Sponsored

3.6 in ram versus jeep

Riccochet

Well-Known Member
Joined
Aug 22, 2020
Threads
3
Messages
407
Reaction score
539
Location
NC
Vehicle(s)
2012 JKR | 2020 Ram 2500 | 2021 JT Sport
Yes and no. More air in is OK if you can get it out, so you'd need to make sure the intake plenum matches as mentioned already, and a straight free flowing exhaust from the engine to tail pipe like the Ram as well. The Jeeps use a weird curly-Q bend in the exhaust.

But yeah if you did a big wide open air intake (which makes you vulnerable to water ingestion so you need to be careful) and a big wide open exhaust you'd definitely pick up power with the JL/JT version of the P-star.
Not exactly. The air is metered and controlled electronically via the throttle body. The ECU is only going to allow so much volume air in, regardless of what your right foot is doing to the peddle. You can witness this real time with something like TorquePro and a OBDII dongle. When you floor it you'll rarely see throttle position go above 70% before it comes down to about 50%.

The only way to get past that is tuning.

The longer runners in the Ram and Charger plenums increase velocity inside the plenum. Allows the air to stack up behind the valves. Same amount of metered air in, it's just moving faster. All top end gains.
Sponsored

 

hayasa

Active Member
First Name
Adrian
Joined
Nov 27, 2017
Threads
4
Messages
25
Reaction score
12
Location
Los Angeles, CA
Vehicle(s)
2015 Jeep Grand Cherokee
There was also something I remember seeing during a press piece on the Gladiator where the guy said the engine has 285hp but it was tuned for more low end torque for better off-road performance. I'd be curious to see dyno graphs of different versions of the engine.
 

KurtP

Well-Known Member
First Name
Kurt
Joined
Oct 9, 2020
Threads
68
Messages
2,310
Reaction score
2,992
Location
VA
Vehicle(s)
S/C Mojave
Occupation
Only Fans Content Creator
Intake and exhaust manifolds, per the engineers. The internals are identical among nearly all versions of the Pentastar in use.

"...there are just two head designs, two intake manifolds, and one set of internal components, including cam and pistons (this probably changed when they added the Ram setup, 305 hp, though the rep said the main advantage in the Ram was the space available for the exhaust), according to an SAE article by Paul Weissler. The Challenger's 13 horsepower increase is due to "a more aggressively designed intake air system" which increased airflow from 214 to 220 g/s."

So it has nothing to do with heads or cams or tuning. It's all because the Ram has a TON more underhood space for flowing air into and out of the engine.
and yet people say intake/exhaust cant make any power. Weird.
There was also something I remember seeing during a press piece on the Gladiator where the guy said the engine has 285hp but it was tuned for more low end torque for better off-road performance. I'd be curious to see dyno graphs of different versions of the engine.
tuning doesnt shift power from one place to another. it isn a compeomise that has to be made in the calibration. A tune is either right or it isnt, differences come from different hard parts. Unless the tune is in reference to not allowing full throttle opening.
 

KurtP

Well-Known Member
First Name
Kurt
Joined
Oct 9, 2020
Threads
68
Messages
2,310
Reaction score
2,992
Location
VA
Vehicle(s)
S/C Mojave
Occupation
Only Fans Content Creator
Not exactly. The air is metered and controlled electronically via the throttle body. The ECU is only going to allow so much volume air in, regardless of what your right foot is doing to the peddle. You can witness this real time with something like TorquePro and a OBDII dongle. When you floor it you'll rarely see throttle position go above 70% before it comes down to about 50%.

The only way to get past that is tuning.

The longer runners in the Ram and Charger plenums increase velocity inside the plenum. Allows the air to stack up behind the valves. Same amount of metered air in, it's just moving faster. All top end gains.
have you tested the JT throttle angle results And thats what you found? That would be a restriction indeed.

what tuners have the ability to allow 1:1 throttle opening without spoofing 25% pedal travel = 100% throttle? Being able to get 1:1 throttle demand is good, spoofing the pedal to make it “feel” faster is dumb....

thnx
Sponsored

 
 



Top