N16 SX 2.2dci 136 fuel cut

[Vladko1]

Hi guys, i have a question. I found a similar thread from some time ago but with inssuficient information.
If i carefully play with the throttle while accelarating i can keep the car's boost around 1.4-1.5bar, but when i reach 3900rpm or i give more throttle than needed, the car stalls and the boost goes down to 1.1-1.2 because of a fuel cut. Then the car becomes noisier and smokey.
Also, i did an ECU reset recently, but during the first run the car felt not so responsive and slower, but a bit quiter. Happily the second run felt like before.
I have the same readings from my father's SXE(still no ECU resets done). He has his car since September 2009 and no changes in the boost occured since then.
Last year both cars were cleaned with the best intake sprays i was able to find, also while changing the exhaust gasket on my car, the turbo was taken down and no damaged or dirty parts were observed.
There are people trying to convince me that there is something wrong with the engine. I have driven several 136hp dci N16s and they are having identical readings.
It is interesting that once i've driven 2005 P12 with the same engine and the car is handling very well the high rpms.
I would appreciate any advice. Thanks in advance!

 

[Syv]

Hey, mine does that on occasions too, haven't found the the exact problem but its related to boost sensor. It only reads up to 1.5~ bar and if the turbo is boosting more fuel cut occurs. I did ecu resets, refurbished turbo, cleaned intake and some other things, yet no solution found. It could be faulty boost sensor, I'll be looking into that in coming months. @edk might know more on this one

 

[Vladko1]

Hi mate, thanks for the response.
Today i had the opportunity to drive a little bit faster. There is no fuel cut since the ecu reset last week. Depending on the throttle, the boost goes to 1.5 for a moment or two. Depending on the rpm slowly goes to 1.2-1.3. Gradually drops to 1.0 after 4000rpm. Compared with the accelaration before the reset i feel her now slower in the middle rpm, but a lot faster in the high rpm.
I will do the reset procedure more frequent in future, because i found a person who is good at Denso modifications. The guy will take a test drive and after that will download the engine maps. After a week or so playing with the values, he will upload the new map, will take her for a spin to see what can be optimized more.