Fran, thanks a lot. Much easier job than being a godfather ;)

Akra tested!
 

Today the Akra m-h6/3 was fitted and mapped/tested at dynocenter.
Two mappings created; 1 with closed lid (for enduro use), one with stage2 filter side cover.
Good results!

Explanation on the dyno results:

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runfile_001 20-3-2009 19:49

2-in1/ Trinity Raptor 700 headers with custom collector/link pipe (with sensor plug)
Micron silencer oval (2,76kg) with dbkiller inserted
P&P head
modded cam
103mm bigbore with Nicasil
CR 11,3:1
JE piston
+2mm TB
PCIII
K&N stage1& DNA stage2 filters

62,96HP/72,09Nm
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runfile_0012 - 21-3-2009 3:41

2in2/ OTR headers (with custom sensor plug)
BSM linkpipe+silencers with dbkiller inserted
P&P head
modded cam
103mm bigbore with Nicasil
CR 11,3:1
JE piston
+2mm TB
PCIII
K&N stage1& DNA stage2 filters


66,71HP/77,52Nm
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runfile_001 29-5-2009 19:09

2-in1/ Trinity Raptor 700 headers with custom collector/link pipe (with sensor plug)
Akrapovic silencer type m-h6/3 (1,58kg) with dbkiller inserted
P&P head
modded cam
103mm bigbore with Nicasil
CR 11,3:1
JE piston
+2mm TB
PCIII
DNA stage1&2 filters

68,07HP/76,39Nm

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runfile_003 29-5-2009 19:59

2-in1/ Trinity Raptor 700 headers with custom collector/link pipe (with sensor plug)
Akrapovic silencer type m-h6/3 (1,58kg) with dbkiller inserted
P&P head
modded cam
103mm bigbore with Nicasil
CR 11,3:1
JE piston
+2mm TB
PCIII
DNA stage1 filter / genuine side cover installed/closed airbox lid (Enduro setup)

65,59HP/74,01Nm

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all test snorkel removed!
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Weight reduction

The complete BSM exhaust system (otr headers/bsm linkpipe+silencer x2) weights exactly 2x5Kg=10Kg

Akra silencer: 1,58kg
Clamps: 0,02Kg x 2 = 0,04Kg=40gram

Micron silencer: 2,76kg
clamps: 135gr x2 = 270gram

reduction using Akra instead of Micron: about 1,4Kg
reduction using Akra instead of BSM: about 6Kg

Conclusion:
The Akra performs undoubted better than the Micron silencer at higher revs.

The BSM still gives you the best overall performance, but weights over 6 Kgs more.

I would like to test the OTR headers+BSM linkpipe with 2 Akra m-h6/3 and see the results. Maybe later, Akra costs lots of money!

The dna stage 2 side cover filter produces about 2,5Hp gain and more torque too. That's great BUT it's for RACE ONLY. So offroad use the closed lid.

I'm very statisfied with the results. I got back the lost HP and torque caused by the Micron silencer; Got even more HP than the 2in2 system ;)
The only thing is you have to rev the bike more.

http://www.youtube.com/watch?v=o7dmxHpQ0gA

Marcel you are getting as bad as used to be when I got my first XT on the dyno, I could not stop putting my bike on there to see the results. Nice work mate.

As I have mentioned before having the biggest HP does not mean it is the best over all result over the whole rev range. I will explain what I look at when I read a dyno run. Comparing 2 runs results RED 68.07 & Green 66.71HP, very close in HP at the end result but very different across the whole rev range.

(Point 1) As you can see from the over lieing dyno results, having 68.07 HP at 7000rpm is great, (point 2) but it comes with big torque & HP loss below 5750rpm.

(point 3) Far better result is the 66.71HP run which produces the biggest torque to 6300rpm, (point 4) & produces the most HP & torque across the whole range to 6500RPM.

This is the set up that would use.

runfile_0012 - 21-3-2009 3:41

2in2/ OTR headers (with custom sensor plug)
BSM linkpipe+silencers with dbkiller inserted
P&P head
modded cam
103mm bigbore with Nicasil
CR 11,3:1
JE piston
+2mm TB
PCIII
K&N stage1& DNA stage2 filters

66,71HP/77,52Nm

I would have liked to see the 2in2/ OTR headers tested with the other cans as this header seems to stand out in my eyes on the dyno sheet.

http://i201.photobucket.com/albums/a...pycopycopy.jpg

thanks Kev,

I indeed do agree this is the best setup:

2in2/ OTR headers (with custom sensor plug)
BSM linkpipe+silencers with dbkiller inserted
P&P head
modded cam
103mm bigbore with Nicasil
CR 11,3:1
JE piston
+2mm TB
PCIII
K&N stage1& DNA stage2 filters

66,71HP/77,52Nm

I would like also to see the results with the Akra cans on the OTR/bsm headers/linkpipes. I would have to order another Akra for that. Have to save some money first for this mod ;)

Are those 2-2 headers available elsewhere other than through OTR?

I have been wanting to order these for a while now but I am a bit worried about using OTR as they seem to have bad reputation.

Looking at the good torque figures on Marcels tuned bike I am hoping I would get some good gains from these on my LeoVince + DNA 1/2 + PC3 combo. I guess the headers would do even better once I get the big bore, cam and head done.

+ 1mm inlet valves & you will be over 70HP.

As far as I know OTR is the only supplier who's making +4mm oversized headers. I also experienced some troubles with OTR but what other options do we have?