Yeah mine was thoroughly Checked for leaks, I only used the one extension cable as well, and it's the new updated one. My thoughts were because it's only during a light load, that it's the bov opening up a little and confusing the mafs? That's why I was thinking sd tune would fix it. Be a couple months before the snow melts before I find out :( unless you figure it out first! Haha. Btw, did yours get worse as you drove it from initial tune? When I first picked it up my tuner was the only one that noticed it on his drive home, 2 months later I noticed it once, 3 months later it did it in every gear. Rechecked for boost leaks, holds 15 lbs with no leaks. Sadly no boost gauges or afr gauges yet to see if anything goes weird during issue.


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Yes it actually has gotten worse since then. But I've been datalogging and adjusting the tune with Jon at z1. Nothing helps

My tial doesn't close until high rpm range, so it couldn't be that right? Since that's not a light load lol

Update: Installed the new Stillen cables, wrapped it aluminum tape. Didn't fix the issue.

Jon@Z1 say he can see the issue from my datalogs and is going to connect via teamviewer later on and watch the issue more closely. He says the he can fix it, even if the BPV is messing with the MAF.

My tuner could see it as well, made adjustments but didn't seem to help. Atleast you have the best uprev tuner working on yours, so if it is a tuning issue, he will fix it.


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I will keep you updated, he says he is able to trick the MAFs. Fingers crossed!

Update 1/13/18: So Jon and I drove around for awhile, while he did live tuning. He could see every single jerk and jump as soon as it happen and he adjusted and smoothed them out section by section of the throttle load.
As you guessed, the Tial BPV is causing some of the jerks, right at the point were it closes/opens under light load, confusing the MAFs. He was able to trick the MAFs in that area though to help the jerking. The issue is about 90% better, SD I would say is the only way to 100% the issue.

In short, if your uprev tuner is good, they should be able to smooth everything out for the most part.

Kinda figured as much! Glad you were able to smoothen it out for the most part!


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Due to the fact the jerking still exists, I will probably be making the switch to ecuTEK.

could you switch to recirc valves and solve the issue as well?

That question would be better suited for either Aaron, or some experienced tuners. This Tial BPV can be a recirc, I just have it open dump.

If you decide to go EcuTek, Seb at SpecialtyZ is your man! His base line tune for the A2A is very drivable, and then he starts tuning for power.

I was a bit leary about remote tuning but I found it easy and Seb is very responsive to get your tune dialed in safely.

We have been discussing the issue for the past for days actually.