[NaeKid]

Installing Airaid spacer PN: 310-510 in "stock" LJ with stock tires and gearing.

All stock showing the layout under the hood:



Disconnect the Mass Air Flow sensor from tube:



Flat head screwdriver will loosen the band-clamps holding air-tube in place:



There are several bolts (all 10mm head) that hold the throttle-body and the linkage bracket in place - loosen all of them, and remove the three sensor plugs off the throttle body. Remove the old gasket and clean the throttle body completely of any dirt or grime:









Take your new Airaid spacer out of the package, with the supplied bolts (again, 10mm head) and gaskets and set onto the air-runner. Feed the four long bolts (with washers) into the throttle body w/ spacer and start the threads. Take the short bolts with the supplied mini spacers and thread into the cable-bracket.



Tighten it all up, re-connect the three sensor plugs, re-install the air-tube, re-connect the air-flow sensor and give it a quick run.





If you did everything right, you should have a little more horsepower, torque and better milage.

My baseline right now for gas-milage is 400km / tank (average). Over the next few weeks I will report on my gas usage vs km driven. This will be normal around town driving just as what has been going on for the last few tanks. No plans for major highway travels at this time.

[Unlimited04]

nice I've got a spacer & a 63mm TB i still need to install....been sitting in the garage for over 2.5 yrs!

How is the mating between the TB, the intake and the spacer? I think the intake is 63mm diameter, how about the spacer? Looks like your using the stock tapered TB.

Nice work

[NaeKid]

I just finished the install about 1hr ago. My Jeep is "basically stock" for now. The air filter is stock replacement and everything else is exactly as it came from the factory, except for the rear bumper / hitch and a few dress-up items on it. You can see some of the changes I have done to it in my gallery-space.

I have a 2.5" lift-kit sitting in my basement waiting to be installed - and - it has been waiting for just over a year.

[Xlr8n]

Not to burst your bubble, but it would serve more purpose as a paperweight on your desk. They add nothing to a stock TB setup.

[NaeKid]

It is just a stepping-stone to where I want to go with this. Next plan is for a snorkel for the cold-air factor and a high-flow air-filter to go with it. After a bit, then a new free-flow exhaust (header back) and more testing.

I am doing the bits and pieces as time and money allow.

[chappy84]

Good job. You should consider writing install direction booklets. LOL.
Let us know if you notice any changes please, I am not thinking that you will but I am rooting for you!!!!

[Xlr8n]

Originally Posted by NaeKid

It is just a stepping-stone to where I want to go with this. Next plan is for a snorkel for the cold-air factor and a high-flow air-filter to go with it. After a bit, then a new free-flow exhaust (header back) and more testing.

I am doing the bits and pieces as time and money allow.

Not to burst anymore bubbles, but you'll be wasting your money on those mods too. Unless of course you just like the looks and sound. The 4.0 is quite content with running it's best in factory form. The air supply and exhaust mods do little to nothing for performance enhancment of this motor compared to other vehicles you may have worked with. Do a search here on those accessories before you spend.

[AlTheKillerr]

i did all this and there is a performance increase however thats when you are at open throttle. my buddy did this first and we "raced" his tj vs my stock tj and he killed me. i turned around and did the same and i kept up with the next go around. out on the trail there is no difference that i have noticed. also i dont beleive there to have been any increase in mpg

well the same except for the intake itself. we both have the airaid cold air intake not a snorkel

[vitaminwater]

Originally Posted by Xlr8n

Not to burst anymore bubbles, but you'll be wasting your money on those mods too. Unless of course you just like the looks and sound. The 4.0 is quite content with running it's best in factory form. The air supply and exhaust mods do little to nothing for performance enhancment of this motor compared to other vehicles you may have worked with. Do a search here on those accessories before you spend.

x2...Jeep spent more than 10 years tuning the 4.0, and there isn't much more you can get out of it. Save your money by not getting the fancy bolt on stuff, and build a 4.7 stroker instead

[NaeKid]

I tried a different "vortex" system that I installed at the edge of the air-box 4 tanks of gas ago. It made the power feel a bit better, but my gas-milage dropped by 25km / tank (15 miles / tank). It was said to increase gas-milage by upto 35%.

The Airaid website has reports of between 2 and 5 mpg better. If that is true, I should gain 25 - 50 km / tank. The altitude of Calgary is at 3,438' above sea-level. When I drove my Jeep to the east-coast, my average gas milage went upto 550km / tank (340 miles / tank).

My thought is that if I can make the air "denser" like it is near sea-level, I might be able to get near the same km / tank.

[Jerry Bransford]

Gotta go with what the others are saying NaeKid, TB spacers don't do a thing when mounted under the kind of TB your YJ and our TJs use. Spacers can really boost performance when placed under carburetors or throttle-body injection systems but not under the type of TB our Jeeps have. Only air passes through the TB in ours, all you're doing is creating a longer air path. Someone gave me a TB spacer to try out years ago, it's been in my junk box collecting dust for at least five years now.

[NaeKid]

I just filled up since installing the Airaid spacer. I will say that I am impressed with it. Overall, I find that I have the power to shift sooner and run my Jeep at "lugging" RPM's without actually lugging the engine (1200 to 1500 RPM in 5th gear at 50km/h). I am using the same brand and grade of gas (the cheapest there is). I haven't changed my driving style - I am not a light-foot on the gas - I give it hard when I need to, and I drive it nice when I need to.

So - onto the facts (just the facts, mam).

I drove 457km (284 miles) from last fillup till the yellow warning light came on.
I filled up at 474km (294.5 miles)when I reached the gas station.
I put in 59.3 litres (13 gallons) which has been around average for a fill-up (around 60L).

That means that I got 22.5 miles to the Canadian gallon.

I have been as low as 375km for a 60L fill up (~17.6 mpg) - so, I am very, very impressed. I will report on the next fill-up again.

[Pillswoj]

NaeKid,

Just for reference they speak US Gallons here (I know its wrong but they do )

For the conversion use 3.78 L/USG not the 4.54 L/ImpG that you used.



Jeff

[JasonJW]

If its doing anything at all, it defies physics, or it is curing a problem that isn't readily apparent. Spacers work on engines designed for throttle body injection. The air/fuel mixture passes through the spacer in that application. The spacer functions by giving the air/fuel mixture more time to atomize and sometimes smooths the airflow a bit but in this application, there is no fuel in the air when it passes through the spacer. Its just air. The fuel gets added in the combustion chamber. My only guess is that it could be slightly smoothing the transition from the throttle body to the plenum, but that shouldn't account for much gain.

PS - Before you put a high-flow air filter on your jeep, search some of the great info Jerry and others have posted on how poorly they trap particulates.

[WillysEdition04]

So far the only engine bolt-on's that seem to have had positive results are the Trail Jammer kits from Edge...