How much power can it handle?

[Narnian]

A buddy of mine has a 10.5 second Camaro he built. He told me that he eventually had to put in some kind of Ford rearend becuase he kept shredding the stock differential, and that he thinks he's going to have to buy an aftermarket tranny as well.

Mind you, I have no plans on turning my Cherokee into a drag car - it will always be meant for mud. But some day (like, after I wear the motor out) I would like to make it run 0-60 in 6 seconds or less, which would require a lot of power since the thing weighs so durned much and has the aerodynamics of a barn. Not to mention I'd like it to turn the 33's to that tune.

I'm just curious. How much power can the drivetrain handle without turning the Quadratrack into bits-on-the-track?

Yes, I have LM002 envy.

[Bob Barry]

If properly maintained, 400hp (a guess).

[Ralph]

Sheeeooooot! Now we're talkin'!

Start with this, and I'll be right over there to help with the build-up:

eBay Motors #599791752 (http://cgi.ebay.com/ebaymotors/aw-cgi/eBayISAPI.dll?ViewItem&item=599791752)

[NYC]

The tough part about this is an unknown factor: How hard you are on your Jeep.

I had a CJ-5 with a built 360 (340hp). I ran the stock (but rebuilt) T-150 3-speed, Model-20 transfer-case and the original Dana-20 rearend with the 'weak' 2-piece axles. I also had new 35" Boggers. The Jeep was wheeled (East Coast) routinely for 3 years. I never broke any of the above parts. I did grenade the front dif'.

On the other hand, I watched friends with stock 6 cylinders snapping the same axles running 33 ATs.

Some of it's luck, some of it's Jeep Karma.

[la mula pescadora]

it will be fun to see a fsj on the track

[Veepster]

what is breaking your friends Camaro is the starting line launch. It is not the amount of HP it is how fast you want to put it to use!

[rhamby]

I'd be mindful of the torque you get from it, too. What diffs do you have?

A QT and diff's in good condition can handle a lot of power, but slack and wear will be the determining factor on what you experience with your rig.
Let's see - 33's, 6sec. I'd consider a JATO... :D

[Marvin Gates]

You are planning on using the wrong car as a 6 second 0 to 60 thing. I've been down this road before, there is just to much mass and a FSJ is about as aerodynamic as a brick. I believe you are wasting your time but if you have enough money you can do just about anything. Just my two cents!

[joe]

I can't quote ya any torque/hp numbers but FWIW back when the factory sponsered J-trucks for the long haul Baja series offroad races they ran the BW/QT. They could have run the D20 but chose not too.

[Michael]

Okay now we are talking my language. LOL..
Your friend is getting a lot of torque upon take off. Which a standard gm 12 bolt rear end is plenty strong, but the axles are horible. He, to save any money, would have to get special axles made 35 spline or more to eliminate his issues. With my drag car, 73 datsun 240z, it is full chassis, and yes I did put in a Ford 9" for strength and the easier access to the pumpkin(gears). They do not twist/torque near as much as the gm 12bolt. Especially when you are talking 800-1000 hp... So on your waggy. I would say you would not need to do too much. But since you have d20 or 44 not sure which year rig you have it may be difficult to get aftermarket axles that can handle such a rating. But on that note. Anything can be done. If you are talking what I imagine you could build the 360 would be around 400 hp. Then as long as everything in the rear is built right or strong then you should not have any issues. You will probably spin the tires unless you put some slicks on that bad boy. But for mud....it would be great. You will have ample amount of power for wheeling.
And sense your tires will not bite much you will and should be okay...Unless the rear is tired. Ohhhh...and by the way...I have seen Scouts run 9-10 seconds at the track...It is pretty fun to watch. :D :D Have fun.... When mine goes I plan on bumping it up to about 340-400 hp too. :eek:

[Narnian]

This is good info so far guys! 0-60 in 6 seconds really isn't THAT fast. It translates into roughly a 14.5 second car. My 90 Vette does 0-60 in 5.5 seconds stock. If I want a screamer I'm going to soup the Vette. I just want my Jeep to be Quicker than a LM002. I'm amazed folks have gotten Scouts in the tens. I'd be willing to bet those Scouts are not any good as daily drivers anymore though. My Jeep will always be a daily driver - even if it only gets 8 mpg.

From talking to a few folks today, and from some of your comments, it sounds like I will only need a 400 HP motor to get where I want to go. I think what everyone is saying is that the drivetrain will be OK with that, as long as I don't floor it everytime I go anywhere from a dead stop. I think it's in my sig, but just in case you missed it I have 3:31 rears turning 33" tires. I don't remember if I have 20's or 44's for the difs. I have the NP219 QuadraTrack attached to the 727 autotrans. Based on that, and knowing how heavy and anti-aerodynamic the rig is, how much torque is the engine I buy/build going to have to put out? Anyone have a calculator?

I looked at that auction Ralph. Very tempting, but I was thinking I'd wait for my motor to die and buy a crate motor, and just add some bolt on's. That could be fun though.

[ January 04, 2002: Message edited by: Narnian ]

[joe]

<BLOCKQUOTE>quote:</font><HR>Originally posted by Narnian:
I think what everyone is saying is that the drivetrain will be OK with that, as long as I don't floor it everytime I go anywhere from a dead stop. I have the NP219 QuadraTrack attached to the 727 autotrans. <HR></BLOCKQUOTE>

Narnian,
When I replied earlier to your post I apologize...cause when you said Quadratrac I thought you had the orininal one not the NP219.
What I said about the factory using them in the Baja runs applied to the Borg-Warner QT's not the later NP's. I wouldn't put near as much faith in the viscous coupled NP219 than I would the original BW/QT. Sorry for the confusion.

[dennis w helt]

hey ive got a s10 4x4 with a 355 in it with 33 bfg,s and it runs 13.23 not to bad but when i go rompin in the mud it never fails i break a front axel. snap but i got stock rear end and shelled it once.

[Narnian]

<BLOCKQUOTE>quote:</font><HR>Originally posted by dennis w helt:
hey ive got a s10 4x4 with a 355 in it with 33 bfg,s and it runs 13.23 not to bad but when i go rompin in the mud it never fails i break a front axel. snap but i got stock rear end and shelled it once.<HR></BLOCKQUOTE>

I think the difs on the FSJ are considerably beefier than what you get on an S10, but you are also moving a lot more weight. That's good information too.

[Narnian]

<BLOCKQUOTE>quote:</font><HR>Originally posted by -joe:

. . . I wouldn't put near as much faith in the viscous coupled NP219 than I would the original BW/QT. Sorry for the confusion.<HR></BLOCKQUOTE>

Should I be looking for an older Chief to put this $4500.00 motor into? Or do you think I'll be OK with the one I have?

[joe]

<BLOCKQUOTE>quote:</font><HR>Originally posted by Narnian:


Should I be looking for an older Chief to put this $4500.00 motor into? Or do you think I'll be OK with the one I have?<HR></BLOCKQUOTE>

Tough question...
Depends some I guess on what condition your 81 is in and how much you like it. Personally I prefer the pre-80 rigs for their choice of drivetrain but on the downside is parts are getting hard to find for the BW/QT. If it were me and had what you do I would use what I have and later if the 219 goes south replace it with a part-time 208 x-case. If your rig is pretty rough and you're not particularly fond of it I'd prolly save the motor for a pre-80 but that's just me. If a full-time case is something you really want I don't know what to recommend cause even the later 229's are also getting somewhat harder to get parts for and when you do they're expensive. For the time being I'd go with what'cha got and play it by ear...&lt;shrug&gt;.

[Narnian]

My rig is in pretty nice condition. I have two 219's, one in the rig, the other waiting for the one in the rig to blow up. They are both in good condition.

I think I'll stick with what I've got.