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Old 07-29-2016, 08:27 AM   -   Wikipost
R/C Tech Forums Thread Wiki: New Schumacher KF2
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Welcome to the KF2 Wiki!

Please feel free to add any Tips, Tricks, or anything that would be beneficial to the KF2 Family

Introduction and Pictures Introduction and Pictures

ElectronicsSetupElectronicsSetups

Setup SheetsSetup Sheets

EmulsionShocksEmulsion Shocks

Tony Newland Gear Diff BuildTony Newland Gear Diff Build

Suggested Gearing

6.5
7.5
8.5
9.5
10.5
13.5
17.5 I ran 69/31 at SRS Scottsdale Arizona and 72/30 at MHOR Aurora Co and Full Throttle ALB, NM RCM lockout worked excellent!


MIP pucks excellent upgrade! The new RCM lockout is an excellent piece as well! These options will greatly reduce weight throughout the drive line!

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Old 05-13-2016, 06:54 AM   #826
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I've seen the arguments against carpet, but having seen the track surface at OCRC etc. Is that really off road either? It doesn't look like 'dirt' to me!

With AE bringing a carpet biased car, maybe more carpet/astro tracks will pop up?

I don't know why more tracks don't lay carpet/astro, it's cleaner, consistant and less maintenance.

There is a local Astro track and the guys are good there, but the track is super narrow with some large jumps. Small errors=big breaks.
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Old 05-13-2016, 09:37 AM   #827
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This car is a monster on carpet. We have a big carpet track and the Schumachers own the x-rays, kyoshos, and AE cars.

Carpet and astro is the future of the hobby. It's pretty hard to talk a building owner into letting you dump truckloads of dirt inside their building and then water it down. Just the mold issue is enough to send the building owners screaming out the door.
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Old 05-13-2016, 10:25 AM   #828
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This car is a monster on carpet. We have a big carpet track and the Schumachers own the x-rays, kyoshos, and AE cars.

Carpet and astro is the future of the hobby. It's pretty hard to talk a building owner into letting you dump truckloads of dirt inside their building and then water it down. Just the mold issue is enough to send the building owners screaming out the door.
The track in Grants Pass will be a over 6000sqft of astro. Should be done by the end of the month. You guys will have to make a trip down .
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Old 05-13-2016, 07:04 PM   #829
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Wow, where is this?
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Old 05-13-2016, 08:51 PM   #830
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Oregon
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Old 05-15-2016, 09:53 AM   #831
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The track in Grants Pass will be a over 6000sqft of astro. Should be done by the end of the month. You guys will have to make a trip down .
Holy crap thats huge!
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Old 05-22-2016, 02:53 AM   #832
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Hi All. Just had a question regarding balance. Im a complete noob at offroad but have about 20 years of onroad experience. My first time driving, bar one battery pack, was a big event. I started off poorly but got better and better. Jumps took some time to start to master!

Anyhow I really enjoyed it and am keen to improve the KF2. It was a clay low grip circuit which is besides the point, but I was hoping to get some light shed on the weight of the car and the 61/39 balance I see written. Is there some explanation of why this is the 'magic' number. My car weighed stock (with a bit of extra alloy) at 1650g and a 58/42 balance. It might go some way to explaining why the car was super loose until the track grooved up. I found myself setting up to control looseness and then could step back once track got better.

Ive bought the carbon chassis and all titanium turnbuckles. Was running the low grip motor right the way back setup

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Old 05-22-2016, 04:08 AM   #833
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I don't believe in magic numbers in RC or real racing. 61% happens to be the most rear weight I could get without doing anything stupid or spending a bunch of money.

Oversimplified: If your car runs better with the rear hubs all the way forward, you need more rear weight.

PS if you're not running a ball diff, you need to be.
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Old 05-22-2016, 12:28 PM   #834
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Ideally, you want the rear weight bias to be somewhere in the 61-63% range. Any less than that and you'll struggle to get rear traction on anything less than high traction tracks as you have experienced. More than the 61-63 and you're sacrificing turning for rear traction.

If you're racing on low grip I'd suggest the SV2. The KF2 MM may be a better option than the low grip conversion.
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Old 05-22-2016, 02:21 PM   #835
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Thanks for replies. Does MM conversion have more rear weight bias? I am about to get new batteries that weigh about 150g from memory down from 200 i use now. Presume low grip would be better in that instance as motor is heavier. Should prob look at light er ESC or move it back behind battery
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Old 05-22-2016, 03:31 PM   #836
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Quote:
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Thanks for replies. Does MM conversion have more rear weight bias? I am about to get new batteries that weigh about 150g from memory down from 200 i use now. Presume low grip would be better in that instance as motor is heavier. Should prob look at light er ESC or move it back behind battery
The MM option has slightly more rearward bias, but you'll still need to add weight in the rear. The main benefit of moving the motor further rearward is that the turning tendencies of the motor have more of an effect on the chassis generating more rear grip. In the low grip option the motor is so close to the CG (I think it is in front of the CG) that it virtually has no effect on generating additional traction.
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Old 05-22-2016, 05:36 PM   #837
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Ah sorry I think I have that already. Motoro all the way back and battery in front of it.

Im working on reducing weight now to be able to add it. Have bought carbon chassis. Was still hoping to run side bars but ill see what weight becomes
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Old 05-22-2016, 09:49 PM   #838
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Ah sorry I think I have that already. Motoro all the way back and battery in front of it.

Im working on reducing weight now to be able to add it. Have bought carbon chassis. Was still hoping to run side bars but ill see what weight becomes
Chassis braces a must with carbon chassis. Try titanium screws top of buggy, ball studs, MIP Pucks, ball diff run two plates on slipper if running mod! All this will drop weight and the 5.5 rear hex will help with side bite.
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Old 05-25-2016, 07:19 AM   #839
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Just about to go MM conversion (for options more than anything). Is it really just hot spoons to modify the shell?
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Old 05-25-2016, 09:19 AM   #840
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Either that, a heat gun, or buy the Updated body.
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