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 1Likes
07-17-2016, 03:44 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
street tire launch at a sticky drag strip
OK...just broke something in the diff or half shaft on my #260 BDR car. 3.91 gears posi diff, 295 50 15 cooper cobra tires, 3000 rpm launch, on a T5WC trans. getten wheel hop, like 3 to 4 chirps before it hooks, 1.8XX 60 foot times. Got the Bilstien shock and standard BMW rubber in the rest of the car. Wheel hop did seem real bad...but it broke. 390 rwhp on a 347 cid stroker. What will fix the wheel hop? BTW...11.970 @ 117.4 MPH
also shifting to second...no hop just tire spin! ditto 3rd
__________________
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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07-17-2016, 03:47 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
Cooper tire. Seriously. Try a real tire. Those are the same tires I use on my work van.
__________________
PRIDEnJOY
Last edited by fordracing65; 07-17-2016 at 03:49 PM..
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07-17-2016, 07:18 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
Quote:
Originally Posted by fordracing65
cooper tire. Seriously. Try a real tire. Those are the same tires i use on my work van.
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Really...
__________________
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
Last edited by tamanaco; 07-17-2016 at 07:21 PM..
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07-17-2016, 07:52 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
Quote:
Originally Posted by tamanaco
Really...
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Ya. Really. Your tires have an 85 mph speed rating.
__________________
PRIDEnJOY
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07-17-2016, 07:53 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
Actually 112 mph speed rating.
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PRIDEnJOY
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07-17-2016, 07:59 PM
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CC Member
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Join Date: Dec 2015
Posts: 1,442
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Not Ranked
One of my to-do list of things on my car...
Since I have a very early Serial# and questionable age and source of components when built.
Even if was a new suspension during the build the bushings are all soft rubber for a family sedan.
Personally I won't go so far as needle bearings or Beryllium Copper bushings since I'm not a racer.
BMW E36 Performance Suspension Components
Active Autowerke E36 BMW Differential Support Bracket (DSB) - $265.00 | Active Autowerke
So whats happening when the hop occurs take a look at this 2015 Mustang video. The principles are the same.
The fore-aft motion of the wheel causes the breakaway. But the other areas (Diff) are all over the place as well.
[ame]https://www.youtube.com/watch?v=91kQSQ8NHME[/ame]
IRS cars typically suck at the strip. |
07-18-2016, 05:27 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
spdbrake...thanks for the links. I have found that the CC forum folks to be helpful.
Yep, I know IRS car suck for launches in 1/4 mile stuff.
I see the BackDraft Boys have solid mount for the subframe and the third member.... http://www.backdraftparts.com/produc...-bushings.html
Turner Motor sports has solid on the diff ears, delrin on the nose... https://www.turnermotorsport.com/p-3...36-m3/?pdk=AgE I like that configuration.
__________________
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
Last edited by tamanaco; 07-18-2016 at 07:24 AM..
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07-18-2016, 07:14 AM
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Stolen Avitar
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Join Date: Oct 2004
Location: Brunswick,
GA
Cobra Make, Engine: BDR 1311 428PI
Posts: 3,044
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Not Ranked
Quote:
Originally Posted by tamanaco
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I used them in both of my big block cars, used sticky road race rubber and never had a problem. The car would just squat and launch. So yes, if you still have all the rubber in your rear suspension, I would get rid of it when I fixed whatever broke. I used these as well: http://www.backdraftparts.com/produc...mountings.html |
07-18-2016, 07:30 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
Lovehamr...what do you use on the trailing arms...solid, delrin or urethane?
__________________
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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07-18-2016, 07:37 AM
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Stolen Avitar
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Join Date: Oct 2004
Location: Brunswick,
GA
Cobra Make, Engine: BDR 1311 428PI
Posts: 3,044
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Not Ranked
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07-18-2016, 01:09 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
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07-18-2016, 02:04 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
Those bmw parts have to be pricey as hell.
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PRIDEnJOY
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07-18-2016, 05:02 PM
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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 fordracing65
Those bmw parts have to be pricey as hell.
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Not really. And since there are a ton of companies making aftermarket parts for the suspension design there are many options and some price competition. A lot better than a custom suspension with only a supply chain though the manufacturer of the car. |
07-18-2016, 05:33 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
I guess if you don't buy oem BMW parts you can save a little.
__________________
PRIDEnJOY
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07-19-2016, 04:47 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
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Nice list of parts! Thanks!
Do have a questions. all are solid mounts, except the diff mounting is Poly...the reason you selected this poly mounts for the diff is?
Thanks, 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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07-19-2016, 09:40 AM
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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
Nice list of parts! Thanks!
Do have a questions. all are solid mounts, except the diff mounting is Poly...the reason you selected this poly mounts for the diff is?
Thanks, Bill...
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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....
Last edited by Grey 65; 07-19-2016 at 03:49 PM..
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07-19-2016, 02:41 PM
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CC Member
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Join Date: Sep 2014
Location: Colorado Springs,
CO
Cobra Make, Engine: ERA 427 S/C, Ford 427 Side-oiler 2x4 bbl
Posts: 66
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Not Ranked
Quote:
Originally Posted by fordracing65
Actually 112 mph speed rating.
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Which Cooper tires do you have?
I have the Cooper Cobra tires on mine and I could swear I looked it up and came up with mid-90 (95? 98??) mph ratings.
But I could be wrong and besides, I'm not *too* worried about taking a 95mph rated tire to 110-115mph for a short time. Sustained might worry me.
Phill |
07-19-2016, 08:31 PM
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CC Member
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Join Date: Feb 2014
Location: White City,
SK
Cobra Make, Engine: West Coast, 460 CID
Posts: 2,852
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Not Ranked
Quote:
Originally Posted by Phill Pollard
Which Cooper tires do you have?
I have the Cooper Cobra tires on mine and I could swear I looked it up and came up with mid-90 (95? 98??) mph ratings.
But I could be wrong and besides, I'm not *too* worried about taking a 95mph rated tire to 110-115mph for a short time. Sustained might worry me.
Phill
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Cooper Cobra tires are T speed rated (118 mph / 190 km/h), except for P295/50R15 which is S speed rated (112 mph / 180 km/h).
Cooper COBRA RADIAL G-T Tire Reviews (2 Reviews)
Tires Speed Rating | 1010Tires.com Discount Online Tire Store
__________________
Brian
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07-19-2016, 08:34 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
Those tires will probably last 60,000 miles.
__________________
PRIDEnJOY
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07-20-2016, 11:47 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
Mine are Cooper Cobra Radial G/T 295 50 15's
__________________
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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