Aquaduct wrote:Bikes run at higher rpms than cars meaning there needs to be substantially faster processor speeds ... [[That's 200 calculations per second]] ... and that translates to $$$.
I realize this was probably the least important of what you said, but 200 c/s is pretty piddly.
You can get a modern Apple computer that will do 1 Billion c/s, and the 'next-gen' video game systems are planned to do as many as 1 Trillion c/s.
And considering that the chip would be part of a dedicated FI system, that makes it even less needy of a powerful chip.
Telesque wrote:[
I realize this was probably the least important of what you said, but 200 c/s is pretty piddly.
You can get a modern Apple computer that will do 1 Billion c/s, and the 'next-gen' video game systems are planned to do as many as 1 Trillion c/s.
And considering that the chip would be part of a dedicated FI system, that makes it even less needy of a powerful chip.
But here I am, babbling.
Oh sure, but try to get your Apple to work in a 130 degree F ambient in a blinding rain covered in a 1/4 inch of road gunk.
And actually the term should have been "event" instead of calculation, since the whole system (including ignition) needs to be constantly adjusted so there are many calculations involved. And the operating chip itself is usually not the limiting factor. Doing the calcs is easy. Getting all the right numbers is hard.
Aquaduct wrote:
Well, first off, fuel injection involves a lot more than just a chip. The injector mechanism itself is far and away a more complex bit of mechanism than any carburetor. .
Fuel injection must calculate the proper amount of fuel for each combustion event based on engine speed and load, operating conditions, ambient conditions as well as target emission levels, etc, throughout the operating map. For a 4 cylinder sport bike at a relatively moderate 6000 rpm, that's 200 calculations per second, or 1 precisely metered fuel event every 5 milliseconds or thereabouts.
I design engines for heavy trucks, so I don't know motorcycles that well, but I can think of a couple reasons why bikes have been slow to adopt fuel injection.
Hi Aquaduct
Thanks for the detailed response. Some interesting facts there.
Cheers
Richard
Hud
“Man has no right to kill his brother. It is no excuse that he does so in uniform: he only adds the infamy of servitude to the crime of murder.”
Percy Bysshe Shelley
Telesque wrote:You can get a modern Apple computer that will do 1 Billion c/s, and the 'next-gen' video game systems are planned to do as many as 1 Trillion c/s.
do i detect a mac fan? gotta love the macs
stick a g5 in a super bike that would be pretty cool hehe
Aquaduct wrote:
Oh sure, but try to get your Apple to work in a 130 degree F ambient in a blinding rain covered in a 1/4 inch of road gunk.
that would be fairly easy actually. the cpu doesnt need that much space at all, the newest mac mini shows how small a complete system can be. the size needed for a stripped down board with the silicon on it in a bike would be no thing at all. probally fit it behind the gauge cluster very easy without needing any added space. cooling it wouldnt be a problem with high flow open air around to be used for free. water and all the rest isnt a problem for the digital gauges as they are now so.... the software is another issue.
Last edited by iwannadie on Sun Jun 05, 2005 8:29 am, edited 1 time in total.
