Nitrous on 4.0 cherokee

[fordrulz78]

I am purchasing a nitrous system for my 2001 cherokee. Its going to be a dry system. The only question is what can the 4.0 handle? I am going to use it for 250 foot mud bogs and a few other things. I will only use it occasionally but would like to stay within the motors limits. My plan is to run approx a 50 horsepower shot. Anyone have any comments or advice. The motor just does not have the power to use 3rd gear in low range or 2nd in high(its automatic). I have 4.56 gears and detroit lockers. I also hate how i do not have control over the 1st to second shift and cannot find a manual shift kit for it like the pre 1996s. Im new on the site and have been into fords with 44 boggers for a long time and now im modifying the daily driver for the 6 cylinder class.

 

[BrettM]

I am purchasing a nitrous system for my 2001 cherokee. Its going to be a dry system. The only question is what can the 4.0 handle? I am going to use it for 250 foot mud bogs and a few other things. I will only use it occasionally but would like to stay within the motors limits. My plan is to run approx a 50 horsepower shot. Anyone have any comments or advice. The motor just does not have the power to use 3rd gear in low range or 2nd in high(its automatic). I have 4.56 gears and detroit lockers. I also hate how i do not have control over the 1st to second shift and cannot find a manual shift kit for it like the pre 1996s. Im new on the site and have been into fords with 44 boggers for a long time and now im modifying the daily driver for the 6 cylinder class.

manual shift? check the link in my sig. new paddleshift and pushbutton model coming out very, very soon.

 

[Dr. Dyno]

I am purchasing a nitrous system for my 2001 cherokee. Its going to be a dry system. The only question is what can the 4.0 handle? I am going to use it for 250 foot mud bogs and a few other things. I will only use it occasionally but would like to stay within the motors limits. My plan is to run approx a 50 horsepower shot. Anyone have any comments or advice. The motor just does not have the power to use 3rd gear in low range or 2nd in high(its automatic). I have 4.56 gears and detroit lockers. I also hate how i do not have control over the 1st to second shift and cannot find a manual shift kit for it like the pre 1996s. Im new on the site and have been into fords with 44 boggers for a long time and now im modifying the daily driver for the 6 cylinder class.

A 100 shot is as much as the 4.0 can handle but beware that you'll need to upgrade the fuel pump, otherwise you can say goodbye to the engine if it runs lean. I'd be more concerned about the drivetrain surviving a sudden hit of 100hp/175lbft when the nitrous reaches full steam at ~3000rpm.

 

[BrettM]

A 100 shot is as much as the 4.0 can handle but beware that you'll need to upgrade the fuel pump, otherwise you can say goodbye to the engine if it runs lean. I'd be more concerned about the drivetrain surviving a sudden hit of 100hp/175lbft when the nitrous reaches full steam at ~3000rpm.

That's a good point. I wouldn't worry at all about the AW4 (but wouldn't lock the torque convertor) the np231 will probably survive short term, but will likely stretch the chain a lot faster. The real question is what are you running for axles and tires?

 

[tealcherokee]

That's a good point. I wouldn't worry at all about the AW4 (but wouldn't lock the torque convertor) the np231 will probably survive short term, but will likely stretch the chain a lot faster. The real question is what are you running for axles and tires?

id run a 75 shot, aw4, d300, d44's fornt and rear for 33's, 35's with up graded shafts, anything bigger, hello 60's

 

[Dr. Dyno]

That's a good point. I wouldn't worry at all about the AW4 (but wouldn't lock the torque convertor) the np231 will probably survive short term, but will likely stretch the chain a lot faster. The real question is what are you running for axles and tires?

I also forgot to mention that the sudden rise in cylinder pressure brought on by a 100 shot of nitrous can, over time, beat the rod bearings (especially the upper half) to a pulp. A smaller shot of nitrous (say 50) would allow the rod bearings to live a bit longer.
There's no getting away from the fact that a nitrous shot WILL shorten the life of the engine and drivetrain. It's just a question of by how much.

 

[tealcherokee]

I also forgot to mention that the sudden rise in cylinder pressure brought on by a 100 shot of nitrous can, over time, beat the rod bearings (especially the upper half) to a pulp. A smaller shot of nitrous (say 50) would allow the rod bearings to live a bit longer.
There's no getting away from the fact that a nitrous shot WILL shorten the life of the engine and drivetrain. It's just a question of by how much.

"Nitrous is like a hot chick w/ an STD, you wanna hit it, but you'r afraid of the concequences."

my buddy is really into forced induction, he has a dodge avenger in the 9's. turboed 2.4, 23psi of boost, and a 200 shot (multiport) set up as 2 - 25 shots per cylinder as the car goes down the track. hes got a pretty cool set up, all computer controlled, fires by it self as its going down the track

 

[fordrulz78]

i have the stock low pinion 30 front and 8.25 rear both with detroits and 4.56s the nitrous will be used on straight line shots in loose mud. i will stick with the 50 shot for reliabillity reasons. I have dana 60s front and rear in a 78 f250 with yukon spools, 5.38 gears and the full float rear is now drilled out to accept 1.5 inch axles. I guess you can call these spares for the jeep. Id rather not go full width yet. I just wanted to know if anyone has ever done what i am doing. I will run a 50 shot only at wide open throttle and see what happens. Next event is this weekend and i am trying to get it in for testing.

 

[fordrulz78]

I forgot to mention i have 33x12.5 super swamper tsl on 15x10 rims. havent broken an axle yet with lots of abuse in mud. always lift when im turning the wheels and stay away from hopping.

 

[N20Jeep]

A 100 shot is as much as the 4.0 can handle but beware that you'll need to upgrade the fuel pump, otherwise you can say goodbye to the engine if it runs lean. I'd be more concerned about the drivetrain surviving a sudden hit of 100hp/175lbft when the nitrous reaches full steam at ~3000rpm.

it will take 125 jets for about a month....(about 3 10# bottles)

but truthfully, the AX-15, and my diff all survived the jets i went through (40-75-125)...the clutch was starting to slip pretty bad towards the end though...

 

[Dr. Dyno]

Like I said:

There's no getting away from the fact that a nitrous shot WILL shorten the life of the engine and drivetrain. It's just a question of by how much.

 

[N20Jeep]

Like I said:

well "NOS/86" off of Jeepforum ran his on 100shot for atleast a year....

he has since taken the juice off....but the motor is still runnin

 

[Cjmartz2k]

Ehh, 300 shot should be alright. Throw it on there and let us know how it goes :viking: