SR-Racing Exhaust

[FIN_GSer]

I just installed German RS-Racing exhaust, full system to my R1200GS.
I dynoed it to get better understanding what is the situation with standard pipe in comparison to after market one.
We did three options:
1. Original STD pipe
2. SP-racing full system (headers, Y-piece, connector, muffler)
2. RS-racing full system withour DB killer.

If someone can host images of dyno charts, I can share them with you.

Comments:
There is no point revving GS over 6000 rpm, Torque drops steeply and overall power output remains quite even after 6000rpm.
SR-Racing pipe gives SIGNIFICANT improvement between 4000-6000 rpm, with or without db killer. There is 4-6 Nm increase over the rev range 4-6k.
With DB killer, torque is very same with STD pipe around 2-4k, with out DB killer there is ~2Nm improvement. However DB killer makes a dip around 4,8-5k in comparison to "with DB killer".
STD pipe drops torque quite steeply after 5,6k, SR-racing pipe extends max torq to 5,5 - 6,2k rpm, and it stays about 2 Nm higher untill rev limiter kicks in.

Sound with DB killer is very comparable to STD pipe, without DB killer it is a lot louder, but not even close to "HD-lover's" spec.

Max output from rear wheel
STD: 88.53 HP at 7600rpm
SR_rac: 89.20 HP at 7500rpm
No DB: 90.33 HP at 6900rpm

Max Torq from rear wheel
STD: 101.14Nm at 5700rpm (over 100Nm 5600-5900)
SR_rac: 102.24 at 5900rpm (over 100Nm 5600-6200)
No DB: 102.46 at 5900rpm (over 100Nm 5500-6300)

All runs were done at the same day, STD pipe in the morning and SR-racing pipe in the evening.

I will stay with SR-racing pipe without DB killer for now

BR

FIN_GSer

 

[jeff garnett]

dyno charts

HI
Email me on Jeff0[!at]breathe.com (replace the [!at] with a @ )
will post the dyno charts

jeff

 

[plasmatron]

Thanks for sharing your test results FIN_GSer...

I'd be very interested to see the dyno graphs since it's great to have actual dyno evidence of what a can / system does to the bike instead of "yeah it feels a little better, smoother" seat of the pants analysis or the manufacturer's "optimistic" dyno figures...

looking at the figures you posted the difference seems marked, but fairly small, max increase of less than 2HP and less than 2Nm... and based on the German forum's review, the SR-Racing can is the best of the bunch performance wise... looks like the weight savings is perhaps the biggest advantage... I guess BMW did a good job making the stock can as efficient as possible, just a pity it's so quiet...

 

[Deleted account 211025001]

Thanks for the post Fin_GSr. I'll look forward to seeing the charts at some stage.

Whilst running the dyno did you look at the fuelling and how rich / weak the mixture was with and without the pipe?

Cheers
Andres

 

[jeff garnett]

HI
Email me on Jeff0[!at]breathe.com (replace the [!at] with a @ )
will post the dyno charts

jeff

Hi
not had a email
jeff

 

[jeff garnett]

Here is my dyno chart finally. I was away from net for a while..

I got printed charts and exported data from the company who did the dyno (KX-Center in Tampere Finland). The printed charts I did not scan but I imported the data on to excell and made the charts.
I attached both screen grap image of the results and the excell file containing the data. Feel free to use the information as you like but please include my name as source for it.

Only relationship I have to SR-racing is clear customer one, so this is not payed ad... ;-)

BR

Risto Pirhonen


dyno charts by FIN GSer

 

[jeff garnett]

Hi

If anyone would like a better quality jpeg email or PM me

all numbers for HP & Torque in Excel

jeff

 

[TheJoker]

That's quite a difference!

Thanks for that guys!

 

[FIN_GSer]

About fuel/air ratio.
We did not stick probe into STD pipe as we expected results to be unreliable due to unknown internal structure of the can.
With SR-racing pipe we did use probe. Unfortunately results we´re not exported. (I will go and ask for it)
Bike runs quite lean, but not anything dramatic, was dyno guy's comment. If we had had Powercommander, he would have given it a bit more juice on low and high revs. Especially high revs.

FIN_GSer

 

[Deleted account 211025001]

That looks very worthwhile - especially the gains in and smoothing of the torque curve.

Cheers

Andres

 

[Franky]

How much did the exhaust cost? Where can you get them from?
:monasmile

 

[FIN_GSer]

I ordered the exhaust directly from source: SR-Racing
They understand written English and reply in German

It costed ~1080€ shipped (UPS) to Finland.
They wanted it to be prepayed for overseas delivery. They sent me bill, I payed it in my bank, the pakage arrived within 2 weeks.

Not cheap, not too expensive (especially compared to Akrapovic)..

FIN_GSer

 

[geojunkie]

How did the install and fit up go....

FIN_GSer, can you comment on how well the installation and fit up went. Wondering about the quality of the kit and also you thought as to ruggedness of the setup over rough terrain.

Thanks,
Dan

 

[FIN_GSer]

The quality of the pipe is good.
All parts fit wery well, there were no problems installing it. All joints are tight and easy to install. (I did it by myself) Headers are connected to Y-piece by sleeve joint with spring, S-pipe is connected by clamp to Y-piece, end muffler is connected to S-piece by springs.
There is separate gaskets between headers and head.
Oxygen sensor mounts are welded to headers. They are a bit further from head when compared to original ones. I have Touratech crash bars and Oxygen sensors are OK with them.
Center stand holder is assembled to brake pedal screw. (Instead of S-pipe as in original) The aluminium piece needed a little file job before it fitted 100%. I could have left it as it was, but I wanted to make it perfect.
All welds are OK, not suberb like Akra, but very acceptable. Those more visible are better looking than those more hidden. (reasonable) End muffler is faultless, as it should.
They supply type approval certificate with the delivery. If DB killer is removed it propably gets too loud tor TA. DB killer is fixed to muffler by screw. The screw is welded to muffler. It can be opened after minimal file job

I am happy with quality/price balance!

FIN_GSer

 

[FIN_GSer]

There is a typical debate ongoing in US:Advrider

FIN_GSer