I purchesed my 2005 CBR600RR in PA almost a year a ago. It has been amazing since I got it. Great power curve all around. Straight power wheelies in 1st and 2nd and easy stand ups is 3rd and 4th. Now to the real problem....

I moved to Denver, CO about a month ago and finally got my bike delivered out here. After a month of waiting to get to ride in the Rocky Mountains I finally got my chance today.

Let me tell you I was EXTREMELY disappointed! my bike is running like ****. The power curve is pathetic. this thing is gutless. I seriously struggle to bring the front end up 1st gear. forget about 2nd gear and where I used to EASILY do 3rd gear stand ups on back roads in PA with no effort I could do nothing in Denver. The only reason I'm talking about wheelies so much is because it gives all of you an idea of how gutless this bike is right now.

OK so here are some facts.

Stock setup on bike
PA elevation: 1400
Denver elevation: 5000+
miles in PA: 5500
miles in Denver: 60

I know this is related to the lack of oxygen in the air. But.....

Do you guys think the EFI will eventually compansate? I have put on about 60 miles and have noticed no significant improvment.

What the hell am I going to do? Am I going to have to buy an air intake, exhaust and PC just to get this bike to run like it should?

Anyone else in high elevation have similar issues?

 

yo liljoec. I was in Laramie WY last year about another 2k above you and my car ran like crap my rc car ran like crap my buddys truck did to but his snowmobile ran great. Had an R1 motor in it. So there is definatly a way to get that bike motor going again. Im not sure what you need to do but I no that since the air is thinner your volume metric efficientcy is at a lower percent. For cars forced induction will help. I think its for every 1000 ft you loose 3% of your Hp. So you are down 15%. Your best bet is to go find a local bike shpo and let them know whats up. They may even have a Map for your situation.

 

NOchknstrips is exactly right about the 3% for every 1000ft. So going with the 15% loss at your altitude, your bike should be puting 90hp to the rear tire, give or take. Now for the worse news, the EFI has almost certainly already compensated for the altitude. As I understand it, EFI optimizes the fuel/air ratio for given atmospheric conditions, e.g. altitude and CANNOT return your lost horsepower all by itself. To the extent of my limited knowledge, the only device capable of compensating for lost horsepower do to altitude is forced induction, i.e. turbo/supercharger.

Now for the somewhat better news. I've read in several places that our bike are "jetted" lean from the factory, so a Power Commander may indeed return a few of your lost ponies. As for the combination of intake, exhaust and pc being able to return the 15 lost horsepower I have my doubts, but it will help. Should you decide to go with any modifications, I'd be very interested in knowing which combination you go with and what the results are, you see I live in Cheyenne Wy. (6000ft +) and feel your "altitude pain".

 

I would -1/+2 your sprockets, get a full exhaust and PC then Dyno tune your bike at a shop. That would be my route.

 

I went out riding again today. still not too much better. I guess I may have to do some mods just to get the bike to run like it used to. Damn how disappointing is that?... Anyway, thanks for the insight. I havent decided if I'm gonna keep it past until next year anyway. It all depends on what honda decides to do with the 2007 RR

borachitono!... you have some guys up there to go ridding with? I need to find some guys in Denver to go riding with. Maybe I'll see you around some day

 

I hear ya mjflagg, those are definitely things that I would like to do if they werent so expensive. I would have liked to do those regardless of how the bike is running in Denver. but now I would be spending that kind of money just to get the bike running like it did stock. that sucks. oh well. I have some decisions to make now. thanks for the advice

 

Im not sure if Honda still does this but back when they had carbuerator bikes they put different needles in them depending on where the bike was being sold in the country based on elevation. Now I know you have a fuel injected bike but im just saying Honda may tune bikes differently for bikes goin to those high elevations. Maybe check with a dealership around there and see if they know anything.

 

good call basket. thats exactly what I was gonna do today. I have no idea if there is anything they could or would be willing to do about it.

 

So does that mean if I'm 5000ft below sea level, I will gain 15% more horsepower? lol

 

less air density should mean u need less fuel flow to the engine....so i dont know if they can lean it out but i would think thats what needs to be done.......thats how we do it in recip engine aircraft