Hi

My setup is basically a 20G-9LT with supporting mods.

20G-9LT
AEM Truboost - boost controller
AEM EMS
SBR FMIC
Buschur IC pipes
HKS 272 cams
PTE 780cc injectors
Walbro 255 fuel pump


Before I installed my AEM EMS I knew I had some boost fluctuation but it was hard to see properly on my gauge, but at that time looking at EVOscan logs I was able to see that boost was jumping up and down.

I just finished installing my AEM EMS and have just started tuning, the tune is still really rich and I was trying to work out a calibration for my knock sensor but it is kinda hard when I have so much boost fluctuation (or atleast I think so not an expert )

I am starting to think it is either my boost controller , just not sure so I wanted to check if anyone has seen a problem like this before

Here is a picture of my log




regards
Gudmundur

 

So are you running the FP HD actuator or the stock IX actuator on your LT? Did you check to see what your preload level is on the WGA? At least, did you remove the cotter pin on the WGA rod and check to see if it was setup too loose by FP? Could be that it needs the WGA rod adjusted shorter.

If you've got the stock actuator and they set it up loose, then it could be that the flapper valve is bouncing up and down on its seat causing exhaust pressure within the turbine housing to oscillate. Just my $.02.

 

Hi thanks for the suggestion

I am running the stock actuator.
I already checked the preload on the actuator and it is 3 turns tighter than just fitting, but just to check I am going to tighten it a bit more and see if that changes my problem.

 

What you describe may very well have little or nothing to do with the WGA. Maybe it´s AEM EMS related. There´s a subforum on this site dedicated to the AEM EMS and there are a lot of savvy guys on there that can help you troubleshoot the problem. Good luck

 

Hi

No I am certain that it is not AEM EMS related since I had the same issue before I installed the AEM EMS ... I saw my boost flutter .. but I didnt have the boost logging capability.

 

I tried tightening my WG actuator rod, and I also tried disconnecting my boost controller from my wastegate (with a boost cut @ 24psi set in AEM EMS).
And I still have the same fluctuation

I guess no one has heard of anything like this before