hot starts, lean at idle - Page 2 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MEGAsquirt A place to collectively sort out this megasquirt gizmo

Reply
 
 
 
LinkBack Thread Tools
Old 02-10-2014, 11:07 AM   #21
Senior Member
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default

Quote:
Originally Posted by Braineack View Post
you have MSI?
MS2 Microsquirt N76
ScottyP3821 is offline   Reply With Quote
Old 02-10-2014, 12:52 PM   #22
Elite Member
 
DNMakinson's Avatar
 
Join Date: Jan 2013
Location: Seneca, SC
Posts: 2,704
Total Cats: 269
Default

I have it too, but I'm still NA and my AIT is on front side of stock, rubber elbow, just after the filter box, so it sees all radiation from radiator. Of interest is JasonC SSB's newest comments on injector dead time changing with temperature. Me... I'm hoping that my problem goes away when the AIT is located on FMIC cold tank, but it sounds like ScottP is still having an issue.

Last edited by DNMakinson; 02-12-2014 at 11:02 AM. Reason: Had "Jacob", rather than "JasonC"
DNMakinson is offline   Reply With Quote
Old 02-10-2014, 01:06 PM   #23
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,892
Total Cats: 1,792
Default

Have you tuned your MAT corrections?
Braineack is offline   Reply With Quote
Old 02-10-2014, 03:12 PM   #24
Senior Member
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default

Quote:
Originally Posted by Braineack View Post
Have you tuned your MAT corrections?
Yup. First I tuned it to stay at 100 and then added to try and cure hot restart but with to much mat (115 GAIR) I run pretty rich and still lean on hot restart.
ScottyP3821 is offline   Reply With Quote
Old 02-10-2014, 04:11 PM   #25
Senior Member
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default

I think I am going to play with my ASE. Thats the only think I can think to change. Maybe crank them up to tune out the hot restart then change my WUE so Im not running pig rich on warm up.
ScottyP3821 is offline   Reply With Quote
Old 02-17-2014, 12:56 PM   #26
Senior Member
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default

Increasing my ASE didnt help much really if it all.
ScottyP3821 is offline   Reply With Quote
Old 02-17-2014, 02:25 PM   #27
Elite Member
 
DNMakinson's Avatar
 
Join Date: Jan 2013
Location: Seneca, SC
Posts: 2,704
Total Cats: 269
Default

It should help, while it's activated. The problem with using it as the sole solution is that the time of the heat soak varies per driving conditions, and will not help stop-and-go heat soak.

Overall, I totally agree with setting the ASE for each cold condition's first 30 or so seconds (to keep from having cold take-off stumble) and letting the WUE take care of the rest of cold conditions. The WUE wizard seems to assume this as well, as it seems to target the curve to the AFR and no extra enrichment.

But, you would have been adding the ASE at high temps, rather than low, and the WUE would already be off.

Is your AIT in front of the radiator?
DNMakinson is offline   Reply With Quote
Old 02-17-2014, 04:18 PM   #28
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,892
Total Cats: 1,792
Default

If MAT corrections keeps Gair at 100%, then how are you going lean?

What would be causing you to not have enough fuel?

post a datalog of it.
Braineack is offline   Reply With Quote
Old 02-17-2014, 06:13 PM   #29
Senior Member
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default

I will data log it. Its not AITs my GAIR is always above 100 and my IAT sensor is right after the intercooler in direct air flow.
ScottyP3821 is offline   Reply With Quote
Old 02-17-2014, 11:18 PM   #30
Newb
 
Join Date: Jun 2009
Location: Dallas, TX
Posts: 17
Total Cats: 0
Default

Nvm. Found it

Last edited by whizbang18T; 02-18-2014 at 08:48 AM.
whizbang18T is offline   Reply With Quote
Old 02-18-2014, 11:28 AM   #31
Senior Member
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default

Lean restart log attached. Just ordered a new fuel pump and will change the fuel filter at the same time as my 190 hp comes in from lightning motorsports. Not sure if that will help or not.
Attached Files
File Type: msl Lean.msl (333.9 KB, 49 views)
ScottyP3821 is offline   Reply With Quote
Old 02-18-2014, 08:13 PM   #32
Elite Member
 
DNMakinson's Avatar
 
Join Date: Jan 2013
Location: Seneca, SC
Posts: 2,704
Total Cats: 269
Default

Is it really 100* in Texas? Your CLT is only 160, but your MAT, at the intercooler is showing 100. When the AFR first starts reading, you are OK, but as the ASE tapers out, then car goes lean. If the AIT sensor is lying (heat soak), then this can make sense, even with the 1.8% correction, depending on the total MAT corr curve.

The other thing I see is that the VE table is going from 42 to 47 as the idle control valve moves to hold the RPM (VE changes with MAP). I wonder if that area could use more tuning, in particular, the lower KPa having the VE raised.

Last would be, in conjunction with above, injector dead time. If smaller than actual, then very small changes in pulse width can cause high error at idle.
DNMakinson is offline   Reply With Quote
Old 02-19-2014, 10:35 AM   #33
Senior Member
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default

My iat sensor is right after the cold side. I have adjust my MAT correction table so it reads around 103%

I'll adjust my ve at idle more but idk how the hell I would still be heat soaking. If I up my GAIR I'll just run even more rich.
ScottyP3821 is offline   Reply With Quote
Old 02-19-2014, 12:31 PM   #34
Senior Member
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default

My other worry is say I crank up IAT correction then Ill run rich as ****. So then I run VEAL and tune my idle, then It will go back to still having shitty hot starts. It will just be chasing its tail.
ScottyP3821 is offline   Reply With Quote
Old 02-19-2014, 05:15 PM   #35
Elite Member
 
DNMakinson's Avatar
 
Join Date: Jan 2013
Location: Seneca, SC
Posts: 2,704
Total Cats: 269
Default

I wouldn't change MAT for idle, and I wouldn't allow VEAL to adjust VE in the idle area. If the hot restart is an idle issue only:

1) I would manually increase idle area VE cells.
2) Allow EGO to control AFR at idle
3) Tweak idle VE so that, under normal conditions EGO is pulling about 3% at idle, and at hot restarts EGO is adding about 3% at idle.

Do not change MAT so that the entire VE table is wrong under some conditions. Rather MAT correction should be so that the majority of the VE table is correct over changes in AIT (MAT).
DNMakinson is offline   Reply With Quote
Old 02-19-2014, 05:42 PM   #36
Senior Member
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default

I've done that before with no sucess. I guess I will try it again and make it more aggressive. Thanks for all the feedback and answers.
ScottyP3821 is offline   Reply With Quote
Old 02-20-2014, 10:50 AM   #37
Senior Member
iTrader: (2)
 
Join Date: Jun 2012
Location: New Braunfels,TX
Posts: 1,141
Total Cats: 51
Default

So I made it much more aggressive in the EGO settings. I got it to go to 15.7-16.1 on restarts with no idle surge then with the tap of the throttle drops in to the 14s. Once down the road car stays in the high 13s at idle. I do not have seq injection. Now I need to tune WE cause its very rich warming up but that should be easy. Thanks for the feedback David props to you.
ScottyP3821 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
Project Gemini - Turbo Civic on the Cheap Full_Tilt_Boogie Build Threads 58 12-13-2017 10:04 PM
Back to Stock Part Out!! Turbo Parts, MS2 Enhanced 01-05, Suspension, and MOAR! StratoBlue1109 Miata parts for sale/trade 16 10-02-2015 10:39 AM
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
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 AM


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 07:47 PM.