So-called Performance Chips
tor_ake
Active Member
- Joined
- Jun 19, 2012
- Messages
- 81
- Car
- C180 Kompressor 2003
"performance chips" in Motronic engine management usually means altering the fuel maps, of which there are three: main, idle and full throttle. Full throttle is already ideal, not much to do there, idle is no use messing with. Main map can be leaned out a little in some areas, but to marginal gains as the system will adapt using the oxygen sensor(s).
The main change is to the main ignition advance map, where they usually advance the ignition by a few degrees almost all over. This yields a few Nm and thereby, for a given constant speed fuel economy improves, but not by a lot. On a good day, 5%
Is it worth it? For most people - No.
Oh but wait, they are also often able to remove the 250Km/h limiter, that might be worth it all to some.
The main change is to the main ignition advance map, where they usually advance the ignition by a few degrees almost all over. This yields a few Nm and thereby, for a given constant speed fuel economy improves, but not by a lot. On a good day, 5%
Is it worth it? For most people - No.
Oh but wait, they are also often able to remove the 250Km/h limiter, that might be worth it all to some.
Sp!ke
Administrator
What they said.
Not much to be gained if any on your SL. (assume we are talking about your SL500 here?)
Better fuel savings would be achieved with a lighter right foot or simply keeping on top of tyre pressures.
If you had a Turbo Diesel however, then the scope for improvement is significantly better.
Not much to be gained if any on your SL. (assume we are talking about your SL500 here?)
Better fuel savings would be achieved with a lighter right foot or simply keeping on top of tyre pressures.
If you had a Turbo Diesel however, then the scope for improvement is significantly better.
bedwards1966
Active Member
You have an SL500, yet your worrying about the fuel economy...?
I would not bother with one, they're often just a resistor that fools the ECU into thinking more air is entering the engine so it injects more fuel, it can make a difference to performance but I expect the fuel economy is likely to go down - I certainly would not expect it to improve.
A remap might improve things, but a chip is probably just money down the drain if you'd like to save some fuel.
I would not bother with one, they're often just a resistor that fools the ECU into thinking more air is entering the engine so it injects more fuel, it can make a difference to performance but I expect the fuel economy is likely to go down - I certainly would not expect it to improve.
A remap might improve things, but a chip is probably just money down the drain if you'd like to save some fuel.
