Remus Exhaust System Upgrade

[Switz]

I thought I might gain some power, have a cooler transmission and left saddle bag, a better exhaust sound, and save some weight on my 2007 R1200RT. We replaced everything from the cylinders rearward with Remus parts.

 

The headers came in two pieces and reached from the cylinders back to just past the transmission. With no cat converter, the heater for the transmission became history. The intermediate piece then continued to the left to the carbon fiber exhaust can. That can is cool to the touch even right after a dyno run, so the left bag and it's contents are not getting cooked while on the road. The total weight savings were about 7.5 pounds.

 

The Remus carbon fiber can can be looked through like a telescope, so there appears to be not a lot of back pressure generating stuff in it.

 

However, the engine crash bars from Wunderlich #8160735 would NOT fit around the new exhaust headers.

 

There were no other modifications to the stock engine including the air filter. So you ask, what was the gain at the rear wheel on the Dyno? We got about a 5% gain in horsepower ( from 102.16 to 107.25 HP) and about a 4.7% gain in torque (from 78.73 to 82.46 ft pounds).

 

What did this exercise cost? The list prices on the three Remus parts totaled $1,234 plus tax and shipping. A couple of new exhaust gaskets at $9 each and we add in labor and two dyno runs for a discounted total of about $1,650.

 

The bike exhaust sounds more throaty and the bike feels quicker with better engine response.

 

If your are interested, here is the link to the pdf file of the dyno printout:

 

http://www.azbiker.us/Motorcycle/BMW/R1200RT/Dyno_Results_Exhaust_Upgrade.pdf

[Dave_zoom_zoom]

Thanks for all that great info. Switz!

 

I'd sure be interested in your subjective impressions re:how it feels & sounds to you.

 

Any chance of some photos if it's not to much trouble?

 

Looks like a worthwhile up grade. (it's only $$$$$$$)

 

Thanks again!

Dave

[lopaca]

Thank you for this thread as I have been sitting on the fence on this upgrade ever since I got my RT.

 

Based on your review I am going to go for it.

 

My biggest concern was the difference in tone because when I do ride it is usually all day and multiple day rides. I was worried that the different tone would be hard to listen to for any extended period of time.

 

Thanks again.

[panman]

I purchased the complete system for around $900. They were on sale at SJBMW. The fuel management system does not adequetly provide enough mix. When I installed it last year, powercommander did`nt offer anything for the RT yet. I also found the sound annoying.I have other loud bikes to ride. I haven`t dyno`d it , this is just my seat of the pants reading. I regularly wring it out on rides with my sport bike friends. I thought it ran better with the stock exhaust, so I am now running the remus header with the stock muffler.It seems to run perfectly , has a pleasant, slightly deeper sound, and still gets excellent fuel mileage

[Switz]

Will post photos soon.

[Buckster]

Panman, what information do you have that the mixture is too lean when a Remus is installed?

Thanks Buckster

[panman]

I don`t have any hard data , just 35 years of tuning bikes by ear, crack the throttle wide open and you get air, a dead spot, unresponsiveness, followed by lots of popping on decell. I was told the fuel management would compensate somewhat , it`s still rideable, not to lean to damage engine. But , for optimum performance, the fuel mix must be increased, which I really don`t wanna do. I`m getting 50 mpg with this thing

02` buell x-1

custom buell drag bike

07 bmw rt1200

65 hd panhead

2000 triumph trophy

yamaha fjr1300 -sold for bmw

[R4ND0M_AX3]

It would most likely only need to be increased during heavy load. Your closed loop cruise MPG shoudn't be affected.

[Switz]

Here is an update to the original thread. There is a very low freguency exhaust tone that is different to the OEM sound. You do hear it all the time and it is much more pronounced under accelleration. When quickly letting off the throttle, there tends to be some popping in the exhaust. The engine feels "quicker" when rolling on and off the power.

 

Some relevant links:

 

If your are interested, here is the link to the pdf file of the dyno printout:

 

http://www.azbiker.us/Motorcycle/BMW/R1200RT/Dyno_Results_Exhaust_Upgrade.pdf

 

Here is a photo of the left front. Note NO crossover between the headers. The original crash bar bracket is still fastened to the engine, but that system is unusable because the new pipes are slightly larger in diameter and are bent differently than the OEM header with the Catalytic converter.

 

http://www.azbiker.us/Motorcycle/BMW/R1200RT/Remus_Exhaust/Front_Left.jpg

 

Here is the right front view.

 

http://www.azbiker.us/Motorcycle/BMW/R1200RT/Remus_Exhaust/Front_Right.jpg

 

Here is the left rear showing the can and middle connector.

 

http://www.azbiker.us/Motorcycle/BMW/R1200RT/Remus_Exhaust/Rear_left.jpg

 

Here is the center section going into the front header. Note the free airspace above the exhaust system that used to filled with the Catalytic converter and heated up the transmission gears and oil.

 

http://www.azbiker.us/Motorcycle/BMW/R1200RT/Remus_Exhaust/Center_Section.jpg

 

Here is a close up of the center hanger bracket area.

 

http://www.azbiker.us/Motorcycle/BMW/R1200RT/Remus_Exhaust/Closeup_Center_Hanger.jpg

 

Here is the detail of the two into one connection of the header pipe.

 

http://www.azbiker.us/Motorcycle/BMW/R1200RT/Remus_Exhaust/Two_to_One_Pipe_and_Hanger_Detail.jpg

[gregpopovich]

Last week I installed a Remus Revolution Ti slip-on --without the headers & it seems to work very well taking into consideration I've only put about 40 miles on my bike since installing it (2006 RT). I have the baffle in & it's as quite as the stock at idle & a slight bit louder when gunning it. IMHO, it sounds much sportier & it sure looks a lot better then the giant original can--it also shaves a few pounds of weight which never hurts. I dealt with this company (link below) Maxmoto & they were great!

 

 

Click here: www.maxmoto.com

[vfrman]

Great looking finish on the headers.

The welds are horrible... good thing they're under the bike and out of sight.

[QuienSabe]

Since your Wunderlich #8160735 crash bars no longer fit, will you be selling them?