Niose On Coolant Temp And Air Temp?

quattrodave · Post by **quattrodave** » Mon Jul 10, 2006 2:05 pm

Hiya,

Just been going through a log and i noticed that i appear to have noise on the coolant temp and air temp. Could somone confirm this?

If it is noise, how would i go about solving it?? I'm using MS 2 V3 with the recomended GM sensors.

Many thanks

Dave

mops · Post by **mops** » Mon Jul 10, 2006 2:31 pm

what I noticed is that both CLT and MAT is heveily dependent on battery volrage. if you have spikes there you will have spikes in temp readings. and temp sensors should be grounded to main ms ground for stable readouts. It is absolutely crucial.

BottleFed70 · Post by **BottleFed70** » Mon Jul 10, 2006 5:32 pm

I took a look at the datalog and if it is noise then it's only effecting your temp readings by less than 2* (less than 1* in most cases).

This is so minor I wouldn't even bother worrying about it..

mops · Post by **mops** » Mon Jul 10, 2006 6:44 pm

well, I looked at my datalogs, and at 14V MAT reading is ok, while at 10V (durning cranking) MAT reading shows about 20 deg C more. When i plotted the batt and MAT graph on one screen that I noticed very strong corelation between two.
just my .02

BottleFed70 · Post by **BottleFed70** » Mon Jul 10, 2006 9:54 pm

mops wrote:well, I looked at my datalogs, and at 14V MAT reading is ok, while at 10V (durning cranking) MAT reading shows about 20 deg C more. When i plotted the batt and MAT graph on one screen that I noticed very strong corelation between two.
just my .02

Hmm.. interesting findings. If I understand the temperature circuits correctly they use a 5V reference provided by the voltage regulator. In theory you should not see any problems until battery voltage drops below 6V.

quattrodave · Post by **quattrodave** » Tue Jul 11, 2006 12:05 am

Nice one cheers guys for the input.

Dave