99+ Intake manifold

[Dr. Dyno]

Originally posted by JeepSpeed
One of the reasons i love DC is because they almost always deflate thier hp and torque numbers.

DC correctly rated the HP numbers of the 4.0 but they did underrate the torque by about 15lbft. The early HO 4.0 XJ should have been rated at 190hp/240lbft and the later one slightly higher, but definitely not 210hp. A '00 XJ is not quicker than a '92 XJ so I think the 210hp claim is just wishful thinking.
As for other Jeep engines, DC correctly rated the 4.7 V8 for HP and underrated it for torque, underrated the 5.9 V8 for both, and correctly rated the 5.2 V8 for both.
They didn't underrate every engine though. They somehow managed to grossly overrate the 3.5 V6 in the Chrysler 300M. They rated that one at 253hp but the performance suggests that it has about 30hp less than that.

[XJ Saga]

Originally posted by JeepSpeed
First off, sorry everyone, I prolly shouldnt be posting right now, cuz im wasted. but Maasbay, I sorry, i had no idea what u just said. If it was an insult to supin up a jeep, ford sucks man, and what's wrong with makin a 2900lb sleeper with 50/50 weight distribution? If you didnt mean anything like that, sorry. But either way, I'd still like to throw a newer manifold on, if it gets me 3 horsepower or 50. ALso, before I hit the bars=, does anyone know another place i could snatch one? I've checked Ajax multiple times, and it always says there are no matching parts. Any input(even negative) is appreciated. Muchos gracias.

JeepSpeed, I'd at least send ajax an email they'll be able to assist from there. BTW, that 3-5 extra hp that Jeep claims is from a newer H20 pump and coil on plug ignition, there is no mention of addt'l hp from the new intake/exhaust manifold but here is a quote from their literature: The new intake and exhaust manifolds enhance the sound quality of the engine and produce a lower, "throaty" sound preferred by customers.

You be the judge on what that last statement meant to indicate.

Semi OT: 300hp on the SRT-4 !! (outrageous)! Plus it's 300lbs lighter than a WRX STi. That is insane amount of power.

[REDXJ4FUN]

i'd deffinatly change out intakes just for the heck off it. and have fun.heres where i found some here http://car-part.com/ for about 35 bucks.

[CW]

I don't think the exhaust manifold would give any benefit since they switched from a tube stlye headerish manifold to a cast manifold.

[XJ Saga]

Originally posted by CW.
I don't think the exhaust manifold would give any benefit since they switched from a tube stlye headerish manifold to a cast manifold.

The newer manifold resembles a shorty header version of the Borla header for the 4.0's. Matter of fact I know a fellow street jeep enthusiast who installed a banks header on his 00 XJ and noticed very little to no improvement. He still ran a 14.7 @ englishtown raceway a few months back.

[rsalemi]

Have sold several - contact me rsalemi@hotmail.com

[Karlm]

I can vouch for rsalemi. He sold me a 99+ intake and gave me a good price too. Unfortunatly its still sitting in a box waiting to get hot-dipped and installed. What I'm really waiting for is a header so that I only have to mess with that junk once. I can't wait to get it on though.

[hjeepxj]

Originally posted by rsalemi
Have sold several - contact me rsalemi@hotmail.com

how much $?

[ryurabbit]

If you want one I can get them for $157.55 + shipping! This is for a brand new never used factory manifold!

We put one on my buddies jeep and we noticed the low end kinda went away but the 1500-4000 put you in your seat abit. He runs 35" with lockers and 4.88 gears. We didn't like the low end going away but what can you do. Also we installed the banks header at the same time so that may effect the results too.

Rabbit

[XJ Saga]

Originally posted by ryurabbit
If you want one I can get them for $157.55 + shipping! This is for a brand new never used factory manifold!

We put one on my buddies jeep and we noticed the low end kinda went away but the 1500-4000 put you in your seat abit. He runs 35" with lockers and 4.88 gears. We didn't like the low end going away but what can you do. Also we installed the banks header at the same time so that may effect the results too.

Rabbit

Hmm, I've read that before about losing power down in the low rpms but I dont have that problem. I wonder if it has something to do with your header install or just something that occurs when you install one on an older 4.0

Irregardless you are still gaining hp in the optimum rpm range, and I'd wager it's a bit more than 3hp.

[REDXJ4FUN]

I happen to be thinkin about our debate here today when one posibliity. DC may have detunde other parts of the motor to help emissions. and since they made gains in the intake they could back off the fuel and reduce emmisions.

[jack SF]

to answer czb83. the 99 intake bolts up directly to the 91-98 head. but you need the steering pump and belt tensioner out of a 95 or newer jeep. wrangler inake and pump set up works in xj too. i got a whole set up from a 2000 tj.

[czb83]

Wow, I was just about to ask about the steering pump. I went and looked intake and saw it was connected to the power steering pump.

Thanks jack SF

Maybe I'll try a junkyard for the pump and tensioner. Maybe I can find a new manifold there too. *crosses his fingers*

[Ed A. Stevens]

Originally posted by REDXJ4FUN
I happen to be thinkin about our debate here today when one posibliity. DC may have detunde other parts of the motor to help emissions. and since they made gains in the intake they could back off the fuel and reduce emmisions.

The later 4.0L HO heads have smaller exhaust ports (rumored to improve emissions), and possibly the intake and coil on plug ignition (water pump, revised exhaust, etc.) are measures to retain the power output?

The guys at Edelbrock have never designed an I6 intake (except for a manufacturer) and offer that if enough interest is communicated, they would consider a design. "Enough interest" is a few thousand requests.

[REDXJ4FUN]

An eddy intake would be nice but like you said it would take thousands of people to get them to do one. but then again they still make AMC V8 intakes and just released a new airgap intake.the only way we are going to know if the newer intake is better is to do a good soild test.