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Unread 02-04-2012, 10:18 AM   #1
gunnerscherlin
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EGR valve and?

So I know replacing the EGR valve will help increase the efficiency but what other valves or items can someone replace to increase power efficiency of a hemi the 5.7? Btw I have 78 k miles on it

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2005 WK Limited HEMI , 2 Hella 4000 HID SPOT, Alpine Stereo
Magnaflow Exhaust
Future Mods: OME HD, 285/70/17 Goodyear duratracs, and CAI
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Unread 02-04-2012, 10:32 AM   #2
AJeepZJ
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You're basically asking for a tune up.

EGR as stated
02 Sensors
Spark Plugs
Fuel Filter
Air Filter
PCV Valve
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Unread 02-04-2012, 10:42 AM   #3
gunnerscherlin
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O2 sensors? There is more then 1? And the pcv valve? I know these are probably simple questions Haha
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2005 WK Limited HEMI , 2 Hella 4000 HID SPOT, Alpine Stereo
Magnaflow Exhaust
Future Mods: OME HD, 285/70/17 Goodyear duratracs, and CAI
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Unread 02-04-2012, 10:50 AM   #4
AJeepZJ
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Quote:
Originally Posted by gunnerscherlin View Post
O2 sensors? There is more then 1?
Yes, there is more than 1 - I'm not sure if HEMI's have anymore than 3.7's. We have 3.


Quote:
And the pcv valve?
Yes - your crankcase ventilation. Has a lot to do with what your vehicle does with the gases after combustion.
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Unread 02-04-2012, 11:08 AM   #5
matlohemi
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If you got an extra 120$ after your tune up, buy a catch can.

It's gonna help your throttle body to stay clean.
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Unread 02-04-2012, 11:53 AM   #6
gunnerscherlin
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Well I kinda enjoy cleaning the throttle body but has anyone heard about the diablosport tuner? Would all those mods help along with the tuner
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Magnaflow Exhaust
Future Mods: OME HD, 285/70/17 Goodyear duratracs, and CAI
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Unread 02-04-2012, 12:42 PM   #7
Walt
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Quote:
Originally Posted by AJeepZJ View Post
Yes, there is more than 1 - I'm not sure if HEMI's have anymore than 3.7's. We have 3.
Yes - your crankcase ventilation. Has a lot to do with what your vehicle does with the gases after combustion.
5.7L HEMI's have 4 oxygen sensors: one before and after each catalytic converter. Use NTK (or NGK) or MOPAR OEM brand O2 sensors, not Bosch. Bosch seem to respond slower and generate DTC's. Ask 90grandoneer.

Positive Crankcase Ventilation (PCV) valve pulls vapors from the crankcase into the intake manifold for combustion. It's an emission control device to preclude smog formation.
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Unread 02-04-2012, 01:02 PM   #8
gunnerscherlin
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How much to replace all 4 sensors?
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Magnaflow Exhaust
Future Mods: OME HD, 285/70/17 Goodyear duratracs, and CAI
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Unread 02-04-2012, 01:39 PM   #9
90grandoneer
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All of the above is true. Four O2 sensors should run ~$120. If you pay someone to change them, you'll pay a pretty penny, as a couple are not easy to change. A catch can and a clean throttle body are a must, IMO. If the plugs have more than 30K on them or you don't know when they were changed last, do that too. Be sure to use a good copper core plug, not iridium or platinum. If you do the PCV Valve, install it with the valve exit hole facing rearward. This eliminates the "direct" path to the intake/catch can. I am starting to hear the new Diablosport Intune Tuner is the newest hot item. I have the "old" style DS tuner and the Superchips tuner. In any case, a tuner is a good thing, again, IMO. Both have their advantages/disadvantages. Have fun modding, working on and driving your Hemi WK.
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06 GCO, Dk Khaki, QDII, Flshing Hi 3rd Bk Lt, MDS "ON" Lt, Airtab Vortex Gens, Debadged, Fumoto Drain Valve, BT Catch Can, Chopped EGR Tube, SRT8 CAI, K&N Filter, Sonnax Trans Line Press Booster, SC Tuner W/Adv Trans Tune App, DS Tuner, Cust tubular hdrs w/3 in Magnaflow/Xlerator AP Exh Sys, Bilsteins, SRT Springs/Sways, Cust Eng Cvr, SRT8 frt/rear bumpers, FRI Sidewinder Cam/6.1 valvetrain, SLP 25% UD Pulley, BBK true 90mm T-Body, SOS Ign Coils w/.060 spark plug gaps, SRT Reps with 265/45&295/40X20's.
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Unread 02-04-2012, 02:02 PM   #10
gunnerscherlin
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Thanks man I have pretty good mechanic skills how bad are the o2 sensors to chance? And yeah I heard a lot about the diablo just want to make the right choice
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Magnaflow Exhaust
Future Mods: OME HD, 285/70/17 Goodyear duratracs, and CAI
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Unread 02-04-2012, 03:42 PM   #11
90grandoneer
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I have custom headers on mine, so they're cake. I've been told that the easiest way is to loosen the exhaust at the flanges to give you a little more room. If you can get them loose (use an O2 socket) they're then fairly easy. Apparently getting them loose and limited working space are the biggest problems. I am sure someone that has done it on a stock system will chime in and give you the complete scoop.

IMO, the DS tuner is the best overall, unless you do a lot of off roading. The SC tuner apparently has some cool off road stuff that I'll never use, because mine is lowered with SRT stuff on it. If most of your driving is in town and on the highway, the DS (and apparently now the DS Intune) is the best way to go. You can also get custom tunes done with the DS. I just took the DS off and installed the SC, mainly for the transmission features, and the fact that I haven't tried it since I put my new cam/valvetrain in. First thing I noticed is the MDS "hunts" alot and I get a fair amount of knock retard when at moderate to WOT.
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06 GCO, Dk Khaki, QDII, Flshing Hi 3rd Bk Lt, MDS "ON" Lt, Airtab Vortex Gens, Debadged, Fumoto Drain Valve, BT Catch Can, Chopped EGR Tube, SRT8 CAI, K&N Filter, Sonnax Trans Line Press Booster, SC Tuner W/Adv Trans Tune App, DS Tuner, Cust tubular hdrs w/3 in Magnaflow/Xlerator AP Exh Sys, Bilsteins, SRT Springs/Sways, Cust Eng Cvr, SRT8 frt/rear bumpers, FRI Sidewinder Cam/6.1 valvetrain, SLP 25% UD Pulley, BBK true 90mm T-Body, SOS Ign Coils w/.060 spark plug gaps, SRT Reps with 265/45&295/40X20's.
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