Spike in VEtable at ~5000rpm 10Psi - normal? Fuel pump? - 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 05-14-2012, 04:01 AM   #1
Senior Member
Thread Starter
 
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,497
Total Cats: 81
Default Spike in VEtable at ~5000rpm 10Psi - normal? Fuel pump?

Hi guys,

I just did the first longer drive with my new MS3+MS3X last week.

The car definitly drives better than with the DIYPNP (lot's of this should be due to the better noise filtering - which the new DIYPNP firmware also has.

Here is my problem / my concerns...

This is what my VEtable looks like (uncorrected at the undriven edges - so a bit rough) after an hour of driving...

I get this huge spike at 5200 rpm/150kPa



This is what the log shows at this spot


Last row - white line is AFR, red line is AFR target...


The car runs happily at ~12AFR at 4500 rpm and ~140kPa with a VE value of 95 and then the VEanalyze did change the value for 5000rpm (as seen above) to 103 and the car still runs leaner and leaner...

Duty cycle is at 53%...

Could this be my fuelpump crapping out?

Just for information - my spark table... should be o.k.?!


Please tell me your thoughts...

P.S.: Have a look at the flat lines for tpsdot and mapdot, map, etc. the new filtering works perfectly - all the lines are with a lag factor of 90 (I suppose I could go 100 without problems...)
Attached Thumbnails
Spike in VEtable at ~5000rpm 10Psi - normal? Fuel pump?-spark_mx25.jpg   Spike in VEtable at ~5000rpm 10Psi - normal? Fuel pump?-log_screen_100512.jpg   Spike in VEtable at ~5000rpm 10Psi - normal? Fuel pump?-ve_table_100512_uncorrected.jpg   Spike in VEtable at ~5000rpm 10Psi - normal? Fuel pump?-log_screen_100512.jpg  

Last edited by Zaphod; 05-14-2012 at 04:27 AM.
Zaphod is offline   Reply With Quote
Old 05-14-2012, 09:14 PM   #2
I'm Miserable!
 
Join Date: Jun 2009
Location: albany, ga
Posts: 1,869
Total Cats: 3
Default

you know how to tune the undriven edges? low rpm high load? Use the brakes.
I don't care for autotune because the last I used it changed cells that you hit under acceleration so the map would look like crap. under acceleration does your car travel though the point as you boost up?
you have mutiply map on and whats your afrtraget table set to?
Techsalvager is offline   Reply With Quote
Old 05-14-2012, 09:45 PM   #3
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,793
Default

looks like you're running out of injector or fuel pump...your AFRs suck.

I realize you're getting off the throttle a bit, but maybe you're too aggressive with sucked from walls?

Last edited by Braineack; 05-15-2012 at 01:47 AM.
Braineack is offline   Reply With Quote
Old 05-15-2012, 01:31 AM   #4
Senior Member
Thread Starter
 
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,497
Total Cats: 81
Default

Quote:
Originally Posted by Braineack View Post
looks like you're running out of injector or fuel pump
Thats what I think... Fuelpump.

Quote:
...your AFRs suck.
Nah... Only in this particular spot, mostly because see above....

I'm going to post a screenshot from the same log just some seconds before, where I pulled to 6k rpm but 10 kpa less where the AFRs are perfectly fine within 0.1 deviation from the target...
Zaphod is offline   Reply With Quote
Old 05-15-2012, 01:46 AM   #5
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,793
Default

you must not be looking at the same screen shot...

i see it go pig rich then lean out towards redline, looks like possibly high thirteens.
Braineack is offline   Reply With Quote
Old 05-15-2012, 02:48 AM   #6
Senior Member
Thread Starter
 
Join Date: Mar 2006
Location: Schwarzenberg, Germany
Posts: 1,497
Total Cats: 81
Default

Here is a screenshot from the same log only some minutes earlier

Pull to ~6200 rpm at ~140kPa



It only deviates from the target AFR by 0.2-0.3 AFR. I think the rich condition above is due to tuning - the really lean to a dying fuelpump maybe...

@Brain, can I send you the logfile and my MSQ to have a look at it? (The log is ~13MB...)
Attached Thumbnails
Spike in VEtable at ~5000rpm 10Psi - normal? Fuel pump?-log_screen_100512_2.jpg  
Zaphod is offline   Reply With Quote
Old 05-15-2012, 09:25 AM   #7
Boost Czar
iTrader: (61)
 
Braineack's Avatar
 
Join Date: May 2005
Location: Chantilly, VA
Posts: 72,900
Total Cats: 1,793
Default

okay that looks much better.

i don't really see any spike in the gve.
Braineack 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
Walbro 255lph Fuel Pump $50 lsc224 Miata parts for sale/trade 2 10-01-2015 10:17 AM
Bad head gasket or ? shooterschmidty Engine Performance 8 09-30-2015 11:28 PM
why is my car running like pewp? (tune/datalog) itsMikey MSPNP 3 09-28-2015 07:40 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 09:05 AM.