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3.7l performance love

259K views 1K replies 83 participants last post by  Tfortony 
#1 · (Edited)
Figured as the 3.7L is the underdog of the engines, and limited to after market support, it would be nice to have one thread of all available performance parts for our wk's. This will be a on goin work in progress with updates, and I need your help as im not god and don't know all. :D

PLEASE ADD TO THE LIST!

AND REMEMBER,... ALWAYS SUPPORT JEEP GARAGE VENDORS!

Throttle body:
fastman- thefastman.com
Flyinryan- flyinryanporting@gmail.com

Tb spacer:
airaid poweraid, part # 310-618 - airaid.com

Intake Manilfold:
FlyinRyan- flyinryanporting@gmail.com

Intakes:
K&N- FIPK intake, part # 63-1545 - knfilters.com
K&N- 77 series, part # 77-1545kp- knfilters.com
Injen- pf series, part # pf5010 - injenairintakes.com
AirAid- part # 310-205 - airaid.com

Tunning/chips:
SCT- email Hemifever@aol.com
SCT- FlyinRyan- flyinryanporting@gmail.com
Jet- stage 1, part # 90701 -jetchip.com
Jet- stage 2, part # 90701S -jetchip.com
Hypertech- power- part # 52001 - hypertech.com
Hypertech- econ- part # 53001- hypertech.com

CYLINDER HEADS:
Knolton thunder- economy- part# knth1-3.7l - Airram.com
Knolton thunder- race - part # knth2-3.7l - Airram.com

Pulleys:
ATI- Super Damper- OEM size (lighter) - part# 918429- atiracing.com
ATI- Super Damper- 25% UD - part# 918428- atiracing.com

Thermostat:
Jet- powertech 180 degree- part# 10177 jetchip.com

Ignition: (anything? msd??)

FUEL Injectors:
Airram- part # arpfms037- Airram.com

Headers:
JBA - jbaheaders.com

Exhuast:
Magnaflow- part # 16834- magnaflow.com
Gibson- part # 17404- gibsonexhuast.com
Gibson- part # 617404- gibsonexhaust.com
Dynomax- part # 19421- dynomax.com

Transmission:
Torque Converter:
APS- part # 37conv- apsprecision.com


Brakes:
Srt8 brakes (see sticky srt-8 conversion parts, about 6 pages deep)
See Brakewarehouse.com for a huge selection of oem, cross drilled/slotted
rotors and pads

Suspension: (i know there is alot more, add!)
See Sticky: The complete (05-10) WK Grand Cherokee suspension thread
Daystar- daystarweb.com
Rock Krawler-
Superlift-
OME-
Rough Country- Roughcountry.com

Diffs: (anyone know diffs, axles or ring and pinions)
Eaton- Detriot Locker, part # 187C179A

Diff Cover:
RuffStuff- part # 825COV- ruffstuffspecialties.com
Riddler - part # RD825- ridlermfg.com
Crane part # 8.25C- cranehiclearance.com
 
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#798 ·
When I've dropped mine I drop the pan, filter,use an empty clean pan, and after letting the trans drain until it's not dripping anymore. I drain the pan into an empty gallon container, and two quart bottles. I guess they can all be a little different mine has been six quarts that's what I put back in, and I've never had any computer messages. I have also thought about getting a stick just to be extra sure.:thumbsup:
 
#799 ·
I am deciding on one of two resontor but I would like everyones opinions on it.

The first is the solo performance resonator:



Product Steel Drain




Brush


The second is an slp performance resonator:



Automotive exhaust Auto part Muffler Cylinder Catalytic converter
 
#805 ·
I need some opinions here. As some of you may know, im gathering parts needed for a version 2 of my exhaust. I have made up my mind on muffler but I need an opinion on what to use for resonators.

I'm looking at a few brands.

Magnaflow
Solo performance
Slp

Or the other choice and the cheapest is keep the thrush glass pack or just replace with new ones.

The magnaflow and thrush are perforated and the slp and solo are louvered.

Whatcha guys think will give the best sound when paired with magnaflow mufflers?
 
#806 ·
I need some opinions here. As some of you may know, im gathering parts needed for a version 2 of my exhaust. I have made up my mind on muffler but I need an opinion on what to use for resonators. I'm looking at a few brands. Magnaflow Solo performance Slp Or the other choice and the cheapest is keep the thrush glass pack or just replace with new ones. The magnaflow and thrush are perforated and the slp and solo are louvered. Whatcha guys think will give the best sound when paired with magnaflow mufflers?
Perforated will flow better than louvered. Louvered will also cancel the noise and I don't think that would be an optimal pair up with the manga flow mufflers. Therefore I have to say magnaflow resonator.
 
#821 ·
i got some mods planned to really help the 3.7 out in a few area's. Ease of rev, power delivery, throttle response and fuel efficiency. all together should pick up nearly a second in 0-60...hoping to break into the 6sec range. the details will come in due time... until then its my secret

let the guessing game begin lol
 
#823 ·
#825 ·
Back around 03 or so. Kenne bell was developing a s/c kit for the 3.7 on six pounds and it blew after a few dyno runs. Put down 302 before it went. Kenne bell had bigger injectors and tune to go with it. After it blew they torn it down and discovered that the ring lands broke off from being too high up on the pistons.
 
#826 ·
Thats a shame. I would love to have a roots blower pushing 6psi of boost. I had the same issues on an 03 Tiburon that had an Alpine (eaton) supercharger insalled. The piston rings were also close to the top of the piston. 4-6 psi was a safe zone and anything above that was asking for problems (as far as longevity and reliability). The car still made 257fwhp @ 6psi (172 stock) and was a blast to drive.
 
#827 ·
Well I know where to get internals for us. Granted there 4.7 parts but in the very least we can get pistons. The factory rods should be able to handle 8psi.
 
#829 ·
As long as the piston diameter is the same it shouldn't matter. You can make a 426 into a 440 just by changing the crank. Same with a 6.1-6.4. It's all about the stroke. Still it's going to be a uphill battle. Performance wise the focus was the SRT. There really isn't even a lot of options for us.
 
#830 ·
True but I cant increas displacement by changing cranks. No one makes an after market crank or cam for that matter on the 3.7. But I can get better pistons from and rods from a 4.7. You guys have way bigger of a aftermarket
 
#834 ·
Pistons/Rods:
they can be found at airramperformance.com. they are listed under 4.7, but they will fit the 3.7. the rods are a hair longer then oem so you will need to lower the CR using pistons that have lower CR. (compression ratio). New bearings I definitely recommend. One detail that differentiate the 3.7 and 4.7 cranks is that the 3.7 has a slightly longer stroke then a 4.7, thus the need for lower CR pistons.

Ignition:
WeaponX has just recently released a set of stage 2 ignition coils, they claim a 30% increase over stock.

Fuel system:
also found at airram, the stinger brand injectors. they have up to 43# injectors. stock on a 3.7 are 21.5#, im running 26# from a mustang cobra. (better spray pattern and better flow up top)
I need to do some more research on what the fuel flow rate is on the factory fuel pump, and see if I can find a suitable one from walboro...

Tuning:
Ah tuning, this is the most difficult part. there is barely and tuning support on the 3.7 and finding a tuner willing to play with the 3.7's NGC ecu is gonna be hard. did some digging around on motec's site for a stand alone, but don't think any thing will work. same for aem. a standalone will need to be can-bus compatible...

Transmission:
Well the 3.7 is paired up with the NAG1/W5A580 from the SRT. it has a different tune then the srt tho. again it comes down to a tuner willing to play with the ecu/tcm. It SHOULD BE capable of handling whatever a boosted 3.7 can throw out. same trans has seen up to 600HP in srt's although some transmissions have died at power levels a little higher then stock in the srt.

If you get all that sorted out, I believe a properly setup and tuned turbo 3.7 could generate 400-550 on 8-12 psi of boost.
 
#852 ·
To Update the current parts list AVAILABLE to us, not custom done like a few of mine.
Items in red are new guys:

Throttle body:
fastman- thefastman.com
Flyinryan- flyinryanporting@gmail.com

Tb spacer:
airaid poweraid, part # 310-618 - airaid.com

Intake Manilfold:
FlyinRyan- flyinryanporting@gmail.com

Intakes:
K&N- FIPK intake, part # 63-1545 - knfilters.com
K&N- 77 series, part # 77-1545kp- knfilters.com
Injen- pf series, part # pf5010 - injenairintakes.com
AirAid- part # 310-205 - airaid.com

Tunning/chips:
SCT- email Hemifever@aol.com
SCT- FlyinRyan- flyinryanporting@gmail.com
Jet- stage 1, part # 90701 -jetchip.com
Jet- stage 2, part # 90701S -jetchip.com
Hypertech- power- part # 52001 - hypertech.com
Hypertech- econ- part # 53001- hypertech.com
Sprintbooster, Quadratec Part No: 17616.0001 Quadratec.com

CYLINDER HEADS:
Knolton thunder- economy- part# knth1-3.7l - Airram.com
Knolton thunder- race - part # knth2-3.7l - Airram.com

Pulleys:
ATI- Super Damper- OEM size (lighter) - part# 918429- atiracing.com
ATI- Super Damper- 25% UD - part# 918428- atiracing.com

Thermostat:
Jet- powertech 180 degree- part# 10177 jetchip.com

Ignition:
WeaponX Level 2 Coils P/N:ICK6602
Dodge /Jeep /Mitsubishi V6 Level 2 EFX Direct Fire Super Coil Ki Dodge /Jeep /Mitsubishi V6 Level 2 EFX Direct Fire Super Coil Ki [ICK6602] - - It's Free! : WeaponX Performance Products LTD., High Performance Ignition Equipment

FUEL Injectors:
Airram- part # arpfms037- Airram.com

Headers:
JBA P/N: JBA-1930S
Found at summitracing.com

Exhuast:
Magnaflow- part # 16834- magnaflow.com
Gibson- part # 17404- gibsonexhuast.com
Gibson- part # 617404- gibsonexhaust.com
Dynomax- part # 19421- dynomax.com

Transmission:
Torque Converter:
APS- part # 37conv- apsprecision.com


Brakes:
Srt8 brakes (see sticky srt-8 conversion parts, about 6 pages deep)
See Brakewarehouse.com for a huge selection of oem, cross drilled/slotted
rotors and pads

Suspension: (i know there is alot more, add!)
See Sticky: The complete (05-10) WK Grand Cherokee suspension thread
Daystar- daystarweb.com
Rock Krawler-
Superlift-
OME-
Rough Country- Roughcountry.com

Diffs: (anyone know diffs, axles or ring and pinions)
Eaton- Detriot Locker, part # 187C179A
Detroit Tru-Trac LSD-913A553, rustiesoffroad.com
Yukon Gear 3:73 ring/pinion set-YG C8.25-373 ringandpinion.com

Diff Cover:
RuffStuff- part # 825COV- ruffstuffspecialties.com
Riddler - part # RD825- ridlermfg.com
Crane part # 8.25C- cranehiclearance.com

I will add more to the list as I research and mod my own 3.7
 
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#854 ·
This is all great information. Is anyone on here have any performance parts they are willing to sell. Right now all i have is a flowmaster 50 series on Jeep.

Thanks
Sorry bro, I don't have nothing F/S at this time, but I can help you find parts if ya need it. :thumbsup:
 
#856 ·
Need some opinions.... So im looking to get just a muffler that will sound good on my 3.7. But not too loud. Ive been hearing from a lot if people that magnaflow is what I'm looking for. So i went over to this custom exhaust place who gave me a quote of 130 for the muffler and install. What do you guys think? Should i got for it or do you think it'll be a waste if money?


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