vag

[chris479]

HI please could anyone advise me if it is possible to alter the ecu envelope to stop the engine going into limp mode because of turbo overboost (spiking) mostly vag diesels thanks.

[z786]

have u tried cleaning the vanes in the turbo??

[chris479]

thanks for the reply yes vnt is working ok at about 100k this is a common fault certain conditions cause overboost and limp mode turn off and back on everything ok I think someone may be able to advise on either lowering boost or allow more boost before mil is activated

[Youneselm]

clean the variable giometry off the turbo.
bey bey error

[chris479]

how do I do that

[mislav88]

remove turbo and clean it

[VRPerformance]

or change the N75 valve + check the vacuum hoses,the hoses from the turbo to the intake manifolt...etc

[Youneselm]

if the vacumm hoses, or N75, or intake manifold is defective or damaged, the car dont pull.
result no charge pressure in engine.
Overboost is only, generated by the geometry in turbo that blocks in the high pressure position.
TAKE OFF TURBO AND CLEAN THE VARIABLE GEOMETRY, AND JOB DONE.

[z786]

thats what i said, CLEAN THE VANES

[VRPerformance]

if the vacumm hoses, or N75, or intake manifold is defective or damaged, the car dont pull.
result no charge pressure in engine.
Overboost is only, generated by the geometry in turbo that blocks in the high pressure position.
TAKE OFF TURBO AND CLEAN THE VARIABLE GEOMETRY, AND JOB DONE.

you are not right,also if the N75 valve is damaged the car will overboost!

[ecutuners]

Listen to z786 hes right, its the veins sticking

[pablo1971]

OR A UNDER PERFORMING N75 VALVE.......the n75 are cheap enough,try and replace it,check all pipes

[chris479]

read the post please, turbo is clean, vacuum pipes are ok, it is not n75 it is the later square black boost unit on bulkhead it is ok. as I said these systems at about 100k must wear a little and cause overboost in certain conditions, I would like to know if it is possible to alter software to keep the light out

[furnata]

You can set boost limiter higher i mean SVBL

[paddyp]

If it is just 'wear' all you have to do is adjust the actuator rod 10mm spannner open the lock nut and turn to make the rod longer .. done.