Crappy post-crank idle - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


Reply
 
 
 
LinkBack Thread Tools Search this Thread
Old 08-13-2009, 11:27 AM   #1
Elite Member
Thread Starter
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default Crappy post-crank idle

My post-crank idle is crap right now. I have been trying different post-crank enrichment settings and am not there yet. Getting tired of screwing with it. What are you guys using?

Once the enrichment goes away it idles and runs just fine. Seems like I tried it with no enrichment at all and it was still not right.
ZX-Tex is offline   Reply With Quote
Old 08-13-2009, 11:35 AM   #2
Murderator
iTrader: (76)
 
18psi's Avatar
 
Join Date: Apr 2008
Posts: 36,201
Total Cats: 2,584
Default

I'm using y8's enrichment settings and added +2 to each from 30*-45* and -1 to each from 100*-105* and its decent. Not perfect still but getting there and definitely not bad. Idle afr is anywhere between 15-13.6 almost always.
18psi is offline   Reply With Quote
Old 08-13-2009, 12:07 PM   #3
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

I use about 20 for 1250 for short
and 30 for 25000 for long

is your "coolant enrichment low MAP" set properly?


generally speaking,
if it starts good and slows down and dies, it's too lean.
if it starts slow and sputtery and cleans up and idles normally, it's too rich.

add/subtract in 5% increments to get a feel for those two points. of course it's kinda hard when it's warm but... you get the idea.
Attached Thumbnails
Crappy post-crank idle-clt_low.gif  
y8s is offline   Reply With Quote
Old 08-13-2009, 12:13 PM   #4
Elite Member
Thread Starter
iTrader: (15)
 
Join Date: Dec 2007
Location: San Antonio, Texas
Posts: 4,889
Total Cats: 28
Default

Quote:
Originally Posted by y8s View Post
I use about 20 for 1250 for short
and 30 for 25000 for long

is your "coolant enrichment low MAP" set properly?


generally speaking,
if it starts good and slows down and dies, it's too lean.
if it starts slow and sputtery and cleans up and idles normally, it's too rich.

add/subtract in 5% increments to get a feel for those two points. of course it's kinda hard when it's warm but... you get the idea.
Right now it starts slow and sputtery then cleans up and idles normally. So I think it is too rich. I'll mess with it some more. I'll also check the "coolant enrichment low MAP". I think I set it up but need to double-check it.

Which injectors are you running again?

Thanks
ZX-Tex is offline   Reply With Quote
Old 08-13-2009, 12:57 PM   #5
y8s
2 Props,3 Dildos,& 1 Cat
iTrader: (8)
 
y8s's Avatar
 
Join Date: Jun 2005
Location: Fake Virginia
Posts: 19,038
Total Cats: 407
Default

550cc.

I'd drop the long post crank. sounds like that's where it's causing problems.

remember it's mostly used to provide enough fuel for combustion when the motor is too cold to maintain reasonable atmoization and intake wetting. thats why you can sometimes see lean conditions even when you're dumping in fuel at startup.
y8s is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
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
Low oil pressure after 1.8 swap and new turbo setup JesseTheNoob DIY Turbo Discussion 15 09-30-2015 03:44 PM
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 AM
mslabs MS2 - Idle control issue ndragun MEGAsquirt 0 09-20-2015 11:28 PM


Thread Tools Search this Thread
Search this Thread:

Advanced Search

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 05:58 PM.