New R1 uses M1 firing intervals.

[Busy Little Shop]

Originally Posted by Old Baldy

Felt.....yup. Like I said previously, it surely will feel different.

I really think you'll be pleasantly surprised at the degree of difference the crank phasing makes in an I4...

[Old Baldy]

Originally Posted by Busy Little Shop

I really think you'll be pleasantly surprised at the degree of difference the crank phasing makes in an I4...

And I'd be very happy to see that difference. Unfortunately, it's never going to be possible to test the crank differences, without the simultaneous other tuning improvements that are made at the same time, with each new model series. Yamaha has needed to work on their low and mid-range power for some years now, to be competitive against the other top bikes. I'm sure they will have improved their powerband with the latest tuning changes.

[mikstr]

I can't help but wonder when was the last time Larry rode an I4 to keep going on and on about the "cammy hit". Having had the opportunity to ride numerous bikes in the past year, the ones that amaze me the most with their powerband width are precisely the new I4's. Ride a Bandit 1250 or a CBF1000 (not available in the US) and report back to me, times have definitely changed from the old peaky and tempermental oil-cooled GSX-R750. Not that we'll get ever get a certain forum member to admit that, however..... "V-4... blah blah blah....... V-4 yaddah, yaddah, yaddah....."

Please Larry, post the dyno sheet for "Mr RC45" again so we can play "spot the torque dip(s)", it is soooooooo much fun

[johnyisthedevil]

I would also like to pose the question; when and what was the last ponderous crank v twin that has graced his ass with it's presence. cause modern supersport twins like the recent ducati liniage, or aprillia , or even an rc51 realy handle well ,and the gyroscopic effect of the crank is realy minimal. now a buell on the other hand i can understand. I have to admit that a v-4 is my favorite engine architecture but I prefer the screamer cranks. to bad they are crap though, eh Larry?

[Busy Little Shop]

Originally Posted by mikstr

Please Larry, post the dyno sheet for "Mr RC45" again so we can play "spot the torque dip(s)", it is soooooooo much fun

You laugh but I'm so screwed because no one makes an after market power
commander for my bike... too few RC45 in the world for the companies to ante up...

[Busy Little Shop]

Originally Posted by johnyisthedevil

I have to admit that a v-4 is my favorite engine architecture but I prefer the screamer cranks. to bad they are crap though, eh Larry?

No V4s are crap Johny... if you go for your favorite architect you also have
the option between a screamer or droner... I prefer the droner and so does
HRC Honda...

[roadkill]

Originally Posted by Busy Little Shop

No V4s are crap Johny... if you go for your favorite architect you also have
the option between a screamer or droner... I prefer the droner and so does
HRC Honda...

They sure seemed to have "droned" past quite a few podiums this year. Maybe next year they can find better riders for their superior engine architecture.

[mikstr]

Well Larry, I must admit the dyno sheet you posted there looks quite nice, not at all like an earlier one you had posted which had more peaks and valleys than the Rockies.... are you sure that's for your bike? It looks a lot like the flat torque curve of a modern I4....

[Busy Little Shop]

Originally Posted by mikstr

Well Larry, I must admit the dyno sheet you posted there looks quite nice, not at all like an earlier one you had posted which had more peaks and valleys than the Rockies.... are you sure that's for your bike? It looks a lot like the flat torque curve of a modern I4....

That early one was with the stock pipe which Honda saw fit to place some nasty dents to curb sound in
order to pass Federal Noise Standards... but the new sheet is for my custom titanium pipe hand built by fellow
RC45 owner Rob... it sports taper header pipes...

RC45 Club members over in Europe are petitioning Power Commander to
ante up a unit for us... other than that our only avenue is the HRC wiring
harness... HRC ECU and HRC mixture adjusters...

Stock RC45 pipe dents...


RC45 custom titanium pipe by Rob Lindeman...

[thatkindasux]

it sounded a lot different

[Old Baldy]

Originally Posted by Busy Little Shop

other than that our only avenue is the HRC wiring
harness... HRC ECU and HRC mixture adjusters...

Or a nice, pricy Motec ECU...

[mikstr]

"Sorry Larry but times have moved on since 1994..
in line 4s are the future,as shown by yamaha,kawasaki,BMW,Suzuki GSXR series(the 1000 WSBK isnt far behind the V4 moto gp bike in terms of power.;..)Honda's main bikes,MV AGUSTA,and the next wave of machines,600s or what ever
V4's are dinosours of the eighties.Who want twice as many heads,cams etc.its a stupid idea..........."

Where is the damn popcorn smilie?

[Stocky]

Originally Posted by Busy Little Shop

You laugh but I'm so screwed because no one makes an after market power
commander for my bike... too few RC45 in the world for the companies to ante up...

If Powercommander aren't any good you should try Motty AFR Tuner

It'll do a better job too.

[GAMBLER]

YouTube Video

rock out with your cock out

[sqd8r]

Originally Posted by Busy Little Shop

That's a nice dyno run... for a 600.

[aus_rc45]

^^^ a sports 600 could only dream of having a torque curve that flat!!!

my HRC equipped 45 has an incredibly flat torque curve from 5800rpm thru to 14200rpm, it looks like it was draw with a ruler.....I doubt a 600 could match that!

[nomo]

All this talk of "cammy" power curves could make one forget that most bike companies are actually trying to incorporate a power hit in the upper rpm register on some models precisely b/c this makes the bike more exciting and more fun to drive . I'm not talking dead at the bottom and Niagara Falls up top , but a noticeable surge to get the blood boiling . I know this characteristic is one of the things I love about my RC-51 , the way it really wakes up at 7K and rushes to redline . Granted , low end torque and a progressive power band make a bike more practical , user-friendly , and can improve lap times (depending on one's riding style of course) , but a big part of riding motorcycles is emotion , and a power spike just feels cool . And yes , I concur that even current I-4 superbikes are very torquey and progressive , producing awesome lunge from down low all the way to redline . With the intense competion between bike companies , they would all be building V-4's if this were the clearly superior architecture ; it's just not so . Modern intake/exhaust design , FI mapping , and now crank phasing have allowed engineers to tailor whatever power characteristics they want .

[johnyisthedevil]

Originally Posted by Busy Little Shop

You laugh but I'm so screwed because no one makes an after market power
commander for my bike... too few RC45 in the world for the companies to ante up.

I have two words for you Larry "mega squirt" check it out. look for the "microsquirt" setup. it's a DIY fuel injection that is not expensive and very powerfull. you can run it as a stand alone or as a piggy back. it's only limited by your knowledge and skills.

[hebgan]

Okay all your race and tech types what do you make of this????

Yamaha has posted in the R1 the specs section the gear ratios of the 2009 R1. I don't have a complete understanding of WHY certain gear ratios/primary and secondary might be chosen. BUT, I do know that using a speed/gearing calculator I found over at RC51.org that the gears are much lower than my ZX10R. For me to gear my ZX similiar for speed/rpms I would have to go front -1 and rear +1 to be close.

That seems REALLY big to me.

Why would Yamaha choose or need to do this?

[sburns2421]

I know that the overly tall gearing on many bikes is due to the testing procedures for sound and/or tailpipe emissions. It may be that Yamaha has been able to reduce these enough to offer lower gearing from the factory, rather than the first mod some people do of changing sprockets.