Twin Power TB39R bored & flowed throttle bodies
"breathe to the red line"
The TB39R's are OEM EFI throttle bodies re-engineered by TTP. Send us your throttle bodies, inlet rubbers and inlet manifolds and we'll return to you an induction system that has been bored and flow optimised to give just over 16% more air flow than the OEM system.

Throughout the re-engineering development of the TB39R induction system we used the Superflow 600 flowbench set at a vacuum of exactly 28" H²O to check our progress. A standard OEM throttle body, inlet rubber and manifold flows at 256cfm, after TTP have re-engineered the system this is increased to a healthy 298cfm. You don't need a dyno to prove this performance increase, it can be felt in the "seat of your pants".

This is how we optimize flow and performance of your OEM throttle bodies:

• Your throttle bodies are stripped down to their component parts and ultrasonically cleaned to remove any grime from the external surfaces.
• The bodies, manifolds and rubbers are bored out to 39mm, which gives an increase in cross sectional area of 17%.
• The bodies and manifolds are put through surface conditioning to help maximise air flow and fuel atomisation.
• The butterfly shaft is gas flowed to reduce restriction and increase air flow.
• Precision made butterflies are fitted, matched to the throttle bodies and secured in place.
• Finally the throttle bodies are maticulously rebuilt with the throttle position sensor electronically calibrated and the throttle butterflies manually balanced.

This service is available in two forms.

1. As a core exchange service where your bodies are exchanged for pre-modified bodies, all other parts are transfered over to the modified bodies. This service has a turnaround of approx. 7-10 days and your bodies must be in excellent condition.
2. As modification carried out to your own bodies. (i.e. your bodies aren't in immaculate condition or you want your own bodies modified) This service has a turnaround of approx. 21 days.
   
   **This is a performance modification and will void your Triumph warranty**

1. Remove your throttle bodies complete with inlet rubbers and manifolds from your bike. Do not dismantle the throttle bodies in any way, just send them to us as they come off the bike. Pack them up in a quality box with padding to protect them and then follow the shipping instructions on your TTP reciept.
   
   
2. Once delivered to us, you will receive an email confirming reciept.
   
   
3. Your bodies are then stripped down to their component parts and ultrasonically cleaned.
   
   
4. The bodies, manifolds and rubbers are bored, blended and surface conditioned to increase air flow. We use two surface finishes for the induction path. From the venturi to the butterfly the body is polished to maximise airflow and from the butterfly to the inlet manifold/cylinder head mating surface the body and manifold are given a matt finish to help with fuel atomisation.
   
   
5. The throttle shaft is gas flowed and new slightly thinner precision engineered butterflies are matched to the bodies and fixed in place. The fixing screws are then blended with the shaft. This work minimizes any flow impediments and maximizes air throughput to take full advantage of the larger bore bodies.
   
   
6. Once the engineering, flowing and finishing is complete, the final step is the meticulous re-build of the throttle body assembly, electronic calibration of the TPS and manual synchronization of the butterflies. (N.B. The manual synchronization of the butterflies is a good starting point and the bike will run well, but we recommend having your new bored & flowed throttle bodies balanced on the bike for optimum operation.)
   
   
7. Your modified throttle bodies are shipped back to you, well packed and ready to fit to your bike.