At GTT all our designs HAVE to exceed in all areas, if we cannot improve on what is currently available we will not produce it. Suffice to say that doesn't happen too often, if it does, we will offer that product! Therefore any 'non-GTT brand' product that we sell, we have high praise for indeed .Brands such as Quaife Porsche & Bilstein for example.
Of course there are many new & unique products to be found in this section as well. The other criteria is price. In many instances, not only will you receive a better product, but at a lower price at the same time. One reason we can achieve this is because we design & manufacture; there is no middle man.
NOTES; The products in this section are for Cooper S. In some instances the same product (or similar) is suitable for Mini One and/or Cooper. Please ask first if you are intending ordering for either of these vehicles. All prices unless stated otherwise are for the part(s) only. For fitted prices of individual items, please telephone, contact details at the bottom of the page.
GTT ECU RE-MAP
All GTT conversions include a re-flash to the ecu (optimised to the other components of each conversion) via the OBD2 port. This includes improvements to fueling maps, ignition maps, traction control maps (smoother intervention) and where requested, slightly increased rev limit. All maps have been extensively tested and proven world wide, since 2002.Similar maps are also used by other companies charging up to 4 times as much!
Please note we only use the latest versions available, which are continually being improved. All GTT maps are biased to provide good reliability safety margins. We do not run excessive lean mixtures or crazy rpm's just to achieve the last 5 bhp at the expense of long term reliability. Our extensive test programmes include the use of on board Wide-Band super accurate O2 sensors and knock meters to ensure correct fueling /ignition timing under all real world conditions. All our products have received much race track, drag strip and rolling road testing too!
Worth noting is that our re-flash is invisible to the BMW dealers scan tool, we will also keep a copy of your file so in the event it were ever overwritten we can always reload it for you. We do not charge for this normally. We recommend the use of 97 or 98 octane petrol though 95 octane (regular unleaded) can be used.
£299+vat.
GTT IRIDIUM SPARKPLUGS
These are fitted to all GTT conversions. Although expensive for us to purchase they do provide the last word in sparkplug performance, and are vastly superior to the std. '4 earth electrode' items, improving both performance and economy.
The Iridium tip not only has a much higher melting point than any other sparkplug tip material, but is considerably harder at the same time.
This gives very good service life. In most cases we increase the heat range over stantard. This is important in preventing detonation from a glowing plug (an engine killer) under extreme load and temperatures. Incidently we choose NGK over Denso purely due to even longer life.
£39+vat (set of 4)
GTT SUPERCHARGER PULLEY
The GTT S/C pulley is featured in all GTT conversions (except GTT190) , and is responsible for supplying the additional boost, that provides much of the power increase in all Cooper S performance conversions (JCW included ! ).
MATERIAL GTT use high quality carbon steel, this has many advantages over aluminium/duralium etc. Even though it is more costly to manufacture due to the slower machining feed rates. Firstly the Superchargers drive shaft is produced in steel therefore only steel pulleys will expand at the same rate ensuring the grip on the shaft is maintained at high temps and rpm.
Also steel is considerably harder wearing than duralium/alumimium etc, ensuring our pulleys last the distance. Small amounts of wear on the pulley will greatly increase the risk of power robbing belt slip, remember the S/C requires considerable force to turn it! The OE pulley is manufactured from steel and finished in black paint. The GTT item is also finished in black epoxy with the added benefit that its discrete 'similar to OE' appearance does not draw the unwanted attention that a bright silver pulley will, or even worse one with a ring of bolts around it!.
FIXING METHOD The original pulley is an interference fit on the shaft. GTT too has adopted this method. This has considerably less risk of coming loose than the tapered bore types which rely on a ring of small bolts to supply clamping pressure to a collet. One area worth mentioning is the removal of the OE pulley.
GTT use their own purpose designed tooling to remove it with no risk whatsoever of supercharger damage. Even the OE pulley itself comes off 100% in tact. The GTT pulley uses a clever remove/refit system making it relatively easy to return to standard should you ever wish to. We return the original pulley to the customer after each conversion.
These are fitted to all GTT conversions. Although expensive for us to purchase they do provide the last word in sparkplug performance, and are vastly superior to the std. '4 earth electrode' items, improving both performance and economy.
The GTT S/C pulley is featured in all GTT conversions (except GTT190) , and is responsible for supplying the additional boost, that provides much of the power increase in all Cooper S performance conversions (JCW included ! ).
