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Discussion Starter #1
Hello my fellow jeep freaks am very new to the forum just wanted to know if anyone else has had the Comp Cam 260 installed it there Jeep WK 5.7 Hemi and custom dyno tuned results??? I just had mine installed three weeks ago and the numbers seemed kinda low best run was 292 hp and 322 for tq awd dyno, mods that were installed with the cam were k&n intake comp 260 cam and custum true dual exhaust side ext. Thanks for any responses! :D
 

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Discussion Starter #2
Anybody out ther?
 

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The Original
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Yeah that seems low. THat means time to upgrade to Big Valve Premium Heads!

Did you get a CMR Tune?
 

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Discussion Starter #4 (Edited)
Yea i had a custom tune after the CAI, Cam and custom exhaust just dosent seem right... Im still running the stock ''log'' exhaust manifolds but with the cam offering 31hp and 20 tq and the custom tune anded 20 more hp and 30 tq I really figuered that she would be putting more "ummpth" at the tires. I dont know what the est drive train loss would be in a QDII? but the custom shop said it should be pumping out about 382 hp at the crank and 429 ftlb tq... Agian just doesnt add up to me it got me and my buddies thinking that mabe they never installed the Comp cam and just gave it a custom tune.:mad::mad::mad:
 

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Discussion Starter #5
Also anybody install a cam with similar specs have any dyno numbers in a jeep 5.7 hemi QDII?
 

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I think you lose 20% or 25% through the drive train. If you think they didn't put your cam in.... Check your radiator and fan for signs of being uninstalled, they both have to come out for the cam to be pushed in. The fan has brass fittings that connect the power steering fluid, these would show tool signs if they removed them.
 

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Discussion Starter #7
Thanks man,Yea I have checked the oil filter and it is one that the custom shop installed but I have not checked the the brass fittings yet but i will when i get off today It's a real bummer that the comp cam 260 dosent idle choppy to know that the cam was installed or not... :confused:
 

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I think your cam in comparable to mine... And I don't have a choppy idle... To be honest... A air intake doesn't really do very much... And your exhaust is still restricted like all hell at the manifolds. If it was tuned properly they probably couldn't open up the fuel as much as you could because of your restricted exhaust system. Think of it this way, even though you are holding your intake and exhaust valves open longer, what difference does it make if they are breathing through a straw. A cheaper alternative to srt8 exhaust manifolds may be to go with the lx logs that have much more flow, and you will be the first person to try to install them... they may have frame rail clearance issues, they may not. As of right now, your baby jeep manifold logs are killing your high end horsepower. The stock heads are good for more flow, but those logs are not a performance part.
 

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Discussion Starter #10
Thanks for the response I was trying to get my hands on some used jeep srt 8 manifolds but I couldnt find any in two months berfore the cam install and the price for new oem manifolds are very expensive I didnt know if the CMR tune was done in 3rd gear were the jeep had the least amount of kick down power or what... Does anybody out there installed the LX manifolds and seen a performacne gain? Theres only a few exhaust shops were I live and all of them cost a pretty penny for headers installs. I think im kinda S.O.L right now...:mad:
 

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Discussion Starter #11
Sorry I diddnt see that you said that I would be the first to try the LX logs... If I cant get ahold of the srt manifolds.
 

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And your exhaust is still restricted like all hell at the manifolds. If it was tuned properly they probably couldn't open up the fuel as much as you could because of your restricted exhaust system. Think of it this way, even though you are holding your intake and exhaust valves open longer, what difference does it make if they are breathing through a straw. As of right now, your baby jeep manifold logs are killing your high end horsepower. The stock heads are good for more flow, but those logs are not a performance part.
Dan is 1000% right. A good complete header back exhaust is a must, and should be installed before or at the same time as the cam to get the full benefit of the cam. I had my header back exhaust done about a year and a half before I did my cam. Just the cam alone (with a good exhaust) should be worth ~40-50 rwhp and a good complete exhaust should be worth ~20-40 rwhp. Also, like Dan said, you'll lose more through the 4WD than with a 2WD vehicle. Your current dyno readings are just slightly above a stock Hemi LX vehicle which normally run in the neighborhood of 280 rwhp.

Here's a few pix of the stock Hemi WK exhaust log and the stock Hemi LX log; the stock Hemi WK log collector and my header collector; and finally one of my completed headers. You'll be amazed at what a difference it'll make.
 

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Jeepgcoman those headers are sweet... Man I wish I had a good metal fabricating company around when I wanted headers... They must flow better than the 3-1 srt8 manifolds. Do your headers have an egr passage? If so... I'm wondering how exhaust gases get fed into the egr when the second cylinder is the mds cylinder?
 

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I don't believe the stock LX aftermarket headers will fit without some modification. When my exhaust guy built mine, one of the things he considered doing was getting a set of JBA LX headers (that's what I have on my LX) and cut them up to make them fit the WK. One other suggestion someone came up with it to try a set of Durango 5.7 headers. Don't know who makes them, but somewhere on one of these forums there is a picture, and they look like they might fit. The stock LX logs should bolt right on, but you'll need to make head pipe (Y) mods. (LX's are about 3/4 in. bigger collector) to get that to fit.


Dan, the EGR setup is similar to the stock logs, except it's external. No problems at all with it, but I told the guy to make sure the passage would flow enough so it worked properly. The tube he welded onto the header is approximately the same size as the hole in the head leading to the EGR Valve. Here's a couple more pix.
 

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I don't believe the stock LX aftermarket headers will fit without some modification. When my exhaust guy built mine, one of the things he considered doing was getting a set of JBA LX headers (that's what I have on my LX) and cut them up to make them fit the WK. One other suggestion someone came up with it to try a set of Durango 5.7 headers. Don't know who makes them, but somewhere on one of these forums there is a picture, and they look like they might fit. The stock LX logs should bolt right on, but you'll need to make head pipe (Y) mods. (LX's are about 3/4 in. bigger collector) to get that to fit.


Dan, the EGR setup is similar to the stock logs, except it's external. No problems at all with it, but I told the guy to make sure the passage would flow enough so it worked properly. The tube he welded onto the header is approximately the same size as the hole in the head leading to the EGR Valve. Here's a couple more pix.
Whats your exhausts Guys name and number?
 

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His name is Tom Ammerman. Tell him Adrian referred you....maybe not though! He may double the price, LOL. Seriously, if you call him and he sounds interested, tell him I'd be willing to take my WK back in so he can spec. the headers. I know he was a little bummed after doing mine....lots of tight, difficult work and fitting.

Boise Auto Repair and Car Repairs @ Ammerman's Custom Exhaust
 

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Discussion Starter #18
Awesome please tell us how it turns out with contacting the exhuast guy and if he id intrested in building another set I would be very intrested also...:cool:
 

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What's a hemi LX log usually found on guys, I'm new to the forum and to the jeep world. I live in australia and I just bought an 06 grand cherokee 5.7. I've put a custom exhaust on it (a friend owns a shop) and when I asked about headers he said my manifold had a HUGE outlet on it. So I think I may hav the LX log type manifold on mine. I've just put a K&N intake on it and have ordered a Diablo trinity that should arrive soon. Can't wait to put her on the dyno. :D
 

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That would be cool if your jeep accidentally had lx manifolds put on it from the factory... which is unlikely since they arent going to fabricate your jeep with special mid pipes. One way you can tell is if your mid pipes have been welded on and changed at the flanges, maybe the previous owner had them changed. Search back through the threads, jeepcogman has posted pictures of srt8 manifold vs jeep log vs lx log.
 
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