Is EFI totally altitude compensating?

[sarpy]

When I got my first EFI, I was told I'd never have to think about jetting and mixtures again no matter where I ride. I do however, still notice that it's got a lot more down and 3000 that up in the hills. But I've never burned her up riding in low elevations with the 1000. Big question is, once I installed a boondocker box, does that take all the automatic altitude compensating capabilities from the factory system?

If so, it would be easier to unplug the boondocker and just ride.

 

[Sledbrain2]

I am not sure what you are asking. I have had 3 AC efi sleds, all battery less. Have ridden them from 1200 ft to 12000 ft. It burned the same according to the spark plugs in all 3. I have not run a boondocker box or other compensating box. I guess some one that has run one could give you some better info. Like do you have to re-adjust settings when you go up in elevation or have a temp change. I am going to assume that once you get it dialed in at your home elevation that it should be good as you go up. I could be wrong. It you have a stock sled I do not think you will gain much with a compensator.

 

[smoothdawg]

All sleds have more power down low as compared to higher elevations. More air down low. Your Boondocker box will not affect your sled's altitude compensation features. However your mods may need more or less fuel based on your elevation so your stock fuel mapping will be wrong. So you might need a couple sets of #'s saved in your Boondocker box depending on your elevation. A stock sled with the addition of only a Boondocker box would adjust fine with altitude, however a modded sled would not. That's why guys run EGT's and or A/F gauges to monitor what the motor is doing. Hope this helps

 

[05snopro440]

Using a boondocker box on a completely stock sled is also a waste of money.

Like smoothdawg said, you lose power as you go up, that's the way it works. The only way to get around this is to run a turbo (same power at all elevations). Unplugging your boondcker will put the fuel map back to stock which will not work if you sled is modded. Your sled will still compensate for altitude with the box hooked up.

 

[ItDoAble]

Let me take a shot at this .. if I'm wrong, let me know.

The ECU adjusts for altitude/pressure, but the BD box does not. So, the stock map will adjust for altitude and bar pressure, but the 'added or subtracted' BD box amount is fixed and will not automatically adjust for different conditions. Therefore, the need for several BD box maps at different altitudes. The more mods (higher BD numbers), the greater need to have maps for changing altitudes.

Am I assuming this incorrectly?

P.S. I also understand the new Attitude programs tie into the sensor and auto adjust for altitude?

Sorry to hijack ...

 

[bigjb]

The BD box adjusts the signal that comes from the ecu so you are correct that the BD box dose not adjust for altidude pressure, the ecu does that. Since the BD box does its thing after the ecu does its thing, the bd box is making its adjustments from a signal that has already been compensated. Hope that makes sence, that's just the way I understand it works. If you have mods like twins they are more sensitive to altiude and temp so you will need to have different maps set for those conditions where as the single pipe set ups don't seem to be as sensitive as the twins are.

 

[sarpy]

I do have twins. This is the only mod. I'm hoping that a fatter (but runable) boondocker map in the mountains will be safe for the flats. No egt's, and it sucks to pull the plugs!

I can feel fat, but feeling lean is more difficult for me!

 

[bigjb]

It would help to know what your set up is, mods, elevations you're riding at. I run a fat map in lower elevations and for the road ride up the hill and once I get up there I load a leaner map. The right fueling makes all the difference.

 

[smoothdawg]

I am of the opinion if you are running aftermarket pipes on an M1000 without egt's or an A\F gauge you are just asking for trouble. Buy a set of egt's and then once you get a baseline established you will know where you are at and can adjust your box accordingly. It's a whole lot less expensive and frustrating in the long run.

 

[RockyMtn.Kris]

I am of the opinion if you are running aftermarket pipes on an M1000 without egt's or an A\F gauge you are just asking for trouble. Buy a set of egt's and then once you get a baseline established you will know where you are at and can adjust your box accordingly. It's a whole lot less expensive and frustrating in the long run.

x2