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Steel1

Advanced Member
Aug 18, 2017
391
126
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49
Connecticut
#43
Ok back for more help.
Got the tune sorted out pretty well except for a low speed bucking issue
that's pretty violent, usually between 1500-2500 RPM light throttle.
Tried increasing timing in that area but no improvement, here's log and tune
any suggestions appreciated, thanks.
 

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a91what

SendMeUrDataLog
Mod Dude
Apr 6, 2011
6,898
4,065
204
29
Hillsborough county
#44
That's usually AE (acceleration enrichment) that needs work...
I will look when I have a moment.. currently out of town learn how to teach... err ah facilitate the learning process.
 

Steel1

Advanced Member
Aug 18, 2017
391
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#45
If anyone has a chance to look at this that would be great. I'm on vacation until Sunday so no rush but would like to get some advice.
 

a91what

SendMeUrDataLog
Mod Dude
Apr 6, 2011
6,898
4,065
204
29
Hillsborough county
#46
Try this out, it looks like the car goes really lean, the datalog you posted was pretty short and hard to get the info from but i did what i could with it.
Do you have an idle issue? looks like your idle is oscillating a bit and is kind of high.
Also need to know if this is a stick or auto??

try this tune and report back
 

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Steel1

Advanced Member
Aug 18, 2017
391
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49
Connecticut
#47
Idle is good and it's a t5.
I'll give it a try when I get home.
Down south visiting colleges with my daughter, thanks
 

Steel1

Advanced Member
Aug 18, 2017
391
126
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49
Connecticut
#48
Excellent results from the latest updated tune, thanks!
The low speed bucking is about 75% gone, only happens briefly under specific conditions but MUCH better overall.
From what I can tell the adjustments you made seemed to lean the tune out in the lower rpm "lugging" range,
which ironically is the opposite of what I was doing..lol still learning.
In an attempt to gain some more tuning knowledge I would like to fine tune that small problem area.
Given the changes you made what area/table do you suggest I look at ? I was thinking of starting by pulling a
little more fuel in the problem zone or increasing target AFR in that area.
To be honest it happens so briefly I still need to pinpoint where in the rpm range.
Thanks again, your knowledge and willingness to give your time are a great asset to this forum !
 

a91what

SendMeUrDataLog
Mod Dude
Apr 6, 2011
6,898
4,065
204
29
Hillsborough county
#49
OK so to give really specific advice i need a datalog to work off of.

now lets talk about some of the things that I changed when i did the tune update.
1.) VE table: i simply smoothed the fuel table above the idle range this was a very minor change and likely affected the tune little
2.) AFR Table: I made large changes in this table but the changes were mainly in the idle and cruise ranges, these have little affect on the acceleration range of the vehicle. I removed the choppiness in this table, you want the AFR table transitions to be smooth and they need to make sense for the load range the engine will see.
3.) AE or acceleration enrichment : this is likely the major factor that fixed your stumble and buck, you may need to add some more to this curve. Like i said above without a datalog to look at it is hard to give you accurate advice.

I need to make a video on how to tune the AE this is a common issue and people have a hard time understanding how it really works and how much it affects the tune....


You can compare the two tunes to see exactly what i changed, hit 'file' then scroll down to 'compare tune' and load the tune you want to compare the current tune to. This will be most effective if you load the old tune then compare it to the tune i sent, you will then be able to really see the small changes i made and how heavily those small changes affected the tune.
 

Steel1

Advanced Member
Aug 18, 2017
391
126
73
49
Connecticut
#50
Awesome thank you !
I now have something to chew on and will do some comparing, yes AE is challenging I have been
messing with it since install but now I have some clear direction.
 

Steel1

Advanced Member
Aug 18, 2017
391
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49
Connecticut
#51
Think I got a better datalog of the bucking issue, definitely better but still there under certain conditions.
This was second gear lugging in a parking lot.
It's not the end of the world I can drive around the issue but any help appreciated.
 

Attachments

a91what

SendMeUrDataLog
Mod Dude
Apr 6, 2011
6,898
4,065
204
29
Hillsborough county
#52
well it looks to me like the fuel table is still in need of some work, and the timing table needs love as well. The timing is most likely going to help the most, you need to adjust the timing up in the lower KPA and RPM areas. You can run as much as 35* at 1400 RPM in the low KPA range.

this lugging [surging] is due to the weak spark you have, and some slightly off settings attempting to turn on CL idle. The CL idle thing is harder to pin down without first addressing the other concerns.

If you like i can send you a picture or a copy of a more suitable timing table I use in My base tunes.
 

Steel1

Advanced Member
Aug 18, 2017
391
126
73
49
Connecticut
#55
Thanks,
Looking at revised tune and I don't see any changes in timing table.
Could you post that picture your base tune timing table so I can compare to mine?
 

a91what

SendMeUrDataLog
Mod Dude
Apr 6, 2011
6,898
4,065
204
29
Hillsborough county
#56
This is the table you have been using, its not bad but has alot of room for improvement.
steel1 current timing table.PNG



This is the table i loaded into your tune file, I use this timing table in 90% of my MS3 based tunes.
Steel1 new timing table.PNG
 

Steel1

Advanced Member
Aug 18, 2017
391
126
73
49
Connecticut
#57
Got it my bad I see it now, not sure why I didn't notice it, thank you.
 

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