Pro "Device" on Stewarts Bike?

James

Staff member
Ok so what the hell were they talking about? All I got was that Stewart had something on his rear wheel that possibly calculates its speed and was connected to a computer by the engine (CDI, part of the EFI)?

:lol: As much crap as I've given Erin Bates on her interviewing skills (or lack of), that was just awesome. :lol: :hail::hail: She actually had Bubba speechless when she asked him about it.
 
My understanding was that it measured wheel spin? Traction control is a no-no so that is pushing the envelope. Bubba did get a bit unnerved. :smirk:
 
"uhh I don't know about you guys,yall looking at some dirt or something." She pissed him off. she's good at that. I think Nedge is correct. if that is the case and you can program that efi on wheel spin or to match power at a given point will help alot to some degree. you can still crash just as easy.:smirk:
 
He said it was a piece of dirt :devil: I'm going with checking wheel spin against the motors rpm speed to measure how much traction they are losing. I don't think it is "traction control". Plus thus will be the buzz now all week and we know that team likes to be in front on that as well.
 

James

Staff member
My understanding was that it measured wheel spin?
I'm going with checking wheel spin against the motors rpm speed to measure how much traction they are losing. I don't think it is "traction control".
Correct me if I'm wrong but to figure out wheel spin you need two data points, right? A sensor to get the rear wheel's speed and then also the actual speed of the bike, which would have to be the front wheel (or a radar gun mounted on the bike :smirk:). Since the drive is chain and not belt, the engine RPM and rear wheel speed should be the same. :thinking: Unless you're checking for clutch slippage as that should be the only thing with a variable in it, from the engine to the rear wheel. :noidea:
 
Exactly! And I assume that after it measures the RPMs it measures the distance moved to figure out how the wheel spin. Then to regulate the wheel spin it plays with the EFI mapping to get the most traction avaliable. SCORE! :banana:
 

James

Staff member
Exactly! And I assume that after it measures the RPMs it measures the distance moved to figure out how the wheel spin.
No I'm saying that that's not how you get the wheel spin "number" as you'd need to know how fast the bike is actually going. The sensor on the rear wheel OR engine RPM only tells you how fast it SHOULD be going, hence the need for the actual bike speed. Either via the front tire as it has no power, not the most accurate way though as it's not always on the ground (wheelie) or it's sliding.

My source is personal experience, no seriously it is. :P Heavy farm equipment (tractors) will a lot of time have a wheel slippage indicator, which gives you a good reference point on how deep to set whatever you're pulling (disc, plow, etc.). The way the one I always used worked, is with a sensor on the rear wheel to get the true wheel speed and a radar gun mounted underneath getting the true ground speed. It would always make the police radar detectors go off. :lol:
 
No I'm saying that that's not how you get the wheel spin "number" as you'd need to know how fast the bike is actually going. The sensor on the rear wheel OR engine RPM only tells you how fast it SHOULD be going, hence the need for the actual bike speed. Either via the front tire as it has no power, not the most accurate way though as it's not always on the ground (wheelie) or it's sliding.

My source is personal experience, no seriously it is. :P Heavy farm equipment (tractors) will a lot of time have a wheel slippage indicator, which gives you a good reference point on how deep to set whatever you're pulling (disc, plow, etc.). The way the one I always used worked, is with a sensor on the rear wheel to get the true wheel speed and a radar gun mounted underneath getting the true ground speed. It would always make the police radar detectors go off. :lol:
and there may be. or a gps speed indication?
 

James

Staff member
and there may be. or a gps speed indication?
:bonk: Or GPS, didn't think of that, however that would have to be one hell of a GPS to refresh fast enough. Not to mention if it's indoors, GPS not work so great. :bonk:
 

James

Staff member
Just a clump of dirt... nothing to see here, now move along..

:wink:
:lol:

In all honesty I'm 99% sure it didn't have anything to do with traction control.

I went back and listened to the JGR communication again, from what Jeremy was saying this isn't the first race it's been used in. Plus he called it a wheel speed sensor, I'm guessing it's just data collection. :noidea:
 
"uhh I don't know about you guys,yall looking at some dirt or something." She pissed him off. she's good at that. I think Nedge is correct. if that is the case and you can program that efi on wheel spin or to match power at a given point will help alot to some degree. you can still crash just as easy.:smirk:

You got that right! Remember her pissing off Justin Barcia? :lol:


Recently, I have not been too thrilled to see her every race. Find us a new hot woman that knows what she's talking about! And has less of a tendency to piss people off.
 
I remember after she chased down Stewart after a crash and asked him what happened. Thats the one I think where his dad was close by and you could see Stewart cussing.:lol:



That fight at hang town vid below was pretty good.:smirk:
 
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