Thread: two intercoolers

must be a stupid sugestion, nobody has responded!!

I too am looking into this atm

I am going to lean towards water/air intercooling when I get around to it, Bigger core surface would make it work better but at what cost to the flow, also only really works past 40k on the road and not much in the slow section

Another inline IC would be the preferred way to do it, a 2nd stock IC would just reduce flow and probably increase lag.

D2 td5 ? Just up rated single cooler.

Get sizing wrong and you get too much lag. To small and you don't get the optimum cooling.

If you could fit the two intercoolers in parallel with a 'Y' piece on each side to split and re-join the airflow then the overall result would be less resistance (less pressure drop) and slower airflow through inside which would increase the cooling time, effectively working like a single larger cooler.

If you put them in series then again you would again double the time that the air is passing through the inside of the coolers so it would reduce the final output temperature but it would also increase the flow resistance and cause a greater pressure drop so less pressure in the inlet manifold.

Overall, both would improve engine performance but connecting them in parallel would certainly be a better option. Assuming of course that you can find space to fit the second one where it can get a good external airflow and not be vulnerable when off-roading.

Not quite they wouldn't.

Having an Intercooler capacity too large in volume increases turbo "lag" as you compress more air into the space before it reaches desired pressure.

Optimising cooling capability of the unit (internal fins etc) and optimum volume will give optimum performance.

Originally Posted by VM_Motori

I too am looking into this atm

I am going to lean towards water/air intercooling when I get around to it, Bigger core surface would make it work better but at what cost to the flow, also only really works past 40k on the road and not much in the slow section

Water/air has a whole extra insulating layer in it compared to air/air and that reduces the effectiveness. They are only worth it if you have major headaches fitting the hoses to a front mount air/air.

I was quoted about $500 to fit a larger intercooler to my D1 300Tdi some time ago. The fuel pump also has to be retuned, apparently. Its on my 'bucket list'.