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Tire and gear ratio choice for R4

Started by DOCinCanton , Feb 06 2017 09:48 PM

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#1 DOCinCanton

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Posted 06 February 2017 - 09:48 PM

I read in last year's R4 posting that the main tire choice was some form of Wonder rubber. Does that still hold?

 

And, what about the gear ratio on this King track and the power level? What is the track voltage?

 

Any tips will be appreciated.


Doc Dougherty
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#2 Brinkley47

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Posted 06 February 2017 - 10:03 PM

I ran Retros two years ago and Wonder last year.

 

9/28 in all classes.

 

I think the power is 14.1, not 100% on that.


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#3 Jay Guard

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Posted 06 February 2017 - 10:03 PM

Hey Doc:

 

I always start with a 9/27 gear ratio and often go up a tooth or sometimes down a tooth on the crown gear as the conditions and motor dictate.  I'm not sure as to the exact voltage but it is "up there."

 

As for tires I (and some others) find that medium Thunder works very well.

 

That said I think there are a lot of guys running (JK and Koford?) soft and medium Wonder rubber. I'm not sure how many are using Kelly Retros but I'm sure there are a few, however that may be a bit soft for this track.


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#4 Cap Henry

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Posted 06 February 2017 - 10:59 PM

Last year I won GTC on Joe Dirt Wonder big hub, won Can-Am on JK Wonder small hub, and TQ'd F1 on Kelly Retros, but the Retros were too soft.

 

I ran 9/28 for gearing on the Hawks.


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#5 DOCinCanton

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Posted 06 February 2017 - 11:13 PM

Thank you very much for the help.


Doc Dougherty
GRRR 2016 GT Coupe and Stock Car Champion and Overall Champion
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#6 willy wonka

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Posted 07 February 2017 - 09:27 AM

Last year I won GTC on Joe Dirt Wonder big hub, won Can-Am on JK Wonder small hub, and TQ'd F1 on Kelly Retros, but the Retros were too soft.
 
I ran 9/28 for gearing on the Hawks.


Just do what Cap does. LOL.
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#7 Cap Henry

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Posted 07 February 2017 - 09:57 AM

I wouldn't recommend Retros again, whatever Willy had for F1 was better than what I had LOL.

#8 Tom Thumb Hobbies

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Posted 07 February 2017 - 11:19 AM

All great suggestions. From the tech sheets gearing is almost 95% 9/28. The predominate tire is JK #8703PPW followed by #8713PPW and Alpha Wonder.

Alpha's new soft Wonder is also starting to be used more and more and is virtually identical to the Joe Dirt tires.
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#9 DOCinCanton

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Posted 07 February 2017 - 12:19 PM

Having never raced on or even seen this track, nailing down the gear ratio and getting close to the right rubber is a huge benefit to me.


Doc Dougherty
GRRR 2016 GT Coupe and Stock Car Champion and Overall Champion
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#10 Jimmy Williams

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Posted 07 February 2017 - 01:37 PM

I was on Kellys last year for GTC and Can-Am but that is because I prefer my cars to be tight, it's much more drivable for me.


#11 slick in the slot

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Posted 07 February 2017 - 01:38 PM

Having never raced on or even seen this track, nailing down the gear ratio and getting close to the right rubber is a huge benefit to me.

 

Just drive the car, Doc. :)


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#12 Jay Guard

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Posted 07 February 2017 - 03:06 PM

Hey Doc:

 

Now that you have all of the "inside info" on how to go fast at the R4 you have no excuse for not winning.  :D


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#13 Cheater

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Posted 07 February 2017 - 03:08 PM

Yep, definitely trash talk... LOL!


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#14 Shooter7mustang

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Posted 07 February 2017 - 08:09 PM

Hey, somebody told me if I had big ones I could run 8/27.

 

What say ye?


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#15 MSwiss

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Posted 08 February 2017 - 09:10 AM

Did you mean 9/27?

8/27 would be more conservative than 9/28.

IOW, more acceleration and brakes, cooler running, but less top speed.


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#16 slick in the slot

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Posted 08 February 2017 - 11:23 AM

Mike,

Are you certain the "big ones" shooter refers to are tires? :)
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#17 Shooter7mustang

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Posted 08 February 2017 - 01:14 PM

I meant 9/28.

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#18 Shooter7mustang

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Posted 08 February 2017 - 01:14 PM

Yeah, big tires.

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#19 Cap Henry

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Posted 08 February 2017 - 01:57 PM

Is your chassis jigged for bigger tires? You can definitely run different gearing if running bigger tires, but if the chassis is jigged for normal tires, the lack of handling in corners will be outweigh the gained straight line speed.

#20 Jason Holmes

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Posted 08 February 2017 - 03:35 PM

You should try 10/29.

 

jason


#21 willy wonka

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Posted 09 February 2017 - 07:25 AM

:)  :)  :)


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#22 911GT3

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Posted 12 February 2017 - 09:21 AM

Car data for gearing and tires can be found HERE.
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#23 DOCinCanton

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Posted 14 February 2017 - 01:02 PM

I did a search for the medium Thunder rubber that is recommended above. I came up with part#: TH-2017. Is that correct?


Doc Dougherty
GRRR 2016 GT Coupe and Stock Car Champion and Overall Champion
My Series Spring 2016 4" NASCAR, JK LMP State Champion, and Endurance State Champion
My Series 2015 4" NASCAR, GTP and Endurance State Champion
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​GRRR 2013 & 2014 Evil Flexi Champion
1968 Cleveland Car Model Series race winner - Tom Thumb Raceway, North Royalton, Ohio
​1968 Hinsdale ARCO Amateur runner-up
1967 Parma Raceway Indy 500 Champion

#24 Matt Sheldon

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Posted 14 February 2017 - 01:59 PM

In a .850" tire with .500" full hub, you are correct, Doc.

Matt Sheldon

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#25 Jason Holmes

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Posted 14 February 2017 - 10:48 PM

They also have Thunder Med part #PJ5002 and PJ5007.
 
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