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TPS calibration
Posted: Sun Apr 16, 2006 1:37 pm
by 280xtz
I am installing MS v2.2 board with the relay board and the flyback board in my 78 280Z. I am using the TPS from a 91 300ZX, it has both the switch and pot type TPS in one package. I got the signal, return and 5V ref connected so that it reads correctly as the throttle is increased, but the calibration tool in Megatune v2.25 is giving me 13% - 85% rather than the 0% to 100% I expected. Is this normal or do I have a problem.
Thanks in advance,
Cliff Wagner
Posted: Sun Apr 16, 2006 1:51 pm
by Gavin Williams
The calibration feature is just for the gauge in megatune. As long as the open and closed positions are within the range of the tps its fine.
Posted: Wed Apr 19, 2006 2:23 pm
by oughtsix
Are you using the TPS calibration tool? With your foot off of the pedal (closed throttle) click the "Get current reading" button. Then with the pedal floored (WOT) click the other "Get current reading" button. Megaquirt then automatically does the 0% to 100% conversion for you.
Tps cal
Posted: Fri Apr 21, 2006 2:23 am
by 280xtz
Exactly my point, the cal tool in Megatune does not do a 0-100% cal, it gives me 13(15) to 85%. This can not be just an indication on the gui...otherwise how does the processor identify idle (0%) and wot (100%)?
Posted: Fri Apr 21, 2006 4:28 am
by FoundSoul
When using speed dnesity the CPU doesn't care so much about throttle position-- just throttle changes for AE. And truthfully you can do MAP based AE and run without a TPS.
If you were running Alpha-N that would be different as TPS is used to calculate load. For speed density it isn't. MAP is.
As for your calibration issue I had a customer that built up a board this week and mixed up some parts... I think he put the wrong diode in D12. He had a very similar issue where he'd calibrate his TPS but then it wouldn't go the full range, just from like 30-70%. He looked over the board, found his mistake, fixed it, and now his TPS calibrates properly. Just a thought....