turbo questions

[cageceo]

Cool, lol, i didn't know that exactly. i had the concept that on sequential turbos went on one after another.

example.

turbo 1. engages at 2500Rpm
turbo 2. engages at 3500-4000 Rpm, and shuts off the first turbo.

so basically you always got turbo on almost a full power range. that's just what i had thought, but Glad to know the truth. seems alot more effcient the true way.

[pwpanas]

Originally Posted by cageceo

Cool, lol, i didn't know that exactly. i had the concept that on sequential turbos went on one after another.

example.

turbo 1. engages at 2500Rpm
turbo 2. engages at 3500-4000 Rpm, and shuts off the first turbo..

That'd be pretty weird. Why turn off the 1st turbo? What would be the benefit of that setup over a single turbo system? In other words, why would you think it was designed that way?

Originally Posted by cageceo

...so basically you always got turbo on almost a full power range. that's just what i had thought, but Glad to know the truth. seems alot more effcient the true way.

Yep the 1st turbo never turns off, except below about 2250rpms...

[cageceo]

from the word Squence, lol like i said it was just a thought. plus i guess to avoid extra heat, not sure but as i said the way you explained is a heck of alot more efficient, and makes more sense .

i guess another reason to get a TT over a NA supra huh.

is it true that when the turbos are off they some how improve milage on a car ??

check out this link to see what im Talking about

http://www.youtube.com/watch?v=4Y386YPVAFw

[JPDsupra]

I thought turbo made fule economy worse even when there off but they are considered "free power" cuz it doesnt use the engines power unlike superchargers cuz it works on air(partially). I saw a setup on a ustang with a twin supercharger though it looked impossible to recreate and it only made 600hp on pump gas( dont know if it was rwhp or just crank hp). I wish I had a pic but I saw it at a dragstrip.

[pwpanas]

Originally Posted by cageceo

...is it true that when the turbos are off they some how improve milage on a car ??

Not signifcantly, although there is probably a very minor effect from swirling the air more than an n/a engine (a la tornado).

Imo, the only related significant effect is the efficiency of running a relatively small displacement engine, which means that off-boost you get decent gas mileage (unlike a big block v8, for example)...so you get the benefits of a smaller displacement engine, and the power of a larger displacement engine at the same time.

P.S. The focus of Sam Mahdavi's interview was promoting the benefits of turbocharging, which I wholeheartedly agree with!