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Patch request discussion: rev-down maf clamp (stalling issue)

 
Old Jan 20, 2010, 09:48 PM
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I also have this annoying idle dip stumble issue when coming to a stop. Would like to see a easy patch fix.



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Old Jan 20, 2010, 10:16 PM
  #17  
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I think collection of criteria is a hard part in this approach as well.

I would rather implement dynamic correction of MAF according to MDP (actually takiing advantage of both MAP and MAF worlds), but I cannot tell the consequences.
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Old Jan 21, 2010, 04:30 AM
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My .02

The idle dip, from my experience, has been related to the 0 load cell timing and the decel fuel cut delay tables. If you remove the 0 load cell the engine tries to interpolate where it should be. The conditions are always different during decel so the ECU never has a series of timing cells to go by. Also, if the decel tables are too high or too low there is issues on run down.

I see that a lot of "tuners" remove the 0 load cell, and several other drivability region loads. I do not recommend this.

I may be completely wrong....but this is what I believe the issues are from.

For me, I believe that anyone can basically tune for a WOT pull, but tuning for drivability seems much more important. After all, most people want both.

Paul
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Old Jan 21, 2010, 05:22 AM
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Originally Posted by l2r99gst View Post
I agree speed density is the ultimate solution. As a matter of act, when I had this problem with my DSM, I compeltely solved it by installing a GM MAF in blow-though.

However, I think we should be able to code this relatively simply. One of the devices that I was mentioning that does this sort of thing is the HKS EIDS. All it has is an input for the MAF Hz and TPS. So, I'm sure it's doing something along the lines of what I was mentioning above.

I think it would be good to include coolant temp and AC on/off just so cold start and AC conditions wouldn't be affected.


Eric
FYI I had an EIDS back in the day on my 8. It sucked. It did not work under any level of adjustment and made low speed driving very odd. Not to be a harp again... but this is something that ECU+ does very well. (so glad that I have one)

Edit, here's a page from the manual on how the ECU+'s version works.
http://cid-a5ff1875a08be401.skydrive...anti-stall.pdf

Last edited by honki24; Jan 21, 2010 at 05:37 AM.
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Old Jan 21, 2010, 06:45 AM
  #20  
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This is a pretty old thread. This isn't needed anymore with the implementation of the SD patch.
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Old Feb 13, 2010, 08:42 PM
  #21  
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Originally Posted by Appauldd View Post
My .02

The idle dip, from my experience, has been related to the 0 load cell timing and the decel fuel cut delay tables. If you remove the 0 load cell the engine tries to interpolate where it should be. The conditions are always different during decel so the ECU never has a series of timing cells to go by. Also, if the decel tables are too high or too low there is issues on run down.

I see that a lot of "tuners" remove the 0 load cell, and several other drivability region loads. I do not recommend this.

I may be completely wrong....but this is what I believe the issues are from.

For me, I believe that anyone can basically tune for a WOT pull, but tuning for drivability seems much more important. After all, most people want both.

Paul
I readded the 0 column for timing and still no change. Which "decel tables are you speaking of?

I would really love to see a fix for this for us MAF users as I have no interest in going SD at this time.

Last edited by tnt1106; Apr 28, 2010 at 10:30 AM.
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Old Feb 16, 2010, 12:37 PM
  #22  
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im have the same issues i think due to cams, any more insight?
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Old Apr 27, 2010, 04:04 PM
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convert to SD still same issue (only with a/c on) rock solid with a/c off since SD. I have tried every posted suggestion thus far I have found.


edit: ISCV tables with rpm control suggested from another thread seem to be helping.

Last edited by tnt1106; Apr 28, 2010 at 10:23 AM.
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Old Apr 11, 2011, 07:21 PM
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Reviving this thread. Any solutions besides SD or a blow thru MAF? I run 94170715 My car consistently stalls if I clutch in after giving a little gas (happens in parking lots or the driveway).
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Old Apr 11, 2011, 10:52 PM
  #25  
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Look at a stock timing map. Notice a strange bump in timing thats completely out of place in the 0-1000rpm/60load area? This is for decel catch. If you have cams, large injectors or both, this area can SOMETIMES be adjusted to aid a bit as the fuel is being re-applied by the ECU.

-Jamie
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Old May 31, 2011, 08:51 AM
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Originally Posted by tnt1106 View Post
I readded the 0 column for timing and still no change. Which "decel tables are you speaking of?

I would really love to see a fix for this for us MAF users as I have no interest in going SD at this time.
I tried this as well. Adding the zero load row back to the bigmaps does not affect the idle stumble.
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Old May 31, 2011, 12:24 PM
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it seems like there are a lot of us with this problem

coming to a stop next to some ladies is usually awesome....unless I stall or my wife is in the car (I'm pretending she isn't over my shoulder right now)
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Old Aug 11, 2011, 03:27 PM
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I am also reviving this thread, as I am on a stock rom but having the same exact issue. Has anyone EVER found a good fix as I have been searching and searching to no avail.
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Old Aug 11, 2011, 03:50 PM
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I never found a solution to the idle stumble with Tephra. Switching back to my tuned stock rom completely eliminated all idle stumble.
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Old Aug 11, 2011, 05:51 PM
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Post a log of your car stumbling at idle during decel. DataLog the following: Timing, Airflow HZ, RPM and Load. I will see if I can't help out. The key is to find the engine load your car is seeing during the 'stumble'. It will most likely be between 60-90 load, around 500-1000 rpm.


-Jamie

Last edited by Dynotech Tuning; Aug 11, 2011 at 05:55 PM.
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