moto

I had my bugeye WRX on a rolling road today and they had to stop the run as it was running dangerously lean.
The car has been modded and remapped. It seems to be running fine.

Any advice on what could be causing this would be appreciated.

Jolly Green Monster

iTrader: (4)

how lean? do you have an afr plot?

moto

Over 12.8 lean.
Will try to post the graph later.

moto

Here's the graphs if you can make them out.

Jolly Green Monster

iTrader: (4)

suggest you get it checked by who ever tuned it

moto

Thanks. I will do.

The way I was thinking was that something mechanical must have gone wrong with the car, as surely the original map is OK and cannot change?
Could you tell me what the possibilities are? Fuel leak, MAF, lambda?

Jolly Green Monster

iTrader: (4)

inlet pipe leak, fuel pressure regulator faulty, fuel pump faulty, maf faulty..

or it was mapped with a fault that is no longer there like an intercooler pipe leak etc..

Simon

moto

Is mapped with a passing VTA dump valve a possibility?

I had some other problems with my VTA passing giving a surging effect and changed it back to standard re-circ.

Jolly Green Monster

iTrader: (4)

yes very possibly

moto

Thanks for your help Simon.

That gives me a good starting point when I take it to the mapper.

Jolly Green Monster

iTrader: (4)

no probs

dynamix

iTrader: (3)

vacuum hose off the fuel pressure regulator?