Notices
MEGAsquirt A place to collectively sort out this megasquirt gizmo

RPMs bounce around after gear changes

Thread Tools
 
Search this Thread
 
Old Oct 23, 2016 | 04:54 PM
  #1  
paulen's Avatar
Thread Starter
Newb
 
Joined: Aug 2014
Posts: 8
Total Cats: 0
From: Pullman
Default RPMs bounce around after gear changes

Is this idle relayed problem? Dimitris told me it was lightweight flywheel problem, but I think it needs accel enrich. What do you guys think?


Attached Files
File Type: msl
2016-10-22_22.27.47.msl (4.94 MB, 109 views)
File Type: msq
2016-10-23_paulen.msq (232.3 KB, 95 views)
Old Oct 23, 2016 | 07:19 PM
  #2  
stefanst's Avatar
Senior Member
iTrader: (1)
 
Joined: Sep 2011
Posts: 1,215
Total Cats: 74
From: Lambertville, NJ
Default

I'd say Reverant is right. Also post your spark table. Your advance seem to be varying a lot with the rpm oscillations.
Old Oct 23, 2016 | 08:00 PM
  #3  
paulen's Avatar
Thread Starter
Newb
 
Joined: Aug 2014
Posts: 8
Total Cats: 0
From: Pullman
Default

Attached Images
File Type: bmp
spark table.bmp (1.94 MB, 117 views)
Old Oct 23, 2016 | 08:08 PM
  #4  
stefanst's Avatar
Senior Member
iTrader: (1)
 
Joined: Sep 2011
Posts: 1,215
Total Cats: 74
From: Lambertville, NJ
Default

That looks good- this is not the reason for the rpm-bounce. The bounce in timing is clearly caused by the bounce in RPM. Looks like your drivetrain is winding up like a spring, then releasing, then winding up again......

What type of clutch are you running?
Old Oct 23, 2016 | 09:38 PM
  #5  
paulen's Avatar
Thread Starter
Newb
 
Joined: Aug 2014
Posts: 8
Total Cats: 0
From: Pullman
Default

Originally Posted by stefanst
That looks good- this is not the reason for the rpm-bounce. The bounce in timing is clearly caused by the bounce in RPM. Looks like your drivetrain is winding up like a spring, then releasing, then winding up again......

What type of clutch are you running?
FM stage 2
Old Oct 24, 2016 | 12:28 AM
  #6  
Savington's Avatar
Former Vendor
iTrader: (31)
 
Joined: Nov 2006
Posts: 15,442
Total Cats: 2,106
From: Sunnyvale, CA
Default

It's going very lean after each shift, but the TPS signal is also extremely choppy. That's causing the AE to go on and off.
Old Oct 24, 2016 | 12:47 AM
  #7  
stefanst's Avatar
Senior Member
iTrader: (1)
 
Joined: Sep 2011
Posts: 1,215
Total Cats: 74
From: Lambertville, NJ
Default

My thinking was that the violent shaking of the car, due to the rpm oscillations, caused his foot to oscillate on the pedal a bit, causing the observed effect.
But good catch on the high AFRs. OP: Can you post a log (msl file), so we can look in more detail?
Old Oct 24, 2016 | 01:41 AM
  #8  
Savington's Avatar
Former Vendor
iTrader: (31)
 
Joined: Nov 2006
Posts: 15,442
Total Cats: 2,106
From: Sunnyvale, CA
Default

He attached an MSL to his original post
Old Oct 24, 2016 | 02:19 AM
  #9  
paulen's Avatar
Thread Starter
Newb
 
Joined: Aug 2014
Posts: 8
Total Cats: 0
From: Pullman
Default

Originally Posted by stefanst
My thinking was that the violent shaking of the car, due to the rpm oscillations, caused his foot to oscillate on the pedal a bit, causing the observed effect.
But good catch on the high AFRs. OP: Can you post a log (msl file), so we can look in more detail?
Because the car is shaking, and cant keep my foot on the pedal. and the msq and log is in #1 post.
Old Oct 28, 2016 | 12:09 AM
  #10  
stefanst's Avatar
Senior Member
iTrader: (1)
 
Joined: Sep 2011
Posts: 1,215
Total Cats: 74
From: Lambertville, NJ
Default

I don't think that's your issue, but your AFRs often spike after a shift, going quite lean. Your accel-enrichment seems very poorly tuned. Also your whole VE tbale looks quite weird. what type of fuel system do you have? Is it manifold referenced, or static pressure?
It sill looks to me like you're having some mechanical issues- your whole drive-train is winding up like a spring. Can you run your stock ECU to verify?




All times are GMT -4. The time now is 04:48 PM.