Hey there,

Is it normal for a remapped ( stage 1 ) diesel car with the dpf removed and a completely straight through exhaust to expel black smoke on hard acceleration?

I always thought it was normal but my friend told me that it shouldn't happen and it means the car is over fueling and I should go back to the mapper for a tweak.

I will add it isn't like a smoke cloud nor does it stain my car however it's enough to see a stream of smoke on full hard acceleration.

Also my injector seals need replacing which are getting done in Jan which could also add the smoke.

Just wondered on everyone views/comments?

Car is always maintained and serviced correctly.

Thanks.

A small amount is normal/acceptable.

 

If it's a lot or a constant stream then it's not normal.

 

Black smoke is unburnt diesel so some is normal if you put your foot down in a higher gear as the car has to inject more fuel and wait for turbo to spool etc.

 

Phil

Accelerate hard in most non-DPF equipped diesels and they will smoke.

 

Add a remap to that and there will be more smoke.

 

If the car is high mileage or generally getting on a bit add more smoke.

 

If you have worn injector seals then add even more smoke.

 

My 2002 factory standard BMW 320d would leave a black soot trail on the tarmac if booted hard after a prolonged motorway cruise!

 

Here is a vRS with a DPF delete and stage one remap. Check out the soot on the rear bumper and tailgate...

 

 

Some cars are better / worse than others. Yours sounds normal to me.