I fitted an Akra full ti system to my 2017 last week so that I can fit race fairings. To ensure engine is operating within safe parameters, I decided to fit a fuelling controller and after reading Jays thread, I opted for a Rapid Bike Racing.
I purchased this from Performance Parts and they supplied the unit with Jays map on it. I intended to then dyno the bike to check the fuelling but had a trackday booked first so planned to do that first then go on the dyno after.
The trackday was wet and I ran the bike in rain mode so was not able to get a feel for the pull through the range and top end power. However what I did discover was a few issues with the bike.
There were two occasions where the bike stalled trying to pull away - when I asked for revs, the bike spluttered and died. A switch off and back on rectified the issue both times.
Exiting the pits, I changed to second and after rolling on a neutral throttle, I asked for power and there was a lull before the power kicked in. This occurred on two seperate occasions. The bike ran fine after on both sessions.
The bike stalled when entering the pits and pulling in the clutch as I came to a standstill.
Needless to say, I was a bit concerned after the trackday and eager to get the bike on the dyno.
My bike spent three hours on the dyno yesterday primarily to diagnose these issues and ultimately to get the best map for my bike.
Unfortunately, the dyno testing did not improve anything due to a problem at high RPM. On the first run, when the bike hit 12000 rpm, the limiter kicked in rather violently causing the bike to buck and lurch. It appeared as though the rev limiter on the bike was kicking in too early. It was decided to try another run with the RB bypassed using the RB bypass module. This time the bike went all the way to the redline(well a needle width under the redline which I was told is typical) before the limiter kicked in smoothly. So it looked like a faulty RB. The garage had another RB Racing module so we switched that one onto the bike and tried again but got a similar result - a limiter kicking in early, this time a little lower at 11800 rpm but just as violently.
We did a few more runs, changing to the standard map, baffle in, baffle out, resetting the RB etc but got this false limiter everytime.
If Jay had not had such a great result with his RB I would have said that it does not work with the 17 S1000RR. However in light of his success it looks like both RB modules might be faulty.
So not much gained in terms of fixing the bike but we have concluded that the RB is either faulty or does not work with some 17 RRs.
The stalling issue occurred twice on the dyno too, ust after starting and engaging first gear. The a/f ratio was high idling on both occasions and went high off the scale when power was asked for and then the stall happened.
One thing we did discover is that from 10800 revs upwards without the RB but with the full system, the bike runs incredibly rich - so rich in fact that the tuner was concerned about running the bike with this exhaust without fixing the fuelling. The power curve drops considerably at this point too which could be clearly seen by comparing the curve to other stock and mapped RRs.
The tuner suggested we use a Power Commander instead to fix the richness at high revs and recover the lost power/take advantage of the full system.
I mentioned that I had read on the Internet that the ecu on a 17 would develop a fault if the lamda sensors are disconnected ( a requirement for a PCV). So we decided to test this by disconnected both sensors and doing a dyno run. No errors were reported and the dyno run was as before, revving up to redline.
I have therefore decided to fit a PC and set it up on the dyno. If stock is available in the UK, this will be done this week and I'll report back here.
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