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Old 08-04-2014, 09:08 PM   #1
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"Jump" ready

Have a 2011 jk sport and plan on prerunning. Some trails might give me a little air, maybe a foot or two. Just curious as to what I need done to be ready for it. My main plans are 2.5 inch RK flex kit with front and rear control arms, fox reservoirs, speed bumps, and an axle truss. Will also be running 35 MTRs.

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Old 08-04-2014, 09:30 PM   #2
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Better gusset your c's too.

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Old 08-04-2014, 09:47 PM   #3
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If catching air in your jeep, is the plan. Skip on the fake bumps and step up to airbumps. At a minimum C gusstes, in addition to the trusses. Otherwise you'll have a expensive D30 paperweight with lots of neg camber after the first good jump. Even then I'd be more than conservative with jumping on a D30.
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Old 08-05-2014, 07:00 AM   #4
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might want to look into some upgraded steering components and a sector shaft brace of some kind. your front end is going to take a beating....
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Old 08-05-2014, 07:46 AM   #5
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Coil overs
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Old 08-05-2014, 07:58 AM   #6
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Old 08-05-2014, 10:57 AM   #7
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I could see pre-running in a JKU, but the short wheelbase on a JK just doesn't seem like it would perform well.

If anything look in to the teraflex prerunner suspension kit. You'll also need some beefy res shocks, gusset the C's, truss kits on both axles, sleeves. Otherwise tow a spare Jeep because you'll be braking stuff left and right.
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Old 08-05-2014, 12:02 PM   #8
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Quote:
Originally Posted by Riccochet View Post
I could see pre-running in a JKU, but the short wheelbase on a JK just doesn't seem like it would perform well.

If anything look in to the teraflex prerunner suspension kit. You'll also need some beefy res shocks, gusset the C's, truss kits on both axles, sleeves. Otherwise tow a spare Jeep because you'll be braking stuff left and right.
a spare jeep might not be enough...
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Old 08-05-2014, 12:55 PM   #9
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A few inches of "air" may be OK if you beef it up as described above but for 2 ft you better be moving fast and even then something will likely break. Be happy with just driving fast on rough washboard trails.
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Old 08-05-2014, 01:36 PM   #10
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I used to play around jumping in my old CJs back in the day. (See avatar CJ7)
The number 1 thing you need is a fat wallet or bank account.
Jumping ain't nothing....It's the landing that's bad as they say.
The CJ in that picture, the whole frt end dropped on me on the way home. Shocks etc literally tore thru the fender wall supports. Had to tow it all the way home.
Wouldn't jump anymore. Beefing up your frt end and suspension just makes you want to try higher. Had a jeep come off crooked at last minute. Came down on passenger . side, front mostly. Went end over end catty-corner. Broke all kinds of stuff on the jeep and me too. Backs held together with screws and rods from that.
Sorry 'bout grainy pict but it's off an old polaroid
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Old 08-05-2014, 01:40 PM   #11
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Quote:
Originally Posted by Riccochet View Post
I could see pre-running in a JKU, but the short wheelbase on a JK just doesn't seem like it would perform well.
If anything look in to the teraflex prerunner suspension kit. You'll also need some beefy res shocks, gusset the C's, truss kits on both axles, sleeves. Otherwise tow a spare Jeep because you'll be braking stuff left and right
And not only on the jeep
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Old 08-05-2014, 02:05 PM   #12
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now THERE'S some MODS!!!!
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Old 08-05-2014, 03:29 PM   #13
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Talked me out of jumping...
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Old 08-05-2014, 11:32 PM   #14
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sell Jeep, get Raptor
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Old 08-05-2014, 11:44 PM   #15
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sell Jeep, get Raptor
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Old 08-05-2014, 11:55 PM   #16
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False
whaaaaaaaaattt??
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Old 08-06-2014, 12:00 AM   #17
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Pay to play:

07+ jeep jk 1.75 - 3" adjustable stage 3 coilover conversion system

Beef the axle then it's all fun.

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Old 08-06-2014, 12:02 AM   #18
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Coil overs
coilovers!!

for real though I have coilovers and would never consider jumping my 4200lb 2 door. It is not a good idea

even if you gusset the C's, you are going to bend the tube, crack the housing, destroy unit bearings, snap knuckles, bend the semifloating rear axleshafts, rip off stamped sheet metal link mounts... you may actually find every single weak link in the dana 30/44 all at once.

lets not forget the fact that the entire unit bearing is held on by 3 bolts
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Old 08-06-2014, 12:11 AM   #19
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Pay to play:

07+ jeep jk 1.75 - 3" adjustable stage 3 coilover conversion system

Beef the axle then it's all fun.

look at the poor spare tire on that thing
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Old 08-06-2014, 12:27 AM   #20
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First question.... Have you ever "pre run" a race course before?

2nd... Have you ever jumped a vehicle before?

My guess to both questions is NO... Cause you sure as hell wouldn't be doing it with a 2dr sport with a 2.5" lift.

Good luck!
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Old 08-06-2014, 01:46 AM   #21
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OK guys coil overs aren't going to do SQUAT for jumping...what a spring surrounding the shock is better than it sitting beside the shock???

If you don't have cash for coil overs and bypass then limiting straps so you don't throw a spring in a weird situation say shock,s are too long....hydraulic bumps to take up some of the hit....
I'd say long arms to make for a longer arch for compliance on bu PS but if your jumping and not ha,,wrong ruts then stock length will work...

Truss without a question sleeve to, definently sector shaft brace or hydro assist, c-gussets and ball joints...
Tie rod, pktman arm and drag link, beef up Tracbar brackets .....

This is a good start...

I used to run my off road race trucks, build em and do pre runners been around em since mid 90's
Have more airtime than Michael Jordan and racked up a slew of frequent flyer miles...

Jumping is fun breaking sucks remember the jeep is heavy so plan accordingly my old Toyotas were lightand my Chevy Silverado was built to haul @$$ and go fast in the desert....






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Old 08-06-2014, 04:21 AM   #22
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False
http://youtu.be/JKQdlXvbWSU
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Old 08-06-2014, 04:47 AM   #23
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everything they said ^ but if it were me id park my nice pretty JK and go buy an old Cherokee 4x4, strip it down, build it back up and add everything they said. No sense in ruining a perfectly good JK when all those Cherokees are sitting around with the longer wheel bases. Check out the everyman races. Theres a lot of them on there.
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Old 08-06-2014, 07:53 AM   #24
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Raptors are ok stock for playing around. Any serious running at speed still requires a lot of modification. Friend of mine in AZ has a highly modified Raptor to run Baja races in. He still breaks stuff even on small kickers.

The importance of a real, frame mounted, triangulated roll cage will never be more apparent until you need it. Also 5 point harnesses.
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Old 08-07-2014, 09:59 PM   #25
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I bought one of these to go fast in the desert. They're kind of pricey, but a lot less money than you're going to spend on repairing a Jeep if you're trying to go fast.

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Old 08-07-2014, 10:13 PM   #26
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One other thing I wanted to add that no one else has really touched on yet, is that the transfer case on a JK has a habit of busting the case when you make a front end landing. The shock load of landing on the front end comes right up through the driveshaft and splits the case on the transfer case. Impulse Off Road makes a steel exoskeleton cage like devise that goes around the stock transfer case, and prevents it from breaking. John Williams owns Impulse Off Road, and races a highly modified KOH JK and a stadium race truck at short course races. He had broke a number of stock transfer case housings, and a few Atlas housings, then sat down and figured out the exoskeleton cage thing, and built one for his race Jeep. A few races later he overshot a large table top jump at Miller Motorsports Park and landed his JK front end down, after the jump, on flat ground. The impact was hard enough that he blew one of his Teraflex long arm flex joints, and shattered the CV joint on his Tom Wood front driveshaft, but the transfer case survived. So the devise must work to some extent. I had John install one of his exoskeleton devises on my JK when he installed the axles and suspension. The devise doesn't show up well in pictures, but this is it. It is the black steel plate on the back side of the transfer case. It also goes around the top and side of the case, but you cant see it in the picture.

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Old 08-09-2014, 03:45 AM   #27
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Thx for the info. I'll check into that cage.
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Old 08-09-2014, 04:41 AM   #28
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I bought one of these to go fast in the desert. They're kind of pricey, but a lot less money than you're going to spend on repairing a Jeep if you're trying to go fast.

I saw a couple of side-by-sides tooling around on a trail between two rolling hills last year in Baja and they look like they are a blast. I was in a relatives lightly loaded JK doing about 30 MPH which was about the limit on his JK with highly tuned coilovers on this trail and at one point it seemed like the pair just hummed by us sipping coffee. The tires seemed small but the performance was not.
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Old 08-09-2014, 12:34 PM   #29
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I saw a couple of side-by-sides tooling around on a trail between two rolling hills last year in Baja and they look like they are a blast. I was in a relatives lightly loaded JK doing about 30 MPH which was about the limit on his JK with highly tuned coilovers on this trail and at one point it seemed like the pair just hummed by us sipping coffee. The tires seemed small but the performance was not.
you are absolutely correct. those suckers are quick.

at our clubs yearly 150+ rig event, we had 3 show up. they were mad because we couldnt give them their own class because all 3 of them would win prizes for sure. so we put them in the Extreme class, but they were just racing for fun. they walked all over the "king of the hill" and obstacle course races, and they walked all over a $100,000 ultra4 car as well.

side by sides have been getting big lately because they are cheap to buy, cheap to modify, easy for older folks to get in and out of, and you dont need a dedicated diesel tow rig to tow a few of them.
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Old 08-09-2014, 06:53 PM   #30
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One other thing I wanted to add that no one else has really touched on yet, is that the transfer case on a JK has a habit of busting the case when you make a front end landing. The shock load of landing on the front end comes right up through the driveshaft and splits the case on the transfer case. Impulse Off Road makes a steel exoskeleton cage like devise that goes around the stock transfer case, and prevents it from breaking. John Williams owns Impulse Off Road, and races a highly modified KOH JK and a stadium race truck at short course races. He had broke a number of stock transfer case housings, and a few Atlas housings, then sat down and figured out the exoskeleton cage thing, and built one for his race Jeep. A few races later he overshot a large table top jump at Miller Motorsports Park and landed his JK front end down, after the jump, on flat ground. The impact was hard enough that he blew one of his Teraflex long arm flex joints, and shattered the CV joint on his Tom Wood front driveshaft, but the transfer case survived. So the devise must work to some extent. I had John install one of his exoskeleton devises on my JK when he installed the axles and suspension. The devise doesn't show up well in pictures, but this is it. It is the black steel plate on the back side of the transfer case. It also goes around the top and side of the case, but you cant see it in the picture.
I saw this today (pic)
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