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 1Likes
07-20-2016, 11:54 AM
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CC Member
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Join Date: Jun 2006
Location: wellington,
oh
Cobra Make, Engine: BDR #260 w/ 347 stroker, Canfield 195 cc heads, prosystems carb on a VicJr, Comp roller cam
Posts: 221
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Not Ranked
Quote:
Originally Posted by Grey 65
The entire suspension is without rubber or poly as I want to eliminate as much deflection as possible. This makes the handling much more predictable and allows me to pull higher G's... We pull around 1.3 G's when turning and around 1 G accelerating and braking. And we change directions a lot. An autocross is basically a road course without the straits....
The poly diff mounts are there as I want a weee little bit of deflection there so as to slow down the shock load transfer to the ground under load and back to the diff when you release the load.
Kevin....
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tried the autocrossing in my BDR, I need p/s and a quicker ration rack for me to do it. Nice numbers on the "G" forces! and thanks for the Poly diff mount explaination.
Bill
__________________
BDR#260...21.6K miles logged as of 4/2018 
www.motorheadsohio.com We are an engine machine shop, specializing in crankshafts!
47 years of doing business an going strong! stop on by for a personal tour of the shop
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07-20-2016, 12:31 PM
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CC Member
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Join Date: Aug 2013
Location: Haslet,
TX
Cobra Make, Engine: BDR #888, Keith Craft 408
Posts: 344
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Not Ranked
Quote:
Originally Posted by tamanaco
tried the autocrossing in my BDR, I need p/s and a quicker ration rack for me to do it. Nice numbers on the "G" forces! and thanks for the Poly diff mount explaination.
Bill
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Backdrafts P/S rack is quick.. But I bought a true BMW Z3 rack and installed it.
It is a little quicker and I went with a KRC pump as you can change the valving for more feedback....
Backdrafts rack is an aftermarket unit.. They do NOT know the true ratio... somewhere between 2.7 and 3.2....
The BMW Z3 rack is 2.7....
Kevin.... |
07-27-2016, 08:14 PM
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CC Member
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Join Date: Jun 2006
Location: wellington,
oh
Cobra Make, Engine: BDR #260 w/ 347 stroker, Canfield 195 cc heads, prosystems carb on a VicJr, Comp roller cam
Posts: 221
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Not Ranked
Finally got the car into the garage for al look today. Looks like the half shaft broke at the diff C/V joint. So, my question is what half shaft to buy? 
__________________
BDR#260...21.6K miles logged as of 4/2018
www.motorheadsohio.com We are an engine machine shop, specializing in crankshafts!
47 years of doing business an going strong! stop on by for a personal tour of the shop
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07-27-2016, 09:33 PM
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CC Member
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Join Date: Aug 2013
Location: Haslet,
TX
Cobra Make, Engine: BDR #888, Keith Craft 408
Posts: 344
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Not Ranked
Quote:
Originally Posted by tamanaco
Finally got the car into the garage for al look today. Looks like the half shaft broke at the diff C/V joint. So, my question is what half shaft to buy? |
I run 315/30/18 BFG Rival S tires on my car and in 3 years of autocrossing I've snapped one axle.. the R/H side one and I did it in Scottsdale this past March. I just replaced it with another BDR unit as since I only snapped one in 3 years I figured the BDR units are good enough. Brian at BDR told me some people (drag racers) have special half shafts made by "The Driveshaft Shop" in Salisbury, NC.... The cost was really high and since I didn't think I'd snap another one I passed on the custom built unit...
Kevin |
07-27-2016, 09:38 PM
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CC Member
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Join Date: Dec 2010
Location: Tempe,AZ-High Point,NC,
AZ
Cobra Make, Engine: Kirkham #684, 482FE, Mike Mccluskey build
Posts: 2,520
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Not Ranked
Don't you have a BMW m3 suspension. Buy BMW
__________________
PRIDEnJOY
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07-28-2016, 04:46 AM
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Backdraft Racing Dealer
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Join Date: Dec 2004
Location: North Haven,
CT
Cobra Make, Engine: Backdraft Racing
Posts: 5,115
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Not Ranked
Quote:
Originally Posted by tamanaco
Finally got the car into the garage for al look today. Looks like the half shaft broke at the diff C/V joint. So, my question is what half shaft to buy? |
You have an early car so the shafts are standard bmw units and not the aftermarket designs used the last 6 years or so. If you are going to drag the car with real tires you should consider shafts from https://www.driveshaftshop.com
The best method is to send them yours so they can build what you need exactly.
The wait is long though...
You can buy nice replacements at NAPA to run in the meantime. |
01-24-2017, 01:37 PM
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CC Member
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Join Date: Oct 2003
Location: Miami,
FL
Cobra Make, Engine: Backdraft #272, 351W
Posts: 163
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Not Ranked
Quote:
Originally Posted by Grey 65
Backdrafts P/S rack is quick.. But I bought a true BMW Z3 rack and installed it.
It is a little quicker and I went with a KRC pump as you can change the valving for more feedback....
Backdrafts rack is an aftermarket unit.. They do NOT know the true ratio... somewhere between 2.7 and 3.2....
The BMW Z3 rack is 2.7....
Kevin....
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What mods to install the Z3? |
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