My name is Jeff, I am Canadian from the west coast of, and am living in Costa Rica. I have owned a 2004 Hyundai Terracan for one year now and enjoy tinkering on it. I am curious if anyone here might know what the stock turbo manifold pressure should be? And if adjusting the pump will bring the turbo pressure up at all and in turn, will that increase fuel mileage? Thanks, Jeff.

welcome to the forums jeff (IMG:style_emoticons/default/00000732.gif) ...l am moving your post over to the 'terracan' forum for a better response from other members

Dear Hobbycar,

I don't know the stock turbo manifold pressure, but I can answer your fuel mileage question. Intuitively when you increase the air volume flowing through your engine with a fuel management system that attempts to continuously adjust to the stoichimetric fuel/air mix, your fuel mileage will decrease with higher boost levels.

Byron

Thanks Byron. I was thinking that because my car is quite heavy, and the engine is only a 2.5 Turbo diesel, with the pump set at factory specs, the engine struggles a bit on hills. So, if the pump was turned up a bit, and the actual engine torque was higher, hence more power and following that, more turbo pressure, perhaps the engine could climb the hills a bit easier with the resultant throttle position less deep into the pump and therefore, better fuel mileage. Just a theory. Thanks for your reply. Jeff.

Montego...thanks for your welcome, great to be here. Jeff.

Hello,
I took my 2.5 turbo diesel Terracan, manual five speed, to a fuel injection shop yesterday to enquire about factory spec turbo pressure. The mechanic hooked up a turbo pressure gauge and we went for a test drive. I asked before we went for the drive, what the pressure should be and was told that it should come in between 8 and 10 psi. During the drive the gauge was showing 11 psi, so I'm assuming that my turbo is doing all it can. Jeff M.