I'm not sure if this was previously posted or not, so I'll ask anyway.

What's the benefits of direct injection? Just fuel mileage right? Or is it also a power increase? I want to decide if I'll be waiting until 2011 or 2012 for my new toy.

 

The simple answer to your question is yes.

The longer more detailed answer can be found at the link below:

http://en.wikipedia.org/wiki/Gasoline_direct_injection

 

I would say that it's worth waiting for. I heard that the new 5.0 liter V8 in the 2011 Mustang will have it, but others have said that it won't at first. In any event it is supposed to give the 5.0 liter engine 400 HP, with slightly better gas mileage then the 4.6 liter V8 that is in the Mustang now.

 

I'll believe it when I see it. In physics, there's no free lunch, and I don't believe that DI is capable of countervailing the negative fuel economy effects of adding an additional 100 HP.

 

The new engine also has 4 valves per cylinder, and a larger displacement. So perhaps with all that it could give us an extra hundred HP, while offering the same or better MPG. In other words it's a whole new engine, not just direct injection.

Here's a tread on it.

http://forums.bradbarnett.net/showth...ight=5.0+liter

 

DI should be worth 10-15% more power as well, the new Porsche 997S has 385hp vs. the 355hp of the year before. Same displacement at 3.8L. From what I have been hearing the 5.0L DI motor will make 15% more power than the 5.0L 4V motor from 2011, can't say anymore than that..sworn to secrecy.

Dave

 

I'll wait for it, it should spruce up fords line up

 

Lots of info in that link.

Just by adding DI by itself doesn't equate to more power. The cooler intake temps as a result of DI, allow the manufacture to increase compression and timing, thus increasing power.

 

Hopefully by then, Ford will fix the hideous tacked-on/tacky looking black plastic on the front and rear fascias.

 

Can direct injection be installed aftermarket? Or is it so much work that there's no point in doing it if you can just wait another year for it installed from factory?

 

Anythings possible. But it won't be worth it.

Other than a whole new computer system and a slew of sensors, you'd have to change the location of the fuel injector as well.

Here's a DI setup.
http://www.autoblog.com/2008/01/06/d...ect-injection/

And just by adding it you won't gain much besides better fuel economy. You'd have to also change the pistons to get the full benefits.

 

I don't think the 2011 Mustang's 5.0L will have Direct Injection. DI will be reserved for the NEW Mustang, IMO.

That said, though, I don't think the engine itself would provide much, if any, benefits in fuel economy. That would come via 6-speed transmissions.

 

A 6-speed wouldn't help all that much for city driving though, mainly just highway. I'd love for the 2011 to hit 20mpg city, isn't that what the GTO gets with a larger and more powerful engine?

 

The heads would be completely different and to get the full benefit of DI you would also want to go with higher compression. The benefits of DI is a cooler intake charge therefore allowing a higher compression ratio with the same octane of fuel. This is where a lot of the power increase is coming form.

Dave

 

Which leads me to believe the 5.0 has DI. It has been reported from insiders the CR is 11.5

 

I'm hoping it wil have DI too! After all the V6 Camero coming out has DI. Why shouldn't the 2011 5.0 liter V8 have it?

 

Actually 11.5:1 is not really that high for a car without DI. The new 997.2 Porsche with it's DI is running 12.8:1 compression. I know I'm talking PCar's here but with DI the compression ratio could go higher. According to the few reputable people I talked to the 2011 will not have DI. Most the power increase is going to be done via VCT. I hope they are wrong as the 2011 Stang with it's 5.0L 4V motor has me drooling.

 

The 5.0 will have you drilling without DI
and eventually with DI...