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Old 12-22-2008, 08:45 PM   #1
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perf upgrades

this may be in the wrong place,if so correct me.i just bought a 1999 tj 4.0 with 95,000 and i'm looking to gain some power,and mostly fuel mileage.i just ordered a airraid throttle body spacer,airraid cold air box.what gains can i look for if any. thanks

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Old 12-22-2008, 09:10 PM   #2
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none. cancel the order and use they money for gas.

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Old 12-22-2008, 10:00 PM   #3
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x2, enjoy what you got! The 4.0 breathes about as good a it can, it's a great package for what it is designed for. Torque. Go play, and enjoy! Welcome to WF!
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Old 12-22-2008, 10:04 PM   #4
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The spacer would be really nice for a paper wieght or of you stand it on its side you could put through it...

I had an intake on my 99 tj 4.0 and i went from 16mpg to 9... i then put the stock box back on and went up to 16 again...
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Old 12-22-2008, 11:55 PM   #5
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none. cancel the order and use they money for gas.
ha, that's funny, but kinda sad. I also understand there's no cost effective improvement to be made. The 4.0 is my choice, it's a keeper.
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Old 12-23-2008, 10:08 AM   #6
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Quote:
Originally Posted by csxwrangler View Post
this may be in the wrong place,if so correct me.i just bought a 1999 tj 4.0 with 95,000 and i'm looking to gain some power,and mostly fuel mileage.i just ordered a airraid throttle body spacer,airraid cold air box.what gains can i look for if any. thanks
Can't speak for the Airraid, but I installed the AEM Brute Force kit w/ Banks Monster exhaust and she has quite a bit more pep..

This is a somewhat controversial topic, so to each their own!
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Old 12-23-2008, 12:18 PM   #7
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X2 on the AEM brute force intake, i gained 2-2.5 mpg more with the install, as long as I keep my foot out of it, it also has quite a bit more torque and the filter is oil-less
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Old 12-23-2008, 08:54 PM   #8
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x3 on the AEM. Mine came with a spacer and it did seem to breathe easier. I don't think it increased the MPG's though.
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Old 12-23-2008, 11:23 PM   #9
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mixed bag of comments.well,what about exhaust,other mods other than susp.this jeep will never see off road and action,maybe some snow on highway,as i work for the railroad and drive alot of highway miles.mostly looking to gain fuel mileage.
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Old 12-23-2008, 11:45 PM   #10
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stock engine i was getting 12-14mpg(1998 TJ 4.0, 5 speed, 120,000 miles, 3:73's on 33's)
i now have a homemade cowl/ram induciton, 63mm bored throttle body, high flow cat, flowmaster 50(2.5"), hypertech programmer, high flow water pump/housing/180deg, 3 row metal radiator, probably some other stuff i forgot...
NOW i average 18 city 20 highway.
my friend has a bone stock 03 + a hypertech(4.0, 5 speed, 65,000 miles, 3:73's on 30's) and i SMOKE him throughout the entire rpm range. starts all the way through 100mph my jeep picks up noticablly better.

*everytime ive bought a part has been to fix an issue(hypertech was a gift). my jeep is built to offroad, not drag race. alot of you people just calim snake oil on everything and you have not tested it. web wheelers.
(i dont buy into tb spacers though...)
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Old 12-24-2008, 12:43 AM   #11
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I did bunch of mods too. i seem to be getting pretty good numbers on the mpg.. 2-3 mpg gain (exhaust, intake, bored throttle body, electric fan etc)

completely stock i was getting 190 a tank (winter) before the light turned on...190/16=~12mpg, currently with all the mods (including some not listed above) i get roughly 18 mpg in the summer and 15-16 in the winter.
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Old 12-24-2008, 01:21 AM   #12
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i am getting 164/15 I always leave 1 gallon! My jeep sucks! I need help triple haha
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Old 12-24-2008, 10:29 AM   #13
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the first one i would do is drill out that throttle body.
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Old 12-24-2008, 11:39 AM   #14
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buy a honda if you want mpg...or v8 it or stroke it if you want power...those mods dont do enough to justify their cost in my opinion
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Old 12-24-2008, 11:46 AM   #15
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Quote:
Originally Posted by flattietj View Post
buy a honda if you want mpg...or v8 it or stroke it if you want power...those mods dont do enough to justify their cost in my opinion
i assume you have the mods installed and running?
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Old 12-24-2008, 04:15 PM   #16
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if you want mileage then put in a trans w/ overdrive.
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Old 12-24-2008, 04:34 PM   #17
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Quote:
Originally Posted by csxwrangler View Post
this may be in the wrong place,if so correct me.i just bought a 1999 tj 4.0 with 95,000 and i'm looking to gain some power,and mostly fuel mileage.
holy crap i just noticed it
lol you are in the wrong world ..wrangler and gains in fuel mileage don't coexist.
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Old 12-24-2008, 04:50 PM   #18
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No matter what anyone thinks happened after they installed a throttle body spacer under their TJ's throttle body, nothing happened. Mileage didn't change, performance didn't change. The type of throttle body the TJ uses which only passes air, no gas or air-fuel mixture, it does not respond to a spacer... not even a tiny amount.

Carburetors and the old throttle-body-injection (TBI) systems responded to spacers, but neither the TJ's air-only throttle body nor the engine will even notice the presence of a TB spacer.

If it were as simple and cheap as making the throttle body taller or installing a cheap piece of machined aluminum under the TB to add mpg and/or performance, Jeep and Detroit would have been already doing so for many years now.
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Old 12-24-2008, 05:01 PM   #19
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aaahh jerry is wrong one way or another.

He says stock gears will be too low for anything above 33" tires and 5th gear will not hold speed. He also says from above and in many other posts intake, exhaust and such mods dont do anything

well one way or another he is wrong because my rig holds speed just fine on 5th gear with 35s and stock gears, my mpg also went up and the only thing i hear is "i'm calculating my mpg wrong or my speedometer is wrong however i installed the speedometer gear him and mr C said i should install. Go figure.

Now if Jerry could read it and explain it... lol

ps for the ones that dont know... he blocked me...
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Old 12-24-2008, 10:07 PM   #20
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* i also have the correct speedometer gear installed.

and if this dosent proove something i dont know what will...pedal to the floor before i did all that i was LUCKY to crack 75 downhill with wind. i have hit the 100 with mods. where did my 25mph come from if youd like to continue the mod argument?

this summer i am going to do an electric fan (final possible bolt on performance mod)and after that is done, i WILL go and get dyno'd to see just how right all the web wheelers were.
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Old 12-24-2008, 10:45 PM   #21
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Quote:
Originally Posted by tigertrack1600m View Post
i WILL go and get dyno'd to see just how right all the web wheelers were.
now the next issue is does any one have a true wheel hp chart
the issue after that is will the dyno you do or the other one be correct.

Next, add gearing differences to that.. etc

Even a simple thing such as how much time you dyno ur rig for will make noticeable difference.

example... (red) 15 seconds to go from 2000 to 7000 rpm.. blue is 25 seconds run.

http://flyinmiata.com/tech/dyno_runs/NC_sweep_times.pdf
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Old 12-25-2008, 12:17 AM   #22
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the first one i would do is drill out that throttle body.
explain what your talking about,instructions and such.thanks
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Old 12-25-2008, 12:49 AM   #23
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if you ever clean ur throttle body you will find out that it shrinks at the end.

Its big at the butterfly and then shrinks. Go figure. The hole on the intake manifold is 60mm, the hole of the throttle body at the butterfly is 60mm but it shrinks right after the butterfly to i think 54mm. I made it all even. If you ever do that, remove the butterfly too, i ended up removing it after i drilled it out since i wanted to clean everything while i had it off.






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Old 12-25-2008, 03:52 AM   #24
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how the hell did you get that so smooth by the way?
i bought mine off ebay and mailed my stock one back for a core. cost me like $80 but id have rather done it your way...we have the same dremel

buuuuuut....mine is 63mm and has a thinner butterfly
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Old 12-25-2008, 09:14 AM   #25
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Originally Posted by csxwrangler View Post
this may be in the wrong place,if so correct me.i just bought a 1999 tj 4.0 with 95,000 and i'm looking to gain some power,and mostly fuel mileage.i just ordered a airraid throttle body spacer,airraid cold air box.what gains can i look for if any. thanks
What size tires do you have?
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Old 12-25-2008, 11:00 AM   #26
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Originally Posted by tigertrack1600m View Post
how the hell did you get that so smooth by the way?
i bought mine off ebay and mailed my stock one back for a core. cost me like $80 but id have rather done it your way...we have the same dremel

buuuuuut....mine is 63mm and has a thinner butterfly
I dont know how he did it but my buddy was gonna spend the $$ to get it done on ebay. Instead I got his and took it to the lathe in our shop at school and did the same thing for him for free. Its a little scary turning something that is so odd shapped but the end that the air tube goes over bolts up perfect in the lathe jaws. Then I just marked 62mm with a set of calipers and bored it out really slow so that it had a nice finish like that. Its not hard at all but you gotta have access to the tools. Id imagine a local machine shop would do the job for cheap as well.
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Old 12-25-2008, 01:31 PM   #27
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how the hell did you get that so smooth by the way?
First you use the rough cutter tool to get it down to size, then you use the big dremel rough sandpaper wheel to get it to be clean. Then you use the big dremel fine sandpaper wheel to clean it up some more, at last you use the polishing wheel. I could have done a better job on the polishing part but it was smooth enough and i was running out of compound so i just cleaned it up and left it
The funny thing is the black line is traced using the gasket. So even the gasket is big.

my first tool looks like this, only with bigger teeth


big dremel sandpaper wheel... you should have rough and fine...



At last the polishing wheel

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Old 12-30-2008, 10:23 PM   #28
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What size tires do you have?
32-11.50/r15 way to big for the engine and gear
s
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Old 12-31-2008, 09:13 AM   #29
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I like thats thottle body idea...I to went with air raid, thottle body spacer, exhuast, jet chip, new plugs...for a few gains.
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Old 12-31-2008, 12:06 PM   #30
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Originally Posted by GrnTJ View Post
I dont know how he did it but my buddy was gonna spend the $$ to get it done on ebay. Instead I got his and took it to the lathe in our shop at school and did the same thing for him for free. Its a little scary turning something that is so odd shapped but the end that the air tube goes over bolts up perfect in the lathe jaws. Then I just marked 62mm with a set of calipers and bored it out really slow so that it had a nice finish like that. Its not hard at all but you gotta have access to the tools. Id imagine a local machine shop would do the job for cheap as well.
How did you increase the size of the butterfly valve to match the new 62mm TB inside diameter? Did you fabricate it?

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