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Old 03-28-2007, 07:50 PM   #1
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Default b4 to nose heavy ?

Does anyone have some advice on how i can get my B4 to quit nose diving?i can jump it great but some times it takes a nose dive . I shouldnt have to stay on the throttle to much should i ? my be if i backed off my drag brake ? i just dont know .
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Old 03-28-2007, 08:33 PM   #2
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Try raising your rear ride height so that the dogbones (or cvd's) are above level. What could be happening is that as you approach the jump, the chassis is slapping the ground and bucking the rear end up in the air.
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Old 03-28-2007, 08:33 PM   #3
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I would say back off the drag brake then try it. If it is still, then try a quarter turn on the front shocks to add tension. At most 2 qtrs. Anything more then that will change handling.
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Old 03-28-2007, 08:37 PM   #4
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What is your current setup?
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Old 03-28-2007, 08:39 PM   #5
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You need 2- 1/4 oz weights behind the transmision. Use shoo gue or something to keep them in place.
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Old 03-28-2007, 08:51 PM   #6
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Its only on one Jump , a huge table top. i guess it takes the rest of em pretty consistant
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Old 03-28-2007, 09:17 PM   #7
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If it is a table top then you want it to nose dive back down onto the back side so that you can get the power back onto the ground! Where are you hitting the nose? Into the top of the table top or into the flat ground after the table top? This could just be a timing issue.
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Old 03-28-2007, 09:33 PM   #8
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in front of the tranny and behind the shock tower there is a space there. you can fit 2 oz. of weight in there if you scrap the sticky stuff off of them. and they fit very tight and no shoo goo is needed. then in the small triangle shape area at the rear of the chassis you put a 1/2 oz in each one of those. use the sticky stuff there to stick them in. then you'll be good.
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Old 03-28-2007, 09:35 PM   #9
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I would try and to stiffen the front end up with some shock adjustment or the piston and oil weight combo. I would add an oz of weight in front of the transmission also it just seems to help the car overall.
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Old 03-29-2007, 06:48 AM   #10
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Before you start adding weight and messing up the balance on your B4, make sure you are at proper ride height front and rear.

If you are still getting nose forward attitude, consider where this is happening. If it is happening immediately coming off the jump, that means your rear is too stiff compared to the front. So either go softer on the rear or go stiffer on the front. If it is happening mid flight, then it is drag brake or brake.

Another way to think about it is like this. Lets say you had two basketballs, one filled at 45psi and one filled at 65psi. The 65psi ball is harder and would relate to the rear of your car. The 45psi ball is softer and would relate to the front of your car. If you dropped both at the same time, the rear would bounce higher and require too much throttle to get neutral attitude.
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Old 03-29-2007, 08:49 AM   #11
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Eh, almost every pro driver adds weight to the rear of the B4, like described earlier (4 infront of the tranny, 2 each side in the triangle) It's fairly standard for B4s. It really helps to settle the car, also gives you a bit more rear bite.

Other thing people haven't asked. Are you doing a tail slap when you launch off the jump? This happens on some jumps with a steep incline, and when your bottom hits the face of the jump it puts you nose down. If that's happening change the approach of your jump, (normally by letting off the throttle as you approach the jump some, then punching it just before the face.)

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Old 03-29-2007, 10:45 AM   #12
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Throttle control.

short burst of throttle while jumping raises the nose

brakes lowers the nose

practice this and you will be jumping like the pro's
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Old 03-29-2007, 03:18 PM   #13
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Thank you everyone for your suggestions , the car starts to nose dive mid jump so the drag brake will turned down a notch and i will ad some wieght!
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Old 03-30-2007, 06:26 AM   #14
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We have a couple pros that come to our track during the big races and I don't remember seeing any added weight on their B4s. It is true though, if you add weight to the rear it will settle the buggy. I think you would be better off gaining rear bite by using the proper tires and spring ratios.
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Old 03-30-2007, 07:31 AM   #15
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I have had the chance to race one with the weight added to the rear like describe above and thought that it had a good balance of steering and traction. I say try it and remove weight till it drives like you want it too.
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