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Stage 1 - What's going on?


BigInALegacy

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So I'm running a TA Stage 1 e-tune map. For some reason, I'm getting this "stutter" sometimes, mostly when the car is going uphill, and mostly in the 40-55mph range, or ALWAYS going 70mph. If I give it gas, or downshift it stops... but none the less, its certainly not right.

 

Mike's looked at it a couple times, last time we were able to log it and he made some changes. Even though its probably got better on each of my visits, it's still VERY present. And let me just say, Mike's been good in having me down to look at it and fine tune it, even though it's just an e-tune map. I'm planning on taking another visit to see Mike sooner than later and hopefully get it worked out.

 

Sooo... can anyone shed some light on WTF is going on? Hopefully these links to my logs work. Datalogs were taking when trying to capture the "stutter". I could do some hard 3rd gear pulls too if that would help.

 

TIA for any insight. It's muchly appreciated.

 

http://www.mediafire.com/file/4m11jnjfdmn/datalog6.csv

http://www.mediafire.com/file/ddeynynn5nj/datalog7.csv

http://www.mediafire.com/file/mtmtggoe0in/datalog8.csv

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Tuning Alliance Stage 1 E-tune (with a few changes from mike after logging) / 93 octane

 

Not so much a turbo lag stutter... best way i can describe the feeling is comparing it to when your driving a manual and your in too high of a gear, the feeling you get when you try to give it gas. Only thing is that my car's an Automatic. Happens in Drive or SportShift. :confused:

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Taking a quick look.. your load is almost nil as well as your boost (in this case vacuum) So yes.. 20 AFR is fine, I wouldn't be worried about blowing up quite yet :) Looks like your car is just cutting out at a low RPM (around 2500 rpm). As to why.. haven't figured it out yet. I'm sure Infamous1 is def. the one to answer this.. but I think we might have to try to log more things.
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Alright, well at least that makes me feel better... (insert sigh of relief)

 

If there are some more/less parameters I should be logging, let me know and I'll get some new logs ASAP.

 

I'm also heading out in a short, so I'll leave the map on for now, and try to get a good 3rd gear pull tonight and post it here tomorrow.

 

Thank you, thank you, thank you for your help guys. I can't stress it enough. :D

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Is this the magical studder that people are talking about, or is this some other related problem? I haven't read up much on this studder myself..

 

But, another question, is this happening only on partial throttle? I assume so since you said going uphill at 45-50mph, but what about the 70mph part?

 

Are you starting to build boost and then it's happening?

 

Could be a mechanical thing such as a boost leak in your system or even your BOV..

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No, not the magical stutter, that was gone with the new map.

 

the only times its prevelant enough for me to notice, is about 45-50 sometimes, and I can duplicate the stutter 95% of the time on the highway at 70mph if there's any incline (i assume because of the additional load). I'd say around the 2000-2750 RPM range when I go to pick up more speed at a 70mph cruise.

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Taking a quick look.. your load is almost nil as well as your boost (in this case vacuum) So yes.. 20 AFR is fine, I wouldn't be worried about blowing up quite yet :) Looks like your car is just cutting out at a low RPM (around 2500 rpm). As to why.. haven't figured it out yet. I'm sure Infamous1 is def. the one to answer this.. but I think we might have to try to log more things.

I would say not enough fuel. But i am running a stage 2 tune on stock injectors, and a stock fuel pump.

13.6 @ 102 untuned FTW

SmartWax - Spec Clutch - Team Scp 1

http://newenglandsubarus.com/

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No, not the magical stutter, that was gone with the new map.

 

the only times its prevelant enough for me to notice, is about 45-50 sometimes, and I can duplicate the stutter 95% of the time on the highway at 70mph if there's any incline (i assume because of the additional load). I'd say around the 2000-2750 RPM range when I go to pick up more speed at a 70mph cruise.

I know you said its not turbo lag.. but that where my stock turbo lags. maybe your injectors are clogged up. Try some fuel injector cleaner from GUM OUT.

13.6 @ 102 untuned FTW

SmartWax - Spec Clutch - Team Scp 1

http://newenglandsubarus.com/

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More logs as promised... first 2 are 3rd gear pulls, got as high into RPMs as i could given the conditions. The last is another log of the stutter, this time I logged a few more parameters as well, including knock correction.

 

http://www.mediafire.com/file/end2mr0ojvy/3rdGearWOT1.csv

http://www.mediafire.com/file/inzromhnemm/3rdGearWOT2.csv

http://www.mediafire.com/file/jmmomcmnhny/Stutter1.csv

 

LMK what you think...

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