Question on fuel injected bikes

[Jackal]

Do they need to be tuned for elevation like carbs need to be rejetted, or is the altitude here within their "range"/compensating abilites?

Reason I ask is because I just bought a busa a week ago, not that it feels like its short on power - my god - but I don't want to be shorted :D

Note that it is used, but I bought it from the dealership the orginal owner bought it from and the guy left it completly stock.

[~Barn~]

F.I. bikes will adjust themselves based on the fuel management software and hardware. As it becomes acclimated to the elevation, oxygen content, barometric pressure, and probably a few other things, the computer on the bike will adjust the air/fuel mixture for the best performance.

Now keep in mind that "best performance" is defined in this case, by the manufacturer. It is typically fuel economy driven, and not truly a performance benchmark. Regardless, it will be doing what the ECU has computed as "ideal", and you should be satisfied by the power output.

Products such as a Power Commander, allow you to tweak all that crap, and adjust air/fuel and timing and other ECU related functions. With that, you can tune the final few HP out of your machine, tune it for even better fuel economy, and adjust for aftermarket parts that affect air flow. Filters, pipes, velocity stacks, etc..

Hope that helps.

[Jackal]

Thanks. Reading reviews of this bike people were loosing their minds with stories of mad wheelspin in 1st and power-up wheelies in 2nd. Stupid altitude :x But even so the power output is highly grin inducing :D

[W1LL]

ok this might sound real stupid but for F.I. bikes when you add bolt ons and such does the internal computer or whatever adjust or do i need to take it to the shop or is like a car and you need to disconect the battery for a few and then reconect so the computer sets to the new settings like when you add an aftermarket intake to a car? or am i just rambling on to get some more posts due to me being on percocet? :roll:

[GOTTI]

I made a low dollar adjustment..for Suzuki's as far as I can tell. Called a Timing Retard Eliminator (T.R.E). The way your bike is mapped from the factory, the man. is trying to lower chance of looping and such in gears 1-4, by retarding timing. Weird thing is, once you hit 10k rpm, the bike wants to come alive, all of a sudden. Check gixxer.com (store section), and for $30 you can have a 5 minute plug-on, that will trick your bike into thinking its already in 5th gear. The timing retard is gone, and usually the power spike at 10k..no power loss, but it feels faster off the bottom, and smoother at upper rpms...more drivable. Then, if ya want more, look at PC III's, etc. Think you'll like it.

[Lomax]

ok this might sound real stupid but for F.I. bikes when you add bolt ons and such does the internal computer or whatever adjust or do i need to take it to the shop or is like a car and you need to disconect the battery for a few and then reconect so the computer sets to the new settings like when you add an aftermarket intake to a car? or am i just rambling on to get some more posts due to me being on percocet? :roll:

This depends on the type of system and the software. On most systems the map that in the confuser will adjust the mixture within "A RANGE". This means that it will try to keep the fuel mixture within a rich/lean condition as per the map. If you add pipes, intake, yadayadayada you may exceed the range of the existing map. This would require a re-map to extend the range so that the computer will get it right. All this can be done with a re-map or a PC-III or one of the other mapping override boxes. The only way to be absolutely sure is to put it on a dyno and get it right the first time. You will get the best performance and not cause any inadvertent engine damage this way.

Cheers.
Marc

[copkod78]

has anyone ever used one of ivans tre's? what makes them so special to be sold at $100 as compared to the normal 30 bucks?

[DucWise]

has anyone ever used one of ivans tre's? what makes them so special to be sold at $100 as compared to the normal 30 bucks?

They are special because they are plug and play. I made a simple TRE for my TL for about $1 :p (parts from RadioHut) Although for about $5 more you can make a slightly smarter/better one ;) If you want one that just plugs into your exisitng harness then you get to spend a LOT more (i.e. Ivan's)

And on altitude... I think the general (overly general??) rule of thumb is that you lose about 3% HP for every 1,000 ft in elevation. FWIW.

[UglyDogRacing]

has anyone ever used one of ivans tre's? what makes them so special to be sold at $100 as compared to the normal 30 bucks?


these are cheaper and do the same thing- http://www.jsdproducts.com/

[Matrix]

these are cheaper and do the same thing- http://www.jsdproducts.com/

Does a PCIII already do the timing mod or do you use this in conjuction with a fuel management system?

[UglyDogRacing]

Does a PCIII already do the timing mod or do you use this in conjuction with a fuel management system?


read my reply in this thread- http://www.cosportbikeclub.org/forums/showthread.php?t=22826

[06sv1000s]

Don't think the PCIII does the timing retard function it just maps fuel/air according to what you have done to the bike.

To add to the altitude/ECU thing............
Adding a K&N filter and not remapping (or pciii) is different than K&N, pipes, any airbox mods, TRE, etc... A good rule is if you add k&n, pipes and lose the lid or snorkel on the airbox it's best to get it remapped, dynoed or pciii'd to fine tune the air/fuel ratio to get the most out of your performance accessories.

Hope this helps! There are other fuel management systems out there but the pciii is about the most advanced as far as adjustment at shorter intervals in the rpm range! You can get into other systems but they are rare and quite pricey. Good luck