I've been looking at the 2010 TE250 and TXC250, and the 390HSBRG. Can someone please explain to me: what needs to be done to the EFI before its really ready for competition? These two brands seem to be very different. One comes with two or three "maps", and the other (if I understand correctly) can be infinitely tuned like you would re-jet a carb. Is any of this items that the owner can do? Or do both require special electronic tooling? What is "closed loop" vs "open loop"?

Mike,

I have the 390. Bergs brand new on the floor have a california lean setup with the fi. All dealers remap them to the 09 fi settings before they leave the floor. This is for the FE's the FX comes with the 09 setup standard. The bergs are no longer closed loop and people are telling me they weren't really for the 09. But I know definitly the 390 isn't for 10. Basically the difference is with open loop the fi is programmed with a set of parameters it then measures things like temp humidity altitude and probably a bunch of other things. It uses these measurements to deliver the fuel mixture into the engine. On closed loop systems it's exactly the same except that like the husky it has a 02sensor in the exhaust that measures mixture after it's burned in the cylinder to make sure it's as good as it can be. If it's burning to rich or lean the closed loop adds another layer to making the mixture going into the engine better. The berg has 3 defined settings. It comes stock in the middle. It's perfect. If anything I'd want the adjuster for the softer settings for a run like speedsville last year. Where it's just wet and nasty.

M

Open loop runs of a set of predefined parameters. The parameters are the fuel curve (jetting) and the Ignition curves) Open loop may use some of the O2 data for minor adjustments to a predefined map.

Closed Loop systems also have a predefined map but it is broader. The systems adjusts the ignition and spark maps for optimum performance. It will use data based on Temperature, Manifold Pressures (altitiude and barametric), RPM, O2 (air/fuel).. I would assume that rpm, temperature and 02 would be the main sources of data used in a dirtbike.

Having a few curves like Soft Med Hard or Traction, Normal, Fast are all that is needed. Having a system that would adjust to the basics would be a big plus in our race areas..

I did hear Mike L mention that the Bergs can get remapped with a different curves.

Full disclosure--I do not own a FI Husky, but I read about them, like, all the time on CafeHusky.com and TT. The Huskies have a competition mapping that is activated when you install the "power up" parts, which come with the bike. The competion map is very good, however some folks like to adjust the FI with the "ibeat" software, especially the off-idle response. For $300 or so you get a special cable and software to run on a laptop computer. It lets you adjust some of the FI's settings, but it doesn't give you total control over the maps. It does, however, let you tune to taste very easily.

Check out CafeHusky--they have several threads going about the new FI Husky 250s and there's lots of info there.

Like Dave said the mapping that gets done when you do the power up kit is easy and clean.. In the kit you get 3 end pipes for the silencer.. one for the ECO bike(std) one for competition and one for race w/ spark arrestor.

Each one could and will cause a different feel without changing the mapping areas.

We are on the competition mapping with the S/A tip in.. Rips and gets everywhere fast... and will not change anything til the motor brakes in... kind of like peeing in the wind changing settings to a motor that is getting stronger every ride.

I race the FX450 Husaberg. The EFI setup on all the Berg's is almost exactly the same. The Berg EFI is also infinitely adjustable if you order the equipment from Husaberg. Then you unlock the system and void the warranty. The Berg is race ready right from the dealer. No adjustment to the EFI is necessary. Many guys are buying the mapping switch which is $50. It allows you to switch from stock to soft to aggressive modes on the ignition/efi. The aggressive on the FX450 is very, very fun. The soft is too soft for me but I like a lot of pull from my bikes. Stock is just fine too. I will probably race it in the stock setting on most of the east coast, tighter events and use the aggressive mode for GNCC type stuff.

Love the Berg after having raced KTM"s since the mid 90's. The Berg just turns incredibly. LOVE IT!!!

And another option(which I will be doing sometime on my 08 TE250 which is EFI) is instead of iBeat, get a power commander V and autotune module(lowest price I've seen is about $533). This will allow you set the target AFR and it will automatically tune the fuel mapping as you ride. With a switch you can then set a base map for performance and switch to autotune when you need fuel efficiency.