And the NA idle valve frequency is... - 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 06-03-2010, 03:54 PM   #1
Supporting Vendor
Thread Starter
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,441
Total Cats: 198
Default And the NA idle valve frequency is...

170Hz.

Measured today on a friend's 97. Time to put the uncertainty aside.

Dimitris
Reverant is offline   Reply With Quote
Old 06-03-2010, 04:00 PM   #2
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

Probably explains why my 1.6L valve is running so well with 195Hz on MS-III.


fwiw, the MSPNP 90-93 msq has always used 161Hz, the 94-97 msqs always used 384Hz.
Braineack is offline   Reply With Quote
Old 06-03-2010, 04:02 PM   #3
Supporting Vendor
Thread Starter
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,441
Total Cats: 198
Default

I haven't played with my MS3 card yet, does it have hardware PWM for the idle valve?
Reverant is offline   Reply With Quote
Old 06-03-2010, 04:03 PM   #4
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

yes PID closed loop with a/c idle up feature. and an Idle VE table to boot.
Braineack is offline   Reply With Quote
Old 06-03-2010, 04:06 PM   #5
Supporting Vendor
Thread Starter
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,441
Total Cats: 198
Default

Q: did you notice that the idle up feature doesn't work well all the time? It may be fine when the car has just warmed up but not so well when the engine bay has heatsoaked (hint: I'm using an idle-up circuit on the MS2).
Reverant is offline   Reply With Quote
Old 06-03-2010, 04:12 PM   #6
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

A: It works wonderful.

Braineack is offline   Reply With Quote
Old 06-03-2010, 04:14 PM   #7
Supporting Vendor
Thread Starter
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,441
Total Cats: 198
Default

I'm not talking about 10 minutes after, more like 45 minutes or more.
Reverant is offline   Reply With Quote
Old 06-03-2010, 04:24 PM   #8
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

never had an issue so far, dunno. drove it on the highway the other day a good hour-and-a-half round trip.
Braineack is offline   Reply With Quote
Old 06-03-2010, 04:26 PM   #9
Supporting Vendor
Thread Starter
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,441
Total Cats: 198
Default

You don't happen to have a datalog of that trip?
Reverant is offline   Reply With Quote
Old 06-03-2010, 04:28 PM   #10
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,792
Default

nope. i can datalog saturday for a 25 mile drive. Once I finally got my idle control settings down, I haven't had to touch them. I just idle it a little high else it sometimes stalls on quick decelerations, i blame other settings like the lock-out numbers and the triggers. idle is always smooth at 1000rpm so i leave it there.
Braineack is offline   Reply With Quote
Old 06-03-2010, 04:30 PM   #11
Supporting Vendor
Thread Starter
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,441
Total Cats: 198
Default

Please, don't feel obligated just because I asked.
Reverant is offline   Reply With Quote
Old 06-03-2010, 06:06 PM   #12
Elite Member
iTrader: (1)
 
Join Date: Jun 2006
Location: Warrington/Birmingham
Posts: 2,658
Total Cats: 39
Default

weird I always thought the 1.8 Idle valve was around 400hz.

Al well I'll move it down and see if I gain some granularity
richyvrlimited is offline   Reply With Quote
Old 06-04-2010, 12:31 AM   #13
Junior Member
 
Join Date: Jan 2008
Location: Toronto, Ontario, Canada
Posts: 74
Total Cats: -4
Default

is the same valve on the 94 as on the 97?

I have the 9093pnp but a 1.8 swap (a 94). I only recently realized the idle valve is from the 1.8 so my settings need to be changed.
Probably explains my idle troubles. doh!
StarGehzer is offline   Reply With Quote
Old 06-04-2010, 04:08 AM   #14
Supporting Vendor
Thread Starter
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,441
Total Cats: 198
Default

Quote:
Originally Posted by richyvrlimited View Post
weird I always thought the 1.8 Idle valve was around 400hz.

Al well I'll move it down and see if I gain some granularity
The 99+ 1.8 idle valve is 500Hz:




Dimitris
Reverant is offline   Reply With Quote
Old 06-04-2010, 04:37 AM   #15
Elite Member
iTrader: (1)
 
Join Date: Jun 2006
Location: Warrington/Birmingham
Posts: 2,658
Total Cats: 39
Default

Quote:
Originally Posted by Reverant View Post
The 99+ 1.8 idle valve is 500Hz:




Dimitris
But I'm using a 96 idle valve
richyvrlimited is offline   Reply With Quote
Old 06-04-2010, 04:43 AM   #16
Supporting Vendor
Thread Starter
iTrader: (10)
 
Reverant's Avatar
 
Join Date: Jun 2006
Location: Athens, Greece
Posts: 5,441
Total Cats: 198
Default

Ah, ok, I thought you were using the 2001 idle valve.

Dimitris
Reverant is offline   Reply With Quote
Old 06-05-2010, 10:13 AM   #17
Elite Member
iTrader: (1)
 
Join Date: Jun 2006
Location: Warrington/Birmingham
Posts: 2,658
Total Cats: 39
Default

Quote:
Originally Posted by Reverant View Post
Ah, ok, I thought you were using the 2001 idle valve.

Dimitris
Was going to and I can understand you thinking I was, but it made the swop a tinsy bit simpler, (wiring/plugs for the ICV and TPS), to just bolt the NA TB on in place of the NB one.
richyvrlimited is offline   Reply With Quote
Old 06-20-2010, 12:08 PM   #18
Elite Member
iTrader: (1)
 
Join Date: Jun 2006
Location: Warrington/Birmingham
Posts: 2,658
Total Cats: 39
Default

Changed to a multiplier of 6 - from 13 - and when the engine wants to idle at a DC that was in-between it's two previous points it's now far happier.

I'm still not convinced 100% that 170Hz is the right frequency though, occasionally I hear a low drone from the valve, the sort of noise you get from valves when they're not at the correct frequency, except very quiet and subtle.

See how I get on over the next week or so.
richyvrlimited 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 59 12-15-2017 09:00 PM
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
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


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 03:27 AM.