MSPNP MSPNP specific Megasquirt related discussion.
Sponsored by:
Sponsored by:

Unstable idle... maybe?

 
Old 05-09-2015, 01:58 AM
  #1  
Junior Member
Thread Starter
 
Join Date: Aug 2011
Posts: 46
Total Cats: -2
Default Unstable idle... maybe?

Sorry for the noob threads and whatnot - trying to figure it out as much as I can without making new stuff.

Anyways, I can't seem to get a stable idle (at least compared to stock) and not sure if its because the tune I have or if this is just normal. Also should note that my wideband reads normal up until 15.5 ish afr and then MS reads differently than the gauge (AEM UEGO). It's powered from 12v radio and grounded to MSPNP2 pin 5.

Thanks in advance for help. Should also note that in logs, while cruising, real AFR is around 16.2-17 and creeps back and forth between that.

Files were to large for mt.net so its linked via dropbox
https://dl.dropboxusercontent.com/u/...urrentTune.msq
https://dl.dropboxusercontent.com/u/...urrentTune.msl
pikachukiat is offline  
Old 05-09-2015, 10:59 AM
  #2  
Boost Czar
iTrader: (62)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 76,361
Total Cats: 2,294
Default

thats too lean to idle. aim for 14-14.5:1
Braineack is offline  
Old 05-10-2015, 11:02 AM
  #3  
Junior Member
Thread Starter
 
Join Date: Aug 2011
Posts: 46
Total Cats: -2
Default

Thanks!
Is idle rpm only affected by VE tables? I was fiddling around with closed loop idle settings and ended up making the car run at 5k rpm on start up.

Also still having problems with TS and WB agreeing with each other. On idle they both agree and at 4k rpm with no load they agree, but when I start going on the highway, things start to get out of sync at cruising speeds. Bad ground or is the calibration off?

Thanks again all
pikachukiat is offline  
Old 05-11-2015, 03:00 PM
  #4  
Newb
 
Join Date: Aug 2014
Location: Connecticut
Posts: 33
Total Cats: -3
Default

Try using the same ground for the wideband that the Ecu is using. That will help eliminate the issue. Sometimes you have to use the custom calibration in MS instead of just selecting the wideband you have to get it to read correctly in MS.

Also like brain said your AF ratios are pretty lean, you should add more fuel. I found that my car like to idle best in the upper 13's/ lower 14's and cruise in mid 14's.

You can add an extra column before your idle cells (i have 600rpm) so that MS can use that to bounce off of. Ms is reading more than one cell at a time so getting the surrounding cells tuned right will help you have a stable idle

Timing is also huge for achieving a stable idle. An extra column here before your actual idle (around 600rpm) will help the iding of the car and also help with idle droop when you get off the throttle
Backwoodsballer is offline  
 
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Frank_and_Beans
Engine Performance
26
10-02-2013 11:57 AM
devgru38
Engine Performance
10
06-01-2013 06:16 AM
Braineack
Engine Performance
310
07-29-2011 10:22 PM
ZX-Tex
Adaptronic
66
09-14-2010 10:01 PM
rippledabs
DIY Turbo Discussion
5
06-12-2008 01:47 AM


Thread Tools
Search this Thread
Quick Reply: Unstable idle... maybe?


Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

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.