Aftermarket 919 exhaust - when to change? - Wrist Twisters
 
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post #1 of 21 Old 09-02-2007, 02:10 PM Thread Starter
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Question Aftermarket 919 exhaust - when to change?

I did a search but did not find anything. Can anyone give me some advice on when is a good time to change the exhaust on an '07 919?
This fuel injection stuff is new to me and I want to break the bike in properly but I also know I want to change the mufflers. I already have a set of Jardine cans that I got a great deal on but I am not sure how the bike "learns". If I should put them on right away so it adjusts to them or let the bike break in under stock conditions then change them?
Anyone got opinions? Thanks!

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post #2 of 21 Old 09-02-2007, 03:03 PM
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If I am correct, any time is a good time to throw on your slip-ons. The 919's FI is not that intelligent. It bases most of it's logic on throttle position and engine temp. It requires a piggy back program (power commander) to make any major changes to the stock fuel air map.

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post #3 of 21 Old 09-02-2007, 04:25 PM
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Yeah, throw them on yesterday. Break it in as recommended.

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post #4 of 21 Old 09-03-2007, 04:42 AM
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yea that is what i did, i have 0.0 miles on stock cans. about 10mins total run time with them. 6000 miles on bike. first thing that went.

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post #5 of 21 Old 09-03-2007, 05:25 AM Thread Starter
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Thanks guys. sounds like I've got something to do on my day off!

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post #6 of 21 Old 09-03-2007, 06:15 AM
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Do a search for it on the site here you find a ton of stuff on aftermarket slipons for the 9er, I have the Satos CF ,no complaints. Good luck on your search, str8

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post #7 of 21 Old 09-03-2007, 12:33 PM
 
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Quote:
Can anyone give me some advice on when is a good time to change the exhaust on an '07 919?
Not immediately after a long run! OUCH MY FINGERS

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post #8 of 21 Old 09-03-2007, 04:54 PM
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Just wondering the performance benefits the slip ons have over the stockers?
A lot of dough to throw at the bike to make it sound different if thats all they do............

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post #9 of 21 Old 09-03-2007, 06:20 PM
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Quote:
Originally Posted by garyb900 View Post
I did a search but did not find anything. Can anyone give me some advice on when is a good time to change the exhaust on an '07 919?
This fuel injection stuff is new to me and I want to break the bike in properly but I also know I want to change the mufflers. I already have a set of Jardine cans that I got a great deal on but I am not sure how the bike "learns". If I should put them on right away so it adjusts to them or let the bike break in under stock conditions then change them?
Anyone got opinions? Thanks!
If you have more than 20 miles on the bike, it's broke in! Rings seat fast... you have maybe 20 miles at longest to do this and correctly. After that, the 600 miles that the OEM recommends is more of a shake down period. They want you going slow in case anything is loose and falls off If you have any mechanical aptitude, and you are sure it's tight and performing relatively solid, you are done after 20 miles. Note, you really should change the oil after the first 20 miles. I always do it again at the 500 - 600 mile mark as recommended by the OEM so they can't say I didn't do it and deny my warranty. You guys that pansy around the throttle for the first 20 miles are not doing your motor any good. And doing for 600 miles is a waste of time. 20 miles maybe, rings seat, that's it! The idea is to load them under acceleration and deceleration to achieve the tightest seal in the cylinder bore as possible before the cross hatchings have worn off and no further seating will occur. I am not saying flog on the motor. But you need to get a good load on it and build up pressures and forces in both directions.

Ok, here come the flames.

garyb900,

BTW, your FI uses mapping and does not learn like in modern cars. The FI continues to use the same mapping regardless of exhaust changes, thats why there is the Power Commander, to change the map to accommodate your intake & exhaust modifications.

- Rev. CYCHO -

tires.... it's what's for dinner!
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post #10 of 21 Old 09-04-2007, 04:37 AM Thread Starter
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Thanks again.
MotoCycho,
Good information. I will change the oil as I now have 175 miles on it and then let the dealer do their 600 mile change as well.
I put the Jardine cans on last night and I really like them. The bike is still pretty quiet at idle so I won't wake the neighbors when I leave for work but it has a very nice sound under accelleration and it may be the butt dyno but it feels a little peppier too.

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post #11 of 21 Old 09-04-2007, 04:55 PM
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Just wondering the performance benefits the slip ons have over the stockers?
? ? ?

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post #12 of 21 Old 09-05-2007, 11:59 AM
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Any aftermarket exhaust will add some degree of performance to the 919.

It might be some more top end power at the expense of lower performance in the low and/or midrange or it might be an overall performance increase throughout the entire rev range etc...

A properly designed exhaust will accentuate the motors inherent design & give proper gains throughout and some exhausts are so well designed & tuned to the engine that they deliver performance gains in areas of the rev range that normally are flat or dips in the power curve.

There is an entire science of exhaust dynamics that come into play, but most brands don't even try to do any R&D work they just bend some tubing to make it fit the bike & then throw an off the shelf cannister on it & ask for your credit card. Other manufactuers actually put the time into it to make an exhaust that actually performs well, has premium build quality & they back it up with customer service too.

I have written an exhaust article for the 919 & there is an even way more indepth article of exhaust system in the first paragraph of this article if you really want to know the ins & outs of it

http://www.919.org/exhaust.htm

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post #13 of 21 Old 09-05-2007, 01:44 PM
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Quote:
Originally Posted by 97af View Post
Just wondering the performance benefits the slip ons have over the stockers?
A lot of dough to throw at the bike to make it sound different if thats all they do............
I've seen dyno sheets on the web where adding slip ons and a pc3 increased hp by 3-7.

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post #14 of 21 Old 09-05-2007, 05:54 PM Thread Starter
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Quote:
Originally Posted by Lord Duckhunter View Post
Any aftermarket exhaust will add some degree of performance to the 919.

It might be some more top end power at the expense of lower performance in the low and/or midrange or it might be an overall performance increase throughout the entire rev range etc...

A properly designed exhaust will accentuate the motors inherent design & give proper gains throughout and some exhausts are so well designed & tuned to the engine that they deliver performance gains in areas of the rev range that normally are flat or dips in the power curve.

There is an entire science of exhaust dynamics that come into play, but most brands don't even try to do any R&D work they just bend some tubing to make it fit the bike & then throw an off the shelf cannister on it & ask for your credit card. Other manufactuers actually put the time into it to make an exhaust that actually performs well, has premium build quality & they back it up with customer service too.

I have written an exhaust article for the 919 & there is an even way more indepth article of exhaust system in the first paragraph of this article if you really want to know the ins & outs of it

http://www.919.org/exhaust.htm
You have an excellent site with LOTS of great information and pics. I actually found your site first and that led me here.

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post #15 of 21 Old 05-13-2008, 07:19 PM
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I require pictures of the Jardine cans please.

It's hard to be humble at 9 G's.
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post #16 of 21 Old 05-13-2008, 07:33 PM Thread Starter
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Here ya go!
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post #17 of 21 Old 05-13-2008, 08:07 PM
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Looks pretty damn good man!

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post #18 of 21 Old 05-14-2008, 05:51 AM
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Looks great Gary!

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post #19 of 21 Old 05-14-2008, 07:21 AM
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nice

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post #20 of 21 Old 05-14-2008, 04:39 PM
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Here ya go!
nice looking bike. One question: Where does the passenger put their feet?!!!

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post #21 of 21 Old 05-15-2008, 04:14 AM Thread Starter
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nice looking bike. One question: Where does the passenger put their feet?!!!
I don't ride passengers. They add weight, LOL!

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