Racing in 4X4?
Racing in 4X4?
Freshman User
Joined: Feb 2002
Posts: 40
Likes: 0
Racing in 4X4?
I dont suppose any of you have thought of or tried using 4 wheel drive to get a good launch on pavement? it wouldnt really benefit me right now, but i hope to cut some weight (less traction), build the engine a bit more, and possibly even give it a healthy shot of nitrous. How awsome would that be to put down 600-700hp to all 4 wheels and not slip a bit? 
i know turning would be a no-no, but what about just a quick straight 1/8th or so mile run? so i guess the question is, would the transfer case hold up to that kind of power, and more importantly, that kind of power on pavement?
i know turning would be a no-no, but what about just a quick straight 1/8th or so mile run? so i guess the question is, would the transfer case hold up to that kind of power, and more importantly, that kind of power on pavement?
Senior User
Joined: Sep 2001
Posts: 210
Likes: 2
From: Lincoln, Rhode Island
Racing in 4X4?
Sounds like fun!! In terms of drivetrain a straight run shouldn't damage the 4 wheel running gear but the t-case, hubs, and u-joints that is hard to say. The t-case will depend on which case your truck has, The hubs will definitely have to be heavier than stock and so will the u-joints. If I were you I would make the hubs the weak point of the system so they will grenade first before breaking anything else since they are cheap(comparitively) and easy to replace.
Go for it!!
400m
Go for it!!
400m
Freshman User
Joined: Feb 2002
Posts: 40
Likes: 0
Racing in 4X4?
thats an excellent idea about the hubs! ill keep that in mind if i end up going through with it. i actually dont even know for sure what my tcase is, ive never really looked into it. its an 83 f250...if memory serves me the np208 and a borg warner something or other were both options back then. which one would be the stronger case? and would the hubs generally go before it would? thanks a lot.
ill keep that in mind if i end up going through with it. i actually dont even know for sure what my tcase is, ive never really looked into it. its an 83 f250...if memory serves me the np208 and a borg warner something or other were both options back then. which one would be the stronger case? and would the hubs generally go before it would? thanks a lot.
Freshman User
Joined: Jan 2002
Posts: 32
Likes: 0
Racing in 4X4?
>I dont suppose any of you have thought of or tried using 4
>wheel drive to get a good launch on pavement? it wouldnt
>really benefit me right now, but i hope to cut some weight
>(less traction), build the engine a bit more, and possibly
>even give it a healthy shot of nitrous. How awsome would
>that be to put down 600-700hp to all 4 wheels and not slip a
>bit? i know turning would be a no-no, but what about just
>a quick straight 1/8th or so mile run? so i guess the
>question is, would the transfer case hold up to that kind of
>power, and more importantly, that kind of power on pavement?
>
I once had a 77 CH%$#@ 4x4 with a 396 in it wityh a holly 850 double pumper
the truck was fast and I could light up all four easly. Yes I got a good launch and would beat a lot of cars. But my transfer case Np203 did not hold up along wiht front ujionts and a drive shaft clutch . Yes It can be done but WHY ?
>wheel drive to get a good launch on pavement? it wouldnt
>really benefit me right now, but i hope to cut some weight
>(less traction), build the engine a bit more, and possibly
>even give it a healthy shot of nitrous. How awsome would
>that be to put down 600-700hp to all 4 wheels and not slip a
>bit?
i know turning would be a no-no, but what about just >a quick straight 1/8th or so mile run? so i guess the
>question is, would the transfer case hold up to that kind of
>power, and more importantly, that kind of power on pavement?
>
I once had a 77 CH%$#@ 4x4 with a 396 in it wityh a holly 850 double pumper
the truck was fast and I could light up all four easly. Yes I got a good launch and would beat a lot of cars. But my transfer case Np203 did not hold up along wiht front ujionts and a drive shaft clutch . Yes It can be done but WHY ?
Postmaster
Joined: Jul 2001
Posts: 4,038
Likes: 3
From: South Kitsap County, WA
Racing in 4X4?
The idea is cool, but the results probably won't be.
The transfer case is designed to only be run on a semi slick surface. The fulltime units are set up differently than the part time transfer cases you're looking at. The newer ones in the modern day full time 4 wheel drive use a viscous clutch system which will give you the play required incase you get wheel spin and sudden grip. The NP208 and the BW1345 were specifically designed for slippery, slow moving conditions. They have no room for slack or sudden snapping actions that a 4 wheel burnout might create.
Something else along those line is the front and rear gear ratios have to perfectly matched for less potential wear in the transfer case. Quite a few trucks came off the assembly line with slightly different gear ratios front and back.
I am not saying it can't be done, just not with the stock parts.
-Kerry
The transfer case is designed to only be run on a semi slick surface. The fulltime units are set up differently than the part time transfer cases you're looking at. The newer ones in the modern day full time 4 wheel drive use a viscous clutch system which will give you the play required incase you get wheel spin and sudden grip. The NP208 and the BW1345 were specifically designed for slippery, slow moving conditions. They have no room for slack or sudden snapping actions that a 4 wheel burnout might create.
Something else along those line is the front and rear gear ratios have to perfectly matched for less potential wear in the transfer case. Quite a few trucks came off the assembly line with slightly different gear ratios front and back.
I am not saying it can't be done, just not with the stock parts.
-Kerry
