Life without ISC. What's it like? - Page 3 - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


General Miata Chat A place to talk about anything Miata

Reply
 
 
 
LinkBack Thread Tools
Old 12-02-2010, 12:59 PM   #41
Supporting Vendor
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,440
Total Cats: 198
Default

You're doing it wrong.
Reverant is offline   Reply With Quote
Old 12-02-2010, 01:00 PM   #42
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,827
Total Cats: 1,785
Default

What he said

How long is your crank to run timer? Is your cranking idle PWM table too high?
Braineack is offline   Reply With Quote
Old 12-02-2010, 01:13 PM   #43
Elite Member
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default

Quote:
Originally Posted by Braineack View Post
What he said

How long is your crank to run timer? Is your cranking idle PWM table too high?
Here are my settings

Should I have selected IAC closed loop instead of PWM closed loop?

miatauser884 is offline   Reply With Quote
Old 12-02-2010, 01:59 PM   #44
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,827
Total Cats: 1,785
Default

Post the CL idle valve settings and CL idle PID settings.

The coolant based cranking table is what PWM% your idle with will be positioned while you crank and where it will sit before the PID closed loop kicks in. If your idle is shooting up too high after intial start, you should lower those values. Also double check your RPM targets aren't too high.
Braineack is offline   Reply With Quote
Old 12-02-2010, 02:05 PM   #45
Elite Member
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default



I just changed my "crank to run taper" from 5s to 2s. I have not tested this yet.
miatauser884 is offline   Reply With Quote
Old 12-02-2010, 02:17 PM   #46
Supporting Vendor
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,440
Total Cats: 198
Default

Increase crank to run taper to 4 or 5s.
Same for PID ramp to target time
Increase PID lockout rpmDOT - try 100.
Increase PID disable RPMdot to at least 500
Your dashpot adder is high, try 1% or none at all.
Reverant is offline   Reply With Quote
Old 12-02-2010, 02:19 PM   #47
Senior Member
iTrader: (1)
 
Join Date: Apr 2010
Location: Portales, NM
Posts: 837
Total Cats: 2
Default

Quote:
Originally Posted by Braineack View Post
When I left my Internet Scrabble Club I regretted it. I felt alone and impudent. They refused to let me rejoin.
jbrown7815 is offline   Reply With Quote
Old 12-02-2010, 02:23 PM   #48
Elite Member
Thread Starter
iTrader: (2)
 
Join Date: Jan 2007
Location: Los Angeles, CA
Posts: 8,782
Total Cats: 119
Default

Quote:
Originally Posted by Braineack View Post
why?! have a thing for sweaty *****?
Damn you megasquirt freaks GTFO with your jibjab and all

I want a low mount ramhorn vband artech manifold.
Faeflora is offline   Reply With Quote
Old 12-02-2010, 02:27 PM   #49
Elite Member
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default

Quote:
Originally Posted by Reverant View Post
Increase crank to run taper to 4 or 5s.
Same for PID ramp to target time
Increase PID lockout rpmDOT - try 100.
Increase PID disable RPMdot to at least 500
Your dashpot adder is high, try 1% or none at all.
OK, I made those changes, and will test at lunch. I'll reduce the coolant crank duty% if this doesn't work. My target RPM when cold is 1100rpm.
miatauser884 is offline   Reply With Quote
Old 12-02-2010, 02:41 PM   #50
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,827
Total Cats: 1,785
Default

yeah if you look at your settings the max the MS ever try to allow your valve to go is 40% when in PID mode, so you initial cranking duty table looks like it would cause high RPMs.

The rest dimitris suggested to change probably have little effect, just the delay before the PID code kicks in. I use 3% dashpot adder, I like the idle to drop 100-200RPM above my target and settle in.

For RPMdot lockout, just turn the RPMdot gauge on, watch it at idle and change the value to be 10 points above it. I see 80 on my gauge, so I use 90.
Braineack is offline   Reply With Quote
Old 12-02-2010, 04:03 PM   #51
Elite Member
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default

So far so good on my drive at lunch. I started the car and immediately started driving. The idle settled fine. I'll have a better idea tomorrow when it is colder, but the car had been off for 5 hours so it normally would have hung the idle open.

I used to have the idle valve set to 98% After datalogging I saw that my IAC never opened past 41% or closed below 21%, so these are the values that i set for max and min. I guess increasing the max to 100 won't hurt anything.
miatauser884 is offline   Reply With Quote
Old 12-02-2010, 04:15 PM   #52
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,827
Total Cats: 1,785
Default

well. go to idle valve test mode and find the range in which it acutally works. You don't have to plug in the actual numbers, reducing the window like that will increase your resolution/sensitivity. When it's cold or going uphill in first gear you might find you need more than 40%. I think I have mine set to 60% but it doesn't go open any further after that point so that's the full open point.
Braineack is offline   Reply With Quote
Old 12-02-2010, 05:18 PM   #53
Elite Member
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default

Quote:
Originally Posted by Braineack View Post
well. go to idle valve test mode and find the range in which it acutally works. You don't have to plug in the actual numbers, reducing the window like that will increase your resolution/sensitivity. When it's cold or going uphill in first gear you might find you need more than 40%. I think I have mine set to 60% but it doesn't go open any further after that point so that's the full open point.
Ok I set the step size to 100 int he idle valve test window. I'll check it out before I leave work tonight. I've never used this before. Will it run through the check with the ignition on since the IAC valve is on, or does the car need to be running?
miatauser884 is offline   Reply With Quote
Old 12-02-2010, 05:21 PM   #54
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,827
Total Cats: 1,785
Default

yes, run the car. go to idle valve test mode, and plug in the number you want to sit the valve at. if you put in 0, the valve will be fully closed. Increase it until your idle speed acutally rises. Then you know this is the lowest dc% number that acutally works the valve. Keep going up until you find the highest value that increases the engine speed. Then you know what the max dc% is.

You'll have to restart the car in order to go back to normal idle.
Braineack is offline   Reply With Quote
Old 12-02-2010, 05:52 PM   #55
Elite Member
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default

What base settings do I select "home" or "run"? Do I set both to zero initially?

miatauser884 is offline   Reply With Quote
Old 12-02-2010, 06:23 PM   #56
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,827
Total Cats: 1,785
Default

once you turn it on, change Move to home or vise versa. then you change the iac step value 0-100%.
Braineack is offline   Reply With Quote
Old 12-02-2010, 06:29 PM   #57
Elite Member
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default

Quote:
Originally Posted by Braineack View Post
once you turn it on, change Move to home or vise versa. then you change the iac step value 0-100%.
What do you set "iac home steps" to? 0 or leave it at default 160?
miatauser884 is offline   Reply With Quote
Old 12-02-2010, 07:32 PM   #58
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,827
Total Cats: 1,785
Default

that doesnt pertain.
Braineack is offline   Reply With Quote
Old 12-02-2010, 10:49 PM   #59
Elite Member
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default

your t, once plugged in it became obvious. I started at zero. My idle was higher than normal. As I increased from zero the idle dropped to normal. Then when i got to 17 it started to increase. It increased all the way to 98, but stopped dramatically increasing after 82. I set my min value as 17 and my max value as 82.
miatauser884 is offline   Reply With Quote
Old 12-03-2010, 12:07 AM   #60
mkturbo.com
iTrader: (24)
 
shuiend's Avatar
 
Join Date: May 2006
Location: Charleston SC
Posts: 13,775
Total Cats: 1,106
Default

That is where my IAC is remotely located. It is on the drivers side right next to the headlight. The lines are a bitch to run to it.
shuiend is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
1994 Spec Miata Race Car SM/SM2/SSM For Sale Quinn Cars for sale/trade 6 10-23-2016 08:58 AM
Transmission Heat Shield Thread patsmx5 General Miata Chat 46 06-06-2016 11:27 AM
elesjuan's mediocre 95 Miata adventure (google fiber edition) elesjuan Build Threads 8 02-16-2016 09:36 PM
Please school me on life insurance... samnavy Insert BS here 14 10-11-2015 12:21 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 05:25 PM.