly at the battery and air intake is just next to it. Looks like need to do some heat shield after reading this post....:biggrin:
I still got some PE foam if you want some