Hi

I have been experiencing a boost fluctuation and I dont know if it is my turbo or something else, I have exchanged my wastegate actuator, manifold, bypassed my boost controller and exchanged over to another turbo.

But I always have this fluctuation and I am getting to a point where I dont know what to do next.

If someone has seen anything like it .. please share with me your experience or knowledge

Attached is an AEMlog file and here is a picture of one of my logs
http://s3.frontur.com/img/65126/20070713100040_0.jpg

regards
Gudmundur

 

Try logging "Engine Load" instead of "MAP as Load", see if that looks any different. But the bigger question is, what are you using for boost control? If you are using the AEM to control boost then you need to log those parameters like "Boost Target" "Boost Error" "Boost WG Out" "Boost WG Map", etc...

 

Hi

Thanks for the tip.

I am using AEM truboost to controle the boost, but the fluctuation is the same with my boost controller connected or just running wastegate spring pressure , that is a vacuum hose connected between the wastegate and turbo outlet pipe

regards
Gudmundur

 

try this

with aempro, open your currrent file, save it as something else, then go:
setup/sensors/manifold pressure sensor/options/mapfilter....

what is your value?

i use 8. this is a internal filter for aem & the map sensor.

 

Omg

Thanks so much for the help WOT.
You were dead on, now my engine load is just a fluctuating up and down about 0,3 psi or so.

I have been battling this problem for weeks so you just put a biig smile on my face

thanks again

regards
Gudmundur