justinc
14th December 2007, 09:21 PM
Had a play with fuel and boost pressure yesterday. I had reduced the fuelling for our trip in September towing to Albany, and thought I might re adjust it.
I had noticed up a particular hill I was getting up to 495 to 500 degrees (upstream) and flat throttle I could manage only about 75kmh in 4th.
I adjusted the fuel stop one whole turn out, and disconnected the wastegate altogether, effectively making it into a non wastegated unit. This results in 15psi at the manifold on full fuel. I now get about the same temps on the same hill, but I can ACCELERATE from 70 to 110 in 4th, and the difference in inlet and outlet temps is huge. I now feel my intercooler is actually working better with the higher boost pressures and air speeds, and the efficiency is consequently much better. Maybe if the hill was longer, I would get higher temps eventually?
Now to do a fuel consumption test. I had been getting between 24 and 27mpg with a mix of city and rural driving.
After the adjustment, vehicle is even more drivable, pulling well from bottom end and allowing for easy low speed 4th gear work.
One thing is also a plus. I luurve the inlet whistle through the snorkel and drive round with the passenger window down and a :D
JC
I had noticed up a particular hill I was getting up to 495 to 500 degrees (upstream) and flat throttle I could manage only about 75kmh in 4th.
I adjusted the fuel stop one whole turn out, and disconnected the wastegate altogether, effectively making it into a non wastegated unit. This results in 15psi at the manifold on full fuel. I now get about the same temps on the same hill, but I can ACCELERATE from 70 to 110 in 4th, and the difference in inlet and outlet temps is huge. I now feel my intercooler is actually working better with the higher boost pressures and air speeds, and the efficiency is consequently much better. Maybe if the hill was longer, I would get higher temps eventually?
Now to do a fuel consumption test. I had been getting between 24 and 27mpg with a mix of city and rural driving.
After the adjustment, vehicle is even more drivable, pulling well from bottom end and allowing for easy low speed 4th gear work.
One thing is also a plus. I luurve the inlet whistle through the snorkel and drive round with the passenger window down and a :D
JC