Pajero Owners Club of South Africa

Hi guys

I've just noticed the diesel chipping thread and 4eP mentioned that there's room for improvement on the petrol motor,so just as a learning curve : What does mapping do/what's it about?

ps, I'm happy with my 3.8,but am curious (I know that killed the cat )

Manufacturers don't utilize the full potential of the motor and thereby stretch the longevity and reliability of the engine.

Mapping changes those parameters to a certain point to gain performance. The more you push it the more unreliable it becomes.

Drag and formula 1 motors are right on the limit and if one thing isn't right they fail catastrophically.

There is recent speculation over VW's new 2.0 bi-turbo diesel where people think too much power is being extracted. This was also the case when the 20v 1.8 turbo petrol engine first made over 140kw. Now is standard figures for NA 1.8 petrol engines.

IMHO - If you are a person that really looks after your car and understand the machanical side of things then mild chips can be very useful for power or economy but remember that you are putting more stress on components that may fail sooner if everything is not kept in order.

Note that for diesel motors the chip can be mapped in various ways - economy, power, valet, city driving etc. Petrol engines don't provide so many different mapping options from what I have seen. Correct me if I am wrong.

Thanks

In other words,chip the motor (daar is nie pille vir my dofness )

it's Monday till 12 tonight!

So,does the cost of it justify the end result,cos now I'm scratching where it doesn't itch.

What would the pro's and con's be of chipping? Besides premature engine failure.

petrol motors have a more involving "map"

chipping a diesel usually means upping the boost and adding extra diesel - do this wrong and you have dangerous EGT's.

Mapping a motor is just fancy talk for setting timing and fuel requirements at different speeds and load factors. From the manufacturers the engine is mapped for a combination of economy and drive ability without over stressing throughout the normal rev range. An after market "chip" is basically a piggyback computer that interferes with the standard map from the engine control unit. In my experience there is no such thing as a free lunch and the same applies to engines, there is usually a trade off for the extra power gained in certain areas whether it be economy , longevity or just loss of power in a different rev range, the secret is to know the cost of the modification. In my plat karre I have programmable ecu's and I can alter the mapping as I choose and have 3 different maps that I have put on them and can change as the situation dictates, not something I would do on my pajero, here reliability remains top and I am not even thinking about altering the chip myself.

PS petrol engines can be set up for the same parameters as diesel you just change different settings get your mixture too lean and you burn valves or run the timing wrong and you have detonation as bad if not worse than high egt.
In short this is an area that it would be wise to tread lightly