Having boost oscillations under WOT

[DCT_JAY]

Not sure what could be causing this issue, i already checked everything for boost leaks, had one on the tmap sensor with a busted O ring and then replaced my stock diverter valves with a new Tial BOV and still have the issue. Spark plugs are needing a change and doing those when i get paid but i dont think thats whats causing my issue.

Any ideas ?

datazap.me | Jay335IS

datazap.me

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[doublespaces]

Seems like your wgdc is jumping around. Mods? What does your tuner say?

 

[DCT_JAY]

Seems like your wgdc is jumping around. Mods? What does your tuner say?
View attachment 31125

FBO (w inlets and outlets) with vrsf 3.5 exhaust , upgraded lpfp, about to put all new injector 12's in aswell. He suggested i had a boost leak witch i did and fixed ( Tmap sensor boost leak ) but im still having this oscillation

 

[doublespaces]

FBO (w inlets and outlets) with vrsf 3.5 exhaust , upgraded lpfp, about to put all new injector 12's in aswell. He suggested i had a boost leak witch i did and fixed ( Tmap sensor boost leak ) but im still having this oscillation

And your tuner still insists you have a leak?

 

[DCT_JAY]

And your tuner still insists you have a leak?

no i sent a email yesterday, im sure he is busy haven't heard back

 

[Jeffman]

So was the car running normally on the existing tune before this happened?

 

[Asbjorn]

My wgdc also oscillates like this when I have a leak. We share the same tuner.

Could still be the tmap leaking. There might be an imperfection down there that cuts the o-ring. I have replaced my o-ring like 5 times, it would often come out broken until we cleaned it properly and used the right size ring. Eventually I sealed it up. Also sealed the bolts, as oil indicated there was a leak through the lower one. When my tmap leaked it was only 1-3psi and didn't show when smoke testing, but you could hear the air escaping when rocking it a bit.

 

[DCT_JAY]

So was the car running normally on the existing tune before this happened?

hard to tell i had a boost leak for a while but the bucking at low throttle and wot was kinda always there , just not this bad.

 

[DCT_JAY]

My wgdc also oscillates like this when I have a leak. We share the same tuner.

Could still be the tmap leaking. There might be an imperfection down there that cuts the o-ring. I have replaced my o-ring like 5 times, it would often come out broken until we cleaned it properly and used the right size ring. Eventually I sealed it up. Also sealed the bolts, as oil indicated there was a leak through the lower one. When my tmap leaked it was only 1-3psi and didn't show when smoke testing, but you could hear the air escaping when rocking it a bit.

View attachment 31225

exactly what happened to me bro ! , ill look at it again today and check. i also put threadlock and sealant over the bolts to ensure no leaks cause mine was at only 1 psi when we smoke tested ! imagine full boost

 

[DCT_JAY]

quick update, took my car to BMW to have all of the injectors replaced because i suspected they were pretty bad.

datazap.me | Jay335IS

datazap.me

good news is, it fixed most of my issue and actually made alot more boost and felt alot smoother even without the new plugs yet (was literally on my way to get them replaced and took these logs after driving 60 miles to let the car adapt to the injectors). Bad news is, i think from the previous issues the surge fucked up the thrust bearing in the front turbo and is now toast so..... i guess im moving to upgraded twins now.