anyone?

 

i looked into this when i looked into the ho manifold and you will get soem more power but not allot. (money not worth the power gain) if you go over to the doge forums there are better ho cams out there for the 4.7 and more info for you.

i have been looking into getting more power out of my 4.7 and to spend $300 to get 5 hp is not worth it to me. if you want more power simplest thing is to get a 02 WJ with HO (not worth it for a max of 30 HP) or just get the jeepSRT8

 

just curius, the h.o. exust manifolds are different then the regular 4.7

 

The HO cams are very computer friendly and are good for nearly a +20 hp gain. You don't need to change springs assuming your mileage is not way, way up there. I'd certainly recommend some breathing options as well and a computer reprogramming, but overall this is a fantastic upgrade.

 

well my head gaskets are blown, so my heads are coming out tomorrow and being sent to the machinist for some work. for the 300 bucks it costs for the cams, im really considering doing it. my goal is not to have a racing jeep, just more pep. i already have a dynomax exhaust, looking to do the ho cams, 08+ intake manifold, k & n intake, superchips, and the transgo shift kit (ideally)

this wasnt on my immediate list, but i need my engine back up and running, so might as well start the upgrading now

 

well my head gaskets are blown, so my heads are coming out tomorrow and being sent to the machinist for some work. for the 300 bucks it costs for the cams, im really considering doing it. my goal is not to have a racing jeep, just more pep. i already have a dynomax exhaust, looking to do the ho cams, 08+ intake manifold, k & n intake, superchips, and the transgo shift kit (ideally)

this wasnt on my immediate list, but i need my engine back up and running, so might as well start the upgrading now

what's up with the 08+ intake manifold??? direct bolt on?

 

I got 23 HP on the dyno from the cams.

 

now that is very interesting!!
as there are a few guys this side that have blown HO and arent going to repair the motors!!

:cheers:

 

do they help low end torque at all? or is it all upper hp?

 

its all the way across teh board. the power gains are very linear.

 

The HO is rated at 30 hp more than the non-HO. If HO cams add 20 hp (or 23 hp) to the non-HO output, that leaves only 10 hp (or 7 hp) gains from the intake, higher compression pistons, advanced timing, and whatever other tuning is programmed into the HO PCM. Somehow that just doesn't sound right to me. I do know that dynos are not precision instruments, that results can be affected positively (or negatively) by the operators and by the conditions under which the dyno pulls were made. Horsepower ratings given by the engine manufacturer are measured at the crankshaft, and I believe people quoting shaft hp gains should probably mention what wheel hp was measured on the chassis dyno and how they estimated the shaft hp gain.

 

rm2001wj and other that always say how can you possibly gain more HP from the same HO parts that are inside an HO jeep. And the same answer can be applied to all. You guys all forget that he may have the same HO parts but his jeep is not an HO and he may have a different exhaust, different intake, different PCM tune etc etc. Those other parts are more compatible with the HO parts and squeeze those extra ponies out of them. As said above if you just put cams you may get only around 5 hp but if you start doing different mods you can easily squeeze 15-20

 

Thats what I got on the chassis dyno back in the day before I popped the 4.7 with just the cams. When I rebuilt it then I added all the goodies to it. While I only added the cams, I did have a few little problems here and there so that data could be a little skewed. Not much though.

 

The HO is rated at 30 hp more than the non-HO. If HO cams add 20 hp (or 23 hp) to the non-HO output, that leaves only 10 hp (or 7 hp) gains from the intake, higher compression pistons, advanced timing, and whatever other tuning is programmed into the HO PCM. Somehow that just doesn't sound right to me. I do know that dynos are not precision instruments, that results can be affected positively (or negatively) by the operators and by the conditions under which the dyno pulls were made. Horsepower ratings given by the engine manufacturer are measured at the crankshaft, and I believe people quoting shaft hp gains should probably mention what wheel hp was measured on the chassis dyno and how they estimated the shaft hp gain.

I've seen dyno sheets from stock h.o motors pulling 285-290 crank hp ( actually tested at the crank) I think Jeep under rated them

 

Well, you saw what you saw, so I can't argue with that. In the old days, the driver's insurance costs were said to be the reason why some of the bigger engines were "under rated" by the manufacturers. However, that reason would not be why Chrysler would under rate the power of the 4.7 HO. Are you saying that 285-290 crank hp applies to all stock HO engines, or just to some random sample? Is it possible that the regular 4.7 is under rated as well?

 

Well, you saw what you saw, so I can't argue with that. In the old days, the driver's insurance costs were said to be the reason why some of the bigger engines were "under rated" by the manufacturers. However, that reason would not be why Chrysler would under rate the power of the 4.7 HO. Are you saying that 285-290 crank hp applies to all stock HO engines, or just to some random sample? Is it possible that the regular 4.7 is under rated as well?

That's a great point. But I'm in board with you saying there's not gonna be a 20hp gain from a cam. The amount if additional add ins the H.O has is worth much more than 7-10hp

 

know that my post will take this thread even further from the original post!!

however!!


if I look at what is claimed by certain bolt on modifications, then it should not be difficult to get a normal 4.7 to the level of the 4.7HO

know that depending on where one lives(emissions issues), for example, replacing the whole exhaust system, including the removal of all the cats, and headers, the changing of the intake system including the cool air intake with the little dam wall, have read that spacer on the throttle body helps, believe that better injectors helps with millage and performance, and believe that if one had to then add the HO cams one would then have more ponies then a stock HO!!

maybe just my mad ramblings!!
just wondering how difficult it is to just change cams??

:cheers:

 

There have been people who have done before and after dyno on just the cams.

Here is one thread off of the top of my head. There are some links the 3rd or 4th post down.

A lot more info on this dodge forum than here about 4.7 engine mods.

Bottom line is that the HO cams are the best all around cam. There are aftermarket cams, but unless you are all out drag racing they aren't better than the HO's

http://www.dakota-durango.com/forum/showthread.php?t=122215&highlight=dyno

 

I wish I had 295 at the crank. Mine originally was like 195 at the wheel. :rofl:

 

No exhaust manifolds are the same.

The 2008+ intake manifold requires a special set of adapters ($$) to be able to use our drive by cable throttle bodies since the 2008 is a design both mounting wise and is drive by wire.

To date I think only one person Ryan WJ has put one in a dub. I believe that the 2008 manifold is also taller so it requires some cutting of the cowl, based on Ryan's experience during his write up.

More Dakota/ Durango guys have them installed and the general consensus is that you may loose a tiny bit on the bottom end, but then it pulls strong up to 6000 RPM. Check out the 4.7L section of the Dakota Durango forums for more info.

 

Oh and Def do the cams while your heads are out!!

 

My heads were shot so we decided to do the cam and intake upgrade.....lots of work and not sure about the exact hp gains, but I definately noticed a difference.

http://bigrubbers4x4.org/forum/showthread.php?t=1127

 

sorry if the pics don't show up, you might need to sign in. i learned alot in that build. if ya have more then 100k do the timing chain, tensioners and all it's worth it in the end, for being a tooth or less off it took me way longer then i thought and i did it twice, the 3rd time i was out of heart to finish it... it was worth it in the end. we have added a super chips tuner, and that way helped with shifting. with over sized tires, and stock gears.. you can put larger cams then factory h.o. cams then you get into pcm programing etc. for the money, if done once it's worth the final out put.

 

Thinking right now of which manifold upgrade to go with
Either all out and get http://www.airram.com/product.php?categoryid=646&productid=1296

or the 08 conversion http://airram.com/product.php?categoryid=0&productid=1334&searchquery=2008 4.7L intake adapter

also regarding the 08, it is a direct bolt on you just need an adapter for the TB to convert so that it be able to work.

 

Thinking right now of which manifold upgrade to go with
Either all out and get http://www.airram.com/product.php?categoryid=646&productid=1296

or the 08 conversion http://airram.com/product.php?categoryid=0&productid=1334&searchquery=2008 4.7L intake adapter

also regarding the 08, it is a direct bolt on you just need an adapter for the TB to convert so that it be able to work.

And possibly some cutting of the cowl to make it fit since the Jeep is much tighter than the dakota/ durango that can fit a hemi in their engine bay.

 

Precisely why i'm not sure if I want to try the 08 or not. I have the 02 HO now which is supposed to be good for an extra 5HP over the later HO manifolds.

 

C'mon man. Im waiting on you to see if I want to swap in the 08 manifold. :laugh: I got the 02 manifold in with no problems, so I will bet the 08 will go in.

 

i honestly dont know much gain the SULLIVAN manifold is over the 08 or the HO mani. But compared to the price it should be drastic. I wish there was someone on the forum that did this mod.

 

also does anybody have a tutorial on DIY swapping the cams. Or going to the shop the only way?

 

Its not that big of deal. Its maybe a weekend day project for a complete newbie.

 

This thread is 14yrs old, and that user hasn't logged in for 9 yrs.

FWIW, an SRT8 WJ doesn't exist. First year was 2005 in a WK. HO was the highest performance option for the WJ with 265hp. Yes, HO cams can be swapped in, but 2008 4.7 cams are a better upgrade as all 4.7s made 290 hp that year.

 

SRT8 WJ doesn't exist.

No, But it should have!

 

To second what Mr Bitey says, go for 08+ cams. In my 04 4.7 standard I went to HO cams which made a noticeable difference you could start to feel around 3000. I then went to cams from I believe a 2012 Ram 4.7, those improved the performance again over the HO cams as much as those did over the standard cams. Real nice kick around 3500 with no noticeable loss in low end torque. Other than those, matched injectors and a complete OEM HO air filter assembly my is stock rolling on 32" tires, I can hang with a lot of modern pickups. And I have recently showed taillights to a 5.3 Silverado, and a 5.7 Ram. IMO the late cams are the easiest most effective budget power increase one can do. The standard cams are VERY mild, it is easy to see the difference with the naked eye how much taller and flatter the lobes are on the HO and especially the 08+ ones. Not to mention the late model cams are much easier to find as every 4.7 past 08 has them vs a couple years of the HO 4.7. I forgot to add, if you go with late model cams you also have to change the tone wheel on the passenger side cam to your original one in order to keep the computer happy.