Specificatiosn: 3MO NTX Transaxle Sequential Gearbox | HGT Engineering

SPECIFICATIONS

 

3MO NTX TRANSAXLE SEQUENTIAL GEARBOX

Torque 500 Nm / 370 lb-ft

TX 500 Drop Gear 6 Speed

OVERVIEW

 

The 3MO NTV Transaxle Sequential Gearbox has been designed for Sports Car Gt - LMP type endurance racing in longitudenally mounted mid engined race cars.  The 6 Speed Sequential Gearbox has been in production since 2018 and run in class racing like the Liger JPS4 which run Ford Cyclone 385hp V6 engines in LMP type race cars weighing 920kg / 2024 lb. 

The versatile gearbox has a wide range of gear 35 gear ratios and to ensure there's a right ratio for every situation. In addtion there is a Quick change drop gear system (overall reduction) system to optimose the ratios for a given track. This 3MO NTV gearbox can handle 500 Nm / 370 lb-ft comfortably in endurance racing with standard materials, or 650 Nm / 480 lb-ft with upgraded materials

This Transaxle uses a TFJ Self Locking Differential with a 3 + 3 disc system and a range of ramp angles to suit customer needs. There are 3 inspection ports to allow for easy checking of the Dog Rings without disassembly of the gearbox saving time. 

 

APPLICATIONS

Circuit - Road Racing

FEATURES

Reliability - Wide Range of Ratios - Flexible Fitting - Quick Change Drop Gears

GEARBOX IN ACTION

 

SPECIFICATIONS

  • 6 Speed Sequential Transaxle Gearbox with straight cut and dog engaged gears 

  • Maximum engine torque 500 Nm / 370 lb-ft 

  • 89mm / 3.5" shaft centreline 

  • 20mm / 0.787" gear tooth width (1st to 3rd) & 17mm / 0.669" (4th to 6th)

  • Gear Ratio options 

        - 3 quick change constant drive ratios 
        - 35 gear ratios 

  • Step up conical drive (input) - transverse cluster layout

  • TFJ self locking differential  with 3 + 3 disc system and many ramp angles

    • Planet gear support cross

    • Bevel gear guided

    • Cluster removable 

    • Preload adjustment without disassembly

  • Input shaft length and spline to suit customer needs

  • Range of bellhouses for most of the popular engines 

  • Internal oil pump and lubrication system with steel filter

  • 3 Dog Ring inspection ports

  • 0-5V gear position sensor 

  • Lock out cable for reverse

  • Weight: 85kg / 187lb

RATIOS

 

Final Drive Ratios 

Gear Ratios

Gear Position

Teeth Ratio Teeth Ratio 1st 2nd 3rd 4th 5th 6th
 9 x 30 3.333 12 x 39 3.250          
9 x 34 3.778 12 x 37 3.083          
9 x 35 3.889 12 x 35 2.917          
    13 x 34 2.615          
    14 x 36 2.571        
    15 x 36 2.400        
    13 x 31 2.385        
    14 x 33 2.357        
    13 x 30 2.308        
    14 x 32 2.286        
    13 x 29 2.231        
    14 x 30 2.143        
    15 x 32 2.133        
    14 x 29 2.071        
    16 x 32 2.000        
    17 x 33 1.941        
    15 x 29 1.933        
    17 x 32 1.882        
    17 x 31 1.824        
    15 x 27 1.800        
    17 x 30 1.765        
    18 x 31 1.722        
    17 x 29 1.706        
    18 x 29 1.611        
    16 x 32 2.000      
    15 x 29 1.933      
    15 x 27 1.800      
    18 x 31 1.722      
    16 x 27 1.688      
    17 x 28 1.647      
    18 x 29 1.611      
    17 x 27 1.588      
    17 x 26 1.529      
    18 x 27 1.500      
    17 x 25 1.471      
    18 x 26 1.444      
    19 x 27 1.421      
    18 x 25 1.389      
    20 x 27 1.350      
    19 x 25 1.316      
    21 x 27 1.286      
    21 x26 1.238      
    22 x 27 1.227      
    19 x 23 1.211      
    21 x 25 1.190      
    20 x 23 1.150      
    23 x 26 1.130      
    20 x 22 1.100      
    21 x 23 1.095      
    28 x 30 1.071      
    28 x 29 1.036      
    23 x 23 1.000      
    25 x 24 0.960      
    32 x 30 0.938      
    23 x 19 0.826      

ACCESSORIES

Transaxle sequential gearbox accessories & parts

  • Bell Housings and Adaptor Plates
  • Gear Lever
  • Shift Cut Knob for Gear Lever
  • Paddle Shift Solutions
  • Breather Kit 
  • Programmable Gear Position Display
  • 52mm hydraulic clutch release bearing + feeder hoses 

NOTES

 

  • A minimum 0.7" master cylinder can be installed on your original clutch pedal setup.
  • An adjustable clutch pedal stop is needed as the hydraulic release bearing does not have an output stop.
  • An oil cooler is neede for endurane racing. A 13 row cooler measuring 210 x 98 x 50mm with AN6 inlet / outlet fittings will work well.
  • Motul HD 85W-140 Mineral or Motul 75W-140 Gear Comp Synthetic are the correct lubricants for this gearbox operating at 95-110°C or 203-230°F.
  • Oil Capacity is 3.5 litres / 3.6 quarts excluding lines and cooler