don't know if any one is having this issue or has had an issue similar to mine running a boosted sling. I'm running alpha setup with their manifold i love it and have zero complaints , i just recently had my ecm sent to bob for most current tune, i sent it out because i was having an issue when shifting into second and third at a higher rpm usually close to 6k. believe they called it the 6k flat . my issue i guess kinda hard to describe but not sure if its like my motor getting flooded out or what but it will like bog out like the power to the motor is just like cut then comes right back. so that was addressed with the latest tune but now i feel like its happening at a lower rpm and mostly shifting in to second like around 3-4k spoke to bob he said the tune is right and check all my connections. and most of my numbers seem right.my a/f is where it should be on a regular load bouncing around where it should be and vacuum goes back and forth between -19and-20 so not sure whats going on.just did different plugs which henry suggested,new map sensor tightened a lose manifold to turbo bolt which i thought could have been the issue and new 02 sensors don't know what else to do. just wondering if anyone out there had this issue at all its driving me nuts
motor cutting out
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Check the blow off valve. It sounds like your not getting rid of all the boost between high rpm shifts.
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What kind of BOV do you have
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You will be checking to see if it is opening at the exact time it's supposed to. And you don't want a lethargic BOV. That will get you the symptoms of a big in between gears. Almost a stumble.
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You have a Tial blow off valve and that most likely isnt the issue.
Get video or log AFR numbers during these "stumbles". Note RPM, PSI, and most importantly the AFR number. If you are dipping below 10AFR, you most likely have fuel enrichment issues. -
I'm just throwing something out there. Have you tried turning off traction control?
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If you have the failsafe then you need to plug it into a laptop, clear the logs and go for a ride and put it in a situation where its doing your issue.
I assume you have the rpm wire hooked up kn the AEM? If not, get it done.
Got a friend with an Alpha on 2 bar map, does the exact same thing on some shifts. Looking at the logs, we can see it goes rich into the 9s for some moment before coming back alive.
I had the same issue on my VI kit, fixed it by putting a 1 level stronger kn the bov.
Then got fed up of the gremlins of a canned tune and working on an ecu I can't tune and chucked the ecu to install a Haltech Elite.
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That's my lowest number on this run
sorry about the glare I'm outside -
Sorry "kn" is a typo, fingers too big for stupid iPhone keyboard. Lol
You don't need to upgrade anything, but you can set the dump valve reaction pressure by swapping springs. Make sure the right one is in there, I am not familir with alpha spring color.
1st thing I would suggest is the view your logs in AEM Data software and not the table for the failsafe because it doesn't give you a pattern.
On AEM data, you can view data more precise, and also you can playback the sequence, so you can actually see the rpm at 5800 then go down to 4200 on the shift and the associated AFR and map reading so you know you are looking at the right spot.
The way you see it now, its impossible to know if that splash of dots is just caused by lifting your foot off the throttle and coasting or if its at wot shift.
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Always have traction control on. It will slip out from under you if you don't have it on...
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You can download the log to your laptop and send me the file. I can look at it from here.
The AEM logs around 2h of run time, so you should clear the log before a ride and try to get it to stutter, once you have it happen, download the log to your laptop right away so we know to look at the end of the log for the issue.
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Its not a BOV issue, it is a fuel enrichment issue.
You are experiencing fuel bog with the AFRs you are showing.
I'll get with Mefiburn Bob and get some updates worked out with new fuel enrichment at lower RPMs.
I'll get with him next week. Call him late next week.
