R1200GS with Remus full system and Wunderlich/Dobeck tuning unit - Written May ‘07

Summary: dyno runs for a R1200GS all std, with Remus full system and then with a Wunderlich badged Dobeck Gen3 tuning unit.  Also includes staged feedback from the owner at the end of the report.

The first time I’ve played with a 1200GS in detail, I took this opportunity to also try a Dobeck tuning unit sold under the Wunderlich brand.  This is one of the new Dobeck Gen3 units with the 3 buttons and 8 LED on the front and no adjustable pots.  In this instance, the unit appears to work very much the same as the older unit did.  These units also have a Lambda sensor signal manipulation feature, that tells the ECU something other than what is really happening to make then run a little richer on cruise when the bike is otherwise running closed loop.  As such, they’re more expensive (the number of connectors would impact this quite a bit) than the older box, retailing at AU$600.

The Remus full system is just that, running from the heads back and removing the catalytic convertor under the engine.  Quite a bit lighter than the original exhaust, and provided with a baffle should you prefer.  Full systems are also available from Staintune.

The first graph shows a comparison between this bike and the one used in the previous R1200GS report, both all std.  I have added the update below to that report:

Since this report was first written I’ve dynod more R1200GS, and my suspicion that the bike featured here was down on power has been confirmed.  Why it’s down I expect has to do with the fact it was a demo bike and as such sometimes filled with fuel by people test riding it who didn’t want to pay for premium.  So I’d recommend interpreting this report as what happens to your 1200GS power wise when you use normal unleaded fuel.

So with that in mind, green is this bike, red the previous bike.

We did this bike in 4 stages, with 3 sets of dyno runs.  First up we dynod it all std, then fitted the Remus system and dynod again.  Once the owner had ridden it for a while and gained a feel for the changes we added the Wunderlich unit using the provided setup info and the owner took it away to try.  Then after a little while we dynod it again and tried some different settings on the Wunderlich unit to see if they helped, based on the dyno results and the owner’s feedback.

The next graphs show the result.  You will notice the dip on the blue line from 6,750 RPM to 7,500 RPM.  Dave who owns the dyno said he had also seen this before, and was told by the Dobeck importer that it’s related to the ABS being upset by the dyno, due to the rear wheel spinning and the front not.  I’m not sure if I believe that, but Dave said he disconnected and reconnected the Wunderlich unit and it went away.  So I’m going to just ignore it.

Green is all std, red is with the Remus system fitted and blue with the Wunderlich unit added and fiddled with a little.  Power first, then torque and air/fuel.

The new style Dobeck units are tuned using the 3 buttons, but the tuning range is somewhat reduced as compared to the old 4 trim pot version.  However, I’m told this is because the base settings in the unit can be preset to not be zero.  This is to allow people to sell the units somewhat preset for the intended application, and you adjust the base settings using a base station of sorts that the unit is placed on to and the desired settings transferred into the unit.  The tuning adjustments work in steps of half one LED, so you can add half, one, one and a half, etc increments as denoted by which LED are flashing, etc.  It’s fairly easy to do if you’ve bothered to read the instructions.

The Wunderlich recommended settings for the Remus full system were green 1, yellow 4 and red 4 with the RPM switch at 6 (6,000 RPM).  Based on the owners comments I reduced the green setting to 0 as he had experienced a reduction in fuel economy.  After the dyno runs I reduced the yellow setting to 3, but kept the red at 4.  The next graph shows the effect of the Wunderlich unit on the mixture.  Green is before Wunderlich fitment (Remus full system only), red is yellow and red at setting 4, blue is yellow and red at setting 2, yellow is yellow at setting 2 and red at setting 4 and pink is yellow at setting 3 and red at setting 4.  The pink line is the final set up, with the yellow setting leaned off 1 increment from the recommended.  Keep in mind there’s a lag of around 500 RPM with the Dynojet air/fuel traces.

Finally, I’ll add the comments from the owner (a fellow named Richard) who is unusually good at giving feedback.  Well, any is unusual.  They’re cut from emails he has sent me over the last few months, and correspond to after exhaust, after Wunderlich and after Wunderlich adjustment.

I thought I would email my thoughts and rider performance of my Remus full system on my bike. I have ridden over 2000km on the bike with the system in the last 5 weeks, including a trip through the snowy mountains. The bike is great fun to ride up through the hills (as is any bike). I rode a similar ride with my standard pipes in January and the bike was noticeably happier to take on the trip revving easier and sounding more impressive going through the cuttings.

*Sound:*
The sound is considerably louder than standard pipes. At first I thought it may be too loud for daily riding, however I am now accustom to the sound and it is not troublesome. The increased noise has not caused me any difficulty with the law (yet?). If I ride sedately I can keep the noise down it is only when I open up the bike that the exhaust system really comes to life.

*Performance:*
The responsiveness from the bike has dramatically improved at low revs and mid range as expected. The bike is far easier to ride at these rev ranges. I have found that the bike is harder to get of the mark. Previously the bike would move off from the lights without a thought I now have to keep in mind that the bike is more sensitive at take off. (Embarrassingly I have to admit I have stalled at the lights taking off twice.)

There is considerably more overrun or “burble” when I shut of the throttle.

*Fuel Economy:*
I am getting about 10Km further out of a tank of petrol. Previously I would get 330km including reserve, now I am getting about 340km. Interestingly I am not noticing much difference from city riding to county riding.

The fuel injection is proving good. It feels as if there is a load more power. My concern is that maybe something has changed in the mapping recently. I say this based on the bike seems to be running richer than when I first picked it up with the fuel mapping.

When I picked up the bike with the fuel mapping, I did not notice any significant change in distance per tank, I may have achieve an extra 20km per tank taking a full tank to empty (as per the trip computer) of 340 to 350km vs 330kms prior to fuel mapping and pipes. Anyway it has now changed to about 300km per tank. The change was in line with the bike feeling like it is running richer. 

The fuel economy is back to standard.  The bike is a joy to ride.  As I commute a lot on the bike it’s a pleasant surprise when I give the bike a kick.  I have not had the chance to fiddle with the settings yet, however I have been out on the open road and give the bike a good run down the great ocean road. 

Prior to the pipes and injection kit I found I could give the bike a kick along and not have to be to concerned that I would be moving faster than expected, now with the modifications I have to be careful about how much throttle I roll on in order to give myself time to brake for a corner.

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