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Old 03-24-2009, 07:48 AM   #1
Marc Miller
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Exclamation Ar28

Baseline Set-Up information for Birel AR28
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Old 03-24-2009, 11:14 AM   #2
Marc Miller
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-Camber should be 0 to 2mm positive on the stand.
-Caster is 15 degrees static (central pills) and we have run up to 16.5 degrees (1.5 degree pill) in the heat of the summer IF the tires show an understeer.
-Adding caster will only make the kart harder to push in the pits, but, again if the tires do not show an understeer I wouldn't worry about it.
-Remember when you are using the Sniper gauge; one box equals 2mm not 2 degrees, one dot equals 1mm.
-2 degrees of positive camber means that you have 12 degree spindles on a 10 degree kart.
-We have had AR28 CX's as both 10 and 12 degree front ends...the R30C has only come in as a 10 degree kart.
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Old 03-24-2009, 01:35 PM   #3
Marc Miller
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AR28z baseline

This is for MG SLE tires on a decent track (not too slippery, not too sticky).

-Spindles in the middle
-central pills
-5 1/8" front wheels
-no front bar, one thick and one thin spacer wide
-1040-F axle in the middle and up position
-short rear hubs, 1 1/2" in from the end of the axle
-5 1/8" rear wheels, no secondary seat stays
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Old 03-29-2009, 08:57 PM   #4
dmd2477
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Is there a baseline setup for NewCastle or will this work?
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Old 04-01-2009, 12:33 PM   #5
Garry Lobaugh
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This is the base line. Until you go test, I don't think we will find a magic answer as each driver is different. At this time of the year the grip conditions are going to be much different than when you might have left the track last fall. I'd urge everyone to get out and test as soon as possible at their favorite track.

This is a good starting point for you from our experience.
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Old 08-27-2009, 08:57 AM   #6
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Gary

Is there a chart or map for lack of a better word that helps give you a guide to tuning? We are just getting started and Im looking for info like if the front is pushing narrow the front track, when to add the front brace in, when to widen and narrow the rear track width etc...

I realize I will build this info as we go on but it seems the basic tuning info would be pretty standard and available somewhere. Hope to make our first race labor day weekend if all goes well...

Sean Rupp
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Old 08-27-2009, 09:29 AM   #7
Garry Lobaugh
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This is an excellent question Sean. One of my winter time projects is to take all of the postings that Chris, Tim and Marc have made on the forum and create such a handy tracking device.'

At the moment, I do not have anything published. But send me an email at mrp@qtm.net for me to capture your email address and I'll forward a document that we use in our Winter Seminars under chassis tuning. It is the closest thing I have at the moment that will be of assistance to you.

Winter seminars start the first Saturday of December and each month after that during the off season. This year we are looking at doing a web seminar service for interested long distance viewers.
Look forward to seeing you Labor Day weekend.
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Old 01-09-2013, 04:16 PM   #8
Scorekeper
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Default Additional Information

Can you elaborate further on the base setup for the AR-28Z? In particular, I'm looking for front and rear track values, spindle location (centered?), and seat mounting measurements. We will be campaigning an AR-28Z in Junior Sportsman with a Yamaha engine and Bridgestone YLCs in mostly street races but an occasional permanent track (Whiteland, IN).
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Old 01-09-2013, 07:38 PM   #9
Marc Miller
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Quote:
Originally Posted by Scorekeper View Post
Can you elaborate further on the base setup for the AR-28Z? In particular, I'm looking for front and rear track values, spindle location (centered?), and seat mounting measurements. We will be campaigning an AR-28Z in Junior Sportsman with a Yamaha engine and Bridgestone YLCs in mostly street races but an occasional permanent track (Whiteland, IN).
Hi Scorekeeper,

I believe this would be the best answer to your question. At www.BirelAmerica.com there is a downloadable PDF for baseline chassis set-up for this particular chassis. The link is here: https://www.youtube.com/watch?v=mktKCuAeq64

This chassis was designed for Yamaha/100cc Sportsman classes and has been very successful. The "C" compound Bridgestone is what the baseline is made for.

I hope that helps and good luck!

Marc
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Old 01-12-2013, 01:41 PM   #10
Chris Lobaugh
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In terms of a baseline set up for the AR28Z in sportsman with YLC tires; spindles in the middle, 1 thick and 1 thin spacer wide, no front bar, .5 degree caster in, 2mm toe out, camber between 0 and 2mm negative. Start with a 1040x30x2.5 F axle in the middle wheelbase position, axle down (chassis up), and short rear hubs set flush with the end of the axle key. If you are running on a tight track you can shorten the wheelbase but I doubt you will ever need to go long with the wheelbase.

in terms of seat position I don't have my notes in front of me at the moment but if you let me know which seat (size and manufacturer) I will give you the specs on Monday. Hope this helps
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Old 01-13-2013, 05:04 PM   #11
Scorekeper
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Default Thanx Guys!

Just what I needed, Chris and Marc, Although Marc, I found a promotional piece on the AR28 on the website and the link is to a YouTube song by LifeHouse. LOL

As for seat, I'll have to look but I believe it is a factory Birel small (for a 10-11 year-old).

Last edited by Scorekeper; 01-13-2013 at 05:05 PM.
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