B4.1 XL Roar Legal?

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Old 05-05-2011, 11:30 AM
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Default B4.1 XL Roar Legal?

I know that a few of racers have been swapping the b4 main chassis with the t4 chassis to gain an extra 19mm. A lot of people did this due to the TLR 22 being longer and more stable. My question is: Is the B4 with the longer chassis still roar legal?
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Old 05-05-2011, 11:42 AM
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If you take the wheelbase for the B4.1 @ 273mm and add the 19mm of the T4 chassis, it will give you 292mm. this is the maximum length allowed by ROAR. There will be some variance due to the sweep of the a-arms. I'm interested in trying it myself. The 22 wheelbase is 282.50mm.
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Old 05-05-2011, 11:43 AM
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fwiw i ran a t4 chassis on a b4, handled like a pig. i only used it on huge tracks.
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Old 05-05-2011, 11:45 AM
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I was planning on using it on the larger outdoor tracks built for 1/8th scale buggies and truggies. Right now I cant seem to keep the rear end locked down and was thinking this might help as well...
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Old 05-05-2011, 11:47 AM
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So really it would be an additional tuning aid for large sweeping tracks. So on medium to smaller it might handle like a milkcrate?
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Old 05-05-2011, 12:01 PM
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Originally Posted by samuelsonmark71 View Post
I was planning on using it on the larger outdoor tracks built for 1/8th scale buggies and truggies. Right now I cant seem to keep the rear end locked down and was thinking this might help as well...
thats what i did with mine. i only used it on 1/8 size tracks. it was killer on the long straights and sweeping turns but on the tight stuff i'd have to use the brakes to kick it out. it also jumped flatter with it, needed less input to keep it flying right.

look up the jconcepts j82. it's a t4 based 1/9 scale buggy. pretty cool and awesome on the big tracks.

also the jconcepts j82 body is the only body that will fit a b4 with a t4 chassis.
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Old 05-05-2011, 12:08 PM
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Actually FTW bodies makes a body for the B4.1 XL that is kind of similar to the cab forward bodies.

http://www.avidrc.com/product/18/bod...es-by-ftw.html
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Old 05-05-2011, 12:13 PM
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thats new, and cool. last year when i had mine running the long chassis jconcepts was the only game in town.

you're gonna need the extra front downforce thats for sure.
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Old 05-05-2011, 12:16 PM
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I know that a few people just cut the sides of the body on the body to accommodate it (usually in the front). Id rather use the new Night Fox body personally, but its a cheaper option. I wonder if this set up would help in a woopy section at our local track... Its a tight small track but that section slows everyone down SOOO much that it would be worth it to be a little more stable and slugish else where
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Old 05-05-2011, 12:35 PM
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Originally Posted by samuelsonmark71 View Post
I know that a few people just cut the sides of the body on the body to accommodate it (usually in the front). Id rather use the new Night Fox body personally, but its a cheaper option. I wonder if this set up would help in a woopy section at our local track... Its a tight small track but that section slows everyone down SOOO much that it would be worth it to be a little more stable and slugish else where
i did find i was able to make it through washboards faster with it. it's like it skips along the tops better then the short car.

i sent you a pm.
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