Sequential injection
Discussion
you can have individual cylinder trimming though if needed, and if you have a rapidly accelerating engine, or a rapidly changing load you can have injectors in sequence supplying different fuelling as the conditions change quickly. It's not what the OP was getting at, but daz almost stubled across it accidently ..
v8 racing said:
Daz its more for fuel economy rather than power, you can cut the fuel to certain cylinders on cruise to give really good fuel economy, so at say 70 mph you can cut off 6 cylinders and run somewhere close to 50mpg
Is that similar the Dodge Hemi which automatically runs on four cylinders on light load .If Dave knew about this he would not of needed the LPG conversion ..
Does that mean a probe is needed from each exhaust port ..
I do stumble a lot in life
but get there in the end .Edited by SILICONEKID343HP on Wednesday 28th August 20:40
v8 racing said:
Daz its more for fuel economy rather than power, you can cut the fuel to certain cylinders on cruise to give really good fuel economy, so at say 70 mph you can cut off 6 cylinders and run somewhere close to 50mpg
Right up your street that then Daz .....get the mpg your constantly searching for...
AIUI, engines that shut off cylinders at light load don't just switch off the fuel.
If they did that, you wouldn't get as much of a benefit as you'd think, because the "dead" cylinders are still sucking in air and blowing it out again, which wastes energy.
What they do is have a clever system that keeps both valves permanently closed on the dead cylinders. So instead of drawing in air and pushing it back out, the pistons are constantly compressing the same charge of air. On each downward stroke, the compressed air helps to push the piston down, so a lot of the energy required to compress the air is recovered. It's not 100% efficient due to heat loss, but it's better than the alternative.
If they did that, you wouldn't get as much of a benefit as you'd think, because the "dead" cylinders are still sucking in air and blowing it out again, which wastes energy.
What they do is have a clever system that keeps both valves permanently closed on the dead cylinders. So instead of drawing in air and pushing it back out, the pistons are constantly compressing the same charge of air. On each downward stroke, the compressed air helps to push the piston down, so a lot of the energy required to compress the air is recovered. It's not 100% efficient due to heat loss, but it's better than the alternative.
Yes whilst sequential would allow you to cut individual cylinders or more I'm not aware of any aftermarket ecu that we would use that would allow it, though some traction control systems do work like that. Running sequential does allow you to time the injection pulse on light loads so that you only inject when the inlet valve is open, so tidying up emissions and giving a slight benefit in economy, but most people agree it's mostly a waste of time unless you're chasing the last %
sometimes with the Japanese its .... "because they can" or for Honda "what if" 
v8 racing said:
Daz its more for fuel economy rather than power, you can cut the fuel to certain cylinders on cruise to give really good fuel economy, so at say 70 mph you can cut off 6 cylinders and run somewhere close to 50mpg
Is this a 'switch on the dashboard' affair Rob? Like having two maps you can switch between?Gassing Station | Chimaera | Top of Page | What's New | My Stuff