CIS to EFI conversions
Although we have been Factory Bosch trained on CIS (Continuous Injection System) fuel injection systems, and have a great understanding of them, and have been repairing these systems for over 28 years, EFI is the way to go!
CIS systems are very crude, complex, and heavy, and are also prone to fuel contamination. The CIS components are also very expensive and hard to find now that they are over 36 years old.
Bring us your CIS injected 911 or 930. We will remove your complete CIS system, and install a fully lap top programmable EFI system.
There are a few ways to go with intake manifolds and if you want to retain single plug ignition, or go with twin plug. We can use your stock intake manifold (works fine, but is restrictive), locate and install a 1984 through 1988 911 Carrera manifold (works great and flow is good), or install one of our custom extruded aluminum intake manifolds (best and super high flow).
Stock 930 heads have 32mm intake ports. This is to create more port velocity necessary for the stock CIS sensor plate in the fuel distributor housing to work correctly. The stock intake manifold is port matched to the intake ports of the heads, and are also 32mm. This size port is good to around 450HP.
The next best way to go is to use an intake manifold from a 1984 through 1988 911 Carrera. It is however more expensive and requires some plumbing modification, and custom intercooler. When we use the Carrera manifold we also remove the 930 cylinder heads and enlarge the intake ports to 40mm from 32mm, and the exhaust ports to 37mm from the stock 35mm. We can now do this as we are not relying on the high port velocity as with the CIS system. EFI uses a small 3"x1.25"x0.50" MAP sensor to determine load. This small 1 OZ. part replaces the massive 15 pound CIS sensor plate housing and fuel distributor!
While we have the heads out and apart, we perform the twin plug modification to them. With the correct turbocharger, intercooler, cams, injectors, exhaust, and tuning, this setup will give you up to 650HP but cost $8,000.00 over our basic EFI conversion cost.
If you want more power - we can build a custom billet aluminum intake with dual plenum chambers which can flow enough air to support over 900 HP. This intake manifold alone cost $3,600.00
To get this kind of power we would need to completely rebuild your engine as a purpose-built race engine, and install many high performance race components such as Carrillo rods, 3.8 liter CMW pistons and cylinders, CMW race heads with twin plug, custom headers, twin Garrett / TiAL turbochargers, CMW race cams, etc. Depending on what we do, these engines range from $30,000.00 to 60,000.00.
Let us know what your budget is, and we will write you an estimate that you can compare with other shops.
Price Example:
Basic 1987 930 EFI Conversion $8,600.00
Includes:
All labor to remove CIS and install EFI
Six Billet aluminum intake riser injector blocks
Two Extruded aluminum EFI fuel rails
Electromotive TEC IIIr ECU
Electromotive DFU coil packs
Custom terminated ECU engine harness
Six RC Racing blue printed fuel injectors (55# good to 500HP)
3 BAR MAP sensor
0 - 5V TPS
IAT sensor
CLT sensor (cylinder head temp. sensor)
Trigger wheel to be used with or without A/C
Idle air valve
Pick-up sensor mount
Pick-up sensor
Aluminum distributor plug-off
TiAL blow-off valve
Spark plug wire set
Spark plugs
Wide band system with digital gauge (We run this in closed loop to 3,000 RPM for perfect fuel mixture)
Stainless braided fuel hoses with Earl's Swivel Seal TM hose ends
3 BAR fuel pressure regulator
SAMCO boots, couplings, fittings to re-plumb engine and intercooler
High flow K&N cone air filter
Tune engine on Dynamometer
above: 930 CIS intake manifold with CIS components
above: 930 CIS manifold with all of the CIS components removed.
We use this manifold with the basic EFI conversion. As you can see, it is much more simplistic than CIS!