Preferred CVT |
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Paboaglez
Bolt Sorter Joined: Feb/25/2014 Location: México Status: Offline Points: 14 |
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So, in Rochester 2013, 6 of the top 10 endurace race used Gaged...
In theory is best to have a big overall ratio for our Briggs engine, like CVTech 3:1, 0.43:1 overall ideal and theorical = 6.98 But as I have read and asked; Gaged Ratios: Gaged with 6" Drive and 8" Drive; 4:1 and 0.9:1 OR = 4.44 Gx9 3.5:1, .85:1 OR = 4.11 Gx7 3:1, .65:1 OR = 4.61 The overall ratio, (low speed ratio/ high speed ratio), in Gaged is way lower to the CVTech... So my question is why Gaged CVT is better CVT for Bajas?? I would say: Is lighter like 30% High efficiency the low speed ratio is bigger than CVTech all above I am not sure, so maybe you can help me, do someone has data about it (efficiency and real ratios) Thank you in advance |
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Paboaglez
Bolt Sorter Joined: Feb/25/2014 Location: México Status: Offline Points: 14 |
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Is easier to tune
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njgedr
Welding Master Joined: Oct/05/2010 Location: Ortonville MI Status: Offline Points: 194 |
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Eventually, I expect to see some scooter clutches in baja cars. They are sized perfectly for ~10 hp We are always working with them here at Gates, they are so much smaller, lighter, and simpler than the Polaris or Gaged. If anyone is interested in specifics I can try to get some scooter models they go in. The US is not a very big scooter country, I guess that is why many teams have not seen them before.
I found that CVT tuning in baja has much less effect than snowmobiles or something with a steeper torque curve. There is still value in tuning, but narrowing down on the exact weights and springs never had much effect for us. I would much rather have a smaller lower inertia CVT with less tunability. However, Laval had their CVTech figured out pretty good... unless it was just weight. I attribute the Cornell performance to launch control and weight.
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Rowan Baja 2009-2012
Auburn 09 Peoria 11 Epreuve Du Norde 12 Auburn 12 Wisconsin 12 Mubea Development Engineer |
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Paboaglez
Bolt Sorter Joined: Feb/25/2014 Location: México Status: Offline Points: 14 |
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could you post some information of this scooter cvt?? webpage or specifications???
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Richie_Dagger
Baja Godfather Joined: Sep/25/2011 Location: Las Vegas, NV Status: Offline Points: 615 |
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Pedro UFPBaja
Baja Godfather Joined: Mar/03/2010 Location: Brazil Status: Offline Points: 886 |
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Thas how a baja car runs with a scooter cvt:
The smoke is the belt frying. A baja is at least twice heavy and the engine was 3 or 4 times more torque but with 1/3 of the rpm. Absolutely incompatible.
Edited by Pedro UFPBaja - Apr/01/2014 at 3:31am |
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Former Team Captain
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Richie_Dagger
Baja Godfather Joined: Sep/25/2011 Location: Las Vegas, NV Status: Offline Points: 615 |
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I actually thought the smoke was because a complete 2 stroke scooter engine + drivetrain was thrown into that thing! That's some pretty impressive belt smokin'.
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njgedr
Welding Master Joined: Oct/05/2010 Location: Ortonville MI Status: Offline Points: 194 |
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I attribute the smoke to poor tuning on the clutching... probably a Dayco belt too haha. There are scooter clutches out there for around 15-17 hp. Even a scooter clutch designed to run at 5 hp can work if tuned correctly for double the hp and load. Unfortunately I can't share which clutch we are working on, but we are tuning it to handle 15 hp nearly triple what it was designed for. I would guess it is very similar to the clutch out of that smoking car. Even a centrifugal clutch will work on 10 hp, you would be hard pressed to find a cvt that can't be tuned to handle it.
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Rowan Baja 2009-2012
Auburn 09 Peoria 11 Epreuve Du Norde 12 Auburn 12 Wisconsin 12 Mubea Development Engineer |
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Pedro UFPBaja
Baja Godfather Joined: Mar/03/2010 Location: Brazil Status: Offline Points: 886 |
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Many brazilian teams tried to tune a scooter cvts in late 90's, noone get even close to the performance of the good old comet 780 that time.
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Former Team Captain
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NanMohz
Bolt Sorter Joined: May/29/2014 Status: Offline Points: 13 |
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We are planning to use a hybrid CVT this year (Keeping our comet 780 secondary as such and buying a new primary). So have any of you guys out here have tried using hybrid's? Since many of the manufacturers provide CVT's specifically tuned for BAJA, will our option be a finer one to choose indeed?
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TEAM AGRAGANYA BAJA
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Akron 1998 to 2004
Welding Master Thread Hijack Champion Joined: Jan/20/2011 Location: WA Status: Offline Points: 327 |
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What's your goal? Specific range of gears, tune ability, something else? Is there a deficiency with the 780 you are trying to correct? |
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Richie_Dagger
Baja Godfather Joined: Sep/25/2011 Location: Las Vegas, NV Status: Offline Points: 615 |
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We are putting together a P90 Primary/CVTech secondary hybrid. I believe OSU ran the same hybrid setup? I really like the P90 primary. Easy to dissemble, very tune-able, and lighter than our CVTech primary.
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paasch
Welding Master Joined: Feb/17/2009 Location: Corvallis, OR Status: Offline Points: 234 |
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We've never run a CVTech at competition. We used Polaris 2001-2010, then switched to Gaged in 2011. We tested CVTech in 2008, but found it not as tune-able as the Polaris.
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Bob Paasch
Faculty Advisor Oregon State SAE |
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Soccerdan7
Organizer Joined: Sep/22/2010 Location: CA Status: Offline Points: 780 |
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We ran a Polaris P90 / CVTech (heavily modified) secondary. It worked quite well for our 2010 and 2011 cars before we switched to the Gaged CVT. Be mindful of different belt widths, angles, etc... A hybrid can be tricky.
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Danny
Cornell (fall'07 - spring'12) Former Captain / MEng / that guy with all the carbon 10 races, 7 top ten's, 2 overall wins |
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instinct
Double Secret Probation Joined: Mar/13/2016 Location: India Status: Offline Points: 2 |
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How is it possible for CVT to remain on its engagement rpm all the time when its changing ratio from initial to final value. I think CVT changes its ratio only because of increase in its rpm....could u plz explain
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drvr5
Welding Master Joined: Jun/27/2013 Status: Offline Points: 193 |
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Well, the secondary rpm increases as you accelerate. The rest is down to the magic of springs, cams, and physics
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abishek
Double Secret Probation Joined: Mar/14/2015 Location: coimbatore Status: Offline Points: 2 |
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how to do a cvt tuning in a polaris
can u help me with it |
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sujandinesh
Baja Godfather Joined: Dec/27/2013 Location: Enschede Status: Offline Points: 494 |
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My man, no human being in the world can help you effectively tune a CVT by a mere conversation in a forum.
A lot of teams in India have used/still use Polaris. Why not contact them?
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RVCE BAJA: 2011-2015
General Motors: 2015-2016 Tyre Testing - University Racing Eindhoven: 2016-2017 Tyre Dynamics - TASS International: 2017-2018 Tyre Engineer - Apollo Vredestein The Netherlands |
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SAIKUMAR983
Double Secret Probation Joined: May/14/2018 Location: india Status: Offline Points: 2 |
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still, they providing for free. If yes then tell me where I have to order
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RLM
Baja Godfather Joined: Nov/15/2012 Location: Hamilton, ON Status: Offline Points: 1258 |
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Free CVT? LOLOLOLOLOLOLOLOLOLOLOLOLOL This made my day
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McMaster Baja Racing (09-Dec 2015)
Team Captain 2012-2015 Suspension Lead 2015-2016 All spoonfeed PM requests will be billed at $10 USD per reply, payable via paypal. |
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Andy.R
Welding Master Joined: Dec/02/2014 Location: Ames, IA Status: Offline Points: 150 |
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I love the 2 years between replies
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Andrew Raudabaugh
-Cyclone Off Road Racing 2013-18 -Aspiring Lottery Winner -Just show up and do things |
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vin2000
Welding Master Joined: Sep/23/2013 Location: Bangalore,INDIA Status: Offline Points: 147 |
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Hmm after two years do we have any new CVT OEM in town? A lot of teams are pushing towards the custom ones but I have a feeling something will come up on the map just like AFCO shocks!
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RVCE-BAJA
2011-2015 www.thrbaja.com |
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Max RG
Double Secret Probation Joined: Aug/28/2019 Location: México Status: Offline Points: 2 |
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Hi. I have a doubt about this question. What is and what is the use of "overall"?
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