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  • Linkage Installed
  • Closed Course Motorsport Fuel Rails
  • Closed Course Motorsport Linkage Kit
  • Closed Course Motorsport Vacuum Manifold Kit
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Triumph ITB Setup for 911 Aircooled Engines


Product Description

Complete ITB setup (Individual Throttle Body) for converting your aircooled 911 to fuel injection.

Manifold specs:
Sand cast aluminum manifolds with finish machining
38mm port at head
1/4NPT tapped bung for power brake vacuum connection (one side only)

Parts included:

(2) New cast aluminum manifolds
(6) New treated Paper Gasket ITB gaskets
(12) New stainless steel A-2, 6mm x 1.0mm x 30mm studs
(12) New 6mm x 1.0mm hex lock nuts nylon insert, Zinc plated class 8.8 steel
(12) New 6mm flat washers, Zinc plated steel
(1) New vacuum port plug
(1) New vacuum barb
(2) Used Triumph throttle body sets - good used condition, degreased but could use a good cleaning/painting.
(1) Used Triumph throttle position sensor
(1) New linkage setup - requires use of the stock CIS bellcrank
(2) New aluminum fuel rails - needs -6 AN o-ring boss adapters for fuel line tie in
(1) Vacuum manifold setup with hoses and fittings
(4) -6AN black fuel rail fittings

Parts not included but required for a complete setup:
(1) phenolic insulator/spacer kit
(1) Fuel lines with -6 AN female fittings
(1) Air filter or velocity stack setup
(1) Inline fuel filter
(1) Fuel pressure regulator
(1) EFI setup (Electronic Fuel Injection: Megasquirt, AEM Infinity, etc)


Closed Course Motorsport highly suggests Rasant Product's AEM Infinity setup or Al Kosmal's X-Faktory Megasquirt setup for the electronic fuel injection (EFI)


The Triumph ITBs are 42/43mm. And they will support a lot of HP.

The table below can be used to help estimate the correct size ITB

40mm 265cfm 61Hp 350-500 cc/cyl

42mm 304cfm 70Hp 450-600 cc/cyl

45mm 362cfm 83Hp 550-700 cc/cyl

48mm 408cfm 94Hp 650-800 cc/cyl

2.0 is (2000/6=333CC/cylinder) even 40mm is a bit too much.
2.7 is (2700/6=450CC/cylinder) high end of the 40mm, low end of 42mm
3.2 is (3200/6=533CC/cylinder) right in the center of 42mm
3.4 is (3400/6=566CC/cylinder) high end of the 42mm
3.6 is (3600/6=600cc/cylinder) time to move up to 46's

As you can see above this setup will fit an 2.7-3.4 911 engine. I have a smaller throttle body that is sized well for 2.0-2.4 engines as well.

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