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  #25  
Old 11-25-2009, 05:04 PM
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Re: Gains/Losses w/SRT exhaust on WK 3.7?

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Originally Posted by B.P.O.D View Post
timmy - sitting in the back seat is very different!!! i just tried it and i was like HOLY CHIT its LOUD back here lololol... needless to say i'll be doing some work in the rear cargo in the spring
I went crazy with soudproofing, and still not done all i want to do. I completely filled the cargo door frame with spray foam, covered the cargo floor pan with several layers of peel n stick membrane, spray foamed the framing behind the bumper, and shoved mineral wool insulation behind the plastic interior fender panels back there. I still want to undercoat the car, pull the seats and install peel n stick membrane on the floor boards under the carpet, and undercoat the wheel wells. I have a huge roll of lead I was thinking of laying under the front and rear seats too. I have access to waterproofing peel n stick membrane free from construction sites I have visited for work, so I have stock piles and it acts the same as Dynamat.

I have a full roll of it I can send you for just shipping cost if you want, goes for about $80 cost. Can do your whole cargo and floor area with a few layers of it with the amount thats on it. Its an asphalt based membrane so its not ideal for vertical applications like doors because it does get soft in high temps, but perfect for horizontal applications like floors.
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  #26  
Old 11-25-2009, 05:25 PM
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Re: Gains/Losses w/SRT exhaust on WK 3.7?

timmy that would be sick bro!!! call me and we can discuss this more in depth... i def need to insulate!!!
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  #27  
Old 11-25-2009, 05:46 PM
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Re: Gains/Losses w/SRT exhaust on WK 3.7?

Here's a cut sheet on the membrane.

http://www.chasephipps.com/documents...TWF%20Data.pdf

Its a 12"x 50' roll I believe or 100'. Its been in my basement for awhile now, and I have so much more other rolls I was just going to throw it out since im moving soon. I've used this over my cargo floor, used 3M spray glue to make it stick down really good.



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  #28  
Old 11-26-2009, 12:17 AM
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Re: Gains/Losses w/SRT exhaust on WK 3.7?

that stuff looks good bro!!! i'll def take that from you!!!
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  #29  
Old 11-26-2009, 01:02 AM
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Re: Gains/Losses w/SRT exhaust on WK 3.7?

I'm definately not trying to argue but i do speak from personal experience and have had a few mechanic friends confirm the idle issues. Nothing major mind you but just a rougness to the idle that wasn't there before. I do agree that it sounds like a maf issue but obviously can't be-but what we do know is that a MAP (aka:speed density) system is less tolerant of mods and combined with the down right anal-retentive computer systems on these jeeps, could contribute to an issue.

Oh, and Timmy,to answer your questions:

A) No
B) No
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  #30  
Old 11-26-2009, 12:02 PM
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Re: Gains/Losses w/SRT exhaust on WK 3.7?

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Originally Posted by 05wkguy View Post
I'm definately not trying to argue but i do speak from personal experience and have had a few mechanic friends confirm the idle issues. Nothing major mind you but just a rougness to the idle that wasn't there before. I do agree that it sounds like a maf issue but obviously can't be-but what we do know is that a MAP (aka:speed density) system is less tolerant of mods and combined with the down right anal-retentive computer systems on these jeeps, could contribute to an issue.

Oh, and Timmy,to answer your questions:

A) No
B) No

I wasn't implying that you were trying to argue- I don't know if I came off that way, but if I did it wasn't intended. I think this is a great discussion so far.

Most of my experience has dealt with speed density systems in general so I can't confirm this detail, but I have heard that MAF systems are much more dependent on custom tuning. Since a MAP system is dependent on reading pressure, it typically has some "wiggle room" , because pressure in most cases does not change a great deal. Airflow (read by a MAF system) is a different story, it would seem.

The way I see it, the greatest concern with MAP systems the idle/low speed areas of the tune. For example with a big cam the vacuum drops greatly and MAP voltage fluctuates due to overlap/reversion etc.

The computers themselves are not really the problem. You see, GM and Ford tend to share their programming language with the aftermarket. DCX on the other hand does not, which means that any company looking to market a DCX tuning product, they literally have to basically "translate" tons and tons of code. It's reverse engineering to the nth degree. Because of the various revisions of the PCM over time (JTEC has 16 revisions alone) it's an enormous task. This is why we do not have full tuning capability.
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  #31  
Old 11-26-2009, 12:19 PM
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Re: Gains/Losses w/SRT exhaust on WK 3.7?

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Originally Posted by TimmyB View Post
I understood most things you said, not sure what NGC and JETC/JETC+ is though. Basically what I think you are saying is my cars PCM does not have the ablity to adapt that much from stock settings?? And if so would a flash help, or anything else for that matter? Like I said before, I dont plan on doing anything else to the motor but want what I have done to it working in "perfect" order if possible. This is the first vehicle I have ever done mods to, and have always had great luck with my previous cars running great and lasting long with just the basic oil changes and minor repairs.
NGC/JTEC are the "languages" of the PCMs since 1996. Well, technically they are two different types of controllers.

What you think I am saying is correct, the PCM has a limited ability to adapt to any kind of modification. It can adapt to weather changes, but anything beyond that it only has a partial understanding of whats going on.

A PCM flash/tune is set to a specific set of mods. If anything it's configured to adapt LESS than a stock calibration (to minimize torque management, performance loss due to heat soak, etc).
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  #32  
Old 11-26-2009, 06:07 PM
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Re: Gains/Losses w/SRT exhaust on WK 3.7?

Thats odd, I was googleing something just yestarday and I came across an article on heat soak, but I just started to read it then had to leave.

And I will be 100% honest in that now I do experience a slight rough idle from time to time, I notice this when im sitting in my car with it running during lunch break for awhile, but doesnt last and its very minimal. Seems like the rpm's get low. Its nothing major, and maybe it even happened before and I just never noticed it. Im going to really start paying attention when im driving so I can tell in detail exactly what its doing, but it seems the low end isnt as good now but the highend is better.
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  #33  
Old 11-26-2009, 08:32 PM
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Re: Gains/Losses w/SRT exhaust on WK 3.7?

jeep sare notoroius for rough idles in the lower rpm's while idling. My 4.7 did it from the time it had 7 miles and no mods
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  #34  
Old 11-27-2009, 12:17 PM
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Re: Gains/Losses w/SRT exhaust on WK 3.7?

^ mine has been doing it lately ... thought I was going crazy good to know I'm not the only crazy one
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  #35  
Old 11-27-2009, 01:07 PM
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Re: Gains/Losses w/SRT exhaust on WK 3.7?

There are several reasons as why you may have a rough idle...in some cases it is part of the PCM calibration (low idle saves gas), in others it is due to a clogged/gunked up IAC valve.
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  #36  
Old 11-27-2009, 02:59 PM
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Re: Gains/Losses w/SRT exhaust on WK 3.7?

Whats an IAV valve? When I start my WK the rpm's are high, around the 1k mark. Then after just sitting there on lunch break it goes down to about 500rpm and stays, idle seems to be fine but once in awhile it will drop below that and appear rough for a minute or two then go up again. Im not concerned really and prob think its normal, but if there's something I can clean to help it i'd do it. I do have the K&N CAI and people have told me the oiled filters can screw up the intake parts from the oil being sucked in, but im very careful to only add enough oil on the filter during cleaning so its not sloppy soaked with the oil, if anything I dont put enough on.

I have a can of Gumout air intake and throttle body cleaner, would it be good to remove the intake tube and spray some into the TB?
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