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January 20th, 2015, 07:57 AM   #1
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Confirmation of 570 'seat off' trick.

Had a go in the dyno today, wanted to see if there was anything to have with the seat off. I had cut the cooler wings open as much as possible and thought that was enough, but noooo
I did a series of pulls to have the power stabilse and then ripped the seat off while decelling and then did another pull, and it was a great deal better this way. It starts picking up already at 6k and then in an even fashion increases to 7,5-8k where its ~2,7hp better, so this means more power AND lower revs, which is dandy. Fuel requirement followed the gain spot on. Ill modify the seat for sure.
Hat off for the one sharing this in the first place!

(Didnt get the graph with me today, will post it tomorrow.)

Last edited by TomTom; January 20th, 2015 at 08:07 AM.
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January 20th, 2015, 09:08 AM   #2
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No substitute for dyno time when trying to optimize things or find their limits. Good on for you!
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January 20th, 2015, 10:18 AM   #3
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Well, I took a race ready bike and put it on the dyno and the effing lambda bung flew out the second pull on no seat, bugger, or rather panic as Im to practice this weekend, sorted through a welding buddy now, pjew! It could have gone loose on race, so I like to think of its a good thing it came loose now.

A few bits needed to come off to get the mid pipe out, could have been much worse yes, but I searched this forum for help and tatta, there it was.
Tank, rear shock, airboot(mostly because its irritating) and right upper engine mount and it came out. Rear frame and TB still in place.

Last edited by TomTom; January 20th, 2015 at 10:33 AM.
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January 20th, 2015, 11:21 AM   #4
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Nice! Had seen reports both that it worked and it didn't. Thanks for the info!

There's something funny about having 2.7 horses in the seat, haha

very good !
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January 20th, 2015, 11:38 AM   #5
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Whats very clear is how the bike moves when dynoed, more power and rear gets up, and you can feel it fall off.
The first iteration I could feel it fall off, riding it seat off was clear it pulled much better.
More fun and a more wisely proposed curve.

Last edited by TomTom; January 20th, 2015 at 11:51 AM.
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January 20th, 2015, 12:03 PM   #6
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When I got my bike to the dyno I asked them to do a run with the seat off and they said it made no difference...
(also cut the shrouds around the tank )
Maybe it's just because my mapping is not spot on...
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January 20th, 2015, 12:16 PM   #7
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Bull, sorry to hear.
Toss it off in the fly like I did, is that a pain? nope
Go down and pull the seat off the bugger and jump back up on, I did it in eight seconds, including normal decel, without eddy brake.
Less actually and popped the new file, bam, a lot better.

Your service point sucks.

Last edited by TomTom; January 20th, 2015 at 02:21 PM.
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January 20th, 2015, 03:20 PM   #8
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Originally Posted by TomTom View Post
Had a go in the dyno today, wanted to see if there was anything to have with the seat off. I had cut the cooler wings open as much as possible and thought that was enough, but noooo
I did a series of pulls to have the power stabilse and then ripped the seat off while decelling and then did another pull, and it was a great deal better this way. It starts picking up already at 6k and then in an even fashion increases to 7,5-8k where its ~2,7hp better, so this means more power AND lower revs, which is dandy. Fuel requirement followed the gain spot on. Ill modify the seat for sure.
Hat off for the one sharing this in the first place!

(Didnt get the graph with me today, will post it tomorrow.)
I saw 2hp seat off as well, but I have to contend with rocks, mud, water, dust, sticks, occasional trees etc so no free hp for me
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January 20th, 2015, 10:39 PM   #9
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Yep, for trails its no good agreed.
I bet for a reason when I bought the bike I got two seats, so I can have one for ice and one for...not ice

2 some hp doesnt seem like much but with the graph at hand you see what Im mumbling about, the range it affects is interesting to say the least. Reving it to the limiter felt too high I thought and with this mod I find the same power at a lot lower revs, and then some, perfect in my tiny little bubble i like to think of as world
(tuned engine incase someone reads this out of context)

Thanks from bushmechanic and Snecx

Last edited by TomTom; January 21st, 2015 at 01:09 AM.
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January 21st, 2015, 11:24 AM   #10
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Today I gutted the seat.
Bike is still in the dyno so its just a matter of putting things back and have another go, Ill see if no seat is the same result as opened up seat, that I dont know just yet

Just dont bet on that the oem lambda probe mount is very stable, it cracked, glad it did that now and not while on a distant track meet.
OEM point will be patched, bye bye.
Good bit of fun digging that mid pipe out, dont worry its sorted now. Friday it will be back to try the hacked seat versus no seat.

Thanks from bushmechanic

Last edited by TomTom; January 21st, 2015 at 03:14 PM.
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