Strange datalogging results, any ideas?

[heavyd]

Hello folks, I've been having some issues with my car lately, but I thought they were all solved. So I loaded the PDtuning stage 2 map I had onto the car via my shark performance sts device.
Now it had a lot of overboost and fuel cuts. so I compared it to a bunch of logs that I had done with the same map last year, but as you can see below, the way the boost comes in and dies off is totally different to a year ago, also the fuel rail pressure requests a lot more than it did last year aswell, also the engine load is different?
All the datalogging was done on the same stretch of road, and in the same gear.
Now the way the sts device works is you read your map, then send it to shark. They then run it through some master device, and you get a file back that you can use.
Now my question is, how can the requested values of a map be totally different to what I had a year ago??
The maf values I recorded from the stage 2 map showed 265g/s which equates to ~330bhp aswell
I then loaded the stock map back onto the car to see if my HPFP was on its way out, and as you can see, it copes fine with the stock map?
Has anyone any ideas as to how the map could have changed so much?

Stage 2 map loaded via sts device



Stage 2 map off a year ago, loaded by PDTuning



Stock map

[bacillus]

Odd! 
Can we assume that your cam follower and low fuel pressure sensor (on the hpfp) are ok?

[PDT]

I would reccomend that you let me flash your stage2 map that we made for you rather than trying to use the device to flash it, those logs look nothing like our stg2 requested levels.

Can you log low pressure fuel actual values?

[heavyd]

I logged them in the last log, stock map. They looked ok?

Odd! 
Can we assume that your cam follower and low fuel pressure sensor (on the hpfp) are ok?

The cam follower and the low pressure sensor are new, I also fitted a new in tank fuel pump, fuel filter, and the hpfp has only had about 5months of use from new also.

[martziniuk]

I've noticed mine can request different rail pressure in different logging sessions, maybe it requests more pressure when it's running well?
I would say the 2 bar spike is using the a lot of the fuel the pump can supply and it takes a while for the pump pressure to build up again after this. Your car looks to spool up very quick now but sort that spike out 

[heavyd]

Ive done loads of logs mate. The ones off last year all show the same thing, and this weeks logs are all consistent aswell. I always use the same stretch of road for every log aswell.
I understand the fact that to sort the lambda value out with the extra air, it will just dump loads of fuel in.
Where the boost spike is, the wastegate duty cycle changes sharply, so culd be the cause of the spike

[Saintsteve]

Looks like a fault with the map, rather then being anything Mechanical or Electrical..The cars making top and bottom values with no issue. So i would ditch that particular map your trying.

[Andy]

ONly guessing but that map was made when the engine wasn't running right,will that make a difference now the engine is ok

[Janner_Sy]

If it did it before and after then its the map surely

[heavyd]

If it did it before and after then its the map surely

Have a look at requested fuel rail pressure and boost  in the logs at the top of the page. ie it requests 110bar of fuelling all the way through the rev range, full load, and over 2bar of pressure.
last year, it only requested 110bar of fuel at over 4krpm, less load, and less than 2bar of boost after 3krpm.

[Saintsteve]

that stock map, is that your vw version or a mock version from a remap writer?..

I wouldn't be re-using a remap that was set up for your car when it was sick in the 1st place.

Try get rid and start afresh.

[Janner_Sy]

^^^^^

That's good advice

[heavyd]

It's looking that wAy, yet another remap for my car........
I could always try a BigFish tuning remap! 
Haven't had one of those yet

[Janner_Sy]

APR.....







 

[heavyd]

Too far away sy, plus I haven't heard many good things about their k04 map