RossVVC said:
General spec of MEMS3 as fitted to TF incl VVC
The engine is governed by the Modular Engine Management System Version 3 (MEMS 3)....it is a sequential, multipoint fuel injection system controlled by the Engine Control Module (ECM) yatter yatter yatter.......
The ECM uses numerous sensors to control the operation of the:
- Fuel system
- Ignition system
- Variable Valve Control (VVC) system (where applicable)
- Evaporative Emissions (EVAP) system
- Engine cooling fan(s)
- Air Conditioning (A/C) (where applicable)
- Steptronic Electro Mechanical Constantly Variable Transmission (EM-CVT) (where applicable)
The ECM uses the speed/density method of air flow measurement to calculate fuel delivery. This method calculates the density of intake air by measuring its pressure and temperature. The density signal, combined with the engine speed signal, allows the ECM to make a calculation of the air volume being inducted and determine the quantity of fuel to be injected to give the correct air/fuel ratio.
Fuel quantity control.....
The precise quantity of fuel delivered is controlled by the ECM adjusting the duration of the injector open time. To achieve optimum performance the ECM is able to "learn" the individual characteristics of an engine and adapt the fuelling strategy to suit.
(Theres also a sensor (cant remember its damn name!)that alters the fuelling to maintain the correct mixture of exhaust gases).
Theres a whole barrel of **** that mems and the ECM moniter and alter to suit but theyre the main "suspects".
I think that might help to answer the question as to "lean fuel delivery".The other types of MEMS are similar in operation to mems3 but only vary in number/types/position of sensors...but its all basically the same.
IMO just the usually throttle/induction kit/exhaust/fuel pressure regulator upgrade isnt goint to affect the ability of the injectors to provide enough fuel as they can just open for longer.My experiance is with fords though,and only when a 1.6i was modded up to a 2.0i/phase3/with massive turbo/intercooler/water injection etc etc etc ....did it require larger injectors...when it was just upgraded to the 2litre half engine+phase3 head the RR report showed fuelling wasnt a problem at all......only with the turbo did we need a new fuel pump/regulator/filter/injectors PLUS another injector in the manifold!!!!lol
So to sum up....minor upgrades-dont bother.With massive overbores/forced induction then probably.
The first time I read the ad it seemed a bit misleading,but when I read the other time I could see what he was on about.
Any thoughts anyone???
DISCLAIMER
I have been known on occasion to be wrong!