It can't. You need it or a baro sensor.The 50's Vett's did not have EFI.

 

Who said it doesn't have a map sensor. Yamaha calls it a "intake air pressure sensor" which is the same idea as a "manifold absolute pressure" sensor smartypants! That is how it compensates for altitude by measuring air density.

 

in a atv with a carb, the thinner air on a mountain causes the jetting to be lean, i dont know which, and coldness makes jetting lean. if a new exhaust also makes jetting leaner. why cant efi make the jetting right with an exhaust, when it can make it right in the cold. efi doesnt need to be adjusted, unless its not really efi. how do you adjust efi anyway, usb ports and computer program? or some kind of cable that hooks up to a computer or something? does the lt-r450, kfx450, or ds450 and other racers with efi need to be adjusted on efi when it gets piped

 

As a matter of fact, Captain Quint said it. I quote "The problem is that the EFI systems being used on ATVs are very, very rudimentary. They cannot adapt to changes in things like exhaust and intakes without changes to the ECM mapping in many cases..."

SO, read the entire thead.

 

your question was about the ecm's capability to adjusting to altitude changes not the addition of aftermarket exhaust or intakes. or at least that was the specific post i was responding to. we all know that if you ad these aftermarket accessories you need to add a controller to remap or adjust the fuel curve. But as explained before, the Yamaha is able to adjust for altitude because it has a MAP sensor. it does not have the o2 sensor though, and that is why we need units like the Vortex, Dobeck, PCIII etc.

I read the entire post mr. attitude

 

You have a frighteningly simplistic view of how EFI works. But, consumers like you drive the aftermarket electronics industry.

You should try doing the math some time on how much, percentage wise, air mass changes from sea level to 5000 ft. Then do some math about air filters.

 

Safari, not all EFI systems compesate for everything. Case in point, Ford Mustangs. The older EFI engines had what's known as "Speed Density" systems while newer ones have "Mass Air" sensors. The speed density EFI system does NOT compensate for engine mods very well at all. You have to upgrade to the Mass Air system in order to compensate for better ported heads, bigger cams, etc. I'm not going to pretend to be an expert, but I do know these were EFI engines that could not respond to engine modifications.

 

An intelligent comment from an educated point of view. I can respect that.

Good thing we're past the 'old days'. VW used to use mechanical fuel injection with electronic support, but not any more. The old 280Z Bosch fuel injection was crap, but it was incredible for its time.

In the futuristic present, we shoudn't be debating what does and doesn't. There shouldn't be a need. WHY whould Suzuki go BACKWARD in technology, with an incredibly simple task of fuel injecting a single cylinder engine. Suzuki knows fuel injection, they should stick to what works. Does anyone here think that you can't drive your XL-7 or whatever over the Rockies because it can't handle 8000 ft? For the money we're spending, and the SUPER CHEAP cost of an EFI system, it shouldn't be anything but GREAT.