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Introduction
The Drenth Gearbox 450 (DG450) 6-speed sequential racing gearbox is designed to be used in motorsport. Due to its compact design it fits into nearly any
rear wheel driven car. The DG450 is based on the DG400 gearbox that has been successful in different race events like: 24hr Nürburgring, 24 hr Zolder,
Belcar, 24 hr Dubai, Dutch SuperCars, VEGE Series, Hill climb’s, rally’s, Dakar and rally-cross. The gearbox is equipped with an integral lubrication system with oil pump and oilspraybar. The DG450 can handle torque levels up to 450 Nm and is equipped with a dropgear for quick ratio change.
This document contains information about the DG450 gearbox. It includes technical specifications, gear ratio set list and possible options. For more detailed
information please contact Drenth Gearboxes.
Drenth Motorsport Gearboxes Fleuweweg 10 7468 AG Enter The Netherlands Phone: +31 (0)547 38 26 96
Fax: +31 (0)547 38 20 65 Last modified: June 2013 [email protected] Made by Maarten Gerritzen www.drenth-gearboxes.com
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Figure 1: Rear and side view
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Technical Specifications
General Dimensions
Gearbox: 6-speed sequential Teeth profile: Straight-cut
Dry weight: t.b.a Max torque: 450 Nm* Oil type: Castrol Syntrax Limited slip 75W 140
* Depends on gear-ratio and car weight Figure 2: General dimensions
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Cross-Section
Figure 3: Cross-section
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Oil level and placement temperature sensor
Figure 4:
Oil level
Figure 5:
Placement oil sensor
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Gear Ratio List
Available gear ratios
Dropgears 1st gear 2nd, 3th, 4th, 5th, 6th gear
0.769 / 1.300 2.500 1.933 1.556 1.182 1.000
0.800 / 1.250 2.286 1.875 1.474 1.136 0.960
0.827 / 1.208 1.824 1.412 1.107 0.923
0.846 / 1.182 1.765 1.350 1.091 0.889
0.880 / 1.136 1.722 1.300 1.042 0.857
0.917 / 1.091 1.667 1.250 0.828
0.960 / 1.042 1.611
1.000
The drop gears come in pairs of two. Both gears can be fitted on either the drive shaft or the lay shaft, thus one pair of drop gears makes
two (inverted) ratios available.
Different gear ratios available on request.
Ratio requests from customers will be added to the list.
In consultation with the customer the ideal ratios can be calculated.
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Options
Gearlever
There are 2 types gearlevers with different lengths available to suit the drivers need.
For the dimensions see figure 6.
The shifting rod is available in different lengths to suit car specifications. For the
position of the gearlever.
o 37.02.0354 = 130 mm
o 37.02.0494 = 160 mm o 37.02.0495 = 180 mm
o 37.02.0370 = 200 mm
o 37.02.0369 = 240 mm o 37.02.0364 = 300 mm
o 37.02.0590 = 360 mm
There are 3 different studs available for shift length adjustment.
o Short stud: 37.02.0610 (used with a short gearlever)
o Intermediate stud: 37.02.0613 (used in combination with the gearbox
mount and a long gearlever) o Long stud: 37.02.0612 (used in combination with the tunnel mount and a long gearlever)
Figure 6: Available gearlevers
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D.M.S. Gearlever
The Strain Gauge Gearlever is specially designed to be used for flat shifting. A strain gauge is an accurate instrument to cut down the engine at the right moment, for a smooth gear change. Due its design it can be used in all types of cars
with a sequential gearbox. The gearlever has an analogue output. If the mounted ECU is able to use the analogue
input for flat shifting, then the gearlever can be connected directly to the ECU. A digital output can be added with the interface option. This digital output can be connected to the Drenth display unit.
Figure 5: D.M.S. gearlever
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Gearlever mounting
There are two possible constructions for
mounting the gearlever.
o A frame (gearbox mount) that’s bolded directly
on the gearbox.
o A tunnel mount, gives more freedom in the decision of the mounting position. There is a steel and an aluminium version
available.
Figure 7: Gearbox & tunnel mounts
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Gearbox Fit
Bell housing for the BMW S54 Engine (also suitable for BMW S50/S52): 37.03.0003.
Bell housing for the BMW S65 Engine: 37.07.0610.
Bell housing for the Honda S2000 Engine: 37.03.0046
Bell housing for the Ford Duratec Engine: 37.03.0007
Bell housing for the Toyota X86 Engine: 37.12.0020
Development of several adaptor plates to fit any engine application.
The given example is for a Mazda application.
Figure 8:
Bell housing and adaptor plate
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Drenth Display Unit The display unit houses several functions to adjust to the driver’s needs and to fine-tune the gearbox.
The gear indicator displays the selected gear by measuring the position of
the selector barrel with a rotary sensor. This function can be calibrated through the supplied software. It also can be used as a shift light when a
preset level of RPM is reached. This preset level and the manner of indicating
can be set with the supplied software.
The gear indicator, combined with the D.M.S gearlever, can act as a flatshift system (powershift) This means that you can accelerate (full throttle) and
shift up without using the clutch or lifting the throttle. This can also be
calibrated with the supplied software.
The set comes with a separate user manual. For more information contact our sales department or visit our website.
Figure 9:
Display unit
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Drenth Gear Indicator
The Drenth Gear indicator is a display unit that can be used with any Drenth gearbox with a rotary sensor. Any gear order can be accommodated with up to 7 forward speeds besides neutral and reverse.
Programming the unit is achieved by the use of a single button and a user-friendly programming routine. Additionally, the unit features a counter to log the total number
of gearshifts made – useful for tracking the life of critical gearbox components.
The set comes with a separate user manual. For more information contact our sales
department or visit our website.
Figure 10:
Gear indicator
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Paddle shift systems
Several aftermarket paddle shift systems are available for the DG450 sequential gearbox. Drenth offers gearlevers and mounting brackets which are fitted to shift cylinders supplied by Geartronics and KMP Paddleshifts (example shown in Figure 11).
Figure 11:
KMP paddle shift assembly
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Contact Information
Address
Drenth Motorsport Gearboxes Fleuweweg 10
7468 AG Enter
The Netherlands Phone: +31 (0)547 38 26 96
Fax: +31 (0)547 38 20 65 www.drenth-gearboxes.com
Contact Persons
Sales department:
Johan Drenth
Engineering:
Jeroen Grolleman
Drenth motorsport Gearboxes ©
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