K1 AERO Shorty mod

[Carlos69]

If you want to run a shorty in your Aero read on....
You'll need ...
a KF shorty conversion kit
A DB01 belt (123t)
3 x 5x8x2.5 bearings + shims
A Dremel with a cutting disk & needle file (or a milling machine)
Carefully grind 2 comers off the square faced bearing tensioner mount
so that it will slide down the extra mm. Place smaller diameter bearings on, you may want to shim the .5mm difference with the 3 narrower bearings.
Assemble with Durga belt, grind the relevant notches into the side
guards for the shorty retaining brackets ... done !

[knighthawk]

Just a question, but will the KF Shorty Conversion not fit if you get the lower half of the gearbox of the KF to ?

[Carlos69]

Just a question, but will the KF Shorty Conversion not fit if you get the lower half of the gearbox of the KF to ?
Not sure .... do they both (KF&Aero lower rear diff halves) have the same part #'s ? Even if they are the same; the KF shorty conversion kit isn't a direct fit, as the KF motormount/spur assembly is positioned further to the rear than the Aero/K1 thus uses a shorter belt (117t)

[Carlos69]

300+ views ... Anyone tried this mod yet ? I haven't had the time to test it thoroughly due to work & weather :(
Interested to hear any feedback ...
Cheers
Carl

[Miho]

I have tried this with 5x8x2.5 bearing and shims, with the same dbo1 belt.I done one race meet it seems to be holding up ok.

[Carlos69]

Good to hear yours has worked out, Yeah mine has been holding up pretty good too ... good way to slim down this buggy to a respectable weight. Did you mod the rear pulley & adapt the side guards to fit the shorty brackets ok ? Got a pic ?
Cheers

[Miho]

Good to hear yours has worked out, Yeah mine has been holding up pretty good too ... good way to slim down this buggy to a respectable weight. Did you mod the rear pulley & adapt the side guards to fit the shorty brackets ok ? Got a pic ?
Cheers

I did mod the rear pulley the shorty bracket fit, this is my first time on the forum from Australia. I will try to get a picture on here.

[wrighty]

has anyone got a part number for the db01 belt

[KBRacing]

:confused: What is the advantage of running with a short pack in the rear, on a K1 Aero ....???

P.s. part number.: OP-1140

[wrighty]

dont know at the momet however a shorty is lighter that saddles

[wrighty]

ran today using the shorty pack found the car was a lot more agile and very stable it didnt lose any rear grip the only changes to setup where a longer rear camber link and i droped down the spring rate to 2.0lb.

in rd 1 i ran saddles and track was damp rd2 i ran shorty and lap times where pretty much the same however the track was very wet and greasey

in flight the car felt more stable and also it seamed to be a lot faster out of the corners

[Thomas B]

Anyone still driving this mod? Better then sadlepack?

[Carlos69]

I still have mine in, although I haven't had alot of track time to test it
(have been a bit of a non active participant in rc for about the last year or so)
and nor can I compare with saddle setup as I went straight to the shorty config.
Apart from the obvious; weight saving is the only input I can give, plus possibility some additional rotation depending where the shorty is, ie forwards to centralize weight.

[wrighty]

I've ran it quite abit but always go back to saddles . I'm not sure the weight saving is any advantage and found in incidences it made the do funny things I've run it with alloy carbon and s1 chassis ball and gear diffs and both big bore and small bore shocks and always end up going back to saddles
I'm in the process of putting together a different layout moving the center trans more rearward and placing the shortly in front of the motor

[Carlos69]

Sounds interesting... please let us know your findings 👍

[Dave Dodd]

ive recently done this mod to my k1 (cheaper than buying more brca saddles).

parts used:
kf lower diff mounts
db01 belt
cougar sv front axle (used as a tensioner shaft) kf tensioner would have worked but didnt have a spare one.
rc10 front wheels flange bearings (for tensioner) these are a smaller diameter than the std ones and allows the belt to be level between tensioners, allowing the shorty to placed better for weight distribution. (i had it forward)
some shims

no dremaling needed. :D

raced at robinhood raceway last sunday and was awesome :D

[knighthawk]

ive recently done this mod to my k1 (cheaper than buying more brca saddles).

parts used:
kf lower diff mounts
db01 belt
cougar sv front axle (used as a tensioner shaft) kf tensioner would have worked but didnt have a spare one.
rc10 front wheels flange bearings (for tensioner) these are a smaller diameter than the std ones and allows the belt to be level between tensioners, allowing the shorty to placed better for weight distribution. (i had it forward)
some shims

no dremaling needed. :D

raced at robinhood raceway last sunday and was awesome :D

Are there any pics of your car ?

[Dkfream]

My mate has just done a shorty mod on his k1 aero and it's perfect, all you need is a belt and tensioner shaft/bearings and that's it, no need to replace anything else, will get the part numbers from him and post in here for you

[Dave Dodd]

Are there any pics of your car ?

I'll sort some pics :)

[Dkfream]

U2238 125T belt
U2698 5x10x4 bearing
U4468 Belt adjuster

Parts used to convert to shorty

[Dave Dodd]

You can just see the rear belt tensioner too.
https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xta1/v/t1.0-9/944316_10209403516628248_5831282638927606701_n.jpg ?oh=711a67b3d31f14295b5f9e77a8361ac8&oe=578326C5

https://scontent-lhr3-1.xx.fbcdn.net/hphotos-xaf1/v/t1.0-9/1958327_10209403517068259_3591181077521856180_n.jp g?oh=50a9b1110670a25f8d93317fcdfb0973&oe=577D8EFF

[chris24jt]

ive just done the mod and tried it last night, my rear belt does appear to be much closer together than the picture above, i was concerned about it rubbing when running if it was looser or is this not an issue.

initial thoughts were positive although i had poor balance from the tires and was messing about but got some new tires to try for the next couple of weeks.

where are people putting the lipo - forward or back? i found at the back gave a bit too much rotation so ended with it in the middle

[Dave Dodd]

I run it with the lipo forward, not actually tried it in a different position yet.

[Garny D]

Has anyone also used the steering conversion kit for this as well....??? WHat parts are needed for this?

Cheers
G

[Dave Dodd]

A little update: car ran brilliant at the last regional (a1 astro), plenty of speed and great acceleration.
Lightweight lipo in the forward position and handles the bumps really well. car just makes minimum weight.
Next round will be on grass, may need to add weight once the grass wears out. Will see. :)