Thread: how hot?

so what size intercoolers are people running ?

Originally Posted by incisor

so what size intercoolers are people running ?

1103.9TDI had a nice water to air intercooler built at a joint in Brendale, well i didn't see the end product but it sounded good and the company seems to know what were on about

Originally Posted by incisor

so what size intercoolers are people running ?

Mine is about 100mm thick, by 300mm long by 200mm wide and is air/water. It resides in a box in my garage where it's been for the last two years.

It's on the list and is kind of necessary if you're running the 20psi that I am.

Originally Posted by isuzurover

Just so I understand...

this heating you mention due to inefficiency is unrelated to adiabatic heating?

That is correct, it is addition heat.

The compressor efficiency has to be accounted for.

If the compressor is operating at an efficiency of 75%, then 75% of the mechanical energy from the turbine is being used to compress the air and approx 25% is added to the charge air as heat energy (some of the 25% will be dissipated into the engine bay).

75% is good. When the turbo is not a good match, or the boost is increased such that the compressor operates in a less efficient region it can be ugly.

inc when I get round to installing the new cooler for big red (next service in 10K Km ish) you can have the old one for the suzi. If you want it.

and don't loose track,
if you need to intercool it, you need to supply air flow to the intercooler.
just wacking one in doesn't solve the problem.
think about airflow when driving and puttering and stationary, and do you need to fit cooling fans to cool the inter cooler.
basically, just do what the manufacturer of your desired system did and copy it.

Originally Posted by Dougal

If you're running 15psi boost, around 105C.
If you're running 20psi boost, around 135C.

To fit in with the recent thermodynamics lessons.
The above temperatures I've quoted are based on a 70% efficient compressor and your air intake being at 20 deg C.

I've measured turbo outlet temps at 105C in a healthy T25 at 15psi and close to 150C in a sick IHI (dust eroded compressor blades).