Thread: Intercooling versus other?

Does a 12v fan on the intercooler make a difference at low revs?

Or as Lokka suggested - Water to Air Intercooler

Isn't the 4BD1-T in trucks set up with a pipe from turbo to inlet plenum directly over the rocker cover? No intercooler there.

Probably end up running higher EGT under constant high boost.

When intercooling an engine not designed that way, you need to keep in mind a couple of things. Intercooling results in a cooler, denser air charge. To take advantage of this you need to add more fuel. Cooling the charge air results in a pressure drop across the intercooler. If you wish to maintain the prior boost level you may need to fit a higher capacity turbocharger or supercharger, or speed up the supercharger.

That depends.
Do you spend a lot of time at high boost levels (continually above 15 psi)?
Do you have a problem keeping EGT's down?
Do you want more power?

If not, then why bother with an intercooler?
You can just keep increasing boost to reduce EGT's, but this gets counter productive as boost pressures rise. 12psi with a very good intercooler will give the same air density as 20psi with no intercooler. This makes it quite obvious that intercooled engines are more efficient than non intercooled.
Isuzu added an intercooler to their indirect injection 4BD2T, but even with the intercooler it was 5% less efficient than the 4BD1T using their EPA figures for power and fuel injection quantities.

What turbo are you running?

if you setup the VNT properly youd be mad not to run the intercooler. the VNT tries its very best to make boost all the way across the rev range so in theory (but not quite in practice) once its running its on boost.. (most require a touch of throttle to get the exhaust pressure up while at idle) if its on boost then the intercooler is already up to charge pressure so there should be very little lag compared to not having the intercooler.

Originally Posted by Rangier Rover

I know we have a brazilian threads here on Turboing and intercooling.

My idea here is to start a discussion on is "intercooling always better" in some applications.

After rovercare drove my 4BD1T that has same Turbo as his intercooled Rangie job we have come up with the assumption the non intercooled may be more responsive at low RPM to a point. Less lag etc.
Matt is going to try a VNT set up next with no intercooler and see how it goes.
I've gone a bit cold on intercooling for a wile as the drivability of mine if perfect for what I use it for now. And is very good on fuel. Can poke about for hours in the bush and the gauge is still on a quarter.

Do we all really need the intercooler?
May be for top gear hwy performance?

Does it really make enough diference on a 4BD1T to justify the cost and lack of simplicity? (More hose's and a core to puncture etc)

Thats the reason I fitted one. For the motorway use towing the camper getting to the 4wd destination. It makes no differance off road in lo range. Dont even know how much it helps on road, but why not fit it. It cant hurt to try and cool the intake air.

Justin

Like my Namesake mentioned, I fitted my air to air front mount for the highway at 15+psi boost towing. I can feel a HUGE temp differential between inlet and outlet pipework after a long hill climb, so yes it is worthwhile in THAT application. Water to air is 4 times as efficient at heat transfer, but there is more complexity in the system due to the requirement for a form of heat exchanger and water pump etc etc. For most uses, 10 to 12 psi and no intercooler is quite adequate, at least on a 4BD1 in a Landy/Rangie.

JC

Have a look on thermoguard.com website.
They go into a bit of technical advise and are based on research.

The guy also drives a Landy and is a retailer of EGT gauges.

Cheers