Saab 9-4x BioPower Concept

Last week some of our readers found a VIN-card for the 9-4X MY12. In that card there were some engines that differ from the current MY11 offer. that VIN card has to still be seen as non official or as a rumour until Saab or GM confirms that they will use those engines.

One of those engines was an Engine with the GM RPO code LFW.

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 Cadillac SRX.

See here.

Today while reading the Swiss catalogue of the 9-4x, in Europe the 9-4x will not come earlier than October and as MY12, the model naming made me think about that VIN-card.

In some European markets only the 9-4x Aero with the 2.8T engine of the 9-5 will be on sale, but in some others the 3.0i will also be available. This engine, if we have to believe the Swiss catalogue, will be E85 capable.

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Out of curiosity, what is the benefit of E85 other than lower cost? I assume the car will adjust settings if you have, say, 1/2 tank of E85 and fill with gas?

The closest gas station with E85 is ~100mi. from me, so it doesn’t really matter to me anyway.


You’ll see more horsepower with the previous engine when fueled up with E85. My understanding is that the current BioPower engine (the 2.0T in the 9-5) runs the same with either fuel. (and yes, a 50/50 mix of E85 and regular gas is no problem)

The smell when starting the engine is ‘interesting’ to say the least. ๐Ÿ™‚

mike saunders

Ahhhhhh….but the extra HP, if any, will be variable and based on the percentage of E85 in the tank and how the car is driven. ๐Ÿ˜‰

If you use E85 and drive the car hard enough to use the additional knock protection that E85 provides, the car will sense the desired demand and advance timing slightly to increase the power output.

If you’re just puttering around town, you won’t notice a difference.


you want a combustion that is as efficient as possible. E85 has an octane rating of about 104, is more knock resistant, but also burns slower. If you run on E85, you always have to advance timing more then on gasoline in order to get timing right. I also suspect that the injection timing will be different then on gasoline.


Not to be a debbie downer, but this isn’t really huge news…

Way back in January 2009 the engine was revealed to be E85 compatible. Saab has always intended to use this engine, sooooo I’m not really sure how this is anything we didn’t already know?

I still love you RedJ ๐Ÿ™‚

Steve C.

When Saab first came out with BioPower so engines could run on E0 to E85, the HP rating was higher for E85 fuel while the fuel mileage would be less than with pure gasoloine. At some point, other changes were made so that a BioPower offering would no longer be dual-speced. It would be rated for one HP figure for the range of fuel mixture used. Perhaps that’s a minimum HP spec and actual HP (or peak HP) might be higher depdning on fuel mixture.


The different HP ratings were a marketing tool. Responsable power….
At this stage, these engines are Euro5 homologated and official testing has been done on gasoline and E85. This makes consumption and CO2 more important.
By lowering the poweroutput on E85, consumption will improve resulting in lower CO2… and is very easy and cheap compared to other efforts to reduce CO2.

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