When is it necesarry to rescale your MAF? - EvolutionM - Mitsubishi Lancer and Lancer Evolution Community

Notices
Evo X Engine Management / Tuning Forums Discuss the major engine management systems.

When is it necesarry to rescale your MAF?

Reply

 
 
 
Old Apr 6, 2018, 06:57 AM
  #1  
Newbie
Thread Starter
 
Join Date: Oct 2015
Location: orlando
Posts: 13
Thanks: 0
Thanked 0 Times in 0 Posts
When is it necesarry to rescale your MAF?

At what point is it necessary to rescale your MAF? I was told when I installed a new intake to do it, but I just want to make sure that is logical. To me, I don't understand why you would do that after an intake that uses the same stock MAF. I thought that was if changes to the MAF were made, or upgraded to a larger MAF altogether a rescale is necessary. (ex, I just installed a new ETS intake where the MAF is after the filter)

Shouldn't a higher flowing filter simply result in the MAF reading more airflow?

Thanks for helping me make sense of this
50joe is offline  
Reply With Quote
Old Apr 6, 2018, 08:39 AM
  #2  
Evolved Member
 
Biggiesacks's Avatar
 
Join Date: Aug 2005
Location: The Bay Area
Posts: 2,629
Thanked 140 Times in 135 Posts
As far as I understand it, different intakes can create an offset in the frequency of the maf sensor. That offset causes problems that can be corrected by compensating for it in maf scaling.
Biggiesacks is offline  
Reply With Quote
Old Apr 6, 2018, 11:39 AM
  #3  
Newbie
Thread Starter
 
Join Date: Oct 2015
Location: orlando
Posts: 13
Thanks: 0
Thanked 0 Times in 0 Posts
Originally Posted by Biggiesacks View Post
As far as I understand it, different intakes can create an offset in the frequency of the maf sensor. That offset causes problems that can be corrected by compensating for it in maf scaling.
Ok I suppose that makes sense, the MAF is calibrated accurately, when used with the intake system it was designed for. Thanks!
50joe is offline  
Reply With Quote
Old Apr 6, 2018, 12:26 PM
  #4  
EvoM Guru
iTrader: (8)
 
razorlab's Avatar
 
Join Date: Aug 2003
Location: Alameda, ca
Posts: 10,894
Thanked 205 Times in 181 Posts
99% of the time only when you change the size of the actual MAF housing.
razorlab is offline  
Reply With Quote
Old Apr 6, 2018, 01:17 PM
  #5  
Newbie
 
Join Date: Nov 2014
Location: Vancouver
Posts: 50
Thanked 1 Time in 1 Post
In terms of scaling the Maf, do you guys think its more accurate to take the average trim of each maf voltage range, or would it be more accurate to filter out everything and only work with the trims at 14.7 afr and take the average of that instead, given that I am able to datalog AFR? I understand I'll have way less usable data, but would this yield a better scaling?
ossimbrian is offline  
Reply With Quote
Old Apr 13, 2018, 10:27 PM
  #6  
Evolving Member
 
Join Date: Mar 2012
Location: New York
Posts: 463
Thanked 18 Times in 16 Posts
For loads under 120 you can use a TON of logged trims. It works. You have to disable the MAP don't forget.
For WOT tuning of the upper part of the MAF curve, I posted instructions once here:

https://www.evolutionm.net/forums/ev...elper-app.html
Jaraxle is offline  
Reply With Quote
 
 
 


Thread Tools
Search this Thread

Contact Us Archive Advertising Cookie Policy Privacy Statement Terms of Service

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: