Hi Folks,
About two years I got a "performance chip" from Accelracing in the UK. The 0-60 mph time improved by about 0.3 to 0.5 seconds (can't remember what it was though) and the car felt less hesitant sometimes, but over time I felt the car was was not as happy as I remembered. The exhaust is looking sooty, and the plugs are a bit darker than I'd like.
Anyway, I thought I'd check the mpg I was getting these days, and was a bit startled to find it was low 17s. On one run I checked with the car already warmed up, filled the tank and raced around some nice roads at more than 50 and less than 100 mph for 25 miles or so, and refilled. I got 17.52 mpg. Bummer.
Today I changed my chip back to the Porsche standard, warmed her up, then filled up, raced around pretty much the same roads at pretty much the same speeds, for 28 miles. I got 24.98 mpg on the refill. She does seem a little slower sometimes, but hells teeth, I think I'd rather have a 42% fuel saving
I'm going to lever the injectors out tommorrow and send them off for cleaning, and see what happens with a new air filter, a bit of AFM cleaning etc.
best regards
Rissole