Skog07 wrote:KUN26.
Delivering cooler diesel increases performance of the fuel is more dense at a cooler state. Im not sure if the fuel pump recirculates through this cooler as when something is pressuried it also heats up.
It sort of works in a similar way to the intercooler for the turbo. The turbo pressurises the intake air which heats it up and causes it to expand. The intercooler cools it after to turbo to increase the density of the air to give better performance for the same boost pressure...
I dont know if you have noticed it but can you tell the difference between running your hilux on a stinker of a hot day the compare it to how it runs on a cool night..
I dont know if I have explained it properly some others may be able to chime in.
Cheers
Skog
Spoke to a diesel mechanic RE this one, its actually to cool the fuel returning to the tank. Due to the heat generated by the pressure in the common rail, the fuel/diesel in the return line needs to be cooled.
Maybe cooler diesel would give better performance but in the case of the Hilux, its to cool the return fuel (diesel/peto).
Your dead right on the summer Vs Winter performance. I guess for those those of us that dont have performance chips, just think of the difference as the extra ponies you get in winter versus the sluggish D4D on a 40 degree day. I imagine that the "chipped" D4D performs nicely on a 0 degree morning.