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500 vs 800 vs 990 vs TC

Joined Jul 2007
57 Posts | 0+
In a couple other topics folks have been debating 500's being more similar to 800's than 990's, how traction control works, and the like. I don't know if people just don't research the tech stuff or what, but I'll spew what I know.

Starting with TC, the two main types of TC I know about are based on wheel spin detected by sensors in the wheels or other parts connected to the wheels (rotor, axle, cush drive, etc.), and ECU based by detecting sudden radical changes in eigine RPM's (the one Suzuki used to cheat their way into AMA dominance). TC does not have any effect on an engine's overall power. It typically cuts spark and/or fuel to certain cylinders to limit output in the event of a detected slide. It has been speculated that Suzuki was using the ECU based method in AMA because Mladin and Spies NEVER spun a wheel in all of 2006. I have about 30 magazines with 5 - 10 pictures in each one showing them going through a turn faster than anyone else with no spin while Zemke, Duhamel, etc. were all lighting them up. TC can be applied to just about anything with a motor and wheels so yes, 500's can be tamed.

Which brings me to the CC debate. The only thing 800's share with 500's is they're lighter than the 990's. Regarding engine behavior, 500's are very similar to the 990's. That is why they picked the 990's to replace the 500's afterall. The 990's were much easier to ride than the 500's because of engine management and traction control, but still highsided like a ...... The 800's are more like 250's in riding style, but as has been pointed out they are just as fast as the 990's. In fact they're still mean as hell too. I don't remember who it was, but I saw someone highsided this year. I think it was Pedrosa. People keep saying that the 800's are weak, but that's a crock. While all the Jap 800's might seem so, Ducati's GP7 has a lot of grunt. The top speed difference between the GP6 and GP7 was 2 - 3 MPH at the start of the season. The reason the Jap bikes lack balls is because they're still using the Big Bang system (which was used to tame overly powerful engines) which doesn't work as well with 200cc's less and less available fuel. Ducati's main strength this year (as pointed out by many including their team boss) is not TC, but engine management. They are using a more standard engine approach which makes constant power instead of spaced out power pulses, and relying on their engine management to keep it all in check. Now this may involve some form of ECU based TC, but no one really knows so I'll just leave it at that.

Finally, you guys need to stop getting your panties in a bunch about who's favorite rider is their momma's hero's jesus and all that. Congrats to Casey and Ducati. I'm still a Rossi fan, but I was hoping Casey would win since Quatar and I've been pulling for Duc since '03. I love Ducati's. Sexiest damn bikes in the world. I also love Kawi's. Great motors, man. It'd be nice if Hopper could win it in '08, but yeah... My point is that you guys act like just because Rossi, Hayden, Stoner, etc. wins the championship it means that everyone from that rider's homeland wins. Sure. The USA's had it's handful of champs, but you don't see us acting like we're the best riders in the world. Best at everything else, maybe, but most American's are cocky .........
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Personally, I don't think us American's know .... about bikes. I only get one or two US bike mags a quarter, but I pick up TWO, PB, and Bike religiously... but I'm off topic again. Dammit it's late. Go to sleep already!
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P.S: Stop trashing Pedro too. That kid has talent. If you're gonna talk .... about him then redirect it at his ... headed monkey trainer Puig. I hate that guy.
 
Nice post dude, i like to read someone else is on roughly the same page as me!!
 
i agree with a lot if what you say. my question is, would the gp7 in screamer config be ridable <u>without </u>TC.

<div class='quotetop'>QUOTE<div class='quotemain'>The reason the Jap bikes lack balls is because they're still using the Big Bang system (which was used to tame overly powerful engines) which doesn't work as well with 200cc's less and less available fuel. Ducati's main strength this year (as pointed out by many including their team boss) is not TC, but engine management.
 
I think we are leaving two important things out of the analysis

1. Tires
2. Race tracks

Tires could not handle the brute power of the 990cc. So many of them were detuned/made less peaky, making them easier to ride.

If the race tracks had longer tstraights, the 990cc lap times wouldbe much lower than the 800cc lap times. the tracks were just too small for the 990cc to be used to full potential. (Which is why Yamaha with seeming lower power than Ducati or Honda won so many races)


For a given race track, smaller the engine, the more peaky the HP delivery will have to be to make max HP. That makes a smaller displacement bike harder to ride (becuase the power came on suddenly at certain RPM, and if you were leaned over at that time, he was history)

The only tool engineers used to have to tame these peaky beasts was big bang firing order. The HP delivery was still peaky, but the pulses (like ant lock brakes) made wheel spin a little more controllable. But, this was at the expense of peak power and fuel economy. IMHO, big bang was a step backwards.

Electronics have gotten better and now TC units can react quickly enough and are precise enough to handle the demands of the rider. Its palying a bigger part now as the displacements have been decreased to 800cc and engines have again beacome more peaky.
 
<div class='quotetop'>QUOTE(motojt @ Nov 15 2007, 08:43 AM) [snapback]100851[/snapback]<div class='quotemain'>
P.S: Stop trashing Pedro too. That kid has talent. If you're gonna talk .... about him then redirect it at his ... headed monkey trainer Puig. I hate that guy.


he is kinda short though. . .you gotta admit
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<div class='quotetop'>QUOTE(motojt @ Nov 15 2007, 08:43 AM) [snapback]100851[/snapback]<div class='quotemain'>
Which brings me to the CC debate. The only thing 800's share with 500's is they're lighter than the 990's. Regarding engine behavior, 500's are very similar to the 990's. That is why they picked the 990's to replace the 500's afterall.


i'll agree with everything else except for this...

the 800s are exactly the same weight as the old 990....stands to reason when you want to slow the bikes down. if you cut displacement and weight, there will be no benefit as the power/weight ratio will stay constant.

the only real similarity between the 990 and the 500s was that at the time, the 990 was able to theoretically push out about the same amount of BHP as the old 500s...but the 990 had a much fatter broader spread of torque.....easier to ride if TC was removed from both machines.
imagine a V5 2 stroke? would you ever get it to hook up on any surface?
 
<div class='quotetop'>QUOTE(motojt @ Nov 15 2007, 12:43 AM) [snapback]100851[/snapback]<div class='quotemain'>TC can be applied to just about anything with a motor and wheels so yes, 500's can be tamed.


this is just flat out incorrect. one of the major motivators in moving from strokers to 4 strokes was that nobody could get EMS to play nice with 2 strokes.
 
Kez, yeah Dani is a damn midget... I concede that point.
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BigAl, because a 2-stroke makes power on ever revolution and a 4-stroke makes power every other, a 500cc 2-stroke is about equivalent to a 1000cc 4-stroke. So if you're talking about a 990cc V5 2-stroke, then yes, that'd be hard to control since it'd be like riding around with 2000cc's of 4-stroke muscle under your crotch. Also, unless what I've dug up from magazines and the web is wrong, the minimum weight difference is only 3kg (6.6Lbs) from 2006 to 2007. I don't think power:weight is the same this year because I can't see how 190cc's is equivalent to 7Lbs. 190cc's in a race motor should be good for at least 50HP.

By the way, who was it who said the 800's and 250's benefit from a point and shoot riding style?! That's a high power riding style. 250's and 800's are all about late braking and high corner speed.


<div class='quotetop'>QUOTE(drumfu @ Nov 15 2007, 11:44 PM) [snapback]101022[/snapback]<div class='quotemain'>
one of the major motivators in moving from strokers to 4 strokes was that nobody could get EMS to play nice with 2 strokes.

Yeah, EMS. Not traction control. If you can detect wheel spin you can cut spark at the very least. That's rudimentary TC. Hell, I could put traction control on my lawnmower if I had the time. Plus, that was like 5 years ago. How much has the technology improved since then?
 
<div class='quotetop'>QUOTE(drumfu @ Nov 15 2007, 11:44 PM) [snapback]101022[/snapback]<div class='quotemain'>
this is just flat out incorrect. one of the major motivators in moving from strokers to 4 strokes was that nobody could get EMS to play nice with 2 strokes.


<div class='quotetop'>QUOTE(motojt @ Nov 15 2007, 11:58 PM) [snapback]101023[/snapback]<div class='quotemain'>
Yeah, EMS. Not traction control. If you can detect wheel spin you can cut spark at the very least. That's rudimentary TC. Hell, I could put traction control on my lawnmower if I had the time. Plus, that was like 5 years ago. How much has the technology improved since then?

motojt - Have you ever ridden a 500 two stroke? If you were the calibration engineer on a TC 2-stroke and I was a rider, I'd goof off sick!! As drumfu says they couldn't get TC to "play nice with 2 strokes".
Remember that lawnmower racing is a separate (and very real category) where TC is probably only important on wet grass
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<div class='quotetop'>QUOTE(yamaka46 @ Nov 16 2007, 12:11 AM) [snapback]101029[/snapback]<div class='quotemain'>
As drumfu says they couldn't get TC to "play nice with 2 strokes".
Remember that lawnmower racing is a separate (and very real category) where TC is probably only important on wet grass
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drumfu said EMS. But like I said that was 5 years ago. I think they might be able to manage it now with the higher speed/more powerful ECU's they have these days... it's kinda pointless to debate this one though since no one's gonna be concerned about their old sMokers getting lose come race day.
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Nowthen, when are we gonna have the grass cutting race at Misano, Yamaka?! I nominate Bikegirl for head chearleader!
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<div class='quotetop'>QUOTE(motojt @ Nov 15 2007, 03:58 PM) [snapback]101023[/snapback]<div class='quotemain'>
a 2-stroke makes power on ever revolution and a 4-stroke makes power every other, a 500cc 2-stroke is about equivalent to a 1000cc 4-stroke.



They covered this in Faster, the theory was they would be equivalent but as we all saw they were not even close.
 
<div class='quotetop'>QUOTE(motojt @ Nov 15 2007, 11:58 PM) [snapback]101023[/snapback]<div class='quotemain'>
Yeah, EMS. Not traction control. If you can detect wheel spin you can cut spark at the very least. That's rudimentary TC.



<div class='quotetop'>QUOTE(motojt @ Nov 16 2007, 12:18 AM) [snapback]101031[/snapback]<div class='quotemain'>
drumfu said EMS. But like I said that was 5 years ago. I think they might be able to manage it now with the higher speed/more powerful ECU's they have these days... it's kinda pointless to debate this one though since no one's gonna be concerned about their old sMokers getting lose come race day.
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Nowthen, when are we gonna have the grass cutting race at Misano, Yamaka?! I nominate Bikegirl for head chearleader!
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My reply was aimed at the scary concept of just cutting the spark on a 2-stroke. Once in the power band a 500 (road version) 2-stroke is on a mission and I'd hate some calibrator to try to cut the spark as an attempt at TC... Especially remember that big 4 strokers had vicious power bands..
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As far as your second comment goes, although I never got the chance to take my 500 Gamma round the track, I really think that TC wouldn't help much when you get it wrong whilst in the power band...

Finally...
A lawnmower ride-on WC/ship... - email Dorna in case Motogp gets too boring...
 
Screw that, man, they'd kill the fun! I'm not fitting my Craftsman with Michelin rubber just to keep them from bailing on MowerGP, no f'ing way!
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<div class='quotetop'>QUOTE(drumfu @ Nov 15 2007, 11:44 PM) [snapback]101022[/snapback]<div class='quotemain'>
this is just flat out incorrect. one of the major motivators in moving from strokers to 4 strokes was that nobody could get EMS to play nice with 2 strokes.

.........
 
<div class='quotetop'>QUOTE(motojt @ Nov 16 2007, 01:18 AM) [snapback]101031[/snapback]<div class='quotemain'>

Nowthen, when are we gonna have the grass cutting race at Misano, Yamaka?! I nominate Bikegirl for head chearleader!
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I'm not into cheerleading (though Jumkie surely would beg to differ).
If you race something real (ie not lawnmowers) I'm in though - 2 wheels or 4- you pick..AND I'll whip your ..... too.
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<div class='quotetop'>QUOTE(motojt @ Nov 16 2007, 05:05 AM) [snapback]101055[/snapback]<div class='quotemain'>
Screw that, man, they'd kill the fun! I'm not fitting my Craftsman with Michelin rubber just to keep them from bailing on MowerGP, no f'ing way!
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<div class='quotetop'>QUOTE(motojt @ Nov 16 2007, 12:58 AM) [snapback]101023[/snapback]<div class='quotemain'>


By the way, who was it who said the 800's and 250's benefit from a point and shoot riding style?! That's a high power riding style. 250's and 800's are all about late braking and high corner speed.



I was more or less quoting Stoner from an interview where he compared his as Capirossis riding style. Capirossi is the one who ride traditional 250 style while Stoner claimed that he and Pedrosa had a similar "half way" point and shoot style they both developed in 250 with lower mid corner speed but better line out. Obviously not as noticable as with the 500s but non the less different from other 250 riders and different from Capirossi.

Capirossi more or less confirmed the differences in a later interview.

Don't shoot me, I'm just the messenger
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Btw. The 800s are closer to the 990s than anything. Look at weight, engine type, power, rotational mass, everything is closer to the 990 than any thing else. While it did change the style, and more than expected, it's still not close to 250 in any sense. Compared to the 990 it's a small noch closer to the 250s but it's many notches down there.
 
<div class='quotetop'>QUOTE(hopper_fan @ Nov 16 2007, 01:28 AM) [snapback]101034[/snapback]<div class='quotemain'>
They covered this in Faster, the theory was they would be equivalent but as we all saw they were not even close.


The rough equation double strokes = double power is totally incorrect because strokes are not all equal, strokes have quality also. The stroke from a 4-strokes engine has better quality then the stroke from a 2-strokes unit, due to better and more efficient combustion, filling of the cylinder during the intake phase no overlap between intake and exhaust phases, etc.

This became obvious when the 990 were racing against the 500. But it was well known since decades, I think the real reason they made the 4 strokes so big was not to match the 500s' power but to get more torque and make them a little easier to ride. Rememebr, there was very little electronics back in 2002, just the basics. Nowadays' TCs are VERY complex systems.
 
<div class='quotetop'>QUOTE(motojt @ Nov 15 2007, 12:43 AM) [snapback]100851[/snapback]<div class='quotemain'>
Personally, I don't think us American's know .... about bikes. I only get one or two US bike mags a quarter, but I pick up TWO, PB, and Bike religiously... but I'm off topic again. Dammit it's late. Go to sleep already!
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P.S: Stop trashing Pedro too. That kid has talent. If you're gonna talk .... about him then redirect it at his ... headed monkey trainer Puig. I hate that guy.


What a political hack
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Cultural self-loathing is so en vogue in America these days, you'll get no respect from me for sucking euro .... like a beta-male. You're an American, so you should get comfortable with our flaws
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Besides, who writes a post damning people for taking advantage of cultural identity, while using cultural identity to brand is fellow countrymen with ignoble character traits? I'm thinking of a guy, first name begins with Benedict last name starts with Arnold.

The beauty of America is that you're supposed to be able to invent whatever you want to be without taking pot-shots at your fellow citizens or fighting a culturally/economically oppressive machine. Sadly, America isn't quite the way it was envisioned. That is our only failure.
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Now you know why we're such hot ...., we've only screwed one thing up!
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However, I do agree that the 800's HAVE THE POTENTIAL to be far more beastly than the 990's. Ducati has proved that in the presence of electronics, peak power reigns supreme. The 800s are extremely peaky engines and while the can't smoke the tires like a 990, the nature of top end power means it can get away from you quicker than your body can react.

That's all I know.
 
<div class='quotetop'>QUOTE(drumfu @ Nov 15 2007, 03:44 PM) [snapback]101022[/snapback]<div class='quotemain'>
this is just flat out incorrect. one of the major motivators in moving from strokers to 4 strokes was that nobody could get EMS to play nice with 2 strokes.


So therefore taming a 500 is impossible.

Thank you medieval Catholic church.
 

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