|
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 |
Cooper tire. Seriously. Try a real tire. Those are the same tires I use on my work van.
|
Quote:
|
Quote:
|
Actually 112 mph speed rating.
|
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. |
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. |
Quote:
|
Lovehamr...what do you use on the trailing arms...solid, delrin or urethane?
|
The spherical bearing. Backdraft Parts - Trailing Arm sperical bushings - Rear Suspension - Suspension - Products
|
The rear of my Pro Class Autocross car has the following installed along with JRi custom valved double adjustable shocks.
Rear Adjustable Camber Arms Rear Outer Upper AND Lower Trailing Arm Ball Joint Rear Trailing Arm Bushings (RTAB) - Turner Monoball Race Rear Subframe Bushings/Mount Set - Turner Solid Race Rear Control Arm Upper Inner Bushing - Turner Race Monoball Differential Mount Bushing Set, Poly 75D 14mm Front Bolt Kevin... |
Those bmw parts have to be pricey as hell.
|
Quote:
|
I guess if you don't buy oem BMW parts you can save a little.
|
Quote:
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... |
Quote:
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.... |
Quote:
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 |
Quote:
Cooper COBRA RADIAL G-T Tire Reviews (2 Reviews) Tires Speed Rating | 1010Tires.com Discount Online Tire Store |
Those tires will probably last 60,000 miles.
|
Mine are Cooper Cobra Radial G/T 295 50 15's
|
| All times are GMT -7. The time now is 07:14 AM. |
Powered by vBulletin® Version 3.8.0
Copyright ©2000 - 2025, Jelsoft Enterprises Ltd.
Search Engine Friendly URLs by vBSEO 3.6.0
The representations expressed are the representations and opinions of the clubcobra.com forum members and do not necessarily reflect the opinions and viewpoints of the site owners, moderators, Shelby American, any other replica manufacturer, Ford Motor Company. This website has been planned and developed by clubcobra.com and its forum members and should not be construed as being endorsed by Ford Motor Company, or Shelby American or any other manufacturer unless expressly noted by that entity. "Cobra" and the Cobra logo are registered trademarks for Ford Motor Co., Inc. clubcobra.com forum members agree not to post any copyrighted material unless the copyrighted material is owned by you. Although we do not and cannot review the messages posted and are not responsible for the content of any of these messages, we reserve the right to delete any message for any reason whatsoever. You remain solely responsible for the content of your messages, and you agree to indemnify and hold us harmless with respect to any claim based upon transmission of your message(s). Thank you for visiting clubcobra.com. For full policy documentation refer to the following link: