mantis007
Novice Class
Posts: 28
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posted February 03, 2003 03:39 PM
FI Question
if I understand it correctly the 12's FI cuts fuel at 5.5K RPM and above at 0 % throttle. My bike bucks quite a bit if I'm in that range and let off/on the throttle. Isn't there anything that can be done about this so that the FI doesn't cut fuel till much higher in the rpm range? I have added lots of fuel from 0% and 5.5K up but it doesn't help much. I would think Muzzy's or someone could devise something to fix this???
thanks for any suggestions/help
Tony
  
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TurboBlew
Moderator
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posted February 03, 2003 03:56 PM
Do you have a mechanical timing advancer?
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mantis007
Novice Class
Posts: 28
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posted February 03, 2003 04:07 PM
yes a Muzzy's set to around 4-5 deg and a full Hindle.
Thanks
Tony
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TurboBlew
Moderator
BUSY DOING THE SCHIAVO
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posted February 03, 2003 05:21 PM
Is the bike geared at all?
Did you try taking some timing out?
Personally I ride around with less than 5000 rpm. Perhaps staying out of this range will at <10% throttle?
Is the bike mapped?
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Y2KZX12R
Needs a job
CompetitionCNC.com
Posts: 3762
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posted February 03, 2003 06:40 PM
Mantis, I'm sorry to say but there is no real fix for this that I've seen yet short of replacing the ECU with a Muzzy unit or similar.
I had been working on a "backfeed" type system that would parallel the signal to the injectors but I started a large project in september and couldnt devote the time to fully develop the system.
I believe the reason the ECU does this is for the EPA. I can see no other reason they would do such a thing.
Some people have over fueled the maps so that when the injectors cut back in, the power comes on "soft" and you percieve it to be "fixed".
Cliff Randal first sugested this as a fix for this problem back in july of 2001 or so. While it is a bandaid to the problem, and it might stop a highside, its not a proper fix. But preventing a highside is the best reason for doing it.
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Tearinitup
Expert Class
VP Code Monkey
Posts: 298
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posted February 04, 2003 07:46 AM
You could move your tp sensor to trick the ecu into thinking that you don't ever completely close the throttle. The injectors shouldn't ever go off then and you could use a Power Commander/Yosh EMS to fix the rest of the map that you just messed up by doing that.
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mantis007
Novice Class
Posts: 28
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posted February 04, 2003 08:50 AM
 Edited By: mantis007 on 4 Feb 2003 17:28
I have a 17 front and stock rear. I like the idea of adjusting the TPS - what do ya think I should move it too? The bike was mapped by Kevin Cadby at Mild to Wild(he did an excellent job BTW).
Thanks for the suggestions
Tony
here is my dyno on a DJ250
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kcadby
Pro
Posts: 1733
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posted February 04, 2003 04:42 PM
Thank You Sir!!! 
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ZHooligan
Moderator
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posted February 04, 2003 05:44 PM
Kevin who?  Isn't he one of the bums that hangs out here with the rest of us bums?
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