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Old 11-03-2017, 07:03 AM   #1
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Default FDR for touring mod

Hi gents,
I just bought an Orion 4.5t and am trying to adjust it for the optimal gear ratio. At the moment itís sitting at about 5.7 FDR but I was thinking of dropping it to 4.0 FDR via a 72t spur and 36t pinion as I need more speed. I run 48 pitch. Itís being run in blinky mode right now.
Can anyone advise on whether this will be a safe ratio to use with my motor and esc?
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Old 11-03-2017, 07:39 AM   #2
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We run a FDR of 7.6 with a 4.5 and 7.4 with a 5.0 in blinky mode.
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Old 11-03-2017, 07:50 AM   #3
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Originally Posted by mick8488 View Post
Hi gents,
I just bought an Orion 4.5t and am trying to adjust it for the optimal gear ratio. At the moment itís sitting at about 5.7 FDR but I was thinking of dropping it to 4.0 FDR via a 72t spur and 36t pinion as I need more speed. I run 48 pitch. Itís being run in blinky mode right now.
Can anyone advise on whether this will be a safe ratio to use with my motor and esc?
What size track?
You're going to wrong way with gear ratio's, you want 7.1-8.0 even if running a mod motor in blinky mode.
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Old 11-03-2017, 09:07 AM   #4
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Here this should give you a little guideline adjust according to your track
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FDR for touring mod-9adfa86f-6498-4aa4-adcf-79ed289595dc.jpeg  
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Old 11-03-2017, 04:07 PM   #5
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No 2.5t or 3.5t boosted gearing ??? I guess they would be too fast ...lol.... I guess 8.8fdr to 10.2fdr would do just fine....
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Old 11-03-2017, 04:11 PM   #6
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No 2.5t or 3.5t boosted gearing ??? I guess they would be too fast ...lol.... I guess 8.8fdr to 10.2fdr would do just fine....
Top TC drivers don't run 3.5's, they boost 4.5 and 5.0's (or blinky on smaller tracks)
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Old 11-03-2017, 04:12 PM   #7
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Top TC drivers don't run 3.5's, they boost 4.5 and 5.0's (or blinky on smaller tracks)
Lead, never follow!!!.... LoL... Lots of power left to play with....
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Old 11-03-2017, 04:22 PM   #8
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Lead, never follow!!!.... LoL... Lots of power left to play with....
If a multitude of world champions don't need it, no one else does.
Just means you have a car that's more of a handful in the in field.
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Old 11-03-2017, 04:34 PM   #9
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World Champions are perfect drivers, unlike most of us... We need a little advantage sometimes down the straight to make up for our imperfections: it is always possible to dial back the throttle to make things manageable without having to purchase a weaker motor... Everyone is entitled to their opinions, but showing up with less power is not something I would recommend in Mod racing or any other type of racing...Happy Racing....
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Old 11-03-2017, 06:16 PM   #10
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Originally Posted by bertrandsv87 View Post
World Champions are perfect drivers, unlike most of us... We need a little advantage sometimes down the straight to make up for our imperfections: it is always possible to dial back the throttle to make things manageable without having to purchase a weaker motor... Everyone is entitled to their opinions, but showing up with less power is not something I would recommend in Mod racing or any other type of racing...Happy Racing....
The amount you gain on the straight won't make up for what you'll lose on the infield when the overpowered motor makes the car harder to drive. Others have tried hotter motors and switch back when they find their lap times are better with the more mild motors. Plus you can always just boost and turbo to get the straight line speed anyway.
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Old 11-03-2017, 07:31 PM   #11
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What size track?
You're going to wrong way with gear ratio's, you want 7.1-8.0 even if running a mod motor in blinky mode.
It's a small track, front main straight with largely tight and twisty corners. Why would I increase my FDR? Wouldn't I lose out on speed?
My aim to get to an optimal FDR without boost as I don't think I need it for club racing.
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Old 11-03-2017, 08:08 PM   #12
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Originally Posted by Marcos.J View Post
Here this should give you a little guideline adjust according to your track
that little chart is surprisingly identical to my current settings
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Old 11-03-2017, 08:28 PM   #13
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Originally Posted by mick8488 View Post
It's a small track, front main straight with largely tight and twisty corners. Why would I increase my FDR? Wouldn't I lose out on speed?
My aim to get to an optimal FDR without boost as I don't think I need it for club racing.
If it's a small track that's mainly tight and twisty corners, gearing for straight line speed will only slow you down.

Why would you want to avoid running boost? Conservative boost settings actually makes the motor run more efficiently than using static timing.

Here's an in depth article that talks about timing theory, and there are links to other articles covering how it applies to both blinky and boost

https://pphaneuf.github.io/rccars/ar...timing-theory/
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Old 11-03-2017, 08:57 PM   #14
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Thanks for the gigaplex, I'll be reading carefully over that article.
I guess I want to do one thing at a time. So I'll get my FDR right than look at boost. Why is the FDR higher for mod than stock?
Also, my mod motor came preset without about 30 degrees timing on the can. I wound that back to start off with only about 5 degrees but what do mod drivers normally do with can timing and what is the reasoning behind it?
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Old 11-03-2017, 09:01 PM   #15
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Quote:
Originally Posted by mick8488 View Post
It's a small track, front main straight with largely tight and twisty corners. Why would I increase my FDR? Wouldn't I lose out on speed?
My aim to get to an optimal FDR without boost as I don't think I need it for club racing.
Because decreasing your fdr means your actually slowing down your car.
It is similar to driving a race car around a track in 6th gear,the motor can't work to it's full potential.
Set your fdr to around 7.6 and watch what happens you may even find it's to quick,then drop the fdr down to 7.2 which will tame it down.
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