Overboost or going too lean? Try logging lambda actual vs requested.

hi

I have experienced this problem on one car where the injector opening time got to high - in my case the fuelpump couldnt deliver enough and the opening time to meet reqeusted lambda got to high and the ecu started to close the TB

br
Christian

220HP is possible on 180HP stock engine with stock components or on 110kW engine with K04 turbo and maybe injectors - i dont know which you have ...

Turbo and injector size?

of course my friend this is the problem the fuel isn't enought for the engine. Try to log channel 33 the addaptation values of the fuel to see if it is enought. Regards.

Good afternoon.
After searching the web for about 2 months I found your problem which is exactly the same with mine.

2 months ago i bought a used A4 B7 AVANT (8ED) QUATTRO (2005) 1.8T BFB (120kw), which is the logical next step from my previous car which was an A3 8L 1.8T AUM (REVO STAGE 1) (sold with 277.000 km and the 150.000 after tuning)

After upgrading to stage 1 I had the same problems as you in 4,5,6 gear whenever I push the throttle a little more faster than slowly (things start to go bad when turbo pressure builds up).

I have changed a fuel pump , CAT, MAF, cleaned and tested the 270cc injectors, PCV valves, plugs, 2 fuel filters (1 6 bars and 1 original Audi at 4 bars) at a cost of almost 1000 euro.
My pressure is OK and my lambda is OK.

The car is improved somehow (since everything is new), but I still have the problem.

My fuel injectors stay open 25-30 ms in order to deliver the fuel which obviously is not enough.

The tuner said that the car should have delivered 190-200 hp with stock injectors, which obviously is not happening in my case when on 4,5,6 gear and especially when the the road is climbing

How did you solve the problem?
Did use 310 or 380 cc injectors?
If yes did you change the tuning?

I will be more than thankful if you could help.

By the way are you Greek like me?

Thanks in advance.

Thanks for the immediate response.

I have found used injectors of BEX engine (06A906031BA) which are rated at 317cc @ 4 Bar and BAM injectors (06A906031BC) 380cc @ 3 bar at almost the same price (about 100 euro).

BFB has 4 bar FPR inside the fuel filter and no return line. Is it safe using the BAM injectors which are rated at 3 bar?

I also thought of using a fuel filter with 6 bar FPR, since I've heard Audi is using it instead of the 4 bar filter.

Thanks again