[V8] sanity check, what, from a V8Q owner?
indischrot at gmail.com
Sun Mar 23 13:23:00 PDT 2008
FOUR CYCLE?!?? But all those A4 guys run TWO CYCLE oil!!!!
LOL, my mistake. Yes, you are correct sir!
>No. On a given engine you would expect little to any mileage benefit from a
>sequential EFI system over a batch system ... the number of injectors firing
>simultaneously really doesn't have any significant impact on fuel economy.
>If all cylinders were the same and the intake charge was identical then all
>cylinders would need the exact same amount of fuel and there would be
>nothing to be gained in terms of fuel economy. The fuel injected by the
>injectors all ends up getting sucked into the cylinder and burned, it can't
>go anywhere else. Where a sequential system shines is that it can meter
>fuel to each cylinder based on the operating parameters of that cylinder ...
>modern ECUs and OXS' have the bandwidth to validate the exhaust from each
>cylinder and make compensation on a cylinder basis. That said, I bet that
>many sequential systems don't even try to match the valve timing ...
>... minor point ... the V8 engine is a 4-stroke motor, so it actually takes
>two times around for all 8 to get a power stroke ...
>San José, CA (USA)
>If only 2 injectors are firing, surely we'd get better gas mileage??
>The 944 batch fires 4 cylinders twice a revolution and still manages
>around 25-30 mpg. The V8q fires... yup.. 8 times a revolution. Two per
>90º, so yeah, bad gas mileage.
>I think someone out there has done stand-alone engine management?
>Anyone worked up sequential? I know guys in the 944 world have.
>Sequential gas mileage would (in theory) double mpg?
>Audifans V8 mailing list
>Send posts to: mailto:V8 at audifans.com
>Manage your list connection: http://www.audifans.com/mailman/listinfo/v8
>You can help keep the audifans site running by shopping at http://audifans.com/shop/
More information about the V8