|08-14-2009, 09:22 AM||#12|
Joined: Nov 2006
Location: NE Oregon
Why I Asked...But Each To Their Own
OK...long way around for these points...while researching my R1200S I got heavy into adding an after market exhaust...here is what I found:
#1 Very expensive; very,very expensive
#2 Perhaps a slight 3-4 Hp increase at higher Rpms
#3 The torque curve had a flat spot relative to stock in mid-Rpm range [see above]
So for a sports bike it was a toss up...for a GS or GSA used off road it was not what I personally want...why:
#1 I have all the Hp and torque that I could want or use
#2 The torque I wanted was in mid-range not at higher Rpms
Soooooo....I have found that exhaust systems, ignition mods, fuel control mods are only of benefit if they fit your special needs...discussing them is like discussing which oil is best! Lots of opinions..
If you want to put on a cool looking and sounding exhaust...go for it, it is your bike, do with it what you want to...
Dean's Hp vs weight is a good one; on a race bike this would make sense..... weight is especially of interest for me when that weight is carried up high above CG, where the muffler is mounted.....but I have just shed 27 pounds of weight by going to soft luggage [Ortlieb] and benching my BMW aluminum "adv" boxes..and again I have got way more Hp/torque that I could ever need or learn to use...but reducing weight and especially wt. above the CG will accelerate the development of my riding skills...skilled riders of GSAs can carry a huge load and still make the bike dance under control over tough off road terrain...I can't yet but that is my goal.
If you can overlay the stock vs custom exhausts curves...most manufacturers have this on their web sites, but doing your own dyno test has more validity...check out where and when the advertised advantages occur compare that to where and when you most frequently use the Hp/Tq.
To paraphrase a producer of off road riding skill training DVDs "the best accessory you can add to your bike to improve your skills is gasoline"
Ps...You measure torque and calculate Hp from that @ Rpms...torque rules!
2007 R1200GS Adventure " ...to explore off-road, alone in my case, way out in the boonies...that feeds the soul!" After 2014 BOM my bike is forthwith the "GS McGee"!
Wallowa screwed with this post 08-14-2009 at 09:32 AM
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