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Old 12-22-2008, 12:33 PM   #6511
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Originally Posted by InspGadgt View Post
Taping the holes definately helps...I am guessing the BMI aluminum spacers also helps...they fit much tighter to the screw so I think they reduce the arm movement in impacts. I noticed in my old Darkside car with the plastic spacers I was cracking arms too...but when I switched to the BMI car with the BMI aluminum spacers it stopped happening.
I think the aluminium spacers are spot on greatly reduce the risk of bending the screws, it is still a weak point though but I have found that using the IRS .060 lowered arms are also good. Some mentioned earlier about using steel or titanium screws, I was advised that the alloy screws although a weak point act as a stress factor in a hit and save a lot more potentially expensive damage, so, I have stayed with the alloy ones to be safe. Best advise of all though, dont hit anything
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Old 12-22-2008, 01:06 PM   #6512
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Terry,
Replied to your queris on racechat.

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Old 12-22-2008, 01:23 PM   #6513
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I raced my car on Friday night and it performed better than it had ever done before, the difference between fastest and average laps was about 4/10th sec and the car was very easy to drive consistently . I had previoulsy been using a setup more suited I think to a high traction surface, but we run on Prima Felt GT with a low to medium level of traction. Here's the setup I used.

Front
5deg blocks, 6deg static castor, 1.5 deg negative camber
Silicone lube on kingpins (it dries fully so nothing sticks)
1 deg toe out
Jaco 2x pink, 80% additive, 42 mm dia
4mm ride height, servo up, AE 0.020" springs

Rear
5000wt oil in side dampers, forward position on pod plate
Gold spring, 30wt oil in centre shock, 1mm spacer under forward ball stud (HB Shock)
Thin L plates, stock roll centres on all three balls
Batteries fully back
Jaco Yellow, full width additive, 44.5 mm diameter
4mm ride height, pod level, 1.5 mm droop

Nosram Matrix Evo 07 (2,4,0,0) Hacker 10.5 motor.
PF Speed 12 shell

This setup (for me) was awesome, but now I have just received my 'RR' conversion, any ideas on what, if any changes I should make to the setup.

And, what is the shock lenght needed to get 1.5mm of pod droop on the RR?

Jason, this car just gets better and better, keep up the good work
Im glad to see the car working well for you buddy. Thanks for the kind words.
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Old 12-23-2008, 05:43 AM   #6514
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All the new BMI Big Wheel pinions 45T-60T are online and for sale now.

www.bmiracing.com
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Old 12-23-2008, 05:57 PM   #6515
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Quote:
Originally Posted by terryh View Post
I think the aluminium spacers are spot on greatly reduce the risk of bending the screws, it is still a weak point though but I have found that using the IRS .060 lowered arms are also good. Some mentioned earlier about using steel or titanium screws, I was advised that the alloy screws although a weak point act as a stress factor in a hit and save a lot more potentially expensive damage, so, I have stayed with the alloy ones to be safe. Best advise of all though, dont hit anything
I actually had a discussion with Dave Irrgang about using the titanium screws in the IRS brand front arms. He explained the ti screws are slightly larger in diameter than the aluminum screws. This increases the chance of cracking the front arm, especially the front screw hole where the material is thinner.

While I'm posting, any suggestions as to what kinda setup changes to try when the traction starts to come up?
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Old 12-23-2008, 06:08 PM   #6516
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Quote:
Originally Posted by SpraydbySprague View Post
I actually had a discussion with Dave Irrgang about using the titanium screws in the IRS brand front arms. He explained the ti screws are slightly larger in diameter than the aluminum screws. This increases the chance of cracking the front arm, especially the front screw hole where the material is thinner.

While I'm posting, any suggestions as to what kinda setup changes to try when the traction starts to come up?
Less reactive castor, glue tires, widen the front end, narrow the rear.
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Old 12-23-2008, 07:23 PM   #6517
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merry xmas and happy holidays to the entire bmi family
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Old 12-24-2008, 02:23 PM   #6518
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Like to wish the BMI Crew and The Team A very Merry Christmas and a Happy New Year
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Old 12-24-2008, 02:45 PM   #6519
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Have a very Merry Christmas to all of you. I hope everyone has a safe and happy one.
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Old 12-25-2008, 04:05 PM   #6520
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anyone know a good place to get a db12?
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Old 12-25-2008, 04:16 PM   #6521
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You can get them from BMI's website at www.bmiracing.com
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Old 12-25-2008, 06:35 PM   #6522
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finally i got my db12rr conversion kit!!! i love xmas
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Old 12-26-2008, 04:39 AM   #6523
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Man, im tired. Im glad everyone had a nice christmas.
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Old 12-26-2008, 09:11 AM   #6524
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Hey Guys,

For some reason i am having difficulty receiving emails at jason@bmiracing.com. If possible, please send all emails to bmachine@tampabay.rr.com with any technical info requests or questions.

Thanks and have a great weekend.
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Old 12-27-2008, 10:48 AM   #6525
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So I want to lighten up my car a bit, I want to get aluminium screw set, so which one would fit best for the DB12RR - AE or CRC? Or maybe is there a better option than those 2?
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