What is this stumble? - 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 04-20-2012, 04:59 PM   #21
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,854
Total Cats: 1,788
Default

put decel to 98% and fix the noise.
Braineack is offline   Reply With Quote
Old 04-20-2012, 06:06 PM   #22
Elite Member
iTrader: (11)
 
Join Date: Feb 2009
Posts: 2,982
Total Cats: 10
Default

I'm running 90 for my lag factors. Y8s, Are you using the regular AE or the accel pump style? If accel pump, any tips for switching over from regular? I haven't tried it yet.

The initial value table for the PWM is awesome. My idle is the best it's ever been and I have no issues with rpm dropping and the PID not catching properly.
miatauser884 is offline   Reply With Quote
Old 04-20-2012, 06:33 PM   #23
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

the new one. tips? sure.

set min tpsdot threshold to 1 in the box at the bottom.

then use the curve to set your minimum enrichment level. for now I'm at 15tpsdot = 0% and then like 30 tpsdot = 10 and the curve tops out at like 800 tpsdot = 70% or something.
y8s is offline   Reply With Quote
Old 04-24-2012, 06:30 PM   #24
Hear me Meow
Thread Starter
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,994
Total Cats: 13
Default

Well, I haven't had time to flash to the newest firmware, but I tried to fix the noisy MAP signal when I had a few minutes this afternoon. I played with the physical MAP line, and with the lag factor, and so far haven't figured it out, but now VVT has stopped working for no apparent reason. It sits at 274.9 degrees and the duty cycle won't change. I didn't touch the VVT settings...

I have Friday off, so I am planning to upgrade to beta20 then.
skidude is offline   Reply With Quote
Old 04-25-2012, 01:27 PM   #25
Hear me Meow
Thread Starter
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,994
Total Cats: 13
Default

Could replacing the timing belt have caused enough change in the "rest" position of the cam to mess with my VVT settings? I am guessing the old belt was the original belt at 80k miles.

Also, the weird stumble is nearly non-existant when the VVT is "stuck". Coincidence?
skidude is offline   Reply With Quote
Old 04-25-2012, 01:34 PM   #26
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,854
Total Cats: 1,788
Default

Quote:
Originally Posted by djp0623 View Post
I'm running 90 for my lag factors. Y8s, Are you using the regular AE or the accel pump style? If accel pump, any tips for switching over from regular? I haven't tried it yet.
the pump is awesome. im on prebeta21 where he fixed a small issue with it, it's baller. best throttle response to date.
Braineack is offline   Reply With Quote
Old 04-25-2012, 01:36 PM   #27
Hear me Meow
Thread Starter
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,994
Total Cats: 13
Default

I am excited to try this Beta, I may even skip dinner and try it tonight. Better VVT stuff, better accel stuff, sounds like everything I want from an ECU.
skidude is offline   Reply With Quote
Old 04-25-2012, 02:44 PM   #28
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

Quote:
Originally Posted by skidude View Post
Could replacing the timing belt have caused enough change in the "rest" position of the cam to mess with my VVT settings? I am guessing the old belt was the original belt at 80k miles.

Also, the weird stumble is nearly non-existant when the VVT is "stuck". Coincidence?
if you accidentally advanced the intake cam so you have overlap, then yes it could jack your idle.
y8s is offline   Reply With Quote
Old 04-25-2012, 03:03 PM   #29
Hear me Meow
Thread Starter
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,994
Total Cats: 13
Default

Not idle, just that when the VVT position registers as like 274.9, it doesn't move. Could a fresh timing belt have rotated the cam just enough so what used to be 0* of advance now reads as 274.9?
skidude is offline   Reply With Quote
Old 04-25-2012, 09:31 PM   #30
Hear me Meow
Thread Starter
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,994
Total Cats: 13
Default

Beta20 seems to have fixed my problems. It was a lot easier to upgrade than I expected. I thought I would have to re-tune a bunch of stuff, but it runs fine. I'll tweak the idle (it needed work anyway), and switch to the pump accel thing as soon as I can find some info on how it works. I did change my lag factors so they are all between 85 and 93. I picked some random numbers based on the previous values.

The VVT works (or at least it seems to), so I'm guessing the code for that changed... do I need to change my PID values, is there room for improvement there?

The cold idle required more air than it did before, but that was easy to fix, and may have been just because the car was colder than usual.
skidude is offline   Reply With Quote
Old 04-25-2012, 09:35 PM   #31
Hear me Meow
Thread Starter
iTrader: (3)
 
skidude's Avatar
 
Join Date: Apr 2008
Location: Outside Portland Maine
Posts: 1,994
Total Cats: 13
Default

Oh, here's a datalog and current msq. Does my map signal look better? How about rpmdot?
Attached Files
File Type: msq 2012-04-25_20.09.14.msq (159.0 KB, 46 views)
File Type: msl 2012-04-25_20.01.24.msl (581.3 KB, 43 views)
skidude is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
6ULs for Sale in Green Bay JStoops Miata parts for sale/trade 0 09-28-2015 06:35 PM
hesitation/stumble *pics gompers General Miata Chat 25 10-06-2009 08:08 PM
The Mite Qckslvr Insert BS here 7 03-05-2009 04:35 PM
help strange problems with link! spoolin2bars ECUs and Tuning 2 01-23-2009 11:37 AM
stumble/misfire? gompers General Miata Chat 6 01-15-2009 06:03 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 03:01 PM.