This section of the TTP X-Files is about tuning the Bonneville/T100 and Thruxton Triumph twins with bolt-on modifications. The Bonneville, T100 and Thruxton use the excellent 360° engine which is of course the traditional Triumph twin engine configuration. It outlines our experiences using different induction and exhaust configurations which are outlined below.
The initial dyno run was carried out on a factory standard 2010 EFI Bonneville with around 4200 miles on the clock and the SAI system was removed. The induction modifications used were the TTP Stage 1 Torque Induction Kit with and without the internal airbox baffle (stage 1.5) and the TTP Stage 2 Power Induction Kit. The exhaust silencers/system used were the Triumph Off Road Silencers (TORS), short free flowing silencers of less than 20"/50cm (not including link pipe), long free flowing silencers of more than 20"/50cm (not including link pipe) and a complete 2-1 system. All of the dyno graphs shown have the 'Factory OEM' run as a comparison.
Induction Comparison Dyno GraphsThe dyno's below compare each of the three induction systems with a specific exhaust system. This enables you to see what effect changing the induction has on your chosen exhaust.
Exhaust ModificationsFor our exhausts selection we chose TORS, long free flowing silencers, short free flowing silencers and a complete 2-1 system as these are representative of the most used exhausts by owners on the Bonneville/T100 and Thruxton. With silencers, if the exhaust note is louder, then generally they give better power at the top end and sometimes in the mid-range unless little thought has gone in to the silencer design.
Exhaust Comparison Dyno GraphsThe below dyno's compare each of the four exhaust systems with each of the three induction systems. This enables you to see what effect an exhaust has on a particular induction system.
EFI Bonneville/T100 & Thruxton Power & Torque Quick Reference Guide
The Best CombinationsAfter studying the dyno graphs and riding with the various induction and exhaust configurations there is one setup that we consider the outright winner, but this is based on the riding experience and not looks or sound of the exhaust system.
There are usually three points that draws you to an exhaust system for your bike,
Points 1 & 2 usually dominate because they are down to personal taste and what fits with your bike's style. Point 3 is usually mute because the information generally isn't available. Twin Power now gives you the missing information, so you can now consider point 3 for your style of silencer/exhaust system in your decision. The power delivery/curve of the exhaust system can now be used to balance the other two points.
So, we are going to give the top three configurations based on the best torque/power curves and riding experience.
We hope this article will help you to be informed about the bolt on power mods available and may help to make your Bonneville, T100 or Thruxton right for you.
Keep the rubber side down & ride safely,
We have a guide on how to remove the internal airbox baffle HERE and our testing on air filters HERE determined which filters to use.
All text and dyno run graphics are copyright of Triumph Twin Power ©2008-