Topic: I need the best bang for my $$$

[colorado_jeeper]

Just installed the 4.0 TB I got off ebay. It was from a 96-98 cherokee/wrangler, that's how it was listed. I did have to use all of the sensors from my 2.5 due to different connector styles. Otherwise, it was a direct bolt-on and the intake manifold itself is big enough for it. I did notice a difference in power at higher speeds, which is what I was after. Now all I have to do is either get a new spacer, or try and bore out the one I already have...

[chrisfranklin]

Buy a big, old sail boat and sell the jeep.  Vs. a 4banger CJ/YJ/TJ, you'll spend less money taking care of the boat   Kidding.  

Gearing -- here's a good Jp magazine piece:  

http://www.jpmagazine.com/techarticles/drivetrain/axletech/154_0909_gearing_for_power/index.html

[chardrc]

Gearing -- here's a good Jp magazine piece:  

http://www.jpmagazine.com/techarticles/drivetrain/axletech/154_0909_gearing_for_power/index.html

$350 for  a 4.0l throttle body form a junkyard  i don't what to know what kinda junkyard they go to.

[sharpxmen]

$350 for  a 4.0l throttle body form a junkyard  i don't what to know what kinda junkyard they go to.

it's a tbi, must have something to do with it. not sure if it's a direct swap either, the 2.5L TBI is 44mm at the bottom (below the butterfly), they mentioned 58mm which is quite a bit larger.

[colorado_jeeper]

i paid $40, with shipping for my 4.0 tb. the intake manifold on my jeep is big enough for the 4.0, so no extra work necessary.

[chrisfranklin]

$350 for  a 4.0l throttle body form a junkyard  i don't what to know what kinda junkyard they go to.

Didn't see that.  The 62mm one I got off ebay a few years back only ran me around $100. 

[sharpxmen]

Didn't see that.  The 62mm one I got off ebay a few years back only ran me around $100. 

i paid $40, with shipping for my 4.0 tb. the intake manifold on my jeep is big enough for the 4.0, so no extra work necessary.

it's TBI, they come with an injector and the FPR on them - still $350 is quite a bit but they are more expensive than the MPFI t/b

[chrisfranklin]

it's TBI, they come with an injector and the FPR on them - still $350 is quite a bit but they are more expensive than the MPFI t/b

The way I'm reading it, the performance parts and 58mm TB went on the '95 yj.     On the second YJ -- the '89 with the tbi 2.5 -- he ended up doing just a axle gear change and didn't change the TB or anything else. 

So, to me, it reads like he paid $350 for a junkyard 58mm tb for the '95 mpfi 2.5.   

[chardrc]

the 2.5L TBI is 44mm at the bottom (below the butterfly), they mentioned 58mm which is quite a bit larger.

where did you find the opening size of the 2.5l tbi? I've  never found it anywhere when searching.

[sharpxmen]

where did you find the opening size of the 2.5l tbi? I've  never found it anywhere when searching.

i got one and measured it. working on getting an oversized one done, it is 52mm on the outside on the narrowest section, so the most i can get out of it is 50mm - still about 30% improvement on the cross section. I got that bored out but i need a matching butterfly now.

[chardrc]

i got one and measured it. working on getting an oversized one done, it is 52mm on the outside on the narrowest section, so the most i can get out of it is 50mm - still about 30% improvement on the cross section. I got that bored out but i need a matching butterfly now.

definitely looking forward to some pics and details of that... so you are making tbi mods now rather than working on your supercharger? got a jeep lined up to test it?

[sharpxmen]

definitely looking forward to some pics and details of that... so you are making tbi mods now rather than working on your supercharger? got a jeep lined up to test it?

i'm waiting for warmer weather. was working on the adjustable fpr and i figured i'll see if i can get the tbi enlarged (found a t/b at the junkyard) - just as an exercise. not sure if there's any interest in it, i have had one of the 64mm t/b for sale but no takers yet and so far i am spending - just having fun i guess. If it turns out good i'll post it in the garage sale.

[sharpxmen]

The way I'm reading it, the performance parts and 58mm TB went on the '95 yj.     On the second YJ -- the '89 with the tbi 2.5 -- he ended up doing just a axle gear change and didn't change the TB or anything else. 

So, to me, it reads like he paid $350 for a junkyard 58mm tb for the '95 mpfi 2.5.   

interesting, the 4.0L from what i remember is 55mm at the bottom, i'll measure it later today. But to your point that is a lot of cash for a t/b, you can most likely buy a brand new one for that money so not sure what they are smoking (maybe that t/b came with a matching 58mm bong ready to go).

[FourbangerYJ]

i'm waiting for warmer weather.

I thought you were having the warmest weather in the last 100 years or something like that? 

[sharpxmen]

I thought you were having the warmest weather in the last 100 years or something like that? 

for this time of the year, doesn't mean i'm down at the beach sunbathing