BMI's DB12R

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Old 01-12-2009, 03:28 PM
  #6766  
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Originally Posted by tellan View Post
Just completed the build 2 hours 40 mins and another 2 hours kit it out.What do you think guys.

BMI 12RR If it goes as well as it looks watch out.

Wow thats a fast build! took me 2 nights. 1 night to just build the front end and sand/CA the chassis, and the second night to get electronics on it and get it running.
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Old 01-12-2009, 03:38 PM
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Originally Posted by fatbear View Post
Jason, (or anyone for that matter) can you please explain what changing the front droop does for the cars handling.
ie; changing from 3 shims to 2 shims above the upper pivot ball.

Is there an optimum difference in tire dia from front to rear? Perhaps a ratio you can use like the rear tires are for example should be 1.05 times bigger than the fronts.
Droop in the front makes the car a little more predictable. This is at the expense of a slight bit of on power steering. With no droop, the car will feel very direct and almost feel like it wanders a little. Some guys like that. I prefer to have the car a little more predictable.

I usually always run a .100 split. The .100 difference from front to rear just gives me the feel i am looking for. When i run a .050 split, I feel the car has spongy feel. The .100 works well for me. I have seen many variances is preffered split.
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Old 01-12-2009, 03:38 PM
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Originally Posted by tellan View Post
Just completed the build 2 hours 40 mins and another 2 hours kit it out.What do you think guys.

BMI 12RR If it goes as well as it looks watch out.
Very cool buddy. Let us know how it goes.
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Old 01-12-2009, 04:53 PM
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Originally Posted by protc3 View Post
Droop in the front makes the car a little more predictable. This is at the expense of a slight bit of on power steering. With no droop, the car will feel very direct and almost feel like it wanders a little. Some guys like that. I prefer to have the car a little more predictable.

I usually always run a .100 split. The .100 difference from front to rear just gives me the feel i am looking for. When i run a .050 split, I feel the car has spongy feel. The .100 works well for me. I have seen many variances is preffered split.

Thanks Jason,
one more thing. On the weekend I was getting a little bit of double steer on the car. We were running outdoors on Ashfelt. What would I do to correct this without sacrifising any rear grip?
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Old 01-12-2009, 05:14 PM
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Hey Jason, did the cf arrive?
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Old 01-12-2009, 06:37 PM
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Originally Posted by fatbear View Post
Thanks Jason,
one more thing. On the weekend I was getting a little bit of double steer on the car. We were running outdoors on Ashfelt. What would I do to correct this without sacrifising any rear grip?
Try running the flex plate in the short mounting position
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Old 01-12-2009, 06:37 PM
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Originally Posted by Randy Caster View Post
Hey Jason, did the cf arrive?
I called them today and it should be at my shop on wednesday.
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Old 01-12-2009, 09:44 PM
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Originally Posted by protc3 View Post
I called them today and it should be at my shop on wednesday.
Sweeet
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Old 01-12-2009, 11:20 PM
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Mahalo's BMI I got my 78t spurs and a pinion in today

Already got the spur mounted on the car!

Can't wait for Sunday!
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Old 01-13-2009, 12:55 AM
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I found what the problem was with the motor moving. I had a bent pod plate (the one where the motor mounts)

I've changed it over now, so hopefully that's the end of the problems
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Old 01-13-2009, 01:19 AM
  #6776  
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how can you bend THAT?
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Old 01-13-2009, 02:22 AM
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Originally Posted by Uga View Post
how can you bend THAT?

came out of a sweeper too wide and bounced off a wall a long time ago. I bent the pod plate back as best I could and had meant to replace it. I forgot to actually change it over though !
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Old 01-13-2009, 06:02 AM
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Can someone tell me the difference, if any, between jaco yellow rears and pink rears, they have the same shore rating but I wasn't sure if there was a difference. I heard the pinks just don't chunck as easy.
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Old 01-13-2009, 06:12 AM
  #6779  
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Here is the answer:
http://bmiracing.com/bmiv4/index.php...d=15&Itemid=30
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Old 01-14-2009, 10:41 AM
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That's definitely a useful guide, I was honestly pretty clueless as to what all the foam compounds are, just been running what everyone's been telling me to run, lol.
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