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Messages - steelman

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1
Chassis / Re: FOUR WHEEL STEER
« on: April 27, 2007, 10:46:36 am »
is this a bashing forum or a place to talk about racing and how to make our racers as far as punctuation goes if you are  that small of a man you cant handle it and feel the need to be a jerk stop reading you do have a choice here

 :noplease:

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Chassis / Re: FOUR WHEEL STEER
« on: April 26, 2007, 08:17:54 pm »
getting interesting now i love it
so ford in your drawing you used the example where the front and rear turn the same direction but you neglcted to draw them turning opposite which is what im thinking about yeilds some different results now doesent it

my goal here is to build a c/p with an opposed twin of coarse which ive been told are great boat anchors by one of the mower racing gods who will remain unnamed but yet don has one of mine as we speak and im sure we will get some hard facts when he starts to build pretty sure it will go like heck or blow the odds are not in his favor but the man has performed miracles before and many here can testify to that so you see this whole build is about doing what they say cant be done inovation is what dreams are all about where would mower racing be without those insane ohv motors

so back to yhe four wheel steering i absolutly see your point randy and i can say i have yet to meet a person with a more helpful and brilliant mind and i am very appreciative but one day i will need to pass you on the coarse and that will take a combination of money skill and inovation! money sucks i hate spending it as far as skill you have a few years on me so here we are inovation central

i have a link to wikpedia in it you will find some interesting info on steering. ackerman seems to be the hot steering ticket with mower racers here is the jist of what i got when i checked out ackerman steering

  Modern cars do not use pure Ackermann steering, partly because it ignores important dynamic and compliant effects, but the principle is sound for low speed manoeuvres.

http://en.wikipedia.org/wiki/Steering#Four-wheel_steering

just remember what people would have said or did say about racing mowers before some of the greats that made this sport what it is came along and pleeeeeeeaaaaase dont be afraid to think outside the box anything is possible the only thing that matters is if you posess the determination to figure it out :woo:

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Chassis / Re: FOUR WHEEL STEER
« on: April 26, 2007, 04:04:39 pm »
yea seems to be no definate this is good but alot of not worth it

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Chassis / Re: FOUR WHEEL STEER
« on: April 26, 2007, 01:23:43 pm »
From 1989 -1999 there were 3 models of Skyline GT-R produced. The R32, R33, and the R34. Each features the RB26DETT engine, ATTESA E-TS all wheel drive system, and Nissan's Super HICAS four wheel steering system.

From 1991 -1997 the Skyline was undefeated in N1 endurance racing in Japan, winning 50 times.

looks like it works for some
here is what wikpedia has to say

[edit] Four-wheel steering

[edit] The system
Four-wheel steering (or all wheel steering) is a system employed by some vehicles to increase vehicle stability while maneuvering at high speed, or to decrease turning radius at low speed.

In most four-wheel steering systems, the rear wheels are steered by a computer and actuators. The rear wheels generally cannot turn as far as the front wheels.

Sports cars sometimes include four-wheel steering for stability at high speeds. When performing an abrupt lane change at highway speeds, for example, a car with four-wheel steering will avoid rear suspension loading common in two-wheel steering cars. Because the rear wheels steer in the same direction as the front wheels, the car is transitioned more gently into turning.

Alternatively, several systems, including Delphi's Quadrasteer and the system in Honda's Prelude line, allow for the rear wheels to be steered in the opposite direction as the front wheels during low speeds. This allows the vehicle to turn in a significantly smaller radius — sometimes critical for large trucks or vehicles with trailers.


[edit] Recent application
All four wheels turn at the same time when you steer. There are controls to switch off the rear steer and options to steer only the rear wheel independent of the front wheels. At slow speeds (e.g. parking) the rear wheels turn opposite of the front wheels, reducing the turning radius by up to twenty-five percent, while at higher speeds both front and rear wheels turn alike (electronically controlled), so that the vehicle may change position with less yaw, enhancing straight-line stability. The "Snaking effect" experienced during motorway drives while towing a caravan is thus largely nullified. Four-wheel steering found its most widespread use in monster trucks, where maneuverability in small arenas is critical, and it is also popular in large farm vehicles and trucks.

General Motors offers Delphi's Quadrasteer in their consumer Silverado/Sierra and Suburban/Yukon. However, only 16,500 vehicles have been sold with this system since its introduction in 2002 through 2004. Due to this low demand, GM will not offer the technology on the 2007 update to these vehicles.

Previously, Honda had four-wheel steering as an option in their 1988-1994 Prelude, and Mazda also offered four-wheel steering on the 626 and MX6 in 1988. Neither system was very popular, in that whatever improvement they brought to these already excellent-handling vehicles was offset by an unavoidable decrease in sensitivity caused by the increased weight and complexity.

Some vehicles (like Peugeot 306) offer a form of "passive" four-wheel steering, where the bushings by which the rear suspension attaches to the automobile are designed to compress in a precise direction under the forces of steering, thus slightly altering the rear suspension geometry in such a manner as to enhance stability.


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Chassis / Re: FOUR WHEEL STEER
« on: April 26, 2007, 10:36:09 am »
NO COMPUTER ROCKEY IT JUST PIVOTS THE REAR AXLE IF YOU WANT CHECK OUT THE NISSAN SKYLINE IN RALLY RACING PRETTY SURE ITS FOUR WHEEL STEER

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Chassis / Re: FOUR WHEEL STEER
« on: April 25, 2007, 06:49:56 pm »
i wont dispute at all paul about the difficulty that could arise with this setup but all racing is about getting an edge over the other drivers among other things is this an edge i dont know and wont rule it out untill im told its not legal or proven to be a bad setup so could we talk about what could be done to make it work like adjustable steering arm to change the rate of turn for the rear (by the way dont get me wrong i do appreciate the advice paul i just dont like giving up on an idea untill im sure it wont work) 

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Chassis / Re: FOUR WHEEL STEER
« on: April 25, 2007, 04:15:33 pm »
SEEMS I AM ONE OF THOSE ATLM GUYS BUT I WANT TO BUILD A C/P ALSO AND CHRIS I WILL TALK TO YOU LATER ABUT A RECOVERY VEHICLE AT ATLM SITE
HEY SQUIDD CANT I GET AN ENGINEERS VEIW HERE SEEMS IT WOULD ELIMINATE THE NEED TO LIFT THE REAR TIRE TO ME

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Chassis / FOUR WHEEL STEER
« on: April 25, 2007, 01:19:59 pm »
DOES ANYBODY HAVE ANY OPINIONS ON FOUR WHEEL STEERING I CANT FIND ANYTHING IN THE RULES ABOUT IT (I JUST PICKED UP A 91 CRAFTSMAN WITH IT) IS IT LEGAL :confused:

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Admin Announcements / Re: Add yourself to the Mowbetter map!
« on: April 01, 2007, 02:39:58 am »
just added myself it worked flawlessly and absolutly no problem with speed about 5 min for the whole deal

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Driveline / Re: 40# chain breaking - idler
« on: March 06, 2007, 01:27:09 pm »
that helps a ton guys i usually dont take the first bit of advice i get without tripple checking it so its nice to hear you debate it the info is a lot more valuable that way so the last bit of info i need is how loose is acceptable maybe 1" of movement?

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Driveline / Re: 40# chain breaking - idler
« on: March 04, 2007, 12:33:11 pm »
hey thanks guys im still wondering about adjustment or do you just get it close and use the idler

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Driveline / Re: 40# chain breaking - idler
« on: March 04, 2007, 02:15:07 am »
yea you did randy seems the forum tok a leap back in time i lost my messages posts and time logged in from last night got a backup in e-mail to refer to but i still need to know how to tighten the chain to begin with i cant remember seeing any adjustment in georges build :confused:

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Driveline / 40# chain breaking - idler
« on: March 02, 2007, 01:48:38 am »
im have a craftman that used to be a hydro i swapped it out in favor of a 700 tranny and a peerless rear axle its not to insane of a build only 30 mph the problem i have is im tearing up sprockets trannys and chains this is probably due to no idler. if it slips i tighten it but if you go to tight you spin the bushing on the output shaft and your case is junk so the question is can anybody show me pics of how and where to mount the idler and should i upgrade to a bigger chain  also would the flex of that wimpy rear end be a problem?

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Driveline / Re: Indetify This tranny
« on: March 02, 2007, 01:21:50 am »
ihave a dynamark with a 2300 cant remember exactly what size pullys i put on it i think 6" up front and 4" in back that gets you 15 mph in 4th it has a tendancy to pop out of gear in 4th if you hammer the clutch but that could be a wear problem as far as 1st and 2nd they are worthless unless you want to pull really big stuff around the yard beyond that its seems pretty bullet proof i would not race it due to the extreme weight i bet its over 100 pounds but it would be great for a trail mower (atlm ?) i have used mine for a mud machine for about 1 1/2 years now

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Chassis / Re: Ackerman Steering Set-Up help needed!
« on: February 27, 2007, 10:48:49 am »
HEY RANDY TRY THE WHAT BURT KNOWS INFO ON THE USLMRA SITE HEY HAS QUITE A BIT OF INFO ON ACKERMAN STEERING IF THAT DOESENT WORK LET ME KNOW I WILL EMAIL IT TO YOU

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