This message is for 93XJLI....Was the 63MM bored out throttle body worth the money? I have read so much about bored throttle bodies. Some good and some bad opinions. The guys who did have good things to say said it only made a minor difference in seat of the pants, power. The bored TBs I've seen run around 200-200+ dollars. Just wondering if you feel it was a worth it upgrade.

 

i just put mine in last night so not too much experience yet. but it did smooth out my idle and there is a definate increase in around town driving, no highway miles yet. i also added a 1 inch throttle body spacer while it was off so im sure that helps too. i got mine from that leigh machining, only 90 bucks and im hoping it helps with mileage too. i feel it was money well spent

 

Ehh i disagree the mods sure did help out the old Jeep alot and the people from Rusty's are nice as hell.......

 

#1

the people from rusty's provide **** poor parts and terrible service. I will not buy from there...asked a yuppie question on purpose to judge their reaction, and the guy thought he put me on hold to laugh at me to his coworkers. I will not buy from Rusty's not only because of poor service, but also poor quality of craftsmanship.

#2

cone filters are over-rated. they're more maintenance than they're worth, needing an oiling almost every oil change, and it's been proven that K&N's offer less filtration than nice factory replacements. I don't have a link to the tests backing this up, but go ahead and google it.

#3

TB spacers are a hoax. they do almost nil...going from a lousy 2.6 litres in volume (less if you have renix) to 2.7 litres in volume is NOT going to net much gain. especially with the poor airflow through the renix and 91 to mid-99 HO intakes.

so, the best and probably cheapest intake upgrade you can do is to upgrade to a mid-99 to 2002 intake manifold off of any grand cherokee, cherokee, or wrangler.

it has an interior volume of 4.3 litres, and the injectors have a higher flow rate/better spray pattern. this is approximately a 15hp gain and is bolt-on. I'm mid-swap on this myself, but here is a link to the upgrade
http://www.go.jeep-xj.info/HowtoIntakeManifold1.htm
it's a fairly straightforward swap, and you can do it at the junkyard and get the intake, injectors, p/s pulley, pump, and bracket all for under $150 if not less.

#4
exhaust is a great upgrade, but be wary. our 4.0's are naturally aspirated and do require some amount of back-pressure to run properly. so, the largest I would suggest going on your exhaust is 2.5". A header is also a good idea.

 

My 99 XJ was build in 98. So it has the inferior intake and I will gain some HP by swapping in a better intake?

Thanks

 

yes, you will gain hp by upgrading to the mid-99/2000 intake. it is more noticable on torque and when pulling than simple every day driving, according to Go-Jeep

 

strokedjeep.com - def worth the 80ish bucks (even though i got it as a gift )


i was expected to read a load of crap there, but i will agree with just about all of that.

i have this too, and i put it on with an APN header. the jeep def pulls WAAY harder past 3k now

 

not sure what you mean there , but if you're basing that opinion off of my antics over on Jeeps-Offroad.com, that's just because I don't like that forum....

 

no, its just the internet, and theres crap on it. whenever i see huge paragraphs i get ready to start blazin guns haha

 

my opinion on throttle body...
I went 12.9 @ 104 with a stock motor'd 92 5.0... stock throttle body is 60mm.
The car dyno'd 235hp and 292tq at the wheels... 60mm throttle body.
If a 60mm TB can feed 235hp and 5.0 liters, I cannot see why a larger than 59mm would be a hot ticket for the 4.0 I6.

The 2000 manifold and injectors I'm all over...

This is not a "I know everything" post, simply my obsevations, and I welcome discussion.

 

the stock TB bottle-necks down to 52ism mm at the bottom.

 

I thought stock 5.0HO was 55mm?? none the less i have a 75MM on mine now and before that a 65mm. I noticed a difference with them all... I have read up on the newer Manifold swap and was told that the increase was due to emissions and that any gain was absorbed from that....was that wrong? should i get a 99+ style manifold and injectors from the bone yard.??

 

stock mass air meter is 55mm, stock throttle body is 60mm... that is why everyone says the MAM is the bottleneck.

a simple look at the shapes of the pre-2000 vs post 2000 intakes will make you believe it works better... long arc'd runners rather than 90* tubes butted together.

 

any gain from the intake was absorbed by the mid-99 to 02 motors and their emissions. it was designed for 15hp increase on that motor to get it to be 3hp better than the HO

so, take the HO at 3hp less than the 2000 motor, and add the 15hp intake to it, and you get a 12hp gain over the 2000 motor, because you have a more easy-going emissions system

 

Hi,
I have 1989 4.0 litre jeep comanche manuel trans I want to know if I can swap throttle body to from 1991 Cherokee for more power?

Willie