High AFR on basemap MSPNP MM9093 - 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 04-18-2016, 04:27 AM   #21
Newb
Thread Starter
 
Join Date: Jun 2014
Location: Norway
Posts: 44
Total Cats: 0
Default

Quote:
Originally Posted by PendleMotorcycles View Post
Have you made sure warm up enrichment is of before starting auto tune?
Yes ofc.

The fuel table is ok tuned. So is cold-start, idle etc.

I'm still having the problem with lean hot starts! Yesterday I removed the crossover tube and started test fitting IC piping. I had the hood open and the crossover tube removed from the engine bay for two hours. The IAT is located in the crossover tube (plastic). I reconnected it and started the car. I went from 13.5 AFR on my cold start to 18 AFR. And it stays there until I start driving.

This is quite annoying. I think I added the MAT correction last yeast. Doesn't seem to make any difference (https://www.miataturbo.net/megasquir...-starts-79109/).

I've read that this is because of heated injectors. But two hours and open hood should cool them down? The drive before I stopped was just 10 minutes.

Any ideas?

Here is a log I started after I drove 20 seconds to get the AFR to stabilize. I'll log a hot start next time.
http://px08.net/mx5/2016-04-17_14.02.40.msl
My currenttune. Renamed.
http://px08.net/mx5/CurrentTune-helly.msq

Last edited by helly; 04-18-2016 at 04:39 AM. Reason: Added tune and log.
helly is offline   Reply With Quote
Old 04-18-2016, 08:46 AM   #22
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,809
Total Cats: 1,780
Default

you need to do the MAT corrections inversion table.

you log shows you're down 5-10% of fuel due to Gair.

Last edited by Braineack; 04-18-2016 at 09:06 AM.
Braineack is offline   Reply With Quote
Old 04-18-2016, 08:48 AM   #23
Newb
Thread Starter
 
Join Date: Jun 2014
Location: Norway
Posts: 44
Total Cats: 0
Default

I'm pretty sure I added a MAT / CLT correction table from one of your post. Can't remember where or how.
helly is offline   Reply With Quote
Old 04-18-2016, 08:55 AM   #24
Newb
Thread Starter
 
Join Date: Jun 2014
Location: Norway
Posts: 44
Total Cats: 0
Default

This is what I added last year.


Ref: this post: https://www.miataturbo.net/mspnp-55/...n-table-75095/
Attached Thumbnails
High AFR on basemap  MSPNP MM9093-80-skjermbilde_2016_04_18_13_55_08_a4c49728c3f07d85ca11bd5e382a17f4239ae9da.png  
helly is offline   Reply With Quote
Old 04-18-2016, 09:09 AM   #25
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,809
Total Cats: 1,780
Default

looks like you need to bump it up a bit more.

watch your Gair and Gammae. Gair is air based corrections, and gammae is total.


you want to make that curve net you 100% Gair across all temps. Then after you've perfect tuned your fuel map, you'll adjust that curve to keep the AFRs in check in extreme temps.
Braineack is offline   Reply With Quote
Old 04-18-2016, 09:17 AM   #26
Newb
Thread Starter
 
Join Date: Jun 2014
Location: Norway
Posts: 44
Total Cats: 0
Default

Thanks. So 90% gair = 10% less fuel? And 110% gair = 10% more fuel?

If so. Eureka. If I compare Gair and MAT in the logs: When the temperature goes up, gair% goes down.

Gammae and Gair seems identical in the log. Is that correct?

Thank you so much for taking the time educate a noob.
helly is offline   Reply With Quote
Old 04-18-2016, 09:45 AM   #27
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,809
Total Cats: 1,780
Default

yup.
Braineack is offline   Reply With Quote
Old 04-18-2016, 02:37 PM   #28
Newb
Thread Starter
 
Join Date: Jun 2014
Location: Norway
Posts: 44
Total Cats: 0
Default

I added 10% at 71C and 93C



I went for a long drive and these are logs from me stopping at the shop. Gone about 10 mins. The later one is from me stopping to fill gas. max 5 minutes. Same problem. GAIR is about 93 and AFR 18 -19. CLT: 79C (159.8F) MAT: 37C (98.6F) .
http://px08.net/mx5/2016-04-18_18.39.26.msl
http://px08.net/mx5/2016-04-18_18.55.25.msl
http://px08.net/mx5/CurrentTune-helly2.msq
Attached Thumbnails
High AFR on basemap  MSPNP MM9093-80-skjermbilde_2016_04_18_19_25_17_8a811b241346d19f4671f5c59c0557eb6aae0413.png  
helly is offline   Reply With Quote
Old 04-18-2016, 03:02 PM   #29
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,809
Total Cats: 1,780
Default

where is your AIT sensor located?
Braineack is offline   Reply With Quote
Old 04-18-2016, 03:10 PM   #30
Newb
Thread Starter
 
Join Date: Jun 2014
Location: Norway
Posts: 44
Total Cats: 0
Default

In a plastic tube near the intake. After the Supercharger.

Erh.. I mean, near the intake manifold. Not the "intake" as in the airfilter.
helly 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 57 07-19-2017 05:11 PM
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
01-05 Fab9 PNP COPs (used) FrankB Miata parts for sale/trade 6 09-30-2015 12:48 PM
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 AM
mm0105 TABLE SWITCHING WIRING? slomiata MEGAsquirt 2 09-15-2015 01:54 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 07:36 AM.