What is your overrun set to - 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 05-24-2007, 12:51 PM   #1
:(
Thread Starter
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default What is your overrun set to

it is supposed to cut fuel etc on decel but since we dont have a TPS it would have a fair bit of trouble determining what is steady boost and what is decreasing boost etc. So should i set it to athmospheric pressure or should i set it to my max boost level any thoughts?
magnamx-5 is offline   Reply With Quote
Old 05-24-2007, 01:11 PM   #2
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

doesn't overrun cut in at your minimum MAP value?
y8s is offline   Reply With Quote
Old 05-24-2007, 01:15 PM   #3
Ben
Supporting Vendor
iTrader: (33)
 
Ben's Avatar
 
Join Date: Jul 2006
Location: atlanta-ish
Posts: 12,689
Total Cats: 99
Default

yeah you want it at a minium value, it cuts fuel when you're coasting in gear.
Ben is offline   Reply With Quote
Old 05-24-2007, 02:19 PM   #4
Elite Member
iTrader: (13)
 
cjernigan's Avatar
 
Join Date: Oct 2006
Location: Atlanta, GA
Posts: 8,147
Total Cats: 6
Default

If you're still tuning fuel Richy you should have over run, accel enrich, and EGO turned off till you have your map close to where you want it.

Did you end up messing with timing more?
cjernigan is offline   Reply With Quote
Old 05-24-2007, 02:21 PM   #5
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,883
Total Cats: 1,790
Default



set the kPa a bit below what you idle at (i usually idle at 32kPa)
Braineack is online now   Reply With Quote
Old 05-24-2007, 02:56 PM   #6
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

what brainy said.

also you can use the lowest row in your fuel table to do the same thing.
y8s is offline   Reply With Quote
Old 05-24-2007, 03:30 PM   #7
:(
Thread Starter
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

i figured as much ok i did lean out my lowest level but the damn thing is still way rich. No chad unfortunatley timming is still stock i will just wait for adam to fix his or maybe do it on a rainy day. at least the car is driveable now and does not leak fuel. thanks guys ill play with it some more.
magnamx-5 is offline   Reply With Quote
Old 05-24-2007, 06:03 PM   #8
Junior Member
 
Join Date: Nov 2005
Location: Down Under
Posts: 252
Total Cats: 0
Default

Quote:
Originally Posted by Braineack View Post


set the kPa a bit below what you idle at (i usually idle at 32kPa)
That rpm setting is probably a bit to low. I used to run my car at that setting but I found that it would cause an idle dip as the idle control only had a few hundred rpm to re-organise itself when I was stopping at lights or in heavy traffic.

I'm now running an rpm setting of 2000 rpm for the over run fuel cut and that works much better as the idle control has enough margin to remove the idle dip.
Aussie Driver is offline   Reply With Quote
Old 05-24-2007, 06:39 PM   #9
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

true on too low rpm. 2000 or even higher isn't so bad. i use low gears for stop 'n go traffic and the overrun kicking in is a pain in the bucky herky jerky ***.

but I like that "after (sec)" setting! I wish I had that. I'd set it to like 3. keep that **** from engaging while I'm coasting under 20mph. actually that'd be good too.. a mph setting.
y8s is offline   Reply With Quote
Old 05-24-2007, 07:03 PM   #10
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,883
Total Cats: 1,790
Default

I'm not even sure those are my settings...just happened to be what was on the random msq file i loaded at work....
Braineack is online now   Reply With Quote
Old 05-24-2007, 10:21 PM   #11
Supporting Vendor
iTrader: (5)
 
Join Date: Jun 2006
Location: Duluth, GA 30097
Posts: 798
Total Cats: 0
Default

Probably the best way to get the kpa setting is to watch the MAP reading when your decelerating in gear... so on the highway in forth or something let it decel and see what your MAP drops to. That's the most vacuum you'll ever see... add 3 kpa to that and use that as your overrun kpa setting. That way when your lightly cruising you won't approach that limit as you'll only get close to it in decel, when you want it....
FoundSoul is offline   Reply With Quote
Old 05-25-2007, 03:56 AM   #12
Elite Member
iTrader: (5)
 
akaryrye's Avatar
 
Join Date: Jul 2006
Location: Central California
Posts: 2,526
Total Cats: 0
Default

I messed with these settings a little bit, and though i have not spent much time driving with it enabled, I have no problems running 25-30kpa engagement. Why would I want it any lower as it saves fuel for me while I am decellerating? If I followed Jerry's advice, it would come out to around 15 - 20kpa. Seems to help engine braking when the fuel is cut.

Edit 08.06.07 ... since this time i realized jerry was right, 25 is as high as it can go without completely annoying me to death and 20 is just right.

Last edited by akaryrye; 08-06-2007 at 01:41 AM.
akaryrye is offline   Reply With Quote
Old 05-25-2007, 08:02 AM   #13
Supporting Vendor
iTrader: (5)
 
Join Date: Jun 2006
Location: Duluth, GA 30097
Posts: 798
Total Cats: 0
Default

Because without a TPS it's very easy for it to engage when you don't want it too-- like at very light throttle/almost no throttle cruise, when your vacuum will get at or near that idle range, or just below in rare cases. You'll feel the car cut out and wonder what the heck is going on.

If set it the way I described, then you've set it to activate when you're truly decelerating, and only then.
FoundSoul is offline   Reply With Quote
Old 05-25-2007, 04:40 PM   #14
:(
Thread Starter
iTrader: (7)
 
Join Date: Jul 2006
Location: nowhere
Posts: 8,281
Total Cats: 2
Default

so i will aim for 20 inches on mercury thanks guys. I thought maybe it would jsut pull fuel when you let off the forward map motion. it makes sense now.
magnamx-5 is offline   Reply With Quote
 
 
Reply

Related Topics
Thread Thread Starter Forum Replies Last Post
OTS Bilstein to motorsports ASN conversion stoves Suspension, Brakes, Drivetrain 5 04-21-2016 04:00 PM
My solution for Oiltemp and Oilpressure input into Megasuirt (MS3) Zaphod MEGAsquirt 41 01-24-2016 01:25 PM
Changing from 460cc to flow force 610cc in diypnp 90 Turbo MEGAsquirt 19 10-19-2015 04:23 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
Leaky Wilwoods mx592 Suspension, Brakes, Drivetrain 1 10-01-2015 01:45 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 12:03 PM.