PCM Diagnostics & Tuning HP Tuners | Holley | Diablo

VERY negative LTIT+STIT, Huh???

Old Oct 18, 2005 | 11:34 AM
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Default VERY negative LTIT+STIT, Huh???

I am use to reading about postive LTIT+STIT being used to adjust Base Running Airflow... I just logged mine and got VERY negative results.. Along the lines of -8.0 through -11.0 (g/sec), from 89 degrees through 225 degrees ECT (f).

Someone double check me on this; I am adding my logged LTIT+STIT and then multipling them by 7.58 to convert them from pounds/min to grams/sec... Right???

Fans were turned off for this log..


Last edited by SideStep; Oct 18, 2005 at 11:50 AM.
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Old Oct 18, 2005 | 12:31 PM
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I think I found the problem...

I created a custom PID, I was using this formula:

(LTIT+STIT)*7.576 = my Base Running Airflow error (g/sec)

I changed to this formula:
LTIT+STIT*7.576 = my Base Running Airflow error (g/sec)


Notice the "*7.576" in both, this is where I was converting the result to g/sec manually... BUT HPtuner 2.0 does that for you just select the "Unit" type for output, which I had and I got the crazy results...

I am weak

Last edited by SideStep; Oct 18, 2005 at 12:51 PM.
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