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Originally Posted by OptionZero
I'm not a turbo expert by any stretch...
but isn't a TT set up more traditionally used on engines with a "V" setup...V6 such as the VG series, or the 3000GT (Gto)...or a Corvette....
The simple fact being you can put one turbo on each bank of cylinders
on the other hand, with an i4...you have alot more cramming to to get the twin turbos in a smaller space?
Are two turbos more efficient or less?
I imagine its also dead weight...
I understand that smaller turbos spool faster, so two small turbos will get boost faster than one big one tryin to make the same power...
What are other pro's and cons? aside from the simple fact that more turbos...more poarts...more$$$
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Finally someone who isnt knowledgable, but instead of pulling shit out their a$$, they actually ask questions instead. it seems alot of you could learn somthing from this guy....
to answer some of your questions
yes twin turbos are 'normally' reserved for V-engined cars. single creates a bit of a exhaust piping nightmare and TT CAN offer faster spool for these engines due to heat loss in the long manifold piping for the single car.
No, two turbos are not more efficient then a single turbo. simply due to the fact that larger turbos are more efficient then smaller ones.
The ONLY way you could POSSIBLY gain SOME advantage with a TT inline-engine car is with a sequential set-up. Direct 100% of exhaust flow to a single turbine at low RPM, spooling it up, then opening a valve that directs 50% of the exhaust flow when good boost/power is reached from the first to the other turbo (possibly a larger turbo).
Some problems I can think of with this
-tuning both engine mngment and exhaust valve timing...
-creating such a setup without excess backpressure
-piping nightmare
-more failure points
-still using two turbos likly less efficient than a single larger turbo.
-$$$$