increase fuel mileage

[87manche]

Meh its already there so i figured I'd leave it

K&N on a stock airtube?

pull the silencer out if it's still in there. It's a plastic venturi looking bit.

 

[sandsgg]

 

[ChevelleSSLS6]

K&N on a stock airtube?

pull the silencer out if it's still in there. It's a plastic venturi looking bit.

I haven't seen one, (long gone when I got my XJ) but I've heard they're pretty restrictive.

 

[87manche]

I pulled the one out of the 87.

it necks the tube down to half the diameter for about 3 inches.

 

[sandsgg]

I'll have to look into that, it probably doesn't have one but i will check

 

[old_man]

The simplest and cheapest mileage improvement on an older rig is to clean the injectors. The best way is to run a can of BG44K though the gas. It will clean up the injectors and get rid of built up carbon. It works better than any of the cheap stuff. It isn't that easy to find. Some NAPA stores handle it. If you can't find it, the Lucas stuff is the second best. Don't even think about using STP.

I run a can in every vehicle I own every 10k miles.

 

[87manche]

I'll have to look into that, it probably doesn't have one but i will check

I'm pretty sure that you're missing the plastic piece that the silencer was installed in.

 

[sandsgg]

I'll look into getting a can of that stuff and as for the silencer i don't think i have one

 

[cruiser54]

Get one of these and install it. Keep the reading as high as possible.

https://www.google.com/search?q=vac...7MaHgiwL7vIGQBA&ved=0CD0QsAQ&biw=1680&bih=808

 

[sandsgg]

Install it where? And on a side note there is a guy near me selling an 8.8 for a 110 bucks with 3.55 gears that I'm thinking of getting

 

[kastein]

If that's the gearing you want, that's a pretty damn decent price whether it's got new mounts on it or not. All the yards around me charge $130 to $150 regular price for a rearend, I sometimes get them as cheap as $100 if it's a yard I buy from frequently enough.

If that's got mounts for your jeep already welded onto it, and is the ratio you aim for, jump on it and don't look back. Just check the welds first, I've seen some scary fab work on custom stuff for sale before.

 

[sandsgg]

It's straight off an exploder

 

[cruiser54]

Install it where? And on a side note there is a guy near me selling an 8.8 for a 110 bucks with 3.55 gears that I'm thinking of getting

On the dash.

 

[sandsgg]

So is that essentially like running a boost gauge in reverse concept wise. Cuz i know in a turbo car you get your best mileage at no boost

 

[kastein]

basically. Effectively, you keep vacuum as high as you can, and the engine/ECU will keep air/fuel ratio as close to stoich as it can, which results in the minimum fuel being used.

 

[sandsgg]

Sweet I'll have to look into that probably put it in one of those blank panels on the dash

 

[sandsgg]

So another question, if i plan on 33 10.5 tires, should i go with 3.55 or 4.10 gears

 

[kastein]

I'm on 3.55s right now... it's a dog.

They were cheap though, front axle cost me $50 from a friend and rear cost me another $50 from another friend.

If 4.10s are in the budget, get them for sure, if they aren't, 3.55s will keep you moving till they are. 5th gear will be useless and you'll be slipping the clutch quite a bit to get moving in 1st.