Hayabusa problems

Kevin Gleeson said....

KG> I'm prepared to go down the Power Commander road, but only if I can be
KG> sure it'll fix the problem. The mechanic said he'll fit and dyno the
KG> PC for free for me (because he was sure the remapping would work and
KG> it didn't, so he said he'd get it working) but it's still an outlay of
KG> $700-$800

Does he sell the power commander? If so, ask him to fit it and if it
works, you'll buy it. If it doesn't, you won't.

Sounds like that there are some consumer issues here that may be best
looked at away from this forum.

 

Isn't the idea of the EFI and computerised engine management systems

most efi's are carefully programmed to achieve several goals, noise,
emissions, smooth operation etc...not performance...and when u change stuff,
unless it is a true closed loop system with a properly programmed
unrestricted computer ( wolf, motec) it wont adapt...even factory stuff with
gas sensors only works within its programming...which can be middlin to fair
at the best of times from the point of view of operating the engine
properly, not keeping it quiet and other stuff...

 

Well that was my thought as well ...

I've changed pipes on bikes before, these are just cans, I found it
hard to believe that this big a problem would occur .... but it
appears that is the case.

Cheers


Kevin Gleeson
Imagine It
West Hobart
Tasmania Australia
www.imagine-it.com.au

 

He'll need to get hold of one, he doesn't normally use them.

Cheers



-------------
Kevin Gleeson
Technical Director
Blue Rocket Productions
Hobart, Tasmania, Australia
www.blue-rocket.com.au

 

Closed loop is fitted as standard to most cars, the only bike I've heard
specified as having an o2 sensor which allowed closed loop was the beemer k12 -
don't even know if it's true.

It's not a difficult technology to fit standard so i''m stuffed if i know why
they don't

JL

 

Or don't the modern bikes with EFI have this capability?

the Buells have a hybrid closed loop where the idle is programmed way too
rich...so it will idle as smooth as it can...then it goes to o2 sensing at
1500? rpm...but if you fit the race kit pipes and filter you need to fit the
race computer as well to realise the potential of the mods
even in cars the feedback from the loop is only used within given
parameters...if you change too much from factory settings it wont keep
up...thus the proliferation of 'performance' chips, piggy back devices and
outright replacement computers...these things, along with reprogramming
factory boxes, if you can, have been standard in car circles for years
now...you give it a pipe and a filter and have the efi dyno tuned...then if
you get serious you get a motec box to go with your mods (compression, cam,
porting).
the power commander is an example of the 'piggy back' device, which modifies
the inputs to the factory computer to trick it into behaving
differently...by telling it that the airflow is less or the throttle is open
more or the temperature is higher and such the factory fuel map is
'overridden'.

 

That's the same for most cars - it's usually open loop at idle.

JL