ST4S With FIM 5.9M Replacement ECU
Something many have been waiting for, this is a new ECU manufactured by FIM, using Weber Marelli based software (so it works with all std diagnostic tools) and adjustable with FIM software just like that for custom mapping the Weber 1.5M ECU, found in SS/M ie models. Fitted with the right connectors, this ECU may even make a good 1.6M replacement (or P7 for the 851?), given the number of them that seem to blow up (mainly Guzzi ones it seems).
For more info, go to the FIM/Ultimap website : www.fuelinmoto.com.au
So, we gave Duane a ST4S with cam timing on spec and a clean fuel filter, and off he went. A couple of weeks later he bought it back to town, and I met him at the dyno for the moment of truth. He has maps for two set ups, simply being slip on mufflers with std airbox lid, and slip on mufflers with open airbox lid. The open airbox lid is becoming much more accepted these days as a way to get some more power, although it does make quite a bit of noise. Up to the owner, really.
The next graph shows the torque and lambda curves for these runs. I have a couple of reservations about the accuracy of the lambda curve for the after (red) run, as it seems to start a bit later than the others. It also shows the variation between what the dyno lambda sensor reads and what Duane gets with his probes (one in each header, close to the exhaust port) in an on road situation. With these maps, the on road result is a flat lambda reading all through the range.
Next we ran it with the open airbox lid and corresponding map in the ECU. This pair of graphs shows the same curves as the previous graphs, with the open airbox lid curve added in yellow. There is an increase of up to 5 Hp in places through the range, in line with results Ive seen from other bikes when run with open airbox lids.
Next is the corresponding torque graph. I havent included the lambda curves, as the yellow curve pretty much mirrors the "red" one from the previous torque graph, and with them the graph gets rather crowded. The increase at the torque peak (7,000 RPM) is around 12% better than this bike had in "as delivered with slip ons" trim. This is rather noticeable on the road, although there is more noise too. Depends on how you like it. The basic shape of the curves has not changed through all the mods, which is expected given that all weve done has been minor cam timing, airbox lid and ECU mods.
The next graph shows the full before/after for this job, both power and torque. Keep in mind the before is with Staintune mufflers fitted, and the changes are those stated above (cam timing, airbox lid and ECU). Not much work for a change that looks very impressive on paper, and rides just as nicely on the road. Readers need to remember that a well mapped chip or ECU will make its impact felt all through the RPM/Throttle range, not just at WOT as these graphs show. On that point, the man who owns this bike is very happy, and rather impressed given his somewhat cynical view of how much difference an ECU could make prior to the mapping being done. He reports the bike feels much stronger, particularly in mid range roll ons the area he spends most of his time in. Its ability to cope more easily with a pillion (and still be pretty damn quick) was also something he was quite surprised, and very impressed with. Green is before, red is after.
Comparing this bike to the one from the previous DP kit report, we see quite a bit of difference in the under 8,000 RPM range. Why Im not really sure, as the DP ECU had a good lambda curve (on the dyno at least) as well. Obviously better fuel and ignition timing settings in the FIM ECU, making quite a bit of difference. Certainly apparent on the dyno anyway. Ive included the before runs for the two bikes featured too, just to show how they compare. Green is before, red after for the FIM ECU bike. Yellow is before, blue is after for the DP kit bike. So you can see that, in std (well, std with slip on mufflers) trim, the bike that got the DP kit was a bit stronger. Being that the DP kitted bike was a 03 model, with its std adjustable cam pullies, I would expect the cam timing on that bike to be very close to what we set the FIM ECU bike to. The DP ECU is available from Ducati Performance as a separate part (to the complete kit), for around twice the price of the FIM ECU. Which makes the decision very easy.
Next is the corresponding torque graph. Those 4 or so extra ft-lbs. under 7,000 RPM will make the FIM ECUd bike feel very fat indeed.
From the shown graphs, Duane definitely has reason to be happy with his efforts, as the results pretty much speak for themselves. An adjustable 5.9M ECU is something Im happy to see as well. All we need to do now is a whole lot of testing to get base spec maps for the various models, then we can start playing with them all. Lots of seriously good fun.