5.7 HEMI Mod - Advise Appreciate

[La Ramie]

Since I have another tick issue with my Ram 5.7, so I'm planning the next:

Ram 6.4 Intake Manifold
Ram 6.4 MDS lifters and pushrods
Ram 6.4 Cam
6.4 fuel injectors
Ported TB
VVT and MDS solenoids replacement
BBK shorty
Custom True Dual Exhaust w/ Muffler delete
Hemi Fever Tuning
All consumables replacement (Gaskets, belts, spark plugs, etc)

Please let me know if I need to include something else.

 

[DILLIGAF]

No one does 6.4 cam anymore. Just get a proper cam from Moes / Jay / Flyin' Ryan

And why on earth do you want to do MDS lifters ? thats insane . Just do MDS delete and Hellcat lifters.

Buy the 6.4 adapter and run a Hellcat TB

 

[Dan Topp]

Just beg borrow or steal and do a blower.It took a lot of N/A builds before I was converted. No cam .same quiet/sneaky exhaust sound.Now on to what we will all eventually need,a snow or alky systems methanol kit..So many wasted parts time and WHP

 

[Jwithing]

I'd also recommend going long tubes over the BBK shorties. Specifically stainless works if you want true dual.

Agree on the cam recommendation and absolutely delete mds.

You can also do intake, 180 thermostat, v6 efan conversion and clutch fan delete, underdrive pulley, and torque converter.

Depending on miles, may be wise to do maintenance items while you're swapping cams such as water pump, oil pump, timing chain, etc.

 

[La Ramie]

The reason for going 6.4 cam and MDS is to keep as close to stock as possible since it’s my DD truck.

I’ll be doing oil pump change, transmission and diffs maintenance but the water pump was already changed less than 2 years ago.

I might do a Procharger down the road once I finish the initial off-road build on this truck.

 

[jws123]

Makes no sense to change the cam lifters and keep mds it saves no gas at all only causes bs its a failed design. In fact removing mds makes the value of your truck go up people always asked about mds when I sold my last 2 trucks.

 

[Nick@GotExhaust]

I would do long tubes, and as mentioned below if you dont want a y pipe configuration do the Stainless works "power connect", it is an x pipe configuration. If you are dead set on shorties do not do BBK, do AFE or Kooks or worst case JBA.

message me for a quote on anything. We would be glad to help

 

[La Ramie]

I went with BBK shories because I want to keep the stock cats and it's the only one with 1-3/4" primaries.
I would have went with SRT headers if they'd have fit.

This is my 2nd MDS lifters replacement after more 310k miles. My first one was around 70k miles.

 

[Nick@GotExhaust]

I went with BBK shories because I want to keep the stock cats and it's the only one with 1-3/4" primaries.
I would have went with SRT headers if they'd have fit.

This is my 2nd MDS lifters replacement after more 310k miles. My first one was around 70k miles.

If your keeping the stock y pipe in place the primary size isnt going to matter all that much. The stock Y pipe is a major restriction. If I went shorties I would rather stick with a quality header over gaining an 1/8th" in primaries feeding a ypipe. There has been a bunch of instances where welds crack on the BBKs. If it wont be daily driven it should be ok for a while then.

Since you are going with Hemi fever, if you havent already I would talk to your tuner about your set up. A quality customer tuner knows what works and what isnt really worth the money. They may be able to steer you in the right direction for your wants and needs within your budget.

 

[Bigskyroadglide]

The reason for going 6.4 cam and MDS is to keep as close to stock as possible since it’s my DD truck.

I’ll be doing oil pump change, transmission and diffs maintenance but the water pump was already changed less than 2 years ago.

I might do a Procharger down the road once I finish the initial off-road build on this truck.

I daily drive a supercharged 5.7 hemi. Your logic is odd, but your $$ your time.

Anything can be daily driven,, even a super car

 

[La Ramie]

If your keeping the stock y pipe in place the primary size isnt going to matter all that much. The stock Y pipe is a major restriction. If I went shorties I would rather stick with a quality header over gaining an 1/8th" in primaries feeding a ypipe. There has been a bunch of instances where welds crack on the BBKs. If it wont be daily driven it should be ok for a while then.

Since you are going with Hemi fever, if you havent already I would talk to your tuner about your set up. A quality customer tuner knows what works and what isnt really worth the money. They may be able to steer you in the right direction for your wants and needs within your budget.

The exhaust past the shorties will be changed as well. Magnaflow Hi-flow cats, x-pipe and 2.5" dual pipes.

 

[Nick@GotExhaust]

I went with BBK shories because I want to keep the stock cats and it's the only one with 1-3/4" primaries.
I would have went with SRT headers if they'd have fit.

This is my 2nd MDS lifters replacement after more 310k miles. My first one was around 70k miles.

The exhaust past the shorties will be changed as well. Magnaflow Hi-flow cats, x-pipe and 2.5" dual pipes.

Oh sorry, I got confused since you mention you want to keep the stock cats...so why not go long tubes?

 

[La Ramie]

Oh sorry, I got confused since you mention you want to keep the stock cats...so why not go long tubes?

Went with shorties for a better low to mid-RPM torque, which is more useful for me as a daily driver

 

[Wild one]

Went with shorties for a better low to mid-RPM torque, which is more useful for me as a daily driver

You got that back asswards,shorties don't create torque.That's an old wifes tail,long tubes are what you want ,if you want bottom end torque.The shorter the primary pipe,the more focused the horsepower and torque will be in the upper rpm range,the longer the primary pipe,torque is more focused down low.Same principle as your variable length runner intake manifold.The longer intake runners are activated off idle to roughly 4,000 rpm,then the intake manifold switches over to the shorter runners.A little research on google would of clued you in the differances between shorties and long tubes.

 

[Dan Topp]

I was given the same advice about wasting time and money on a HCI mod and didn’t listen so I wound up canning the vararam changing the cam injectors tune(3rd time on dyno)and fuel pump.I think the experience was fun only because I have more money then brains,and not a lot of time left to spend it.There is a part I forgot about the clutches or in our case the hp70 or 90s torque rating and everything that my 6600 lb slug destroys after that.

 

[Dan Topp]

I requested long tubes and a true dual exhaust,partly for performance since a cat delete will kill off anything living in the garage and to get rid of the manifolds and their bolt breaking issues.Now that will be a cool project considering what passes for dual exhaust on the rams.Not expecting akrapovic to have this in stock.

 

[La Ramie]

You got that back asswards,shorties don't create torque.That's an old wifes tail,long tubes are what you want ,if you want bottom end torque.The shorter the primary pipe,the more focused the horsepower and torque will be in the upper rpm range,the longer the primary pipe,torque is more focused down low.Same principle as your variable length runner intake manifold.The longer intake runners are activated off idle to roughly 4,000 rpm,then the intake manifold switches over to the shorter runners.A little research on google would of clued you in the differances between shorties and long tubes.

One of us got it backward.
Longer primary will have less back pressure than shorter primary piping, thus less low end torque.

Short Tube vs Long Tube Headers - Which is Best for Your Exhaust? - TDotPerformance.ca’s Red Line

You don’t need a fancy engineering degree to know that the first stop for exhaust gases exiting the vehicle’s engine is the headers. So, it’s no surprise that your headers’ design and makeup are key factors in your vehicle’s overall performance at varying RPMs. And choosing the perfect headers...

blog.tdotperformance.ca

There also several YouTube videos talking about the same thing.

 

[crackerjack1957]

Rick is correct & you are wrong.......not everything on the net is correct.....shorties make more top end power compared to stock manifold.....longtubes make more torque/power than shorties throughout the powerband.....dyno test proves.....
smaller primary tubes or stepped tri-y move torque/power down in lower RPM.
The different merge points for the two types of headers result in performance variations because the merge point directly affects back pressure in the intake-exhaust system. Back pressure from exhaust gases reduces the ability of the engine to take in fresh oxygen, which limits engine horsepower and torque. Consequently, the farther out the merge point of the pipes, the lower the back pressure, the greater the oxygen intake and the greater the resultant horsepower, which gives significant power advantage to the long tube style.

Now it you keep the stock cats & exhaust.......sure go with the shorties.

Ford 351W Dyno Test: Shorty Versus Long-Tube Headers

The efficiency of long-tube headers over shorty headers is demonstrated on the dyno with 16 more HP and 16 lb-ft of torque on a mild 351W Ford small-block.

www.motortrend.com

Headers Dyno Test - Popular Hot Rodding Magazine

We dyno test six sets of headers to explore how different parameters can change your engine’s performance

www.motortrend.com

 

[Wild one]

One of us got it backward.
Longer primary will have less back pressure than shorter primary piping, thus less low end torque.

Short Tube vs Long Tube Headers - Which is Best for Your Exhaust? - TDotPerformance.ca’s Red Line

You don’t need a fancy engineering degree to know that the first stop for exhaust gases exiting the vehicle’s engine is the headers. So, it’s no surprise that your headers’ design and makeup are key factors in your vehicle’s overall performance at varying RPMs. And choosing the perfect headers...

blog.tdotperformance.ca

There also several YouTube videos talking about the same thing.

Read Johnnies link closely,this part will make you see the light.Also you might want to track down Matt Fikac on either High Performance Rams or Tuned Rams on facebook,and ask him about his tests regarding shorties versus long tubes on a truck
It's pretty commom knowledge that long tubes out perform short tubes from idle on up on the late model trucks that utilize VVT and variable intake runners


"As the numbers show, there was quite a lot of power to separate the various header configurations, with as much as a 39hp spread in peak-to-peak horsepower, between the shorty header and the best performing long-tube, the 2.00-inch. The shorty header certainly did not provide the same exhaust tuning and scavenging effect of any of the long-tube headers, with a significant loss in torque and power throughout the curve."