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Discussion Starter · #1 ·
Just bought my R3 yesterday and living at altitude was wondering how effective is the fuel injection for dealing with major altitude changes? I will be riding it occasionally at sea level but mostly from 5000 ft to 10000 ft here in the rockies. this is my first fuel injected bike, my R6's ( 1999 and 2001) really suffered when going from Phoenix ( which they were jetted for) to the mountains .
On another note, If it is effective how much of a lean condition will it deal with when changing exhaust and air filter? being new to fuel injection and kinda a computer dummy I dont understand alot of the posts about remapping and such.
Thanks for any advice or comments.
 

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how effective is the fuel injection for dealing with major altitude changes?
You will have to let us know but I expect a modern engine with an O2 sensor to adapt so that it runs perfect at any altitude. If you leave it alone. Take it up to Evans or Pike's and see how it does.
 

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Thread moved to Exhaust and Fuel Delivery.

As Sendler said, fuel injected with ECU and O2 sensor will adapt to changes in barometric pressure much better than carbureted system. If you go with an aftermarket full exhaust system (ie; no cat) and 'low restriction' air filter the current thinking is that a remap will improve performance. Bazzaz or Power Commander add-on will allow remap.

FWIW - I installed both Yosh full system and Yam HP air filter and ran that set-up first race weekend out with factory map. I didn't notice any major differences in throttle response or overall performance over stock pipe/filter. I have since installed the Bazzaz unit and will remap at the track tomorrow, but still under best case I only expect to gain maybe 1-2 hp. (5 would be awesome, but not likely I think).
 

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Discussion Starter · #4 ·
Thanks for the replies , I wont be leaving it alone, I like to make my bikes personal so will fab an exhaust among other things, looks like I've got some studying to do about fuel remapping so I can lose the smog and Cat. Before it gets cold around here I will take it for a ride up Pikes Peak but not before mods are done.
Sorry bout posting in the wrong section :(
 

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Discussion Starter · #5 ·
"FWIW - I installed both Yosh full system and Yam HP air filter and ran that set-up first race weekend out with factory map. I didn't notice any major differences in throttle response or overall performance over stock pipe/filter. I have since installed the Bazzaz unit and will remap at the track tomorrow, but still under best case I only expect to gain maybe 1-2 hp. (5 would be awesome, but not likely I think)."

Thats great info, Gonna start on the exhaust tomorrow.
Thanks
 

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I'm over in Wyoming at 4500 asl. Rode it up to almost 10k feet in the bighorns and it ran like a champ. It was obvious it wasn't making as much power (but those of us up in the clouds are used to that anyways), but it was due to air density as opposed to running rich. Modern fuel injection is pretty good at compensating. My plan is to get the m4 system as well as the pcv with autotune and be done with it. Then it will continually adjust the map for the best performance with the added mods and changes in environment.
 

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OK - today's follow up:
For a stock ECU map, running Yosh full exhaust, Yam HP air filter, no smog pump, no Cali can, and at an altitude of about 4500', I was getting A/F values in the mid to low 11's (quite rich). Ran the Bazzaz data logger a couple of sessions and adjusted A/F values to mid 13's. No dyno, no lap timer and a windy day at the track, so the only indicator I have of performance increase was that my shift points were coming quite a bit earlier than before adjusting A/F values. Hopefully I can get better indications of improvements in the next couple of days when the transponder will be pinging.
 

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Discussion Starter · #8 ·
I'll be interested in the results, I installed a mid pipe and can on mine today and didnt notice much difference aside from my ears being fooled , sounds better though.
 

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Discussion Starter · #9 ·
I'm over in Wyoming at 4500 asl. Rode it up to almost 10k feet in the bighorns and it ran like a champ. It was obvious it wasn't making as much power (but those of us up in the clouds are used to that anyways), but it was due to air density as opposed to running rich. Modern fuel injection is pretty good at compensating. My plan is to get the m4 system as well as the pcv with autotune and be done with it. Then it will continually adjust the map for the best performance with the added mods and changes in environment.
I'm thinking of doing the same except for the M4, got more reading to do but it seems like the answer.
 

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OK - today's follow up:
For a stock ECU map, running Yosh full exhaust, Yam HP air filter, no smog pump, no Cali can, and at an altitude of about 4500', I was getting A/F values in the mid to low 11's (quite rich).
Why would it be so rich before remapping. Was the O2 sensor jumped or unplugged?
 
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