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  #13  
Old 02-17-2012, 04:44 PM
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Re: EGR notch on SRT8 manifolds

if I don't notch them then I won't pass emissions here, they do s sniff test.

I think I read somewhere that the EGR system helps the internal temps of the engine stay cooler or something. Who really knows what the hell it is for.... it seems like a big pain in the ass.

I'm thinking about medium size heads and a small cam.... you think I need the SRT8 intake manifold? Inertia said that their heads support EGR function, but I could never get an upgraded intake manifold to help support the mods?
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Old 02-17-2012, 06:44 PM
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Re: EGR notch on SRT8 manifolds

The EGR system is part of the emission system and is not a bad thing. It reduces oxides of nitrogen (NOx) and allows for lower combustion temperatures. The lower temps. help prevent knock retard, allowing for a little more timing to be used. This may help fuel economy slightly. Unless it is shut off via a CMR tune and a Diablosport Tuner, you'll get a Malfunction Indicator Light (MIL)> This will easily be detected during an emission test.

As long as you stick to 5.7 heads (ported/polished/big valves, etc.) you shouldn't need a bigger (6.1) intake. The 6.1 does not accomodate the EGR tube. An adapter is also needed which reduces the bigger 6.1 ports down to 5.7 size. Why?? If you're going to do that much, I'd recommend 6.1 heads, manifolds (both intake and exhaust), 6.1 injectors, and a good cam. Better yet, you may want to check the price of a complete 6.1 from Cleveland Pick a Part. It would probably be cheaper in the long run.
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  #15  
Old 02-17-2012, 08:59 PM
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Re: EGR notch on SRT8 manifolds

Quote:
Originally Posted by jeepgcoman View Post
The EGR system is part of the emission system and is not a bad thing. It reduces oxides of nitrogen (NOx) and allows for lower combustion temperatures. The lower temps. help prevent knock retard, allowing for a little more timing to be used. This may help fuel economy slightly. Unless it is shut off via a CMR tune and a Diablosport Tuner, you'll get a Malfunction Indicator Light (MIL)> This will easily be detected during an emission test.

As long as you stick to 5.7 heads (ported/polished/big valves, etc.) you shouldn't need a bigger (6.1) intake. The 6.1 does not accomodate the EGR tube. An adapter is also needed which reduces the bigger 6.1 ports down to 5.7 size. Why?? If you're going to do that much, I'd recommend 6.1 heads, manifolds (both intake and exhaust), 6.1 injectors, and a good cam. Better yet, you may want to check the price of a complete 6.1 from Cleveland Pick a Part. It would probably be cheaper in the long run.
Alot of LX guys run an 08+ mani on 05-07 platforms from the 5.7 platform as it flows better, its close to a 6.1 intake manifold. You will need the adapter for it too including the newer injectors/fuel rails. Ive had the parts for about 4 months just haven't put the new intake manifold in.

Quote:
Originally Posted by daniel7717@aol.com View Post
if I don't notch them then I won't pass emissions here, they do s sniff test.

I think I read somewhere that the EGR system helps the internal temps of the engine stay cooler or something. Who really knows what the hell it is for.... it seems like a big pain in the ass.

I'm thinking about medium size heads and a small cam.... you think I need the SRT8 intake manifold? Inertia said that their heads support EGR function, but I could never get an upgraded intake manifold to help support the mods?
Many people have disabled the EGR and passed emissions. Now you will not pass emissions if you disable your rear 02's because they wont come up as ready. If you are going to get custom tuning anyways which you will need for heads and a cam just disable the EGR. Its one less headache.

Also check out the LXforums there are a lot of people who have done what I am explaining and had great success.
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Old 02-17-2012, 10:03 PM
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Re: EGR notch on SRT8 manifolds

Viking, that would be the "Eagle" plastic manifold, right?? You need to install yours. I'd like to know how much difference it makes. Are you doing heads and cam too? I understand the new heads have the "D" shaped ports like the 6.1. Do you know if they have the bigger valves too?

I think if he used a block off plate for the EGR, he'd have a problem, but if he did it via a Diablosport CMR tune, it wouldn't be a problem. I agree, that's definitely the way to go, especially if extensive work is being done.
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  #17  
Old 02-18-2012, 11:46 AM
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Re: EGR notch on SRT8 manifolds

Quote:
Originally Posted by jeepgcoman View Post
Viking, that would be the "Eagle" plastic manifold, right?? You need to install yours. I'd like to know how much difference it makes. Are you doing heads and cam too? I understand the new heads have the "D" shaped ports like the 6.1. Do you know if they have the bigger valves too?

I think if he used a block off plate for the EGR, he'd have a problem, but if he did it via a Diablosport CMR tune, it wouldn't be a problem. I agree, that's definitely the way to go, especially if extensive work is being done.
Yes its the eagle plastic manifold which has D shaped ports. My plan was to eventually put eagle ported heads on so having the eagle manifold and SRT headers everything would match up and all I would need to do is remove the adapter on the intake manifold. The problem with running eagle heads on a pre-eagle(05-07) 5.7 is that the domes of the head have a lot less volume thus you run higher compression(not a problem if you are building a high compression engine). There are companies that reshape the dome for earlier years thus adding volume and lowering the compression. Eagle heads can be had brand new for extremely cheap as opposed to 6.1 heads. Now they flow great, more than I would need(and most people) in my opinion with ported eagle heads. So if you are on a budget its a viable option especially if you have SRT headers installed because everything will match up There are a few other changes that need to be made when switching to eagle heads too but nothing too crazy.

Non-ported stock the eagle heads flow ~300cfm which is better than pre eagle heads do stock.

Quick reference for you
http://www.magnumforumz.com/showthread.php?t=449
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  #18  
Old 02-20-2012, 07:33 PM
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Re: EGR notch on SRT8 manifolds

I'm getting my used SRT8 exhaust manifolds this weekend.... and the magnaflow SRT8 mid pipes/cats 49046 are coming in this week also. Going to run it into a duel inlet/ single outlet muffler into the stock tailpipe and resonator until I can figure out the heads and cams. When I do the heads and cams just rip off the old pipe and resonator and put on a 3 inch stainless pipe to open it to where it needs to be.

I don't want to make huge horsepower, just want to get it up to 360-380 RWHP. I think with the exhaust, heads, and cams it should run better and get somewhat better fuel economy... which over the course of the next 4-5 years could help pay for a portion of the upgrades through fuel savings. The real thing is to make it more fun to drive, and getting new heads/cams for the piece of mind that they are brand new... and not six years old.

The SRT8 intake manifold... once you put the adapter on it does it restrict it to the point where it isn't worth it? Could you just get away with a over-sized throttle body and CAI... if you keep it under 380 RWHP? Or will once again... you will have a choke point in the system.... this time being the intake manifold instead of exh. mani's? Am thinking about putting new injectors in... will 5.7 injectors be enough or are the 6.1 necessary?
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Old 02-20-2012, 07:35 PM
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Re: EGR notch on SRT8 manifolds

The Crazy Jay camshaft, 209/214.... is the one that Stu said should work for what I am looking for.
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Old 02-21-2012, 07:00 AM
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Re: EGR notch on SRT8 manifolds

Daniel, you should easily be able to get to 360-380 hp with the mods. you've indicated. With stock heads (or even modified 5.7 heads), I wouldn't recommend the 6.1 intake manifold. Consider what Viking is going to do, but include the late model 5.7 heads. Then ports match and there are no choke points. Remember that the motor is just a 5.7 liter pump and can only process just so much air (CFM)....about 600, so putting a bigger throttle body on it would be counter productive. The 6.1 uses the same throttle body, so you know it has adequate flow.

I think when all is said and done, your exhaust system will be "right on". If you don't already, get a good CAI too. I've done all that you're planning to do, except the bigger heads, and I think that my gain is in the neighborhood of 70-90 rwhp. I am guessing 30-40 for the custom tubular headers (medium length) and 40-50 for the FRI Sidewinder cam, 6.1 valvetrain, and 6.1 timing set/tensioner. The stock Hemi LX's (with a slightly better stock exhaust) usually put out ~275-290 rwhp and I figure the stock Hemi WK's to be around 265-280 rwhp, because of the more restrictive stock exhaust. Sooooo, IMO, with the heads, cam, exhaust, and intake you should easily reach your goal. Just my opinion though.

Oh, and by the way, the increased hp does help the economy too. I seldom get under 20 mpg on the highway, but in town is about the same as everyone elses....~12-15 mpg, depending on the amount of stop and go. Sure makes it fun to drive now. I just finished putting the Sidewinder in my Hemi LX this past weekend. It's really sweet. Wonder if it is still about a second faster than the WK in the quarter. I'll find out in April when the track opens. I do need to get CMR tunes on both of them now though.
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Old 02-21-2012, 07:49 AM
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Re: EGR notch on SRT8 manifolds

You think I should go with the 6.1 timing chain and tensioner? Stu said the adding the tensioner is an option that of the LX guys do... with 5.7 heads and cams should I change the chain also? What are the benefits of 6.1 timing? do you think I should put a new chain on there just to be safe or do they last a long time?

I don't want this all to be finished and 20,000 miles down the road have the timing chain go and destroy valuable aftermarket equip. I hoping to drive my Jeep another 80,000 miles or so... to around 160,000 total.
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Old 02-21-2012, 07:51 AM
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Re: EGR notch on SRT8 manifolds

I'm going to go with the DiabloPredator, and I am going to have them shut off the EGR and rear o2 sensors.... just to be safe.... don't know how those magnaflow mids are going to be... after all is said and done will have to find a AWD dyno tuning shop
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Old 02-21-2012, 12:50 PM
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Re: EGR notch on SRT8 manifolds

You don't really need to change the timing set, if you don't want to. They're the same. But, at your mileage (my WK had 63K and my LX had 49K) of over 80K, I think it might be prudent, since you're in there anyway. Inspect and determine if you want to do it. It's tougher on the WK since you may have to remove the oil pan to remove the oil pickup tube from the oil pump. I used the Crower adjustable set on both of mine and advanced the cam 2 degrees on the WK, and 6 degrees in the LX. Jury is out on it yet, since I just finished it Sunday. The purpose of advancing is to move the power/torque band to lower RPM's since that's where ~97% of my driving is. Most aftermarket cams are set up for performance and have higher RPM power/torque curves. The FRI Sidewinder is a proven (at least 5-6 years in the LX community) high torque and MDS friendly cam, and that's why I chose it. Dyno tests have shown ~40-50 rwhp increase. The cam is made for FRI by Comp Cams.

Anyway, back to the 6.1 chain tensioner.....it has 4 tensioner springs vs. only 2 for the 5.7 setup. The tensioner material is also different. If you do a search over on LXforums.com you can find some pretty graphic stories and pictures of 5.7 tensioner failures on "highly" modified 5.7's. I will say that neither of my stock tensioners were anywhere near worn too much. I've had the LX since new and it has had synthetic oil in it since 3000 miles. It showed almost no wear at all. I bought the WK with 48K on it and immediately put synthetic in it. It had about 63K on it when I changed everything, and it was worn only very slightly more than the one in the LX.

Why do you want to shut off the EGR and the rear 02's? The EGR reduces combustion temperatures and helps prevent knock retard, allowing for a little more timing. If everything is working properly, the rear 02's just monitor catalytic converter efficiency. Only reason I could see is if you removed the cats. Then you'd need to shut them off. On the Diablosport for my LX, it still has the EGR and 02 shut off features. They've eliminated those features on newer tuners (later crom files) since it shuts off parts of the emission system. If you have a new tuner you can only get them shut off with a CMR tune, which you should get anyway with the mods. you're going to do. You can run with the "standard" DS or SC tunes, but won't get maximum performance from your mods. Right now on the WK I am running the SC 91 tune with the Advanced Trans. Tuning App. It gives better control of the tranny than the DS currently does. I'll have that fixed when I reinstall the DS tuner and get the CMR tune for it. On the LX I am running a modified 93 DS tune for now, piggybacked onto the SC 91 tune. On both I've raised the rev limiters to 6500 RPM and set shift points at 6200 RPM for the WK and 6400 for the LX.
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  #24  
Old 02-21-2012, 04:34 PM
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Re: EGR notch on SRT8 manifolds

Jeepgcoman nailed many of your questions! +1 Brother

Just to hit a few others. You wont need 6.1 injectors because if you run them you will need them to remap your fuel tables it wont be "plug and play" (your stock injectors will be fine) Also running the 6.1 mani gives you more top end especially past stock red line but you will lose some in the bottom end because of its runner design.

Also something to remember if you shut off the rear 02's you will NOT pass emissions.
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