Hi Ecomodders!
I have installed vacuum gauge in my car Skoda Felicia since there is only old ODB version and I'm unable to use SG.
VG works like a charm so far but I have a few questions about optimal range of vacuum during acceleration.
I have found BSFC chart for my car. It's chart for 1.3L MPI engine (50kW):
So from this chart it looks like the less fuel I burn if I'll accelerate with 100% throtle between 2300-2700 rpm, so for my car on selected gears it will be:
Gear ---
Speed for 2300 rpm ---
Speed for 2700 rpm
1 ------- 10 mph (17 kph) -------- 12 mph (20 kph)
2 ------- 19 mph (30 kph) -------- 22 mph (35 kph)
3 ------- 28 mph (45 kph) -------- 33 mph (53 kph)
4 ------- 38 mph (62 kph) -------- 45 mph (72 kph)
5 ------- 50 mph (80 kph) -------- 58 mph (93 kph)
And here are a questions
- how should I accelerate to use less fuel? Start from 10 to 5 In/Hg and then when I get during acceleration 2300 rpm press throtle little more?
- what numbers should shows me my vacuum gauge when I will be between 2300-2700 rpm, should it be 10 to 5 In/Hg or maybe 5 to 0 In/Hg?
I've also noticed that this engine burn less fuel (I'm not 100% sure but the vacuum gauge shows then 19-18 In/Hg) when I'm doing 30mph on 3rd gear (about 2600 rpm) than on the 4rd gear (about 1900 rpm) (then vacumm gauge shows about 16-15 In/Hg) on the flat road and with steady foot.
Thanks,
Peter.