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Discussion Starter · #1 ·
Today I was checking out my new autotap on the lightning. Scanning though everything I notice my throttle positions only range from 23% to 92% as I actuate it.

Now since I run awfully quick for a 4# truck and it was dyno tuned as is? I'm EXTREMELY hesitant to try and adjust the TPS.

What gives? Is my TPS just out of adjustment (never touched since new)? Or is my autotap telling me bogus info?

Rich
 

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Rich

I believe I have read numerous post on this some time ago :smt017 . I DEF remember Vendors answering this question before and saying our range IS NOT 0-100%
 

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Rob_02Lightning said:
Rich

I believe I have read numerous post on this some time ago :smt017 . I DEF remember Vendors answering this question before and saying our range IS NOT 0-100%
To help out a little here, I was selling the AutoTap Units for years, but do not offer them anymore. AutoTap uses a % of the Throttle Postioning and that is all it is. The Values of the accurate settings for maximum Throttle Postion performance is between .097 to .099, by taking a volt meter and loosening the two bolts that secure the TPS Sensor to the Throttle Body and moving it upward to get the maximum readings possible, closest to .099.

Most Lightning's & Harleys come from the factory with the TPS Sensor reading between .089 and .093 off the shelf part, as these are not set from the factory, upon installation. Same as Sparkplugs installed at the factory, ranging between .039 and .053. Go figure!! Hope this helps, as the older AutoTap versions used to show Air/Fuel Ratio's to, but now only measure 02 Voltage etc.
 

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Discussion Starter · #4 ·
Thanks Terry!

One more question and I'll leave ya alone, Can a guy read the O2 volts and corrilate a A/F from that?

Rich
 

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Discussion Starter · #5 ·
Found my answer.. Thanks for the inputs.

Rich
 

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For anyone not aware, our o2 sensors are not accurate as you
move away from stoich. At wot af ratios should be well richer
than stoich, rendering the output of the o2s unreliable. For
accurate #s you need a wideband o2 sensor.(I use a Dynojet).
Jim
 

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Discussion Starter · #8 ·
Yes I can monitor voltage.

I've been reading EGTs for some time now. But only as a point of reference. I'm not sure how to relate either the EGTs or volts back to a meaningful A/F ratio. One thing I do know though.. my plugs look perfect. ;)

Rich
 
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