HGT - Frequently asked questions

Answers to commonly asked questions


What are the prices for HGT Precision’s 6, 5 & 4 Speed sequential gearboxes?

The price of your solution depends on the options you require. Please click on www.hgtprecision.com/information-request to complete your unique requirements. We’ll have a quote in your hands within 24 hours (generally the same day)


What warranty does HGT provide?

We stand behind our products for any material or workmanship faults. However, given that our gearboxes are used in Race applications and we are unable to control the conditions that gearboxes will be used in; the frequency of maintenance, or driver shift technique…like the rest of the race industry, no warranty is offered or implied.


What are HGT’s final quality checks before the gearboxes are shipped?

Each gearbox has a unique identifier attached to the back plate. This unique code references build date, engineer who assembled the gearbox, gearbox model, batches of materials used and the gearbox version number.

1) A pressure leak down test is performed to ensure all seals are working correctly.

2) We run the gearbox on a bench dyno (with oil inside) checking all operations multiple times.

3) A short video clip is made of each gearbox going through shifts on the bench at medium rpm.

4) The build data, leak down test data and video recording are all stored electronically against your gearboxes unique identification number for future reference.

5) We perform a number of other high-tech checks as well , but given our competitors read our web site as well, we'd be naive to list them all here.


How long after I place my order will I receive my gearbox?

Generally speaking we will ship your gearbox within 3 weeks of receiving your written order and deposit – sometimes even faster!


What deposit is needed to confirm my order?

We request a $2,000 deposit with your written order as confirmation. On receipt of the same, we generate a delivery date for your planning purposes.


How do you ship your gearboxes and what does it cost?

We ship all gearboxes via Air Freight providing delivery to International airports usually within 72 hours. For most countries, we provide FREIGHT FREE shipping to your nearest International Airport. For our European customers, our pricing includes door to door delivery via UPS 


Who is the HGT Precision Dealer in my country?

We work on a Racer Direct business model in some countries, and a via Dealers in other coutries. Our website is updated as we add a new dealers.


How will I get my gearbox serviced locally?

HGT gearboxes are fully serviceable in the field with tools found in any good race or gearbox shop. To strip and reassemble a gearbox takes less than 1.5 hours. Your local HGT Dealer has all the tools to handle this with ease, as would any professional workshop.


How do I order spare parts and how long does it take for them to be delivered?

You can order by email www.hgtprecision.com/contact or by calling +64 21 155 0999. We keep stock of ALL parts and ship via DHL, FEDEX or UPS within 24 hours of receiving payment giving a 3-4 day global delivery time.


How long do your dogs last for?

The answer depends on your shift technique. A race driver with poor shifting skill, who abuses the box, could destroy the dogs in a couple of races. Good shifting technique however should see the dogs last between 4,000-5,000 race km. (2,500->3,125 race miles)


Are the gears in HGT Gearboxes an integral part of the main and lay shafts, or are they removable?

With the exception of 1st gear, all other gears are removable saving you money when it comes to replacing worn or damaged parts.


What is the recommended service frequency for HGT gearboxes?

1) Gearbox oil of 1.0->1.2 liters (depending on 4, 5 or 6 Speed) should be changed after every second weekend of racing.

2) At the end of each race season the gearbox should be removed, stripped with the gears, bearings and dogs checked for wear. Whilst stripped, the gears, main shaft and lay shaft should be crack tested. These are low cost tests and are the foundation of any good maintenance program on a racecar.

3) Any part found to be worn or cracked needs to be replaced.


Are HGT gearboxes capable of flat shifting?

All HGT gearboxes are capable of flat shifting with shift cut times as low as 38 milliseconds, however you do need to ensure your ECU is capable of handling closed loop flat shift. For differences between open and closed loop flat shift please click www.geartronics.co.uk/closedloop.htm We supply our own HGT Shift Cut Knob that not only fits on our own range of shoft levers, but is a generic fit for most other shoft levers in the Motorsport industy  


Do you have adaptor plates for different engines?

At HGT we elected to not make adaptor plates as they just introduce another variable. Instead we have custom-made bell houses to suit most RWD racecars. Our front plate is a GM Muncie bolt pattern. Our current bell house offerings are:

1) GM LS (OEM and Race)

2) Toyota 1JZ/2JZ/1UZ/3UZ

3) Nissan SR20/RB25/RB26/RB30/VQ35/VR38

4) Mazda Rotary (rear starter motor mount)

5) BMW Straight 6, V8, V10

6) Ford Coyote

7) Honda K20/K24 in RWD configuration

8) Others are being constantly developed – just ask if yours is not listed here.


Which input shafts do you offer?

We currently offer Toyota 14 spline (V160/V161/6MT), Toyota 21 spline (R154), GM 26 spline, Mazda 23 spline and Nissan 24 spline. If you have a different requirement just ask, as we appreciate each country will have different requirements.


Gearboxes with straight cut gears typically have a very loud whine. Are HGT gearboxes noisy too?

When it comes to noise and straight cut gears; at HGT we like to think of ourselves as myth busters. Yes our gears are straight cut for strength, but no they are not noisy. A happy customer came in from a circuit race and commented, “my oil pump is louder than your gearbox – I can’t believe how quiet these gearboxes are”. It’s all down the gear profiles we use, the evenness of loading on gear teeth due to our DIN5-6 finish, and the amount of backlash we design into the gear meshing.


Do I need to use an oil cooler with your gearbox?

Oil in the gearbox should be kept between 100 and 110 Degrees Celcius for optimum lubrication efficiency. If you are running the gearbox continuously for less than 15 minutes, then a cooler is generally not required. The Siemans VDO part #405 040001001 or Tilton part #40-524 Oil Pumps work well when combined with a high quality oil cooler. Its important to have the oil cooler located in a place with good airlflow .Your ECU should be programmed to automatically turn the oil pump on at 110 Degrees C and off at 100 Degrees C to control temperatures in the gearbox. All HGT Gearboxes come fitted with a Bosch temperature sensor ready to plug into your ECU.


Which oil should I use with HGT Gearboxes?

You must use 100% Synthetic purpose designed gear oil of 75W140 rating. We recommend Motul Gear Competition 75W140, Nismo Motul 75W140 Competition Oil 2189E, or Redline 75W140 Gear Oil. DO NOT use any brand of shockproof oil, as it does not flow well through the bearings due to the significant amount of additives these lubricants contain.


Can I use Paddle Shift with HGT Gearboxes?

HGT Gearboxes interface with both the Motec and Geartronics paddleshift systems with the simple addition of our custom made brackets


Do HGT gearboxes have a Speed Sensor built in?

All HGT gearboxes come equipped with a reluctor wheel built into the output flange at no additional cost. For those who need a speed sensor for running speed referenced boost, launch control, traction control or a speedometer, we supply an HGT custom bracket and Honeywell GT101 Sensor as accessories for a complete bolt up solution


How can I calculate what the right gear ratios are for my application?  

There are many free to use calculators on the web...we've found this one easy to use for calculating the maximum speed in each gear. You can enter different final drive ratios, wheel sizes, gear ratios and max rpm to calculate the top speed in each gear. Another useful calculator for RPM drop between gears is here