RAM 2500 & 3500 6.4L HEMI Tuning
RAM 2500/3500 6.4L HEMI Custom Tuning — HP Tuners & DiabloSport
N2 Speed writes custom calibrations for the 6.4L 392 HEMI V8 in the RAM truck line. Every file is built remotely around your VIN, your modification list and the fuel you actually run, then refined from your data logs. We do not sell canned maps.
RAM 2500/3500 6.4L HEMI Coverage
- 2014-2018 RAM 2500/3500 6.4L HEMI — 410 hp, 66RFE 6-speed
- 2019-2024 RAM 2500/3500 6.4L HEMI — 410 hp, ZF 8HP75 8-speed
- RAM 2500 Power Wagon — same 6.4L calibration platform
What Our 6.4L 392 HEMI V8 Calibration Addresses
We focus on torque management under load, tow-mode and grade-shift logic, the factory 87-octane spark tables, throttle response and 66RFE or 8HP75 shift firmness. Supporting modifications we routinely tune around include cold air intake, long-tube headers, cat-back exhaust, ported throttle body, camshaft packages and supercharger kits.
RAM 2500/3500 6.4L HEMI Tuning Stages and Pricing
| Stage | Built for | Typical gains | Price |
|---|---|---|---|
| Stage 1 — Stock & Minor Bolt Ons | Stock trucks and minor bolt-on builds — exhaust, headers, intakes and throttle body | 25-35 wheel hp | $450 |
| Stage 2 — Heads, Cam & Stroker | Naturally aspirated heads, camshaft and stroker builds | 60-90 wheel hp | $550 |
| Stage 3 — Complete Builds | Complete builds — supercharged and turbocharged trucks, plus a dedicated nitrous map where nitrous is used | 150+ wheel hp depending on boost level and fuel | $650 |
Stage 3 builds that run nitrous receive a dedicated nitrous map — separate timing and fuel tables for the wet or dry kit, so the truck is safe on and off the bottle.
Not sure which stage fits your build? Email your mod list to sales@n2speed.com or call (954) 406-8550 — we would rather point you to the right package than sell you the wrong one.
RAM 2500 & 3500 6.4L HEMI Factory Horsepower
| Years | Engine | Factory Horsepower | Transmission |
|---|---|---|---|
| 2014-2018 RAM 2500 / 3500 | 6.4L HEMI V8 | 410 hp @ 5,600 rpm | 66RFE 6-speed automatic |
| 2019-2024 RAM 2500 / 3500 | 6.4L HEMI V8 | 410 hp @ 5,600 rpm | ZF 8HP75 8-speed automatic |
| 2014-2024 RAM 2500 Power Wagon | 6.4L HEMI V8 | 410 hp @ 5,600 rpm | 66RFE or 8HP75 by year |
Factory ratings are SAE crank figures. All N2 Speed gains are quoted as wheel horsepower, which reads lower than crank numbers.
What Every Tune Includes
- A custom calibration written for your 6.4L 392 HEMI V8, modifications and fuel
- Optimized fuel, spark and torque management tables
- Transmission shift point, firmness and torque-limit adjustments
- Revisions after data log review until the truck runs correctly
- Optional speed limiter removal, rev hang removal and drive mode changes
- A dedicated nitrous map on Stage 3 builds running a wet or dry kit
- Direct email access to the tuner who wrote your file — not a ticket queue
Revision Turnaround
- Revisions are completed in the order they are received during business hours.
- Set time frames are available with advance notice.
- After hours and weekend revisions are done when available.
Questions? Call (954) 406-8550 or email sales@n2speed.com. N2 Speed — Pompano Beach, Florida.
RAM 6.4 HEMI Tuning FAQs
How much horsepower does a RAM 2500 6.4 HEMI make?
The 6.4L HEMI in the 2014-2024 RAM 2500, RAM 3500 and Power Wagon is factory rated at 410 horsepower at 5,600 rpm. A Stage 1 custom tune typically adds 25-35 wheel horsepower on a stock or lightly modified truck, along with sharper throttle response and better shift behavior.
How much does a RAM 2500 6.4 HEMI tune cost?
Our RAM 2500 and 3500 6.4L HEMI custom remote tunes are $450 for Stage 1, $550 for Stage 2 and $650 for Stage 3. Revisions after data log review are included.
Can you tune the transmission on a 6.4 RAM?
Yes. Every tune includes shift point, firmness and torque-limit adjustments for the 66RFE 6-speed on 2014-2018 trucks or the ZF 8HP75 8-speed on 2019-2024 trucks.
Do I need to bring my truck in?
No. Tuning is fully remote. You email your VIN, stock read, mod list and fuel type, we send the calibration back for you to flash, then you send data logs and we revise until the truck runs correctly.
