Ozzy
Needs a job
need guberment cheese
Posts: 3172
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posted August 08, 2002 12:28 PM
Why does the ecu have to know what gear the bike is in?
With so much idle time on my hands right now I have been thinking. (scary in itself!)
The oem ecu is told what gear the tranny is in.
WHY??
Does it select the map according to the gear?
If so then the power commander can only be accurate for one gear.
Has anyone ever picked just one output wire, for example 3rd gear and spliced it to all 6 of the other wires? In essence tricking the ecu into thinking the bike is always in 3rd gear.
If so, what effect did it have?
I ask this because my bike seems to run better in 4th 5th 6th then in the lower gears with the map I had in it.
Thanks,Ozzy
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"It's 106 miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and we're wearing sunglasses......HIT IT!"
Blues Bros.
  
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zx11_12
Expert Class
Posts: 207
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posted August 08, 2002 12:37 PM
 Edited By: zx11_12 on 9 Aug 2002 03:44
I'm certainly no expert, but I always thought that the ecu needed to know what gear the bike is in so that it can account for the ram air effect when determining how much fuel to deliver. It can read the rpm's and the gear, which tells it the speed and thus the amount of ram air effect.
As for the power commander, you may be right in that if you calibrate it on a sationary bike, it will be lean on top due to the extra air coming in due to the ram effect. However, the ecu is already richening the mixture up to allow for this, so I don't think it would be too lean. As I understand it, the power commander adjusts what the ecu is sending by a percentage basis. So the ecu is still calling for an enriched mixture at higher rpms. Unless your power commander is programed to counteract this ( a possibility if it was done on a stationary dyno) the mixture should still be getting slightly richer at high rpms to allow for the extra air.
Does that make any sense at all? It does inside my head, but I don't kow if it came out right.
Steve
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"There is only one basic human right, the right to do as you damn well please. And with it comes the only basic human duty, the duty to take the consequences."
PJ O'Rourke
 
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swft
Needs a life
Full throttle!
Posts: One MEEEEEELLION
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posted August 08, 2002 05:59 PM
Supposedly, it's for a different FI map for each gear. Which goes right in to what zx11_12 was saying...
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Zx23rr
Expert Class
Mahogany Bomber Pilot
Posts: 242
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posted August 08, 2002 09:24 PM
And also possible ignition tables. No one has explored this possiblities. Having the A/F monitor hooked up at least lets me know and adjust the pc3r to a good ball park. On another note, hazard to guess-the 30% larger ram air on the 02 allows for more air to pass when stationary, but will hurt airbox performance at speed.
It would be nice to see all the maps of a stock ecu. Plus, all the dyno runs that have been done may have a variable not account for-like what gear it is in. Just a thought.
Later................................../
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Ozzy
Needs a job
need guberment cheese
Posts: 3172
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posted August 09, 2002 06:40 AM
I was under the impression that the baro sensor in the air box measured any ram air effect by comparing the readings between that sensor and the sensor mounted in the tail section. If indeed it actually does this then what gear was selected should not matter reguarding the map/ram air pressure. I am with zx23rr, I think that the ecu is mapped different for the upper gears and that accounts for some of the differences in dyno readings. A while back Lube posted about his bike pulling harder in the upper gears, something I too have noticed, or at least thought it was puling harder. It would be nice to see Kawi's maps for the 12r.
Swft have you ever made back to back dyno pulls with a bike and just used a different gear for each pull?
____________
"It's 106 miles to Chicago, we've got a full tank of gas, half a pack of cigarettes, it's dark, and we're wearing sunglasses......HIT IT!"
Blues Bros.
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Zx23rr
Expert Class
Mahogany Bomber Pilot
Posts: 242
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posted August 09, 2002 08:03 AM
I was going to route 1st and 2nd to the third gear, and I have wired 5th and 6th to 4th gear. I very unfortunately haven't been able to due a top run yet. But it does feel different. I will have to try the 1 & 2 to 3rd gear. Or maybe I'll put 1st gear to 2nd for starters. Has anyone tried any of this and any feed back. I would really like to get Ricky's 12 pre-production 2000 ECU!!
PS- In regards to top speed fun - my provincial/state government has gotten very nasty as of late. They have now given the tax collectors the right to yank your licence on the spot for 2 years. They have given the officer the task of becoming crown, judge and jury all in one second. Of course now if one is going 40 kms plus over or "racing" with your buddy in some deserted place, he/she can ruin your life with one phone call to the superintantant of motor vehicle. This of course makes one re-think ones action. Before, for the most part, I would pull over and pay my road tax and carry on. Now I am not so sure.
Later............................../
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MikeM
Novice Class
Posts: 49
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posted August 11, 2002 04:46 AM
Another reason for ECU sampling gears ?
If the ECU compares the ambient air pressure and air box air pressure to produce a value for use in calculating ram air affect could the gear sensor be being used as to provide data to allow the ECU to act as a form of traction control/anti - flip device? If the fuelling and ignition curve is slightly "softer" in 1st gear (and getting progressivly more aggressive so that by, say, 3rd gear the engine is at max performance) is this the big K's way of assisting damage limitation. If what I guess is correct then would putting the feed from 3rd gear into 1st, 2nd and 3rd produce max accelaration from standing start?
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