Megasquirt Madness - 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 04-05-2011, 12:10 PM   #1
Newb
Thread Starter
 
Join Date: Mar 2010
Posts: 11
Total Cats: 0
Default Megasquirt Madness

I know this I a turbo forum but I'm guessing some of you have phased your projects similarly to me so maybe someone here can help: ECU first, turbo later.

My question: Does anyone have an air:fuel ratio map for an naturally aspirated 1.6L NA? I have a naturally aspirated '91, which will someday get a turbocharger added to it. In the meantime I've installed a Megasquirt PNP ECU.

While his car is turbocharged, Joe Perez gave me an air:fuel ratio map for a naturally aspirated car he that had lying around, presumably this was from his car before the turbo was added. Anyway, while the map seems pretty safe, he admits that it may not be ideal.

I'm using Tuner Studio and VE analyze to tune the volumetric efficiency and was wondering if anyone had a AFR map for a naturally aspirated 1.6L car that they could share?

Why do I ask? Well, the car is just running a little funny and frankly, I don't know what I'm doing. So I'm starting with the one thing I have half an inkling about. I don't actually know that a different AFR table will help. Maybe I'm doing the autotune wrong an the VE table is bad but I can see what I could be fouling up there. Maybe the spark table is off.

So I guess the even bigger question is whether anyone has a primer for tuning a naturally aspirated miata - a step by step set of instructions of what to do and what to look for. Thoughts? I'm here witha stack of bookstand clearly over my head.

Thanks,
__________________
Ben

'91 SE #3147/4000 (BRG)

*
1x4x9 is offline   Reply With Quote
Old 04-05-2011, 12:15 PM   #2
Cpt. Slow
iTrader: (25)
 
curly's Avatar
 
Join Date: Oct 2005
Location: Oregon City, OR
Posts: 12,107
Total Cats: 518
Default

Have you tried diyautotune's base map? Download and burn that for your '91. I don't know if it comes with a AFR target table, but it's worth a shot. Use that spark map, and don't change it what so ever. Tune only fuel for now until you know what you're doing.

When my wastegate disconnected (bandaids) the stock ecu ran a dead steady 14.7afr. I'm not saying that's ideal, but you don't need to go too rich with an N/A engine. What's Joe's target table say for atmospheric pressure?
curly is offline   Reply With Quote
Old 04-05-2011, 12:36 PM   #3
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,872
Total Cats: 1,790
Default

something like this will probably work:



blended with this:




I'd take the bottom map, and blend in the top map above at the 4600 mark and above. You can keep it lean in lower load cells in higher RPMs where you cruise, but when you get on the throttle, so between 70-100 and above 4500RPM you want it to look like the top map where it gets richer by redline.
Braineack is offline   Reply With Quote
Old 04-09-2011, 01:57 PM   #4
Newb
Thread Starter
 
Join Date: Mar 2010
Posts: 11
Total Cats: 0
Default

Thanks you guys. I'll have a look, do a little experimenting, and let you know what I learn.

Ben
1x4x9 is offline   Reply With Quote
Old 04-09-2011, 02:05 PM   #5
Newb
Thread Starter
 
Join Date: Mar 2010
Posts: 11
Total Cats: 0
Default Joe's AFR Table

Here's the AFR Table Joe gave me and the one I've been running. Any first impressions?

Thanks,

Ben
Attached Thumbnails
Megasquirt Madness-joe-perez-afr-table.gif  
1x4x9 is offline   Reply With Quote
Old 04-09-2011, 02:42 PM   #6
Newb
Thread Starter
 
Join Date: Mar 2010
Posts: 11
Total Cats: 0
Default

BTW Braineak, your AFR tables have more cells than mine - less interpolation I guess. Is there a way for me to add cells in Tuner Studio?

Thanks,

Ben
1x4x9 is offline   Reply With Quote
Old 04-09-2011, 02:44 PM   #7
Newb
Thread Starter
 
Join Date: Mar 2010
Posts: 11
Total Cats: 0
Default

I'm also curious about why the load numbers in your base case are all "normal" integers, while your custom table has some of them tweaked. Just trying to understand what people are looking at and why.

Thanks,

Ben
1x4x9 is offline   Reply With Quote
Old 04-09-2011, 03:33 PM   #8
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,872
Total Cats: 1,790
Default

Im running ms3.
Braineack is offline   Reply With Quote
Old 04-10-2011, 12:50 PM   #9
Junior Member
 
Join Date: Mar 2010
Location: Durham, NC
Posts: 409
Total Cats: 19
Default

High 13/low 14:1 AFRs melted pistons on my N/A 2001 motor on track.
FatKao is offline   Reply With Quote
Old 04-10-2011, 02:03 PM   #10
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,872
Total Cats: 1,790
Default

at WOT above 80 kPa... which is where i said to make it richer.

I'd try something like this:

Attached Thumbnails
Megasquirt Madness-afr_na.jpg  

Last edited by Braineack; 04-10-2011 at 02:13 PM.
Braineack is offline   Reply With Quote
Old 04-10-2011, 03:37 PM   #11
Elite Member
iTrader: (5)
 
Join Date: Oct 2007
Location: Canton, Ga
Posts: 1,707
Total Cats: 19
Default

why wouldnt 14's in the 100kpa range melt engines? Surely you dont want the OP to tune for that...
Stealth97 is offline   Reply With Quote
Old 05-02-2011, 07:38 PM   #12
Newb
 
Join Date: Aug 2010
Posts: 37
Total Cats: 0
Default

Braineack,

I like your AFR table. Interestingly, one of my cars I have ms3x setup. The base table is similar to yours.
Attached Thumbnails
Megasquirt Madness-base-afr-table.jpg  
heychris is offline   Reply With Quote
Old 05-02-2011, 07:43 PM   #13
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,872
Total Cats: 1,790
Default

(zack morris's phone)

Goes lean fast.. might struggle for power is high vacuum areas
Braineack is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
Any pnp megasquirt for 2001 Big_gumby WTB 0 09-30-2015 04:34 PM
1996 Turbo Build Goldwar DIY Turbo Discussion 2 09-29-2015 10:20 AM
First gen (white) megasquirt pnp 90-93 Miata firmware reflash Johnny Tater MSPNP 1 09-27-2015 01:38 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 11:01 PM.