[xj 98/yj 94]

ok... i would like more power.. yes the 4.0 has nice power, but i like more... just somethign i want to do with the yj, always have....so on to my delema....

choice A.

rebuild, stroke, and kenne bell my 4.0

choice B.

used ls1, auto tranny

i can get ls1 for around 2grand, plus mounts, and trans...

stoked/rebuilt 4.0 is around 2-3grand, and kenne is prob another 3g.. are my numbers right? i also want to hear from people that have a blower on their 4.0 or are stroked, also want to hear from V8 converted peeps to and how their experiences are... this isnt gonna happen for a while, but i like to plan out my projects ahead of time so i know what needs to be done and how much money i will need....and if you say just stroke it it will be plenty.. yes for a while, but i know i will eventually put a blower on it then, so just gonna say those are the 2 set ups i lookin at no matter what.

[goatboy]

The Jp Magazine that just came out has a real nice feature in it on supercharging the 4.0...check it out...But, don't forget...horsepower costs money, just how fast do you want to go? The article points out that typically, it costs an average of $100 a horsepower, I tend to go along with this figure...

[xj 98/yj 94]

Originally Posted by goatboy

The Jp Magazine that just came out has a real nice feature in it on supercharging the 4.0...check it out...But, don't forget...horsepower costs money, just how fast do you want to go? The article points out that typically, it costs an average of $100 a horsepower, I tend to go along with this figure...

i just read that article last night.. here the problem, well it says it for '00 up 4.0...

other thing i dont like about it tho, its centerfugul blower... i want roots style... those make more power up in the rpms, i know my buddy has one on his cobra, it behaves like a turbo.. i want the low end power a kenne bell makes or a V8, cuz when you are crawling, you arent high in the rpms..

[mean90yj]

you are if you have a 5:1 atlas t-case....

[xj 98/yj 94]

Originally Posted by mean90yj

you are if you have a 5:1 atlas t-case....

huh?.......

[tuckinauster]

Originally Posted by xj 98/yj 94

huh?.......

when your geared that low your engine is gonna be screaming when the jeep is going 10 mph

[xj 98/yj 94]

Originally Posted by tuckinauster

when your geared that low your engine is gonna be screaming when the jeep is going 10 mph

i not going that low tho, i just leaving the NP231 in there, maybe a rubi t/c at most... but i just want to know opinion on which swap is more cost effective, that is all

[rustywrangler]

strokin the 4.0 would be tons cheaper(at least thats what I have heard) than throwing in an LS1 although it would be a sweet motor.

What about a third option of a SBC? seems to be a popular swap.

[Jeeples]

You are also forgetting to add engine management to the overall cost on each of those options. On the 4.0 route you'll need a stand alone fuel management system, like a Megasquirt. If you go LS1 you might wanna get friendly with the people at Painless Performance for your wiring needs and then find out what some of the guys at www.ls1.com are running for standalone ECUs.

As far as the centrifugal vs. roots style blower, both will behave the same way, as each of them are at full boost regardless of RPMs, other things will play into how the power is delivered and when, such as gearing, camshafts, etc. If your buddy had a feeling of lag with any kind of S/C, there's something else wrong here.

Also, centrifugal blowers will make more power in the long run as there is less heat soak with the incoming air charge like many experience with roots blowers, and when you're crawling along the trail, there never is enough airflow.

[xj 98/yj 94]

Originally Posted by Jeeples

You are also forgetting to add engine management to the overall cost on each of those options. On the 4.0 route you'll need a stand alone fuel management system, like a Megasquirt. If you go LS1 you might wanna get friendly with the people at Painless Performance for your wiring needs and then find out what some of the guys at www.ls1.com are running for standalone ECUs.

As far as the centrifugal vs. roots style blower, both will behave the same way, as each of them are at full boost regardless of RPMs, other things will play into how the power is delivered and when, such as gearing, camshafts, etc. If your buddy had a feeling of lag with any kind of S/C, there's something else wrong here.

Also, centrifugal blowers will make more power in the long run as there is less heat soak with the incoming air charge like many experience with roots blowers, and when you're crawling along the trail, there never is enough airflow.

the ls1 i looking at come with the computer, and there is an ls1 tuner near me... i will have to disagree with you on the blowers, but dont want to get in a debat about them.. i really just want to go V8, more i look into it, just seems like the better route to go...