dealer says carbed f7 will naturally outperform efi. i'm not necessarily agreeing. what do you guys think?
Good points, efi does not compensate to the point that most think it does. A properly jetted carb will run better on warm days however neither can get the good combustion with the air density. On average though I would say that efi is the way to go for 90% of the riders. Quite often when we go riding for the day it may be - 25 when we leave get upto -10/-15 and then be -30 by the time we get back. If you wanted to stay in the same ball park with a carbed sled and be on the ragged edge that would require 2 trail side jettings. The efi will always be in the ball park. In short the efi will be closer on average with zero work. You can get the carb closer at any point in time but due to temp changes it will not likely stay that way long. Plus you have to worry about that safe zone on long wfo pulls across the lake or steady throttle trail riding if you have messed with the needles. Also a large part of this is dependant on where Cat puts the map and they are being less conservative as time goes on. A few years ago they would ahve never dreamed of mapping the f7"s mid where it was.Originally posted by morrisond@Mar 11 2003, 11:05 AM
I have an F7 and I would have to diagree on it's ability to compensate for all conditions. This past weekend sled felt very RICH on a day around 0C but was much better the next day when temps were about -12C. There is a reason for this. Although the temps were diff and the efi can compensate for this, the density of the air was radically different. With the air being more dense on the cold day the EFI worked better. Cat's EFI does not have a mass airflow sensor (which cars have) which would make the necessary correction. The CAT EFI simply takes a temp reading and reads the amount of fuel off a table, it does not adjust for density, hence it can feel different depending on conditions. With a carb, even though you have to do some work, you can account for this.