Noisy TPS w/MegaSquirt?

Lugnuts · 10-13-2018, 07:33 PM

Has anyone swapped the signal/ground pins on their E36 TPS to address signal noise? Trying to work out if this amount is considered normal or needs fixing (5x zoom below).

varg · 10-14-2018, 11:48 AM

I've never zoomed in 5x on a log of it, but my TPS has always been pretty noisy. The percentage dances around a bit on my tuning screen and in histogram view there's a fair amount of jumping around within a percentage point. Mine was worsening for a while and when it got really bad I opened the TPS up, cleaned it out with alcohol, and clipped off a couple of pieces of the brush that were sticking out at odd angles, calmed it right down. As long as it isn't enough noise to trigger accel enrich or kick you out of closed loop idle, it should be ok.

citizen_insane · 10-16-2018, 09:25 AM

Here's a pic of the only data log I have with me at work. (I don't have MegaLog Viewer on my computer so I'm using a different piece of software). Mine looks fairly similar, maybe a bit smoother and less periodic than yours.

kyleconstantine · 10-16-2018, 11:03 AM

mine has always been a little noisey as well....there is a smoothing factor under general settings for the tps...100% is raw signal and 10% is fully smoothed out. try adjusting that.

digger · 10-17-2018, 02:00 AM

Quote:

Originally Posted by Lugnuts

Has anyone swapped the signal/ground pins on their E36 TPS to address signal noise? Trying to work out if this amount is considered normal or needs fixing (5x zoom below).

what is the range between peak and valley?

10-13-2018, 07:33 PM	#1
Lugnuts Member Join Date: Oct 2014 Location: Straya Posts: 80	Noisy TPS w/MegaSquirt? Has anyone swapped the signal/ground pins on their E36 TPS to address signal noise? Trying to work out if this amount is considered normal or needs fixing (5x zoom below). Attached Images

10-14-2018, 11:48 AM	#2
varg E30 Mastermind Join Date: May 2014 Location: Palm Beach County, FL Posts: 1,861	I've never zoomed in 5x on a log of it, but my TPS has always been pretty noisy. The percentage dances around a bit on my tuning screen and in histogram view there's a fair amount of jumping around within a percentage point. Mine was worsening for a while and when it got really bad I opened the TPS up, cleaned it out with alcohol, and clipped off a couple of pieces of the brush that were sticking out at odd angles, calmed it right down. As long as it isn't enough noise to trigger accel enrich or kick you out of closed loop idle, it should be ok. __________________ @turbovarg '91 318is, M20B25, T3/T04E 60 trim (15psi), megasquirt, coilovers, Z3 rack, cold AC [b u i l d] [Car of the month: April 2018] Always outnumbered, never outgunned.

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10-16-2018, 09:25 AM	#3
citizen_insane Advanced Member Join Date: Jan 2013 Location: NC Posts: 136	Here's a pic of the only data log I have with me at work. (I don't have MegaLog Viewer on my computer so I'm using a different piece of software). Mine looks fairly similar, maybe a bit smoother and less periodic than yours.

10-16-2018, 11:03 AM	#4
kyleconstantine E30 Fanatic Join Date: Apr 2014 Location: NJ/Philly Posts: 1,222	mine has always been a little noisey as well....there is a smoothing factor under general settings for the tps...100% is raw signal and 10% is fully smoothed out. try adjusting that.