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Custom Dodge Ram Performance Mods - Engine - 5.7 HEMI V8 Discuss modifying your Dodge Ram with Performance Parts and Accessories!
Factory Spec: 5.7-liter HEMI® V8 engine - 390 horsepower, 407 lb-ft of torque.


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  #1  
Old 03-04-2015, 08:12 AM
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BritMartin1052 BritMartin1052 is offline
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Default hEMI HP MODS

Hi I am new to hemi's and mods seems every where someone claims HP gains.
I am looking to add HP without too much MPG loss (if possible). This is a fun thing I am not racing just wanting to see how much gain I can get, so that said.
I have a 2013 RAM 5.7 with stock 395 HP,

If I add
A K&N 63 series CAI..
Moes 85mm Throttle body..
JBA (3") long headers..
JBA (3") mid pipes(no cats)..
A Flow master (50 HD series) exhaust..
what is the realistic HP gain I could get,
Any help here would be appreciated and any other bolt on mods you guys know off...
Also do programmers really help and what gains can I get from what programmers..
Thanks guys

Last edited by BritMartin1052; 03-04-2015 at 08:31 AM.
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  #2  
Old 03-04-2015, 12:59 PM
mikz86ta mikz86ta is offline
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If you plan on all that, yes get a programmer. But get a custom tune!
LT headers are a good investment. I'm skeptical on a larger TB because I have seen no solid dyno numbers to support and warrant the need. CAI, well that's debatable. Stock box with the intake mod and a better drop in filter will suffice. I got a S&B because I found a nice deal. No difference in mpg really, and HP I will never claim without dyno.
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  #3  
Old 03-04-2015, 01:39 PM
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Diablo tuner with a Hemifever custom tune. If you want to gain acceleration then you will need lower gears(4.10 or 4.46) and a 2800 or 3000 stall TQ.
Jay
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Old 03-08-2015, 05:26 PM
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I just installed the MOE'S 87MM T-BODY and it is nice, took me 10 minutes from start to finish. The TB adds better throttle response and quicker acceleration. I had a hard time keeping my foot from mashing the peddle today, LOL. TB worth the money in my opinion.
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Old 03-09-2015, 01:17 PM
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I'd say of those mods you listed you will see the most benefit from LT headers with a tune. You won't get much if any more power from a CAI, the stock boxes flow pretty well already.
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Old 03-13-2015, 04:51 AM
MightyAlweg MightyAlweg is offline
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I have a 2015 5.7 with about 2,500 miles on it.

I got an instant pop of power and strong acceleration on the butt dyno when I installed a 87mm TB and Vararam CAI package from Moe's Performance. That was at 1,500 miles and two months ago. Then at 2,000 miles I installed a Magnaflow Catback and had my welding guy fab up a non-restricted new Y Pipe to feed into that Catback system, the acceleration took another jump forward, but the most noticeable difference was the big reduction in throttle response time. The whole powertrain seems to breathe and flow much easier, and the 8 Speed Torqueflite loves it.

Those three mods cost me about $2,000 total including labor; I installed the 87mm TB and Vararam myself (super easy), but paid my welding guy to install the Catback and new Y-Pipe. And I couldn't be happier with the results, it's truly a bad ass truck now.

You should also consider a catch can. I installed a Billet Tech Catch Can at 1,000 miles, and I'm glad I did. I'm stomping on the throttle more, and I'm catching a few tablespoons of oil every 500 miles because of my happy lead foot.

Last edited by MightyAlweg; 03-13-2015 at 04:55 AM.
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Old 03-16-2015, 11:33 AM
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4.56---sorry, fingers got confused???
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Old 03-16-2015, 04:15 PM
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You could cam and tune it too, Hemis are relatively easy to do that to since they have a pushrod valvetrain. Don't expect the dealer to honor the powertrain warranty though.
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Old 03-17-2015, 02:06 AM
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The 4th gen hemi's are actually not easy to cam and tune. The new eagle motors being VVT makes getting a cam to be worth anything very hard and expensive. They are a bitch to tune an actually get power from and aren't worth the time so most guys don't go the cam route on the 4th gens.
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Old 03-23-2015, 08:20 AM
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BritMartin1052 BritMartin1052 is offline
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Default Mods so far

HI guys thanks for help, I still looking for any bolt on mods that will improve my HP but not kill my gas milage, any ideas this is what I have done in last few weeks:-

1.K&N 63 SERIES CAI
2.FASTMAN 85MM THROTTLE BODY
3.JBA LONG TUBE HEADERS
4.JBA 3" Y-PIPE NO CATS
5.FLOWMASTER 5OHD MUFFLER
6.DIABLO DCX1000 WITH HEMI TUNES
7.CATCH CAN

Are there any other bolt on mods I can do, I don't want to get into the engine, this is just a toy I ain't racing it..lol

Last edited by BritMartin1052; 03-23-2015 at 08:28 AM.
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