Fuel map

[snchin]

Just out of curiosity, would a car with an automatic transmission run a different fuel map than a manual car? This is of course with the assumption that the car is exactly identical, except for just the transmission. Any opinions?

 

[LCP]

It is possible as the torque needs for manual and auto are a bit different at different rpm, but this is entirely up to the manufacturer. Please check also the ignition maps, they go together with the fuel maps.

Sidetrack a bit... IMHO, if remapping, biggest effect will be from ignition mapping, followed by fuel mapping. But both always go together...

 

[snchin]

should be the same

An auto car has actually 2 modules/control units. One for the engine (ECU) and one for the transmission (TCU).

http://en.wikipedia.org/wiki/Transmission_Control_Unit

I am quite certain now that the ECU, controlling the timing, ignition maps and what have you's are the same for both auto and manual for a few reasons.

1. The parts numbers are the same
2. The TCU works hand in hand with the ECU for an auto car. In a manual car, you only need the ECU. You/the driver are now controlling the gearbox.
3. Manual car, running on ex-auto car's ecu has almost ideal air fuel ratio. Variance is due to wear and tear items, or just a dying O2 sensor.

 

[avictar]

Anyone good in remapping for my E46 car? Any suggestions?

 

[Daniel]

avictar,
i have been looking for answers to this question for quite a while.

Please share your views after you have done your enquiries.

Will the ECU detect the new maps from a remap/rechip and compensate for the changes?

I am asking this because i know the ECU will do that with a piggyback.