tsiklonaut Posted January 20, 2016 Report Share Posted January 20, 2016 (edited) Anyone knows if there's a high altitude (2000-2500 meters+) EFI map available for TRi? Edited January 20, 2016 by tsiklonaut Quote Link to comment Share on other sites More sharing options...
canada280i Posted January 20, 2016 Report Share Posted January 20, 2016 Never heard of one, but don't think it is necessary as the efi system should adjust automatically for air pressure and outside temps 1 Quote Link to comment Share on other sites More sharing options...
tsiklonaut Posted January 20, 2016 Author Report Share Posted January 20, 2016 Never heard of one, but don't think it is necessary as the efi system should adjust automatically for air pressure and outside temps You're sure it measures the pressure too? To my knowledge it's just the temperatures (air and engine), but since 2-strokes have no Lambda-sensor feedback from the exhaust for mixture adjustment thus they cannot adjust for the high altitude (this must be done via proper re-mapping?) Quote Link to comment Share on other sites More sharing options...
jimmyl Posted January 20, 2016 Report Share Posted January 20, 2016 "/cartography/images/everest/everest_1925" That's a high altitude map Sorry couldn't resist it. Quote Link to comment Share on other sites More sharing options...
tsiklonaut Posted January 20, 2016 Author Report Share Posted January 20, 2016 (edited) "/cartography/images/everest/everest_1925" That's a high altitude map Sorry couldn't resist it. LOL, a good one. Fixed it to "EFI maps" now or should I spell this out for you too? Edited January 20, 2016 by tsiklonaut Quote Link to comment Share on other sites More sharing options...
steve_earle Posted January 20, 2016 Report Share Posted January 20, 2016 Why not ask the Ossa factory direct?..................................................................................... 1 Quote Link to comment Share on other sites More sharing options...
ric h Posted January 21, 2016 Report Share Posted January 21, 2016 You're sure it measures the pressure too? To my knowledge it's just the temperatures (air and engine), but since 2-strokes have no Lambda-sensor feedback from the exhaust for mixture adjustment thus they cannot adjust for the high altitude (this must be done via proper re-mapping?) Yes,there is a sensor for the pressure. Quote Link to comment Share on other sites More sharing options...
tsiklonaut Posted January 21, 2016 Author Report Share Posted January 21, 2016 Yes,there is a sensor for the pressure. Yep, spot on! While it's not marked in any specs I found some nice OSSA EFI info here. Basically OSSA has built their own version of closed-loop EFI via pressure sensor (most EFIs use Lambda (O2-) sensor for mixture instead), hence it should adapt the correct mixture according to altitude. Case closed. Quote Link to comment Share on other sites More sharing options...
steve_earle Posted January 25, 2016 Report Share Posted January 25, 2016 A pressure sensor doesn't make it closed loop or even close to behaving like a closed loop system, It will only measure negative pressure similar to a Maf sensor. Without a lambda sensor to measure the state of compustion, the ecu is only guessing the fueling. Having said that a properly mapped Ossa is fantastic, I really like these bikes, I've ridden a really good one mapped by Cambs Trials. Enjoy it while parts are available!!! Quote Link to comment Share on other sites More sharing options...
tsiklonaut Posted January 26, 2016 Author Report Share Posted January 26, 2016 Anyone tested their EFI OSSAs on high (2500+ meters) altitudes? Quote Link to comment Share on other sites More sharing options...
lotus54 Posted September 19, 2016 Report Share Posted September 19, 2016 (edited) Not exactly on topic- but does anyone have an explanation on what the different maps that are available do? Some seem self-explanatory, but others that have things the ++ at the end. Perhaps the 'road' 2nd map is extra rich? Edited September 19, 2016 by lotus54 Quote Link to comment Share on other sites More sharing options...
elemetal Posted September 20, 2016 Report Share Posted September 20, 2016 Anyone tested their EFI OSSAs on high (2500+ meters) altitudes? We have two events here in the Sierra's at 7,500 and 7,800 ft (about 2,500 meters+) and a couple more at 5,500 ft (1,800 m); ridden the OSSA 280 at most of them and the power is down slightly, idle is lower but the rest of the behavior is fine. So much so I never thought too much about the elevation. The vertigo has a special map (#4) for high altitude but I forgot to run it this last weekend (7800 ft). Ran pretty good on map 1 but I wish I would've remembered #4, heard it ran great on that. Quote Link to comment Share on other sites More sharing options...
dadof2 Posted September 21, 2016 Report Share Posted September 21, 2016 I was on a bus recently at about 11,000 ft. the bus had no problem, the cars and motorcycles had no problem, only the cyclists looked a bit knackered. If the Ossa can't cut it with these mundane everyday vehicles it just about says it all about 2T EFI. Quote Link to comment Share on other sites More sharing options...
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