Carbon fiber slip-on and dyno tuning
#1
09-17-2006, 12:46 AM
Carbon fiber slip-on and dyno tuning
I just purchased a Two Brothers M2 carbon fiber slip-on, and I'm about to have a Power Commander installed and custom mapped on the dyno at one of their authorized tuners, but I notice that Two Brothers says that you shouldn't dyno tune a bike with a carbon fiber slip-on because it will overheat, and maybe destroy, the carbon fiber slip-ons. While I'm certainly inclined to follow Two Brothers advice, I'm intuitively of the opinion that the bike should be dyno tuned with the exhaust and slip-on on it that I will be using. On the other hand, maybe the slip-on doesn't make that much difference and I should have the shop do it with the stock muffler before the new slip-on is installed. Any thoughts?
#2
09-17-2006, 12:52 AM
Admin Emeritus & MVN
RE: Carbon fiber slip-on and dyno tuning
Put a strong fan blowing on the pipe if you gotta strap it to a dyno. A custom map with the stock exhaust and then swapping to the 2Bros is a waste of time and money. I suggest just loading the 2Bros map for your bike and see how it feels. It should be close but if it needs tweaking they should only have to make 3-4 pulls to get it perfect. You run the danger of cooking the CF when they get happy and make 10+ pulls.
#4
09-17-2006, 05:52 PM
#5
09-21-2006, 12:58 AM
RE: Carbon fiber slip-on and dyno tuning
You would be 100% wrong.
Even a stock bike can use a remapping. I just read an article in one of the mags about the new R6, and how adding a power commander and doing a custom map gave it smoother power, and also increased HP by as much as 8HP at some places in the curve.
Definately worth it, as most bikes run lean to get past more and more strict emissions standards.
To the original poster. if you have an F4i with that pipe, I already have a custom map for that pipe, made on a Factory Pro braking dyno. The map took 3 hours to make, and was done in 250rpm incremements at every throttle position until it was perfect.
The Dynojet tuners that just do a few pulls don't get very accurate gas readings, and they are only tuning for when the throttle is wide open.
My map took forever to make, but it is spot on at every RPM level for every throttle position.
The guy literally started at 2500rpm at 0% throttle, tested for 5 seconds to get a gas reading, adjusted till it was perfect, then went to 2% throttle, same RPM, adjusted, then 5% throttle same RPM, tested, up to 100% throttle.
Then he went to 3000rpm and did the same thing, and so on...
His dyno has a brake that holds the bike at a specified RPM regardless of how much gas you give it, so he can hold it wherever her wants for as long as he needs to get a good gas reading.
Dynojet dynos, you are never at any given RPM for more than a split second, so the gas readings can be way off. They generally just tune for a nice curve, but that never accounts for all the other throttle positions.
Even a stock bike can use a remapping. I just read an article in one of the mags about the new R6, and how adding a power commander and doing a custom map gave it smoother power, and also increased HP by as much as 8HP at some places in the curve.
Definately worth it, as most bikes run lean to get past more and more strict emissions standards.
To the original poster. if you have an F4i with that pipe, I already have a custom map for that pipe, made on a Factory Pro braking dyno. The map took 3 hours to make, and was done in 250rpm incremements at every throttle position until it was perfect.
The Dynojet tuners that just do a few pulls don't get very accurate gas readings, and they are only tuning for when the throttle is wide open.
My map took forever to make, but it is spot on at every RPM level for every throttle position.
The guy literally started at 2500rpm at 0% throttle, tested for 5 seconds to get a gas reading, adjusted till it was perfect, then went to 2% throttle, same RPM, adjusted, then 5% throttle same RPM, tested, up to 100% throttle.
Then he went to 3000rpm and did the same thing, and so on...
His dyno has a brake that holds the bike at a specified RPM regardless of how much gas you give it, so he can hold it wherever her wants for as long as he needs to get a good gas reading.
Dynojet dynos, you are never at any given RPM for more than a split second, so the gas readings can be way off. They generally just tune for a nice curve, but that never accounts for all the other throttle positions.
#6
09-21-2006, 02:12 PM
#8
09-21-2006, 09:53 PM
#9
09-21-2006, 10:22 PM
RE: Carbon fiber slip-on and dyno tuning
Extremely nice of you to provide that. I called my local Power Commander Tuning Center and told them I wanted to come by to make sure they could read the map you sent me before I take the bike in; explained to them that Two Brothers says that you shouldn't dyno tune a carbon fiber muffler; and they tell me that I still have to have the Power Commander mapped on their dyno, and dynoing it is "just like riding it on the street." Really??? Maybe THEY ride differently than I do, or I don't understand how they do THEIR dyno work to custom map a Power Commander, but I'm beginning to have some reservations about these guys, and I'm not very interested in doing what Two Brothers says I shouldn't with a new carbon fiber slip-on. Anyhow, I'll go tomorrow and see if they can read the map you sent. Thanks again.
#10
09-21-2006, 11:03 PM
