maybe2fast
NAXJA Forum User
- Location
- COMMERCE, MI
XJ tuned box...hahahahahahahah right...no
keep your airbox?
- Thread starter j99xj
- Start date
Years ago I tried back to back 1/8 1/4 and 30 to 70 MPH 4 gear only test. No improvement was to be had by removing the air filter. This was on another wise bone stock 01 5 speed. It was also tried on a 89 auto with a low resistance muffler. Also no improvement.
We also tried TB spacers of 1/2 inches , 1 inch. 1 and 1/2 inches and a 2 inch spacers.(home made wood) A note: Becouse the hood would not close with the 2 inch spacer and stock air cleaner in place. The hood was removed for test with this configuration. But new baseline runs were made with hood off so I feel the comparisons are valid. No improvement was found.
Same for TB will the bulge removed and some combinations of all three mods still no help.
We also tried TB spacers of 1/2 inches , 1 inch. 1 and 1/2 inches and a 2 inch spacers.(home made wood) A note: Becouse the hood would not close with the 2 inch spacer and stock air cleaner in place. The hood was removed for test with this configuration. But new baseline runs were made with hood off so I feel the comparisons are valid. No improvement was found.
Same for TB will the bulge removed and some combinations of all three mods still no help.
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seanyb505
NAXJA Forum User
- Location
- Simpsonville, SC
Maybe the air filter wasnt the restrictive part of the stock setup?
That article was talking about sportbikes in which case it has a point. A giant rectangle with corrugated tubing? I dont think too much frequency tuning went into it.
JNickel101
NAXJA Forum User
- Location
- Alamogordo, NM
I dunno, the AMSOIL cone filter I have is pretty awesome. xEleventy billion times better than the K&N one....its not an oiled gauze one...
Talyn
NAXJA Forum User
- Location
- Radford, Communistwealth of Virginia
You have the Amsoil EA filter or the older oiled foam one?
Gravesdiggerxj
NAXJA Forum User
- Location
- Salt Lake City, Utah
WOW... uninformed much? :roflmao:
take a look under the hood of a prerunner, drag car, mud truck, comp rock buggy... what do you see? probably not a stock airbox... but I'm just guessing. :wave1:
eace:maybe2fast
NAXJA Forum User
- Location
- COMMERCE, MI
mines in the landfill
kf_chris
NAXJA Forum User
- Location
- Charlotte, NC
had a Rusty's intake then went mudding in FL
after 4 hours of unbolting intake parts and drying them out (luckily didn't hydro) I didn't hit anything big and deep
put the stockie box back on with a k&n filter ant cut a corner out of the front. I'm not running the risk of water again from under the hood. just my opinion and my setup
after 4 hours of unbolting intake parts and drying them out (luckily didn't hydro) I didn't hit anything big and deep
put the stockie box back on with a k&n filter ant cut a corner out of the front. I'm not running the risk of water again from under the hood. just my opinion and my setup
Talyn
NAXJA Forum User
- Location
- Radford, Communistwealth of Virginia
I did... thought I was chasing a lifter tick.. a few months later and I have parts of a piston in the oil pan.
bjoehandley
NAXJA Forum User
- Location
- WeGo, Chi-Town, Ill
I just hacked open the front of a boneyard XJ airbox and used a drop in K&N (street driven XJ) and would like to eventually put a smooth silicone tube on place of the stock corregated piece. I've just not had the chance to measure it, and have been spending too much cash on gas and RC rock crawler stuff:wow:
DeathValleyPaul
NAXJA Forum User
- Location
- Los Angeles Area
Louvering the hood above the throttle body lowered the temp at the throttle body, thus providing cooler air. The temp at the throttle body is just too damn hot as it is.
bjoehandley
NAXJA Forum User
- Location
- WeGo, Chi-Town, Ill
Just cutting the front of an airbox and using a drop in K&N makes a difference in sound......not that I'm complaining
2001XJ
NAXJA Forum User
- Location
- Canton, MI
What about jeeps that see mostly woods, logging trails and 2-tracks......mainly MINIMAL dust, mild mud (not enough to worry about) and logs and rocks. Would one of the rock-it, rusty's or K&N filter kits that eliminate the box be beneficial? I always see a lot of guys complaining about maintenance on openair intake systems with oiling, dust, etc etc.
Advice?
TIA
Advice?
TIA
The main reason not to throw away the air box is that having a cone filter sucking hot engine bay air will LOWER your power, to the tune of 1% per 11* increase in air temperature.
If you do the math, a K&N with the airbox deleted will lose power... I had a thread about this where I measured intake air temps and found an average of 65* hotter intake air from deleting the air box... That's about 6% average LOSS of power and torque through the entire power band. Which is well over what a K&N is going to give you. And a K&N is mostly going to give you a small increase at PEAK. not a 6% increase through the entire curve.
So if you want less power and more particulate matter sucked into your engine, delete the air box and put a K&N in.
I don't have the link but if you search for "home brew cowl induction hood" the first link should be my writeup (different username at the time)
If you want to upgrade your induction system, that thread will help. Most of it is also duplicated over on Jeepstrokers.com in my project thread.
If you do the math, a K&N with the airbox deleted will lose power... I had a thread about this where I measured intake air temps and found an average of 65* hotter intake air from deleting the air box... That's about 6% average LOSS of power and torque through the entire power band. Which is well over what a K&N is going to give you. And a K&N is mostly going to give you a small increase at PEAK. not a 6% increase through the entire curve.
So if you want less power and more particulate matter sucked into your engine, delete the air box and put a K&N in.
I don't have the link but if you search for "home brew cowl induction hood" the first link should be my writeup (different username at the time)
If you want to upgrade your induction system, that thread will help. Most of it is also duplicated over on Jeepstrokers.com in my project thread.
Talyn
NAXJA Forum User
- Location
- Radford, Communistwealth of Virginia
You are aware that on the late model XJs that the air box is sucking in hot engine bay air?
Here's what I did with mine:
Can't find a pic of the intake, but it's a FIPK w/ an amsoil eeau3090 filter on it and boxed in w/ a sunscreen visor. Course mine had the plastic cap there in front of the box, and yes, the stock box does suck in hot engine/radiator air. I vaguely remember my 88 or 92 having a tube connecting the hole and airbox.
Can't find a pic of the intake, but it's a FIPK w/ an amsoil eeau3090 filter on it and boxed in w/ a sunscreen visor. Course mine had the plastic cap there in front of the box, and yes, the stock box does suck in hot engine/radiator air. I vaguely remember my 88 or 92 having a tube connecting the hole and airbox.
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No I'm not aware of that, I have a 97 that goes to the square hole in the header panel, which year was it that doesn't have a hole that is more or less at the header panel opening? 2000 to 2001 I'm guessing? Those are the only years I don't have any real hands on experience with. Can you post a pic? Where did they relocate the inlet?
Anyway assuming you're right whats the point? that the factory can screw something up after 15 years of getting it right?
You don't have to take my word for it though, I recognized that there were a LOT of
users throwing away power back when I was moding my own (and a lot still doing it). I knew I might get some flack from the odd person who stuck a K&N on the end of their intake tube. So I took more or less rigorous scientific intake air temp readings documented as much as I felt was necessary to prove my point and put it in that thread.
