Dysfnctnl85

I haven't read a lot about this on here so I thought I would bring it up...I'm watching the new Top Gear (from Sunday) and the first car they test is the new 5 series Diesel from BMW. The motor is equipped with 2 turbos, one for low end power, and then at a certain point it switches to the larger turbo.



My question is, why hasn't (or has it?) this been done for a normal gasoline engine? Would this not alleviate the unstreetablility of having one large single turbo?



Discuss.

inanimate_object

Yes and yes, I think the reason you haven't seen it done more is because it's probably a good bit more complicated.



Mark

Dysfnctnl85

[quote name='inanimate_object' date='Aug 1 2005, 06:49 PM']Yes and yes, I think the reason you haven't seen it done more is because it's probably a good bit more complicated.



Mark


[/quote]



Mazda was on the right track!

teknics

diesels also have turbos that i believe use "VVT" or variable vane technology, i think that is the name of it.



But basically there are solenoids inside a massive turbo that when closed make the turbo act like a small, fast spooling, decent power turbo, then once the revs get higher the solenoids sense this and open and make the turbo act its full size and make good power.



DIesel motors always get the newest turbo technology.



kevin.

Dysfnctnl85

[quote name='teknics' date='Aug 2 2005, 02:47 AM']diesels also have turbos that i believe use "VVT" or variable vane technology, i think that is the name of it.



But basically there are solenoids inside a massive turbo that when closed make the turbo act like a small, fast spooling, decent power turbo, then once the revs get higher the solenoids sense this and open and make the turbo act its full size and make good power.



DIesel motors always get the newest turbo technology.



kevin.


[/quote]



Yeah I think you and I have mentioned these before...



Maybe if F1 used forced induction we would have this technology in street cars by now...