Competition Slicks or 4x4 launch.

[KLockliear]

Originally posted by Jff24Gordn

I launched very hard in 4x4 and wold spin my 285/75R16D through 2nd into 3rd gear.

Ok, technicality... I meant with an auto, driven as it should be (yes, you probably COULD get it to spin all 4 if you tried to leave too hard).

 

[Mopar-muscle]

Originally posted by JTroiano

I could also put some skinny tires on the front and wider on the back with the same diameter and launch in for wheel drive and this would alow the front to spin and the back to take the brunt of the load.

i'm surprised no one saw this , front to slip and the rear take the brunt of the load ??? if the front slips , and the rears don't then something has or is about to break . when you go in 4WHL the front and rear is locked together inside the Tcase . this is why both axles must have the same gearing and the same tire size .



how fast are you going thru the traps ? when i launch , only 412hp rear wheel(for the moment) , as soon as i am roughly 60 ft out i pop the Tcase out of 4wd , the front sliding collar is still locked , but aleast i'm not going 91mph plus in 4wheel drive .



it is probably a little harder for you having a stick to do this ... put on a shorter tire , LT265 or LT285 and launch in 4Hi

 

[HVAC]

Yup!

Good point Muscle, all the wheels should be spinning at the same rpm.



It seems to me that even distribution of power would be the easiest on the drivetrain. If anybody is going to break something, it's going to be me. All that torque focused into one axle is a good reasono to keep the D80

 

[big jake 1]

Re: Yup!

Originally posted by HVAC

Good point Muscle, all the wheels should be spinning at the same rpm.



It seems to me that even distribution of power would be the easiest on the drivetrain. If anybody is going to break something, it's going to be me. All that torque focused into one axle is a good reasono to keep the D80

either that or get a big bad 6. 9 4X4



Oo. Oo. Oo. :--) :--) :--)











big jake

 

[JTroiano]

Ya I guess the front won't spin if the back aren't. oops! I can't figure out how to say that if you have less traction in the front it won't actually spin more than the rear but it should allow the rear to spin a little and the front would sorta be dragging the truck or it would be the other way around. I can't quit figure how to say it but maybe someone else can explain it better. I think this has been done in tractor pulls. I used to drive a back hoe that was a 4x4 and it sorta worked the way I'm trying to explain it. I do think that the front drive line is weaker than the rear. A viscous coupler in the front drive shaft would be the best but that is pretty spendy.

 

[Mopar-muscle]

jt , you really can't think and apply what happens at a sled pull , or especially a back hoe as they have different size tires , that has to have some real odd setup . the pulls are run on dirt , loose surface and all the tires are breaking traction , the reason , me thinks, the rear bites more is the tongue weigth of the sled and it just gets heavier as you go .



drag strips are prepped so you have better traction , as witnessed in in the case of the guy that broke his input shaft and ruined his clutch with to hard a launch ...

 

[HoleshotHolset]

4x4 tractors/backhoe's with different sized tires have different ring 'n pinions front and rear to compensate for the tires.



Matt

 

[cmonroe]

Even in 4 wheel drive you can launch perfect with a five speed and break them loose on the shifts into 3rd or 4th. They dont spin for long so you dont think your loosing much time, however at the Southern Mopar Nationals last year they treated the track for my last run and with no spinning at all I broke out with . 15 faster on that run.