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Can-Am Headquarters ...Aurora Wheelers ATV Forum > Tips, Toys, Tires, Ads, Misc > ATV Tech Tips > Maximizing acceleration. |
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| Maximizing acceleration. - ATV Tech Tips - Tips, Toys, Tires, Ads, Misc - Can-Am Headquarters ...Aurora Wheelers ATV Forum | ||||||||||||||||
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turboman Member 
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On a hard dirt surface where there is excellent traction, I believe (propose) that a selective 2WD/4WD atv should accelerate faster in 2WD than in 4WD because of the parasitic losses from driving the front differential and axles and tire drag in 4WD.. Depending on whether or not your machine will "wheelie", in 2WD you'd want to sit toward the back to maximize traction (if the front stays down by itself) or lean on the bars if it tends to lift. You might have to modulate the throttle to prevent too much rear wheel spin depending on how big your engine is. But once your tires grab and give it full throttle I'm proposing that you will accelerate faster in 2WD than 4WD everything else being equal (driver weight, etc.). Rebuttals? \\\\>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>> 
____________________ 800 MaxXT,25"XTR's.RAM GPS,Twin-Air, Ricochet,ELKA fronts,EBC pads,Kevlar cable,PIAA bulbs,grip-reinf's,Leeds hitch,Precision damper,1" Rr spacers,Iridium plugs,Rene'wgts,OEM w/shield,OURY grips,WestCo coated muffler,Saeng mirrors,flares,AGM bat |
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drees Member 
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I think that 4WD will give you better accelaration. By using 4wd you get more horsepower to the road surface. Therefore you can lay in to the throttle more without spinning out. Anybody got access to Timing Triggers? I'd love to try to prove the theory.
____________________ 2005 Sportsman 800 EFI 2004 Sportsman 600 <- For Sale 2004.5 Sportsman 500 HO http://wejustrock.com |
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outlandish Admin 
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Acceleration might be better but what happens to top end?
____________________ Previous BRPs: 03 Rally 200, 03 Outty 400, 05 Outty 400 XT, 06 Outty 800, 07 Renegade 800 Ridden in 6 states and 2 countries Next up? 2010 BRP Side by Side |
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Survey Guy Member 
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Just make it a 50 foot race!
____________________ Fourwheeling is not a crime! Neither is backhanding a Liberal! |
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outlandish Admin
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In 2wd I can't even hook up in 50 feet LOL
____________________ Previous BRPs: 03 Rally 200, 03 Outty 400, 05 Outty 400 XT, 06 Outty 800, 07 Renegade 800 Ridden in 6 states and 2 countries Next up? 2010 BRP Side by Side |
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putt-putt
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Turboman-- I thought the same as you; but the little Subaru cars prove different they smoked the Corvette z6 On takeoff. Plus I thought 2-wheel drive should be faster top end. Haven't tried my Outty yet ,but my Suzuki Vinson is faster all the way around in 4x4. It is 6 mph faster top end in 4-wheel drive.
____________________ Current 800XT Team Outty member #16 & Suzuki Vinson--previously owned Honda 300 & Artic Cat 500 - Yamaha Tri Z 250 |
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turboman Member
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One guy's opinion... could be wrong. The 800's problem is front end lift and rear squat. The rear squat is the biggest problem because it causes the front to lift. The front tires are very lightly loaded and skipping in the air half the time. It takes HP to drive the front differential. Because of wheel lift maybe only 50% of the HP to the front is effective. I'd rather have 100% of HP go to the rear end. But the front has to be kept down (in 2WD) and the rear must be stiffened so it doesn't squat so bad. Ballast on the front rack would be beneficial (100lbs). If was looking for max acceleration I'd put the front and rear shocks on stiffest. Run the lowest profile 25" radial (probably Holeshot ATR's) on the stamped aluminum OEM wheels for lightest unsprung weight. I still feel a MAX has an advantage because the longer wheelbase lessens the tendency to lift the front. The extra 50lbs is peanuts. Riders can be a 200lbs difference. And don't crack the throttle wide open imediately. 3/4 throttle for first 10 feet, listening for wheel squeal. Wheel spin is wasted HP. ALL THE ABOVE APPLIES TO ONLY HARD SURFACE DRAGGING. If there's a traction problem then obviously 4WD would be preferential.  Last edited on Fri Nov 11th, 2005 02:59 am by turboman ____________________ 800 MaxXT,25"XTR's.RAM GPS,Twin-Air, Ricochet,ELKA fronts,EBC pads,Kevlar cable,PIAA bulbs,grip-reinf's,Leeds hitch,Precision damper,1" Rr spacers,Iridium plugs,Rene'wgts,OEM w/shield,OURY grips,WestCo coated muffler,Saeng mirrors,flares,AGM bat |
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BAJA X 
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If you want MAX ACCELERATION, RIDE A DS 650 X  sorry Outlandish just couldn't resist. You know us sport bike riders are a different breed.LOLLast edited on Fri Nov 11th, 2005 06:13 am by BAJA X ____________________ 2004 DS 650 BAJA X 2004 Outlander 400HO XT 2008 XT30SB CrossRoads CrossForce Toy-Hauler 2004 MXZ Adren 800HO & 600HO 1989 H-D Springer Softail 2008 F-350 4x4 Super Duty Crew Cab V10 Tow Command 4.10 gears 2005 F-150 Super Crew FX4 4X4 |
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Survey Guy Member
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BAJA X, my neighbors kid had a Banshee, piped, clutched, and some other things but holy christ did that haul the mail. Very fun but I knew I was about to hurt myself so I quit riding it.
____________________ Fourwheeling is not a crime! Neither is backhanding a Liberal! |
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bartlettracing Member
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baja X .... I have a Baja x with a 30 shot of nos 
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Ductape Member
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Parasitic losses to the front drive are virtually the same engaged or not... all the parts are turning... unless you leave the line on 2 wheels and stay on 2. Traction will be better in 4wd. No way is a strong machine going to get 100% hookup in 2wd on dirt. DT
____________________ BRP800, AC 650 V2, Polaris Ranger 700XP |
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rankrank1 Member
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I agree that it sounds like a contradiction, but we have three 400 Max's in my riding group and all three of them are faster in 4wd even on pavement where traction is not an issue. Additionally, I feel they are much faster in the the woods in 4wd - especially in the corners. I can ride much faster and aggressively in 4wd in any riding situation in 4wd as compared to 2wd
____________________ Current Ride: Red 2005 BRP Outlander Max 400 XT Prior rides: 1996 350 Yamaha Wolverine 4x4, 1992 Suzuki 230 Quadrunner 2x4, 1992 CR500, 1985 CR250, 1984 YZ125, 1981 YZ125, 1979 ATC 110 3 wheeler, 1972 TS125, 197? Chibi 58cc mini. |
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OSOKILL Admin Assist/ Enforcer 
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well look at it this way ..... In 2wd you have two rear wheels pushing everything. Even the UNused weight of the front axles, wheels and tires. Plus the rear wheels have a lifting effect on the front of the vehicle. so instead of going straight forward, its going forward and up. Now 4wd. you have 4 wheels pulling weight equally in a forward direction. no extra unused weight being pushed. in 2wd you have 2 wheels pushing 639 pounds of weight that's 319.5 on each wheel. in 4wd they are all pushing/pulling 159.75 each and that takes less effort to move the weight and thus maximizing the efficiency of yer avail HP and torque
____________________ Team Outty 800 Member #24 |
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turboman Member
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That would be fine if the weight on all 4 wheels were the same. 1/4 of the total weight on each. Perhaps standing still that might be true but not when accelerating from a standing start. The torque twist on the rear axle tends to make the rear squat and the nose lift. With initial rear tire "bite" the weight distribution is probably 90/10. Without added front ballast the front wheels are barely touching the ground and they contribute very little, maybe nothing, to initial acceleration. With locked differentials power goes 50/50 (Visco lock would direct slightly differently). It's wasted on the front wheels the first few seconds of a pull. And that would be where a race would be won. After you get a few lengths ahead of your opponent you should be able to hold it if HP and total weight are similiar.. Just one opinion. Rear tire traction is what will win.
____________________ 800 MaxXT,25"XTR's.RAM GPS,Twin-Air, Ricochet,ELKA fronts,EBC pads,Kevlar cable,PIAA bulbs,grip-reinf's,Leeds hitch,Precision damper,1" Rr spacers,Iridium plugs,Rene'wgts,OEM w/shield,OURY grips,WestCo coated muffler,Saeng mirrors,flares,AGM bat |
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outlandish Admin
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Turboman is right. All the power in the world does you no good if you can't get it to the ground. Many races are won or lost at the starting line. If you were serious about racing, front ballast is the answer. It's hard to win with the front end in the air.
____________________ Previous BRPs: 03 Rally 200, 03 Outty 400, 05 Outty 400 XT, 06 Outty 800, 07 Renegade 800 Ridden in 6 states and 2 countries Next up? 2010 BRP Side by Side |
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OSOKILL Admin Assist/ Enforcer
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there was a custom made all wheel drive corvette around here several years back and it would smoke a reg 2wd vette. the front tires also doing the driving GETS more power to the ground helps get rid of yer burnouts. I wonder if the 800 will still do the easy wheelie in high while locked in 4wd anyone ever try it?? kinda courious lol
____________________ Team Outty 800 Member #24 |
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turboman Member
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Isn't as simple as it sounds. Cars are a whole different ballgame. I'm on my 4th Subaru, 2 of which were 4WD turbos, both of which I ran in Solo2 and a couple drag strip trips. Subarus or 4WD Corvettes (or 4WD Porsche 911 or Audi) don't lift the front wheels off the ground for reasons to lenghy to go into here. Respectfully, not a good comparison.
____________________ 800 MaxXT,25"XTR's.RAM GPS,Twin-Air, Ricochet,ELKA fronts,EBC pads,Kevlar cable,PIAA bulbs,grip-reinf's,Leeds hitch,Precision damper,1" Rr spacers,Iridium plugs,Rene'wgts,OEM w/shield,OURY grips,WestCo coated muffler,Saeng mirrors,flares,AGM bat |
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mopower Member 
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Just race'em already
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A.M.D. Member 
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OSOKILL wrote: there was a custom made all wheel drive corvette around here several years back and it would smoke a reg 2wd vette. the front tires also doing the driving GETS more power to the ground helps get rid of yer burnouts. I wonder if the 800 will still do the easy wheelie in high while locked in 4wd anyone ever try it?? kinda courious lol Mine does. Attachment: racing pics 003 (Medium) (Small).jpg (Downloaded 363 times)
____________________ 06 OUTTY 800 HMF/DOBECK Warn 2500 |
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OSOKILL Admin Assist/ Enforcer
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I tried it to AMD and it seems that mine wheelies even easier when locked in
____________________ Team Outty 800 Member #24 |
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A.M.D. Member
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I'm going to try binding the suspension down next race.What do you think would be the best thing ratchet binders?
____________________ 06 OUTTY 800 HMF/DOBECK Warn 2500 |
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Northern Bomb Man Member 
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Little trick.... Take out about 1 litre of engine oil and then try yer 50 ft times, less oil = less resistance to the crankshaft. Just don't race past a 1/4 mile or U'll see engine damage.
____________________ Coming Soon! Muhahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahahah! |
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OSOKILL Admin Assist/ Enforcer
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Northern Bomb Man wrote: Little trick.... Take out about 1 litre of engine oil and then try yer 50 ft times, less oil = less resistance to the crankshaft. yer service dept getting slow there NBM??? tryin to drum up a little business I see LMAO | |||||||||||||||
