Vehicle & Technical > Defender
Standard 300tdi intercooler
Terry.J:
Has anyone played around with the airflow through a standard intercooler and got good results. At present i have moved the horn & the oval badge to the other side of the grill and have also made an angled deflection plate mounted inside the grill which helps scoop more air in from the rad side. Although i have no way of measuring any gains it does appear to be running smoother and slightly better mpg (was getting 25-26 now around 28mpg).
Next thing i am looking at trying, is to open up the fan shroud just behind the intercooler as this looks to me like it could be restricting the airflow. this mod could possibly also help cool the turbo and charge pipes.
Does anyone have any thoughts on this or other tips(i know the best thing to do would be to junk it an get a bigger one, but can,t afford it) or has anyone opened up the shroud, if so, did it help.
white90:
the shroud is there so the fan draws air through the intercooler even at offroad speeds removing it IMHO would have the opposite effect of what you are after.
if you want a bigger intercooler but don't want to spend the ££ look around a scrap yard here are loads that can be brought cheaply and modded to fit.
I have an Allisport one and with other mods/tweaks the 90 performs well and rtns 24mpg which all in all isn't bad really
as it weighs 2108kg
Guardian.:
you are not going to 'tune' your engine and improve fuel economy, my disco 300tdi goes like the clappers, bearing in mind it has 33 inch tyres also, but only does 20/21mpg.
messing with the intercooler alone will not change much, if anything, it just cools the air, the more coolair(bigger intercooler)the more fuel you can squirt in.
beware of tuning an older highmileagemotor, as everything is worn over the years / miles. when i first did mine a couple of months ago, we had it running fast, but the fuel pump blew, expensive replacement!
mmgemini:
I have an Alli-Sport intercooler fitted in place of the original.
Fuel pump optimised and new hoses.
Yep it has a nice bit of go about it.Well as much as you can expect from a Defender 110 station Wagon.
Oh yes...It returns at least 26mpg with the roof rack and top box fitted.
Porny:
--- Quote from: "guardian off road product" ---you are not going to 'tune' your engine and improve fuel economy, my disco 300tdi goes like the clappers, bearing in mind it has 33 inch tyres also, but only does 20/21mpg.
messing with the intercooler alone will not change much, if anything, it just cools the air, the more coolair(bigger intercooler)the more fuel you can squirt in.
beware of tuning an older highmileagemotor, as everything is worn over the years / miles. when i first did mine a couple of months ago, we had it running fast, but the fuel pump blew, expensive replacement!
--- End quote ---
I disagree...
On a Petrol:
A tuned engine, if done properly could actually get mpg than a non-tuned version.
When you tune an engine properly, you will increase both torque and bhp.. thus increase power levels.
Increased torques, will at times, allow you to pull a higher gear meaning that the engine is under less load and at a lower rpm. If driven carefully, this would improve mpg.
On a Diesel:
On a tuned diesel, for a given speed you will be using the same amount of fuel – but at a different throttle position.
As a broad example, if before you would do 50mph at half throttle, with a tuned diesel it might now be at 1/3rd throttle, as tweaking the ECU (or the pump) simply rescales the throttle pedal (i.e. more fuel at a certain throttle pedal position and/or at a given boost pressure)
However, obviously at full throttle it's delivering more fuel than it would have originally.
So, if you drive exactly the same speeds as before there would be no effect on fuel economy…. However, in reality you will use the extra performance some times!!! – so fuel economy will be 2 or 3mpg worse (typically)
Ian
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