CLT & MAT not the same before cold start - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to   Members

MEGAsquirt A place to collectively sort out this megasquirt gizmo

LinkBack Thread Tools
Old 10-24-2014, 10:54 AM   #1
Senior Member
Thread Starter
Join Date: Nov 2012
Location: Israel
Posts: 543
Total Cats: -298
Default CLT & MAT not the same before cold start

CLT =24C
MAT = 18C

I believe calibration is in order, what values should I use ?
If all is right I should see the same temp when cold before start - right ?

elior77 is offline   Reply With Quote
Old 10-24-2014, 11:31 AM   #2
Elite Member
DNMakinson's Avatar
Join Date: Jan 2013
Location: Seneca, SC
Posts: 2,707
Total Cats: 269

I think better than 6C, yes. But, realize that it takes a long, long time for CLT to actually get to ambient temp, so that fact that it is higher than AIT does not guarantee that one is wrong. If, however, the AIT was higher than CLT, something would definitely be wrong.

The way to calibrate is to remove the sensor, put it into a temperature chamber and get resistance readings at, say -40, 20, and +140C (not needed to go that high on AIT). Then put in the actual, measured values under Tools in TS, and write to MS.

The trick, of course, is access to the equipment.
DNMakinson is offline   Reply With Quote
Old 10-24-2014, 11:37 AM   #3
Junior Member
Join Date: Sep 2009
Location: Bergen, Norway
Posts: 129
Total Cats: 12

Not necessarily, since the coolant has a high thermal capacity it will change its temperature more slowly than the general ambient air temp affecting it.
It should be slightly warmer in the morning, but colder than ambient later in the day.

Edit: Too slow...

Last edited by lassi; 10-24-2014 at 11:38 AM. Reason: Too slow
lassi is offline   Reply With Quote
Old 10-24-2014, 11:40 AM   #4
Boost Czar
iTrader: (61)
Braineack's Avatar
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792

which one is closer? alter the bias of the other to move it in line.
Braineack is offline   Reply With Quote

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 59 12-15-2017 09:00 PM
Expected intake temps on the track? tazswing Race Prep 20 10-03-2015 12:04 PM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 AM
Leaky Wilwoods mx592 Suspension, Brakes, Drivetrain 1 10-01-2015 01:45 AM
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM

Thread Tools

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

All times are GMT -4. The time now is 02:11 PM.