Changing injectors and ve table? - 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 04-22-2012, 12:47 AM   #1
Senior Member
Thread Starter
iTrader: (3)
 
Join Date: Sep 2011
Location: Plano TX
Posts: 595
Total Cats: 2
Default Changing injectors and ve table?

Hello,
I am about to change injectors. Currently have 460cc injectors and am changing to 550cc purple tops (although look more like red).
My current required fuel setting is6.2 and 6.2 ms. I know I need to change them by the percentage of injector change.
17% i believe. So do I add 6.2 x .17 = 1.054
So do I add or remove 1.054.

What about ms do I change that.
I have the ms2 diypnp.

Also in looking at my ve table at the top in boost I am in the 120-129 range is that ok.

Idle is at 32 ve.

Thanks in advance I tried to figure it out by searching.
90 Turbo is offline   Reply With Quote
Old 04-22-2012, 12:57 AM   #2
I'm Miserable!
 
Join Date: Jun 2009
Location: albany, ga
Posts: 1,869
Total Cats: 3
Default

remove, also I bet your dead time is what 1.2?
Techsalvager is offline   Reply With Quote
Old 04-22-2012, 01:40 AM   #3
Senior Member
Thread Starter
iTrader: (3)
 
Join Date: Sep 2011
Location: Plano TX
Posts: 595
Total Cats: 2
Default

so 5.2 req fuel do I change the 6.2 ms to 5.2 too.
What is dead time and should I change it.
You are right it is currently at 1.2. Should I change it.
90 Turbo is offline   Reply With Quote
Old 04-24-2012, 01:13 PM   #4
Senior Member
Thread Starter
iTrader: (3)
 
Join Date: Sep 2011
Location: Plano TX
Posts: 595
Total Cats: 2
Default

In my searches it showed the 550 needed a 7.0 to 7.6 req fule why is mine so low?

Also most ve table I see dont have any # over a hundred but mine does. Can some one please explain.

Also what is dead time?
90 Turbo is offline   Reply With Quote
Old 04-24-2012, 01:19 PM   #5
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,833
Total Cats: 1,786
Default

new req_feul should be 5.2. thats all you should change.


/thread.


math, since you messed it up: 460/550 = .84 x 6.2 = 5.2
Braineack is offline   Reply With Quote
Old 04-24-2012, 02:06 PM   #6
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 406
Default

to add to brain's "/thread" comment... here is why:

your engine's VE is not changing. therefore the VE table shouldn't need to change. just the scaling of the fuel and req_fuel addresses that.
y8s is offline   Reply With Quote
Old 04-25-2012, 12:20 PM   #7
Senior Member
Thread Starter
iTrader: (3)
 
Join Date: Sep 2011
Location: Plano TX
Posts: 595
Total Cats: 2
Default

Ok. I get that I guess my question is what are the acceptable limits/range of ve cells. I see most people dont have anything over 100 in htere map. Mine goes to 129 in boost at high rpm.
Is that anything to be concerned about.
90 Turbo is offline   Reply With Quote
Old 04-25-2012, 12:21 PM   #8
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,833
Total Cats: 1,786
Default

nope. you could techincally leave the req_fuel value the same and rescale the entire ve table by 117%


then youd be well above 129%VE
Braineack is offline   Reply With Quote
Old 04-25-2012, 12:49 PM   #9
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 406
Default

VE Table can go 0-255 I believe.

the more you use, the better your fuel resolution. Just dont run out!

VE can be above 100% with boost since you're pushing more air into the cylinder than it can suck in by itself via vacuum.
y8s 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
Changing from 460cc to flow force 610cc in diypnp 90 Turbo MEGAsquirt 19 10-19-2015 04:23 PM
Going back to stock. Need some 1.6 parts. Trent WTB 2 10-01-2015 01:15 PM
Time to start learning and play with tuning The Gleas MEGAsquirt 3 10-01-2015 10:30 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 04:48 AM.