MS3-Idle Issue/VE Fuel Percentage WTF? - Miata Turbo Forum - Boost cars, acquire cats.

Welcome to Miataturbo.net   Members
 


MSPNP MSPNP specific Megasquirt related discussion.

Reply
 
 
 
LinkBack Thread Tools
Old 04-20-2014, 01:29 AM   #1
Junior Member
Thread Starter
 
Join Date: Mar 2014
Location: Bartlett, Tn
Posts: 107
Total Cats: 2
Exclamation MS3-Idle Issue/VE Fuel Percentage WTF?

Okay... Got Rev built MS3 basic installed. Got it running, but my Fuel VE table is like nothing i have seen. I installed WRX 420cc injectors,set new injector size to 420 and required fuel which is now 7.2....... and my ve table looks like this : MS3-Idle Issue/VE Fuel Percentage WTF?-20140419_231322.jpg

Where i have the arrow hovered over is where it idles at. Why are my fuel percentages so high? i have played with the injector dead time after doing some reading on the WRX forums. Subaru supposedly states dead times of .728, and denso states claims of over 1.0ms. Leaving the dead time at .900 has yielded better VE numbers but not by much. Im used to seeing this in the 30% and 40% at the given kpa at idle. Am i just loosing my mind and being paranoid or is this okay? Also, it has an idle issue, it will run and idle fine, but if you rev the engine driving or not, it has a habit of trying to die and or dying frequently while trying to come back to idle. tried a few things but nothing has helped.

Last edited by jmuse8482; 04-20-2014 at 02:22 AM.
jmuse8482 is offline   Reply With Quote
Old 04-20-2014, 01:33 AM   #2
Junior Member
Thread Starter
 
Join Date: Mar 2014
Location: Bartlett, Tn
Posts: 107
Total Cats: 2
Default

MS3-Idle Issue/VE Fuel Percentage WTF?-20140419_233002.jpg first one came out blurry
jmuse8482 is offline   Reply With Quote
Old 04-20-2014, 09:41 AM   #3
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,896
Total Cats: 1,792
Default

were you lean at idle and now richer?

what's the AFR table look like?
Braineack is offline   Reply With Quote
Old 04-20-2014, 09:44 AM   #4
Junior Member
Thread Starter
 
Join Date: Mar 2014
Location: Bartlett, Tn
Posts: 107
Total Cats: 2
Default

Talked to Gordon at witch hunter, and he told me that dead time for the 11-ohm Light Blue WRX (195509-3920) is around 1.0ms-1.1ms. So I set the dead time to 1.1 in MS3 and everything has drastically improved along with my idle.
jmuse8482 is offline   Reply With Quote
Old 04-20-2014, 09:46 AM   #5
Junior Member
Thread Starter
 
Join Date: Mar 2014
Location: Bartlett, Tn
Posts: 107
Total Cats: 2
Default

Well my afr tables were fine... I could get 14.7 afrs... it was just the crazy ve numbers that were throwing me...
jmuse8482 is offline   Reply With Quote
Old 04-20-2014, 10:12 AM   #6
Junior Member
Thread Starter
 
Join Date: Mar 2014
Location: Bartlett, Tn
Posts: 107
Total Cats: 2
Default

This is what my VE Table looks like now, after making the said adjustments and some autotune time:
MS3-Idle Issue/VE Fuel Percentage WTF?-20140420_080137.jpg
Here is my afr table:
MS3-Idle Issue/VE Fuel Percentage WTF?-20140420_080305.jpg
jmuse8482 is offline   Reply With Quote
Old 04-20-2014, 01:58 PM   #7
Junior Member
Thread Starter
 
Join Date: Mar 2014
Location: Bartlett, Tn
Posts: 107
Total Cats: 2
Default

Anyone know why it backfires at times on decel?
jmuse8482 is offline   Reply With Quote
Old 04-20-2014, 06:19 PM   #8
I haz no trubo
iTrader: (2)
 
Oscar's Avatar
 
Join Date: Jan 2007
Location: Bolton, UK
Posts: 3,021
Total Cats: 114
Default

Because your overrun fuel cut isn't active? Wild guess since there's no .msq to look at.
Oscar is offline   Reply With Quote
Old 04-20-2014, 07:52 PM   #9
Junior Member
Thread Starter
 
Join Date: Mar 2014
Location: Bartlett, Tn
Posts: 107
Total Cats: 2
Default

Quote:
Originally Posted by Oscar View Post
Because your overrun fuel cut isn't active? Wild guess since there's no .msq to look at.
Over run is on.... Ill post an Msq soon.
jmuse8482 is offline   Reply With Quote
Old 04-20-2014, 11:11 PM   #10
Junior Member
Thread Starter
 
Join Date: Mar 2014
Location: Bartlett, Tn
Posts: 107
Total Cats: 2
Default

2014-04-20_20.59.48.msq
Its rough but still working on it, here is the MSQ.... I think i May have figured out the fueling issue, the longer my fuel pump runs, it is gradually loosing its ability to maintain base pressure. I noticed this while driving then coming to a stop and seeing my idle afr's at 16.4. I pulled over and adjusted back to 14.5. Drove a little ways, stopped and checked, and it was back to almost the way it was at 16.4. Drove the rest of the way home and sat in the drive and tinkered with my settings again. While doing so i noticed the fuel pump Un-Loading, then the car dies. Pump still runs but built no pressure. Let set for 30 minutes and its like nothing ever happened. So i ordered a new Walbro 255 and see if that makes things any better. Possibly this dying pump is the cause of the high numbers down low in the VE fuel table? And can someone please help me understand how to adjust these God forsaking fuel enrichments please ! No matter what i adjust, at WOT, im hitting 10's and 11 AFRS and im still N/A...
jmuse8482 is offline   Reply With Quote
Old 04-21-2014, 08:37 AM   #11
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,896
Total Cats: 1,792
Default

why would you order a walbro 255?

and what were you fuel pressures you measure when the fuel pump was "unloading"?

and did you log it to make sure it wasn't any enrichments/corrections/poor tuning?

do you just like wasting money and installing annoying buzzing pointless fuel pumps and not solving problems?
Braineack is offline   Reply With Quote
Old 04-21-2014, 09:51 AM   #12
Junior Member
Thread Starter
 
Join Date: Mar 2014
Location: Bartlett, Tn
Posts: 107
Total Cats: 2
Default

Quote:
Originally Posted by Braineack View Post
why would you order a walbro 255?

and what were you fuel pressures you measure when the fuel pump was "unloading"?

and did you log it to make sure it wasn't any enrichments/corrections/poor tuning?

do you just like wasting money and installing annoying buzzing pointless fuel pumps and not solving problems?
By the time i was at a place where i could check, which was in my garage, there car was dead and had no fuel pressure. Pump would come on but pump "nothing" until it sat for 30 minutes. So, to everything else you stated above, no, its pointless without fuel pressure. Wasting money...? Im married so listening to pointless buzzing things that spends my money im used to.
jmuse8482 is offline   Reply With Quote
Old 04-21-2014, 09:54 AM   #13
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,465
Total Cats: 783
Default

Quote:
Originally Posted by jmuse8482 View Post
By the time i was at a place where i could check, which was in my garage, there car was dead and had no fuel pressure. Pump would come on but pump "nothing" until it sat for 30 minutes. So, to everything else you stated above, no, its pointless without fuel pressure. Wasting money...? Im married so listening to pointless buzzing things that spends my money im used to.


You've had problems with the pump on this car before too, yes?
concealer404 is offline   Reply With Quote
Old 04-21-2014, 10:03 AM   #14
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,896
Total Cats: 1,792
Default

Quote:
Originally Posted by jmuse8482 View Post
By the time i was at a place where i could check, which was in my garage, there car was dead and had no fuel pressure. Pump would come on but pump "nothing" until it sat for 30 minutes.
how do you know this?
Braineack is offline   Reply With Quote
Old 04-21-2014, 10:06 AM   #15
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,465
Total Cats: 783
Default

Well... they sell fuel pressure testing kits. I know he's used one in the past on this car.
concealer404 is offline   Reply With Quote
Old 04-21-2014, 10:08 AM   #16
Junior Member
Thread Starter
 
Join Date: Mar 2014
Location: Bartlett, Tn
Posts: 107
Total Cats: 2
Default

Quote:
Originally Posted by concealer404 View Post


You've had problems with the pump on this car before too, yes?
Yeah I have.... It just did'nt click/remember till the problem jumped out and slapped me in the face.
jmuse8482 is offline   Reply With Quote
Old 04-21-2014, 10:08 AM   #17
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,896
Total Cats: 1,792
Default

Quote:
Originally Posted by concealer404 View Post
Well... they sell fuel pressure testing kits. I know he's used one in the past on this car.
Ok. but most people don't just happen to have fuel pressure gauges on their setups to diagnosis an "unloading" fuel pump.

I can think of a few more plausible things within a MS tune that could all the same issues...
Braineack is offline   Reply With Quote
Old 04-21-2014, 10:10 AM   #18
Elite Member
iTrader: (3)
 
concealer404's Avatar
 
Join Date: Aug 2011
Posts: 8,465
Total Cats: 783
Default

Me, too. Especially considering this is an NB.
concealer404 is offline   Reply With Quote
Old 04-21-2014, 10:18 AM   #19
Junior Member
Thread Starter
 
Join Date: Mar 2014
Location: Bartlett, Tn
Posts: 107
Total Cats: 2
Default

Quote:
Originally Posted by Braineack View Post
how do you know this?

Took fuel line off the top of the pump/sending unit and installed my T adapter inline with line and pump. Pump turned on but pumped "0"...... I took sending unit out to verify fuel level just in case and i had 1/2 tank like my gauge said.
jmuse8482 is offline   Reply With Quote
Old 04-21-2014, 10:20 AM   #20
Junior Member
Thread Starter
 
Join Date: Mar 2014
Location: Bartlett, Tn
Posts: 107
Total Cats: 2
Default

Quote:
Originally Posted by Braineack View Post
Ok. but most people don't just happen to have fuel pressure gauges on their setups to diagnosis an "unloading" fuel pump.

I can think of a few more plausible things within a MS tune that could all the same issues...
Yeah but this was pre-existing condition prior to MS. In all the excitement of installing MS, I had completely forgot. It was the end of last summer when this pump had started giving me grief when it got hot... Then winter came and i drove all winter long and it never acted up. Now that it has warmed up outside the issue has re-surfaced.
jmuse8482 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 Yesterday 09:00 PM
Need help - Stock Balancer and Fastforward overlay pulleys Frank_and_Beans Supercharger Discussion 13 09-12-2016 09:17 PM
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM
"Chimney Ethanol" E100 MiataGarage Engine Performance 5 09-30-2015 12:04 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 03:03 PM.