Spinners Automotive are the proud distributors of GIAC Performance Tuning. 

GIAC is a software engineering company with 17 years experience tuning cars.GIAC are known for creating "factory smooth" performance software with exceptional power and reliability. GIAC software replaces the standard software in your car’s engine control unit. It is programmed to adjust ignition timing, fuel delivery, fuel metering, boost settings, rev limiters, and/or speed limiters to optimise performance and, in some applications, fuel economy. Performance-tuned programs are designed to dramatically increase torque and HP without sacrificing smooth drivability. Many programs are also created to accommodate numerous after market performance modifications.

GIAC are focused on designing aftermarket software for Porsche®, Audi®, Bentley® and VW® cars but also has a long history of tuning BMW®, Volvo®, Mercedes® and many other European makes on a case-by-case basis.

Check out the GIAC website to see if your vehicle is able to be performanced tuned

Check out the link for golfr 1/4 mile times

see this tunit in 3D »

What is a Tunit?

The Tunit is an externally installed performance product suitable for all modern diesel engines. Tunit is designed to improve power, torque and efficiency, without compromising fuel economy. In most cases applications will achieve a 7-10% saving on fuel. It is retro-fit and will not interfere with original equipment or the manufacturers warranties. Installation is usually a swift process of less than 30 minutes. Thanks to Tunit, diesel tuning is possible to increase the performance of all modern diesel vehicles by up to 30%.

You may appreciate your diesel vehicle for its fuel economy, but you find it a little lacking in power! Or maybe you just want that bit of extra get up and go. The Tunit has the solution! This innovative and clever device provides a substantial increase in power and torque for the amateur or serious performance user.

The Tunit I is extremely compact in size and weight. Updated in January 2005 to a faster digital processor. The two variants of it are interchangeable with many other vehicles. The Tunit I fits VW, Audi, Seat, Skoda and more. This Tunit like all models is quite unique in it's ability to be easily adjusted to each individual vehicle. Fitting is usually carried out in 10-15 minutes, and adjustment is easily accessible although comes pre set like all models. Manual adjustment is via a 9 position rotary switch; right for more power, left for less. Like most of our products the Tunit I is designed to be fit and adjusted by the average, every day person. Fitting is also available at our distributors.

Tunit II

The Tunit II is extremely flexible, it will fit almost any vehicle prior to common rail engines and although it does not come with matching manufacturers plugs its great strength is that it can be used on almost any Tdi or non Tdi engine other than the latest common rail type engines.

This Tunit is also easily adjustable giving greater flexibility when it comes to customizing it to most engines and applications. As well as all this, the Tunit is an incredible 48x35 mm in size and as light as a pebble.

Fitting is by the attachment of four (in some cases six) wires. These can be done via the spade clips provided or by soldering. Adjustment is via a small screw on the body right for more power, left for less. Fitting is also available at our distributors.

Tunit III

This Tunit III is also very compact, a little smaller than a credit card. It has matching original manufacturers plugs on either end for ease of fitting. The Tunit III is adjustable via a small screw, giving it the same unique flexibility to individually tune your engine as its brothers. Right for more power left for less. This Tunit fits early models of BMW's, Vauxhall Omegas, Range Rover and Renaults. Fitting is also available at our distributors.

Tunit IV

Tunit IV is used on some older semi electronic pumps, such as those fitted on Peugeot / Citroen 2.1 TD and Ford Transit. An old Tunit now but still very effective, it is attached by seven fine wires in parallel to existing wires leading to the ECU. These wires must be soldered and so fitting is recommended at an official Tunit distributor. This Tunit is also adjusted like II & III with one small screw; right for more power, left for less.

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Tunit V-CR

This Tunit V-CR is extremely compact - around the size of a mobile phone. It features a harness with original plugs for ease of fitting and adjustable tuning, either manually with a 9 position rotary switch or electronically via lap top tuning. This Tunit has several variants and is easily adaptable to many other common rail vehicles. Fitting in under twenty minutes on most vehicles. Fitting is also available at our distributors.

Tunit V-VP

The Tunit V-VP is suited to all engines with variable pumps. These are mostly the Japanese engines up to 2001, although some manufacturers still prefer this injection system. The Tunit comes complete with a detachable harness and either a connection to fit to the ECU or wires that attach to your existing wiring harness. These Tunits come already set and also like all have the facility to be adjusted via a nine position rotary switch. Installation takes from 20 minutes to 1 hour and can be carried out by a competent DIY enthusiast. Fitting is also available at our distributors throughout the country.

Tunit V-PD

This Tunit suits all PD or single unit injection systems. This Tunit is suited to all the VW and Audi PD engines. It comes complete with original manufacturers plugs and is easily fit in under 20 minutes. Once fit, it is unobtrusive and original in appearance. The power and torque gains are more than impressive, giving incredible performance. Another great benefit is the Tunit V-PD is transferable to any other PD engine including the three cylinder! Please Note: Our application for the V10 VW Touareg uses Two Tunits.

Tunit V-PD (landrover TD5)

This V-PD Tunit is suited specifically to the Landrover TD 5 engine and comes with a harness that attaches in parallel to existing wiring. This Tunit is again compact in size and easily fit. Power and torque gains are very impressive on this type of injection system. Further increases can be achieved by lap top tuning.

Tunit C-11 and C-20

More pulling power! Cut fuel costs! Commercial diesel tuning with Tunit not only increases power by 20% but also more importantly saves fuel. This is achieved by the increase in torque allowing more efficient gear changing. (shorter gear range changes - less gear changes). The Tunit comes in a tough aluminium box and is adjustable via a small screw. Fitting is very simple.