http://www.bimmerpost.com/forums/showthread.php?t=1286797

 

Report: BMW to supply Jaguar with Twin-Turbo V8s

 

Thanks Foosh. Couldn't get link to paste correctly from mobile

 

Now that is a very interesting development. I hope it's true, because I like it!

 

If they offer a 6 or 7 speed MT with the TT V8, I'm all for it. (probably won't happen).

 

Disappointing, as I supercharged engine handles and sounds better (to me).

 

Hmmm . . . speaking of the N63 TT V8, this is interesting in light of our frequent discussions of the F-Type battery mgmt software and the observations of many including myself about the low charging rates when monitored w/ voltmeter:

"As part of its EfficientDynamics push, BMW's cars are loaded with expensive systems to save fuel wherever possible. One of them, the smart-charging system, operates on the premise that you can increase fuel economy slightly by charging the battery only when coasting. Unfortunately, American drivers aren't coasters, we're cruisers, so the system was murdering batteries. BMW's solution was to throw money at the problem, replacing the batteries with Absorbent Glass Mat (AGM) units that can cope with deeper and more frequent discharge cycles."

Enginerdy: Why BMW's N63 twin-turbo V8 eats batteries

 

I would rather they bring back I6 (and keep MT option) for S. Leave TT V8 with a slush box (or CVT lol!) for SVR and such. They way we won't be even tempted to overspend.

 

And I thought the new SIB to replace the battery every 20k service in my wife's X535i (N55) was ridiculously short--but every 10k for the N63 seems crazy inefficient.

 

I am not shure I see the benefits here? Turbo vs twin turbo vs supercharger? More or less bp? better mpg (whats the point in these kind of cars)? lighter engins (a valid point, but could be done by other changes). If this is correct I am qurious to what the real gains are?

 

The current 3rd generation of the N63 TT V8 is producing 600 HP and nearly 600 ft lbs. of torque w/ no doubt better fuel economy and less weight.

https://en.wikipedia.org/wiki/BMW_N63

 

I am glad I have a 5L Supercharged V8

 

A good example of bandaiding a problem even when
a complete solution is attainable. That is, modifying
the software so that it suits the use case.

"Let's keep our engineering and fuel economy edge
... so what if the owner has to buy new batteries."

A sensible and laudable plan. /sarcasm.

 

What would be better would be an electric turbo - provides best characteristics of supercharging and turbocharging.

 

What is wrong with the current JLR 5.0 V8 power plant?

Is this solely to have a V8 with lower gas mileage to meet the future gas mileage obligations across the product line?

 

It's built in the Ford Bridgend Engine Plant and JLR's contract with Ford is going to expire soon. I guess there is some doubt about Ford supplying once the contract expires.

And Ford keeps putting up the price per engine in the meantime, so i've been told...

There are a few other things that JLR has to give up when the contract expires, the SDD diagnostic system is a big one (it's based on Ford IDS coding) so they've been developing their own software system in the meantime. I believe other software architectures are also having to be replaced, since they have Ford and Volvo origins.

 

Perhaps it won't be a problem, but it sounds a little scary for existing owners for if JLR loses access to the SDD diagnostic system.

 

They won't lose access to it, just that it won't be updated any more. The final version of SDD will be "frozen" with no further updates for new vehicles. The new diagnostic platform "Pathfinder" will cover new vehicles from MY17 onward, and a select few earlier models once it's up and running (those still under warranty would be my guess).

 

I haven't thought through this before but it seems to me like a supercharged engine with direct electric drive assist (ie electric engine drives wheels rather than the turbo) should yield better performance at lower fuel consumption?

2nd law of thermodynamics suggests that using electric power to drive wheels directly is more efficient than using it to drive air which then drives wheels. And direct drive assist could do really interesting things to tailor the torque and power curve to get really smooth curves, since electric drive can be pretty much instantaneously adjusted, particularly on torque.

 

Yes that would be good too. That's what cars like the porsche 918 do. However the electric turbo isn't that. It's a turbo that can be spooled by both electric power in a lightweight 48v battery as well as spoiled by exhaust gases. So it will have immediate response using electricity and no lag. It's a turbo which has the response of a supercharger but without the parasitic loss.