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SVT Shelby GT500
Kennebell throttle Body issues
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<blockquote data-quote="Willie" data-source="post: 16188797" data-attributes="member: 14133"><p>I picked up a 168 early last year. I was hesitant because of everything I read about tuning it. I tune myself, but had never attempted a mono. But I got it anyways and took on the challenge. I learned a ton, basically by trial and error and tons of datalogs.</p><p></p><p>In my case, I would see failsafe only when I lifted..... sound familiar? So I focused by datalogging the instance the throttle is lifted, and fine tooth combing through the raw data, line by line, so I wouldn't miss anything. I believe I discovered the reason. It seems that KB TB's have an issue CLOSING the throttle plates -- that it's too slow. When this happens, the commanded throttle angle deviates from the actual throttle angle beyond the maximum allowable...... FAILSAFE, and this happens almost instantaneously.</p><p></p><p>Maybe it has something to do with the brass gears as many have stated, but unless someone has the guts to try to replace them with plastic or Delron (sp?), what else can we do? My solution: I used the dashpot settings to slow down the throttle blades closing when lifting the pedal. It works. But it took countless iterations to find the sweet spot between not failsafing and an objectionable throttle response when lifting.</p><p></p><p>Willie</p></blockquote><p></p>
[QUOTE="Willie, post: 16188797, member: 14133"] I picked up a 168 early last year. I was hesitant because of everything I read about tuning it. I tune myself, but had never attempted a mono. But I got it anyways and took on the challenge. I learned a ton, basically by trial and error and tons of datalogs. In my case, I would see failsafe only when I lifted..... sound familiar? So I focused by datalogging the instance the throttle is lifted, and fine tooth combing through the raw data, line by line, so I wouldn't miss anything. I believe I discovered the reason. It seems that KB TB's have an issue CLOSING the throttle plates -- that it's too slow. When this happens, the commanded throttle angle deviates from the actual throttle angle beyond the maximum allowable...... FAILSAFE, and this happens almost instantaneously. Maybe it has something to do with the brass gears as many have stated, but unless someone has the guts to try to replace them with plastic or Delron (sp?), what else can we do? My solution: I used the dashpot settings to slow down the throttle blades closing when lifting the pedal. It works. But it took countless iterations to find the sweet spot between not failsafing and an objectionable throttle response when lifting. Willie [/QUOTE]
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Kennebell throttle Body issues
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