I have been wondering about improving the performance of my rover 75 diesel as although it drives nicely it is a bit flat on performance compared to
my last diesel car.
Looking on the net it seems there are lots of diesel tuning boxes but they all seem to just connect to the fuel rail pressure sensor with the
exception f synergy modules which also modify the mass airflow signal if required.
However I cant find any more info other than that, it seems some modules are analog and some digital with a choice of settings.
Thinking about it all that they can do is reduce the signal from the pressure sensor so as the rail runs at a higher pressure and if connected to the
MAF they probably increase the signal from that at low revs to give more fuel.
Im thinking of building a simple module probably using an op amp for the MAF sensor signal and a potentiometer to reduce the signal from the common
rail sensor. Does anyone know anymore or have experience of these units?
Paul.
[Edited on 8/3/10 by paulf]
quote:
Originally posted by paulf
I'm not so sure...!
I'm torn between the two replies so far 
Dan
In the end you will reach the limit of how much fuel can be cleanly burnt and start pouring black soot out the exhaust and you also run up against
the mechanical reliability limits of the engine.
Rover Ron's Synergy 2 probably represent the limit of what can be done also remember that the remapping of the ECU on these engines is fairly
well known territory and can be done via the OBD socket.
Another alternative is an add LPG injection system, as well as adding more fuel this results in cleaner faster combustion giving more power without
the black smoke.
I realize that the engine can be remapped to the 136 spec but it costs about £250 from what i have seen.
I was just looking for some ideas as to how i can gain a few bhp in a low cost manner.
I dont want massive increases as the car has done 223000 miles so dont want to push my luck but the bottom end power is not as good as my 600 diesel
was, once moving its not to bad , im aware of the MAF sensor problems and tried disconnecting it but didn't find any improvement so assuming its
in spec.
Paul.
quote:
Originally posted by britishtrident
In the end you will reach the limit of how much fuel can be cleanly burnt and start pouring black soot out the exhaust and you also run up against the mechanical reliability limits of the engine.
Rover Ron's Synergy 2 probably represent the limit of what can be done also remember that the remapping of the ECU on these engines is fairly well known territory and can be done via the OBD socket.
Another alternative is an add LPG injection system, as well as adding more fuel this results in cleaner faster combustion giving more power without the black smoke.
Even the factory 131hp mapping is very conservative no great problem in taking these engines out to 150 hp
There are maps for this engine out on the internet but because the ECU contains a lot of vehicle specific info including the VIN number you really
want your own MAP doctored rather than one from another vehicle.
Rover Ron is selling the synergy 2 which gives switch selectable power increases up to about 150hp for 179 quid which has to be the way to go.