home register FAQ memberlist calendar

Go Back   Turbobricks Forums > Mechanical > performance & modifications > aftermarket engine management

Reply
 
Thread Tools Display Modes
Old 08-26-2020, 03:36 PM   #1
fastcomet
Board Member
 
Join Date: Oct 2016
Default megasquirt idle

Putting a new intake on today with big throttle body. To clean up hoses etc. Can megasquirt take care of idle by cracking the throttle blade instead of running Idle Control Motor. Which I replaced long ago with a check valve. Car is a 93 volvo 240 with plug and play MS. Thanks
fastcomet is offline   Reply With Quote
Old 08-26-2020, 04:08 PM   #2
JohnMc
PV Abuser
 
JohnMc's Avatar
 
Join Date: May 2004
Location: St. Louis
Default

Megasquirt can't control the throttle blade, if that's what you're asking.

You could set the idle by adjusting the throttle slightly open, but that will be fixed, not controlled.
__________________
'63 PV Rat Rod
'93 245 16VT Classic #1141
JohnMc is online now   Reply With Quote
Old 08-26-2020, 04:18 PM   #3
Marvelous3
Who engineered this?
 
Marvelous3's Avatar
 
Join Date: Nov 2002
Location: Atlanta
Default

Not unless your throttle body is electric.
__________________

1990 240dl Kaplhenke Coilover Daily
1991 245+16 Valve Turbo Microsquirt
Need Hyundai or Genesis parts? PM me for Genuine Hyundai or Genesis parts
Marvelous3 is offline   Reply With Quote
Old 08-26-2020, 05:36 PM   #4
fastcomet
Board Member
 
Join Date: Oct 2016
Default

Sorry if my question wasn’t real clear. I guess what I’m asking is can I plug the idle control hose fitting in the intake and remove all the extra idle c. Motor. And just crack the throttle blades manually to control the idle speed? I would think I could but I’m not positive.. thanks guys
fastcomet is offline   Reply With Quote
Old 08-26-2020, 05:50 PM   #5
JohnMc
PV Abuser
 
JohnMc's Avatar
 
Join Date: May 2004
Location: St. Louis
Default

Quote:
Originally Posted by JohnMc View Post
Megasquirt can't control the throttle blade, if that's what you're asking.

You could set the idle by adjusting the throttle slightly open, but that will be fixed, not controlled.
This may or may not be annoying. Do you have working A/C? Other than that, you'd probably need to keep your foot on it when it's cold.

Last edited by JohnMc; 08-26-2020 at 06:23 PM..
JohnMc is online now   Reply With Quote
Old 08-26-2020, 05:51 PM   #6
Harlard
Hurlurd?Harland?Bueller?
 
Harlard's Avatar
 
Join Date: May 2007
Location: PDX
Default

You can have it manage idle speed with an ignition timing adjustment curve once you set your desired speed by cracking the throttle blade. You will have to feather the throttle with your foot on cold starts.

Also, reread the Tunerstudio reference guide cover to cover. This is covered in detail in the product documentation.
__________________


Herr Harlard am Erstens

1979 242 DL

Quote:
Originally Posted by t8fanning View Post
My knob has a big chunk of steel on it
Harlard is online now   Reply With Quote
Old 08-26-2020, 06:20 PM   #7
cwdodson88
Board Member
 
Join Date: Oct 2011
Location: The Dalles, Oregon
Default

Quote:
Originally Posted by Harlard View Post
You can have it manage idle speed with an ignition timing adjustment curve once you set your desired speed by cracking the throttle blade. You will have to feather the throttle with your foot on cold starts.

Also, reread the Tunerstudio reference guide cover to cover. This is covered in detail in the product documentation.
What ^ said.

I'm working up a design for a choke bellcrank/cam thing. I had a couple ideas, one was to tickle the throttle pedal, the other was the throttle body. you just need that tiny bit on those cold mornings.
__________________
Quote:
Originally Posted by mikep View Post
Build it, break it, build what broke stronger, lather, rinse, repeat.

The Build Thread
SVEA - PUSHROD TURBO!
cwdodson88 is offline   Reply With Quote
Old 08-26-2020, 06:42 PM   #8
90volvo
Board Member
 
Join Date: May 2017
Location: Eldorado Springs Mo.
Default

Timing deal would make it simple.
__________________
90 Volvo 240 19T-3 inch ex-Aw71-Npr-V cam-E85-Megasquirt-650cc inj.-280000 miles.

sons car- 93 240-15g turbo-chipped-95,000 miles. Slick car

Leave feedback- http://forums.turbobricks.com/showthread.php?t=355413

Last edited by 90volvo; 08-26-2020 at 08:42 PM.. Reason: Update
90volvo is offline   Reply With Quote
Old 08-26-2020, 11:31 PM   #9
fastcomet
Board Member
 
Join Date: Oct 2016
Default

I dont mind keeping my foot on throttle as its warming up. Im switching intakes out tonight and just thought Id clean up engine comp. a bit and get rid of things that I dont need. Intake has volvo 960 tb, i worked on the intake injector bossws some, to help with air flow. Dont know if its gonna help any but sure cant hurt anyting. Also replacing a V cam with RSI stage 2. I hope I can get into the 13s. Only time will tell. Thanks for the help.

Last edited by fastcomet; 08-27-2020 at 11:59 AM.. Reason: correction
fastcomet is offline   Reply With Quote
Old 08-27-2020, 03:35 AM   #10
John242Ti
LH-Jet & Carb Free Zone
 
John242Ti's Avatar
 
Join Date: May 2003
Location: Duvall, WA
Default

That would probably get annoying, especially with a hotter cam that is going to have a more lopey idle than a stockish cam. In fact, I know it's annoying, since my 242 is currently requiring that I hold the throttle open, due to a non-functional constant idle system. Also, Volvo does have a warning saying not to "race" a turbo engine when cold, even though the constant idle air valve does that initial blast to 2000 rpm before it settles down to idle.

Personally, what I'd do, if you don't want a constant idle air valve, would be to run an auxiliary air valve from a non-constant idle B21F. Has a bimetal spring in it that causes the disc inside of it to open and close, depending on temperature. Requires 12 volts power and ground. Set idle to whatever makes the car run smooth enough when warm, then, when the engine's cold, crack open the throttle a little before starting, then release as soon as it fires. Engine will run around 1500ish rpm until the valve gets warm enough to close itself.
__________________

1982 242Ti - black, M46. 1985 245Ti - blue, M46.

@john242ti on IG
John242Ti is offline   Reply With Quote
Old 09-04-2020, 02:11 PM   #11
142 guy
Board Member
 
Join Date: May 2014
Location: Saskatchewan, Canada
Default

The idle / ignition advance control in MSExtra is meant to help stabilize idle speed for small idle speed variations. Not really an idle speed control mechanism. The idle advance is normally only activated when the TPS shows closed, the RPM is less than around 1000 RPM and the engine is up to operating temperature. You can fiddle those settings; but, you are trying to get the idle advance system to do something it was never intended to do. The advance curve that you program in would normally raise advance when idle speed drops below your target idle speed and reduce advance when the idle speed rises above your target idle speed.

You could set the idle advance to control around your normal target idle speed (800 - 900 RPM?). You would normally have it deactivated during warm up or doing a hot start so it will have no benefit during those operating conditions. The idle advance system is not designed to make big changes in idle speed control, that is what the idle air valve is for. If you try to bodge it by opening up the parameters and allowing huge amounts of advance or retard from base setting you are likely going to create transition issues going from idle to driving or find that the system is fighting you during the warm up period.
142 guy is offline   Reply With Quote
Reply

Thread Tools
Display Modes

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 On

Forum Jump


All times are GMT -4. The time now is 06:54 PM.

Powered by vBulletin® Version 3.8.11
Copyright ©2000 - 2020, vBulletin Solutions Inc.