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FWD TOURING CAR FORUM - Tamiya FF01, FF02, Yokomo YRF-2, Kyosho Mantis FF

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FWD TOURING CAR FORUM - Tamiya FF01, FF02, Yokomo YRF-2, Kyosho Mantis FF

Old 07-29-2019, 02:31 PM
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Originally Posted by Nerobro View Post
Small changes in drive-train drag can have rather significant changes in top speed.
But top speed isn't everything. Shaft drive is more efficient than belt drive, still, shaft drive is used less.
Now when I'm thinking about it, has anyone tested belt drive vs geared drive in FF? Isn't geared drive more efficient, too?
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Old 07-29-2019, 02:40 PM
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Amusingly, that (belt versus shaft) came up in another thread. Consistent chassis performance won out over outright efficiency. Motor torque tweaking the chassis is likely why the highest end tamiya shaft drive uses a bevel drive to put the motor perpendicular to the chassis instead of inline.

A single stage belt, (pinion, spur, two belt pulleys) is likely to be more efficient, than a 3 gear transmission. (with pinon, spur, diff gear, idler gear, drive gear) Assuming good belt tension, and a low hysteresis belt. Given the pulley diameters we use.. that might be less true. That said, gear and belt drive FF cars are out there.
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Old 07-29-2019, 02:46 PM
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Amusingly, that (belt versus shaft) came up in another thread. Consistent chassis performance won out over outright efficiency. ​​​​​​
And that's my point, we don't know yet, how both concepts perfirm against each other. Saying one is better just by taking one parameter out of many others is not right way to decide.

Last edited by Papi; 07-29-2019 at 10:34 PM.
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Old 07-29-2019, 02:55 PM
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Originally Posted by Papi View Post
And that's my point, we don't know yet, how both concepts perform against each other. Saying one is better just by taking one parameter out of many others is not right way to decide.
Belt versus gear FWD? Well... it seems all the big manufacturers are going to belt FWD. Gear FWD seems to be a legacy of "we have gearboxes we can use".
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Old 07-29-2019, 03:54 PM
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Originally Posted by Nerobro View Post
Belt versus gear FWD? Well... it seems all the big manufacturers are going to belt FWD. Gear FWD seems to be a legacy of "we have gearboxes we can use".
You could say the same about belts. So far, most belt driven FWDs are based on belt driven AWDs. I think that manufacturers don't care about drivetrain efficiency at this stage. They just chose something that works and optimisation comes later, if FWD becomes large enough.
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Old 07-29-2019, 06:20 PM
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Originally Posted by Nicadrauspro4 View Post
Do the math...

Less gears, more spinning ratio transferred to the wheels. More gears, speed is reduced. I'm not trying to convince you because my point isn't a theory. It's a fact. Do the math (oops I already said that).
You're completely ignoring what I'm saying. I didn't say the transmission isn't more efficient. I'm saying it's not a massive difference, and it's not enough to overcome the handling limitations. Getting around a track fast is about more than just the drivetrain.

And why do you keep using the term "spinning ratio" to describe the advantage? You can easily adjust the ratio by changing the gear sizes in both direct drive or gearbox arrangements. All that really matters is efficiency.
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Old 07-29-2019, 06:38 PM
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So much action in the Fwd forum wow Are there enough benches to continue racing guys?
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Old 07-29-2019, 11:37 PM
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Originally Posted by Nerobro View Post
Belt versus gear FWD?
I meant single gear vs 3 gear/belt. Sorry I didn't read/write properly yesterday...
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Old 08-01-2019, 01:23 AM
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My current FFs

FF-01, FF-03 RR (road rally - newly built), FF-03 Pro-R (my own version)
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Old 08-02-2019, 04:18 PM
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My Yoko YR-F2 is still going strong...
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Old 08-05-2019, 08:15 PM
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I am new to front wheel drive and was wondering what a good gear ratio range is for 25.5?
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Old 08-06-2019, 06:20 AM
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Can't believe I never saw this thread. I've had a Tamiya FF-03 for a few years. She sat on the shelf collecting dust as I thought it would be garbage to drive. Lots of fun building it though. Started running it two months ago in a parking garage with some friends,. OMG.. this thing is awesome. Especially for a kit build set up. Three of my friends drove it and went out and bought one. Unfortunately one of them went for the M-07 instead as he likes minis.

​​​​​​But yeah, kit tires work wonderfully once worn in a little. It amazes me how planted the cars are. When we run the FFs, it's some of the closest racing we have. In other words, lots of tire swirlies on the body sides, lol. We've done the gear diff swap on the two FF-03 cars, and I've added the aluminum motor plate and turnbuckles to mine. We run either 15t can motors, or 3300kv brushless motors. And they are so close you'd need a slo-mo camera to see who crosses the line first.

Looking forward to reading more, and discussing more.
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Old 08-11-2019, 04:55 PM
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I've started up a FB group for FWD racing as it seems to be slowly gaining some interest.
https://www.facebook.com/groups/308654646587560/
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Old 08-11-2019, 09:15 PM
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Originally Posted by tony gray View Post
I've started up a FB group for FWD racing as it seems to be slowly gaining some interest.
https://www.facebook.com/groups/308654646587560/
Sorry I don't do FB
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Old 08-13-2019, 05:54 PM
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Good news
First time Novice big race passed weekend and TQ and won ( good job Grant's)
My Yokomo FWD
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