Some of our readers have found a VIN-card from GM for the 2012 Saab 9-4X.
The VIN-card has two interesting things from my point of view, first the model year list ends in 2015, second four different engines are listed, and one of them is a diesel.
Let’s start with the petrol engines:
LAU – ENGINE GAS, 6 CYL, 2.8L, SFI, DOHC, TURBO, HO
This is the well known 300HP from the 9-5 and will also be available on the MY 11 9-4X Aero.
LFW – ENGINE GAS, 6 CYL, 3.0L, SIDI, DOHC, VVT, E85 MAX, ALUM
The LFW is a flexible fuel version of the LF1, capable of running on E85, gasoline, or any mixture of the two. Output is identical to the LF1.
The LF1 is the known 265HP engine of the MY 11 Saab 9-4X or the Cadillaac SRX.
Those are the engines we already know, although the atmospheric engine is a renewed version of the current one being able to run on E85, although in the VIN-card it is stated that:
Engines listed as flexible fuel do not indicate the vehicle is equipped for flexible fuel.
LFX – ENGINE GAS, 6CYL, 3.6L, SIDI, DOHC, VVT, E85 MAX, ALUM
The LFX is an enhanced version of the LLT engine. Introduced in the 2012 Chevrolet Camaro LS, it is 20.5 pounds (9.3 kg) lighter than the LLT, due to a redesigned cylinder head and integrated exhaust manifold, and composite intake manifold. Other components like the fuel injectors, intake valves, and fuel pump have also been updated. Power and torque are up slightly from the LLT. The compression ratio is 11.5:1.
Wikipedia also says that the SRX application will have 300HP. It makes sense in the SRX to offer the 3.6 as a replacement of the 2.8 Turbo, but I don’t think it makes sense for Saab to offer two engines with the same power output, but this is only my opinion.
And now the diesel engine:
L4J – ENGINE DIESEL, 4 CYL, 2.0L, L4, DI, INTER CLR TWIN TURBO DOHC, FAM B/C, 138 KW
Those Lxx codes are the GM RPO-code
Since the 1970s, GM’s North American divisions have used three-digit RPO (Regular Production Option) codes to identify specific equipment on their various lines of vehicles. RPO codes relating to engines generally begin with an “L”; hence many GM engines have become commonly associated with a particular RPO code
It is impossible to find any kind of information on that RPO code, but I’ve found three snippets that make sense.
- In the factory in Kaiserslautern(Germany), the Diesel Fam B is build.
- In LinedIn you can find a guy called Bial Rathur, and this is what he writes in his CV.
- Also in LinkedIn you can find a second guy with interesting work experience.
The Diesel engines for the 9-3 and 9-5 come from kaiserslautern, so they should be Fam B Diesels.
Bilal Rathur’s Experience
Lead Analysis Engineer, Powertrain
General Motors Corporation
Privately Held; MTLQQ; Automotive industry
June 2008 – Present (3 years)
Coordinating all simulation & analysis activities for current production Ecotec, VM Motori diesel, Duramax diesel, and US application of GM Europe’s Family-B diesel engines.
So this L4J is the US application of GM Europe’s Family-B diesel engines.
Michael Chiang’s Experience
Engine Systems Wave Analyst
November 2010 – Present (7 months)
Lead GT-Power Analyst
General Motors Company
January 2007 – October 2010 (3 years 10 months)
Lead GT-Power Analyst for NA Diesel Engines
• Engines: 2007 LMM, 2011/2015 LML/LGH, Duramax2, L4J, 2014 VM Motori LWH
The diesel engines used in the current 9-5 are the LBS (TiD 160HP) and the LBY (TTiD 190 HP).
Without having founded information on that engine I would say that the L4J is a NA version of the TTiD we can find in the European version of the Saab 9-5. Nevertheless it seem like it is loosing some power (2kW) due to the US application, but an added SCR catalyst could cause that.