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Hypermotard Full VS Slip-on Exhaust
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Hypermotard Full VS Slip-on Exhaust - September 18, 2007, 10:35 AM

(from a post found on supermotojunkies.com)

Interesting information I found on another forum. I figure it may be of interest for those who are not sure which way to go.

http://thehouseofmetal.net/DynoChart...on.vs.full.bmp

Our Dyno is known to read about -5RWHP than other local dyno shops, but anyways..................

.005 Dyno run is a HM1100 with a full Termignoni exhaust system, DP ECU, DP intake w/ stock air filter and dyno tuning.

.018 Dyno run is a HM1100 with A&S valves adjusted to .10mm, Termignoni slip-on exhaust, DP ECU, DP intake w/ BMC air filter, cams degreed and dyno tuning.

A stock 1100 engine makes around 80RWHP. The gains from the .018 Dyno run are not only due to the performance parts, but the valve clearances/cam timing being correctly set up. If I were planning on purchasing an exhaust, I would go with the full Termignoni exhaust system and BMC air filter. You should expect more horsepower with the valves/cam timing properly adjusted (+3-5RWHP).

As always, all of this does not matter if it is not properly set up to begin with.


Chris
2008 MARRC AM Racer of the Year

Last edited by deviousR6; September 18, 2007 at 12:14 PM..
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September 18, 2007, 01:37 PM

cool, you can bolt on parts to turds.. saweet!


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September 18, 2007, 01:50 PM

Quote:
Originally Posted by spud
cool, you can bolt on parts to turds.. saweet!
Yup...and I can ride anywhere too


Chris
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September 18, 2007, 02:45 PM

not really that suprising, the larger primary would likely improve scavenging and flow at higher revs, but at the highest revs, the heads are likely the biggest restriction so the larger exhaust doesn't buy you much--that and the flow rate is higher, with pulses closer together so proper pulse timing and expansion in the initial parts of the exhaust system are not nearly as important


Marc
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September 18, 2007, 03:14 PM

so um...what you're saying is....


Chris
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September 18, 2007, 03:15 PM

I follow John Hopkin's theory of riding...the more you know the slower you go


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September 18, 2007, 03:17 PM

in my case, its very true


Marc
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September 18, 2007, 03:20 PM

Actually, what you're saying makes sense although, I don't really know enough about motors in general to understand exactly how that all plays in o a V-twin motor.

Larger exhaust helps but it only does so much...

Guess you really need a combination of exhaust and ECU tuning to dial in a good fuel curve. Until I turn expert I'll just stick with my slip-on and stock ECU settings on the race bike. The Hyper comes with an ecu tuned specifically for the race exhaust, air box, and air filter so they did a good job. The bike is very different than stock with this system on...no complaints at all as far as that is concerned.


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